2225 lines
56 KiB
C
2225 lines
56 KiB
C
/*
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* Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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* Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
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*
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* Authors:
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* Paul Mackerras <paulus@au1.ibm.com>
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* Alexander Graf <agraf@suse.de>
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* Kevin Wolf <mail@kevin-wolf.de>
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*
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* Description: KVM functions specific to running on Book 3S
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* processors in hypervisor mode (specifically POWER7 and later).
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*
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* This file is derived from arch/powerpc/kvm/book3s.c,
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* by Alexander Graf <agraf@suse.de>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*/
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#include <linux/kvm_host.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/preempt.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/fs.h>
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#include <linux/anon_inodes.h>
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#include <linux/cpumask.h>
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#include <linux/spinlock.h>
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#include <linux/page-flags.h>
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#include <linux/srcu.h>
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#include <asm/reg.h>
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#include <asm/cputable.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/kvm_ppc.h>
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#include <asm/kvm_book3s.h>
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#include <asm/mmu_context.h>
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#include <asm/lppaca.h>
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#include <asm/processor.h>
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#include <asm/cputhreads.h>
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#include <asm/page.h>
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#include <asm/hvcall.h>
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#include <asm/switch_to.h>
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#include <asm/smp.h>
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#include <linux/gfp.h>
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#include <linux/vmalloc.h>
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#include <linux/highmem.h>
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#include <linux/hugetlb.h>
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#include <linux/module.h>
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#include "book3s.h"
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/* #define EXIT_DEBUG */
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/* #define EXIT_DEBUG_SIMPLE */
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/* #define EXIT_DEBUG_INT */
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/* Used to indicate that a guest page fault needs to be handled */
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#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
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/* Used as a "null" value for timebase values */
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#define TB_NIL (~(u64)0)
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static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
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static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
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static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
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{
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int me;
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int cpu = vcpu->cpu;
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wait_queue_head_t *wqp;
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wqp = kvm_arch_vcpu_wq(vcpu);
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if (waitqueue_active(wqp)) {
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wake_up_interruptible(wqp);
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++vcpu->stat.halt_wakeup;
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}
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me = get_cpu();
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/* CPU points to the first thread of the core */
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if (cpu != me && cpu >= 0 && cpu < nr_cpu_ids) {
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int real_cpu = cpu + vcpu->arch.ptid;
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if (paca[real_cpu].kvm_hstate.xics_phys)
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xics_wake_cpu(real_cpu);
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else if (cpu_online(cpu))
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smp_send_reschedule(cpu);
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}
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put_cpu();
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}
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/*
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* We use the vcpu_load/put functions to measure stolen time.
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* Stolen time is counted as time when either the vcpu is able to
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* run as part of a virtual core, but the task running the vcore
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* is preempted or sleeping, or when the vcpu needs something done
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* in the kernel by the task running the vcpu, but that task is
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* preempted or sleeping. Those two things have to be counted
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* separately, since one of the vcpu tasks will take on the job
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* of running the core, and the other vcpu tasks in the vcore will
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* sleep waiting for it to do that, but that sleep shouldn't count
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* as stolen time.
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*
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* Hence we accumulate stolen time when the vcpu can run as part of
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* a vcore using vc->stolen_tb, and the stolen time when the vcpu
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* needs its task to do other things in the kernel (for example,
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* service a page fault) in busy_stolen. We don't accumulate
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* stolen time for a vcore when it is inactive, or for a vcpu
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* when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
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* a misnomer; it means that the vcpu task is not executing in
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* the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
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* the kernel. We don't have any way of dividing up that time
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* between time that the vcpu is genuinely stopped, time that
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* the task is actively working on behalf of the vcpu, and time
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* that the task is preempted, so we don't count any of it as
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* stolen.
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*
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* Updates to busy_stolen are protected by arch.tbacct_lock;
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* updates to vc->stolen_tb are protected by the arch.tbacct_lock
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* of the vcpu that has taken responsibility for running the vcore
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* (i.e. vc->runner). The stolen times are measured in units of
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* timebase ticks. (Note that the != TB_NIL checks below are
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* purely defensive; they should never fail.)
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*/
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static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
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{
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struct kvmppc_vcore *vc = vcpu->arch.vcore;
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unsigned long flags;
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spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
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if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE &&
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vc->preempt_tb != TB_NIL) {
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vc->stolen_tb += mftb() - vc->preempt_tb;
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vc->preempt_tb = TB_NIL;
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}
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if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
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vcpu->arch.busy_preempt != TB_NIL) {
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vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
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vcpu->arch.busy_preempt = TB_NIL;
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}
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spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
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}
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static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
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{
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struct kvmppc_vcore *vc = vcpu->arch.vcore;
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unsigned long flags;
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spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
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if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE)
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vc->preempt_tb = mftb();
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if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
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vcpu->arch.busy_preempt = mftb();
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spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
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}
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static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
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{
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vcpu->arch.shregs.msr = msr;
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kvmppc_end_cede(vcpu);
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}
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void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
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{
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vcpu->arch.pvr = pvr;
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}
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int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
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{
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unsigned long pcr = 0;
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struct kvmppc_vcore *vc = vcpu->arch.vcore;
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if (arch_compat) {
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if (!cpu_has_feature(CPU_FTR_ARCH_206))
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return -EINVAL; /* 970 has no compat mode support */
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switch (arch_compat) {
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case PVR_ARCH_205:
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pcr = PCR_ARCH_205;
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break;
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case PVR_ARCH_206:
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case PVR_ARCH_206p:
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break;
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default:
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return -EINVAL;
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}
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}
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spin_lock(&vc->lock);
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vc->arch_compat = arch_compat;
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vc->pcr = pcr;
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spin_unlock(&vc->lock);
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return 0;
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}
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void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
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{
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int r;
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pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
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pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
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vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
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for (r = 0; r < 16; ++r)
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pr_err("r%2d = %.16lx r%d = %.16lx\n",
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r, kvmppc_get_gpr(vcpu, r),
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r+16, kvmppc_get_gpr(vcpu, r+16));
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pr_err("ctr = %.16lx lr = %.16lx\n",
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vcpu->arch.ctr, vcpu->arch.lr);
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pr_err("srr0 = %.16llx srr1 = %.16llx\n",
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vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
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pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
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vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
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pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
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vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
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pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
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vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
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pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
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pr_err("fault dar = %.16lx dsisr = %.8x\n",
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vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
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pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
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for (r = 0; r < vcpu->arch.slb_max; ++r)
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pr_err(" ESID = %.16llx VSID = %.16llx\n",
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vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
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pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
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vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
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vcpu->arch.last_inst);
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}
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struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
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{
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int r;
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struct kvm_vcpu *v, *ret = NULL;
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mutex_lock(&kvm->lock);
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kvm_for_each_vcpu(r, v, kvm) {
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if (v->vcpu_id == id) {
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ret = v;
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break;
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}
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}
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mutex_unlock(&kvm->lock);
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return ret;
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}
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static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
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{
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vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
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vpa->yield_count = 1;
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}
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static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
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unsigned long addr, unsigned long len)
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{
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/* check address is cacheline aligned */
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if (addr & (L1_CACHE_BYTES - 1))
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return -EINVAL;
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spin_lock(&vcpu->arch.vpa_update_lock);
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if (v->next_gpa != addr || v->len != len) {
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v->next_gpa = addr;
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v->len = addr ? len : 0;
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v->update_pending = 1;
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}
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spin_unlock(&vcpu->arch.vpa_update_lock);
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return 0;
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}
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/* Length for a per-processor buffer is passed in at offset 4 in the buffer */
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struct reg_vpa {
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u32 dummy;
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union {
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u16 hword;
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u32 word;
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} length;
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};
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static int vpa_is_registered(struct kvmppc_vpa *vpap)
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{
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if (vpap->update_pending)
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return vpap->next_gpa != 0;
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return vpap->pinned_addr != NULL;
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}
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static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
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unsigned long flags,
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unsigned long vcpuid, unsigned long vpa)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long len, nb;
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void *va;
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struct kvm_vcpu *tvcpu;
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int err;
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int subfunc;
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struct kvmppc_vpa *vpap;
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tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
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if (!tvcpu)
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return H_PARAMETER;
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subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
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if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
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subfunc == H_VPA_REG_SLB) {
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/* Registering new area - address must be cache-line aligned */
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if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
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return H_PARAMETER;
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/* convert logical addr to kernel addr and read length */
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va = kvmppc_pin_guest_page(kvm, vpa, &nb);
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if (va == NULL)
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return H_PARAMETER;
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if (subfunc == H_VPA_REG_VPA)
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len = ((struct reg_vpa *)va)->length.hword;
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else
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len = ((struct reg_vpa *)va)->length.word;
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kvmppc_unpin_guest_page(kvm, va, vpa, false);
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/* Check length */
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if (len > nb || len < sizeof(struct reg_vpa))
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return H_PARAMETER;
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} else {
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vpa = 0;
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len = 0;
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}
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err = H_PARAMETER;
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vpap = NULL;
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spin_lock(&tvcpu->arch.vpa_update_lock);
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switch (subfunc) {
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case H_VPA_REG_VPA: /* register VPA */
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if (len < sizeof(struct lppaca))
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break;
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vpap = &tvcpu->arch.vpa;
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err = 0;
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break;
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case H_VPA_REG_DTL: /* register DTL */
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if (len < sizeof(struct dtl_entry))
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break;
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len -= len % sizeof(struct dtl_entry);
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/* Check that they have previously registered a VPA */
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err = H_RESOURCE;
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if (!vpa_is_registered(&tvcpu->arch.vpa))
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break;
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vpap = &tvcpu->arch.dtl;
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err = 0;
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break;
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case H_VPA_REG_SLB: /* register SLB shadow buffer */
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/* Check that they have previously registered a VPA */
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err = H_RESOURCE;
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if (!vpa_is_registered(&tvcpu->arch.vpa))
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break;
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vpap = &tvcpu->arch.slb_shadow;
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err = 0;
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break;
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case H_VPA_DEREG_VPA: /* deregister VPA */
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/* Check they don't still have a DTL or SLB buf registered */
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err = H_RESOURCE;
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if (vpa_is_registered(&tvcpu->arch.dtl) ||
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vpa_is_registered(&tvcpu->arch.slb_shadow))
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break;
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vpap = &tvcpu->arch.vpa;
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err = 0;
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break;
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case H_VPA_DEREG_DTL: /* deregister DTL */
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vpap = &tvcpu->arch.dtl;
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err = 0;
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break;
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case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
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vpap = &tvcpu->arch.slb_shadow;
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err = 0;
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break;
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}
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if (vpap) {
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vpap->next_gpa = vpa;
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vpap->len = len;
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vpap->update_pending = 1;
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}
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spin_unlock(&tvcpu->arch.vpa_update_lock);
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return err;
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}
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static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
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{
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struct kvm *kvm = vcpu->kvm;
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void *va;
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unsigned long nb;
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unsigned long gpa;
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/*
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* We need to pin the page pointed to by vpap->next_gpa,
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* but we can't call kvmppc_pin_guest_page under the lock
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* as it does get_user_pages() and down_read(). So we
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* have to drop the lock, pin the page, then get the lock
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* again and check that a new area didn't get registered
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* in the meantime.
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*/
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for (;;) {
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gpa = vpap->next_gpa;
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spin_unlock(&vcpu->arch.vpa_update_lock);
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va = NULL;
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nb = 0;
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if (gpa)
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va = kvmppc_pin_guest_page(kvm, gpa, &nb);
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spin_lock(&vcpu->arch.vpa_update_lock);
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if (gpa == vpap->next_gpa)
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break;
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/* sigh... unpin that one and try again */
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if (va)
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kvmppc_unpin_guest_page(kvm, va, gpa, false);
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}
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vpap->update_pending = 0;
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if (va && nb < vpap->len) {
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/*
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* If it's now too short, it must be that userspace
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* has changed the mappings underlying guest memory,
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* so unregister the region.
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*/
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kvmppc_unpin_guest_page(kvm, va, gpa, false);
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va = NULL;
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}
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if (vpap->pinned_addr)
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kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
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vpap->dirty);
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vpap->gpa = gpa;
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vpap->pinned_addr = va;
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vpap->dirty = false;
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if (va)
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vpap->pinned_end = va + vpap->len;
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}
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static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
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{
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if (!(vcpu->arch.vpa.update_pending ||
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vcpu->arch.slb_shadow.update_pending ||
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vcpu->arch.dtl.update_pending))
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return;
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spin_lock(&vcpu->arch.vpa_update_lock);
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if (vcpu->arch.vpa.update_pending) {
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kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
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if (vcpu->arch.vpa.pinned_addr)
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init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
|
|
}
|
|
if (vcpu->arch.dtl.update_pending) {
|
|
kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
|
|
vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
|
|
vcpu->arch.dtl_index = 0;
|
|
}
|
|
if (vcpu->arch.slb_shadow.update_pending)
|
|
kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
|
|
spin_unlock(&vcpu->arch.vpa_update_lock);
|
|
}
|
|
|
|
/*
|
|
* Return the accumulated stolen time for the vcore up until `now'.
|
|
* The caller should hold the vcore lock.
|
|
*/
|
|
static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
|
|
{
|
|
u64 p;
|
|
|
|
/*
|
|
* If we are the task running the vcore, then since we hold
|
|
* the vcore lock, we can't be preempted, so stolen_tb/preempt_tb
|
|
* can't be updated, so we don't need the tbacct_lock.
|
|
* If the vcore is inactive, it can't become active (since we
|
|
* hold the vcore lock), so the vcpu load/put functions won't
|
|
* update stolen_tb/preempt_tb, and we don't need tbacct_lock.
|
|
*/
|
|
if (vc->vcore_state != VCORE_INACTIVE &&
|
|
vc->runner->arch.run_task != current) {
|
|
spin_lock_irq(&vc->runner->arch.tbacct_lock);
|
|
p = vc->stolen_tb;
|
|
if (vc->preempt_tb != TB_NIL)
|
|
p += now - vc->preempt_tb;
|
|
spin_unlock_irq(&vc->runner->arch.tbacct_lock);
|
|
} else {
|
|
p = vc->stolen_tb;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
|
|
struct kvmppc_vcore *vc)
|
|
{
|
|
struct dtl_entry *dt;
|
|
struct lppaca *vpa;
|
|
unsigned long stolen;
|
|
unsigned long core_stolen;
|
|
u64 now;
|
|
|
|
dt = vcpu->arch.dtl_ptr;
|
|
vpa = vcpu->arch.vpa.pinned_addr;
|
|
now = mftb();
|
|
core_stolen = vcore_stolen_time(vc, now);
|
|
stolen = core_stolen - vcpu->arch.stolen_logged;
|
|
vcpu->arch.stolen_logged = core_stolen;
|
|
spin_lock_irq(&vcpu->arch.tbacct_lock);
|
|
stolen += vcpu->arch.busy_stolen;
|
|
vcpu->arch.busy_stolen = 0;
|
|
spin_unlock_irq(&vcpu->arch.tbacct_lock);
|
|
if (!dt || !vpa)
|
|
return;
|
|
memset(dt, 0, sizeof(struct dtl_entry));
|
|
dt->dispatch_reason = 7;
|
|
dt->processor_id = vc->pcpu + vcpu->arch.ptid;
|
|
dt->timebase = now + vc->tb_offset;
|
|
dt->enqueue_to_dispatch_time = stolen;
|
|
dt->srr0 = kvmppc_get_pc(vcpu);
|
|
dt->srr1 = vcpu->arch.shregs.msr;
|
|
++dt;
|
|
if (dt == vcpu->arch.dtl.pinned_end)
|
|
dt = vcpu->arch.dtl.pinned_addr;
|
|
vcpu->arch.dtl_ptr = dt;
|
|
/* order writing *dt vs. writing vpa->dtl_idx */
|
|
smp_wmb();
|
|
vpa->dtl_idx = ++vcpu->arch.dtl_index;
|
|
vcpu->arch.dtl.dirty = true;
|
|
}
|
|
|
|
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long req = kvmppc_get_gpr(vcpu, 3);
|
|
unsigned long target, ret = H_SUCCESS;
|
|
struct kvm_vcpu *tvcpu;
|
|
int idx, rc;
|
|
|
|
switch (req) {
|
|
case H_ENTER:
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
ret = kvmppc_virtmode_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
|
|
kvmppc_get_gpr(vcpu, 5),
|
|
kvmppc_get_gpr(vcpu, 6),
|
|
kvmppc_get_gpr(vcpu, 7));
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
break;
|
|
case H_CEDE:
|
|
break;
|
|
case H_PROD:
|
|
target = kvmppc_get_gpr(vcpu, 4);
|
|
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
|
|
if (!tvcpu) {
|
|
ret = H_PARAMETER;
|
|
break;
|
|
}
|
|
tvcpu->arch.prodded = 1;
|
|
smp_mb();
|
|
if (vcpu->arch.ceded) {
|
|
if (waitqueue_active(&vcpu->wq)) {
|
|
wake_up_interruptible(&vcpu->wq);
|
|
vcpu->stat.halt_wakeup++;
|
|
}
|
|
}
|
|
break;
|
|
case H_CONFER:
|
|
target = kvmppc_get_gpr(vcpu, 4);
|
|
if (target == -1)
|
|
break;
|
|
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
|
|
if (!tvcpu) {
|
|
ret = H_PARAMETER;
|
|
break;
|
|
}
|
|
kvm_vcpu_yield_to(tvcpu);
|
|
break;
|
|
case H_REGISTER_VPA:
|
|
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
|
|
kvmppc_get_gpr(vcpu, 5),
|
|
kvmppc_get_gpr(vcpu, 6));
|
|
break;
|
|
case H_RTAS:
|
|
if (list_empty(&vcpu->kvm->arch.rtas_tokens))
|
|
return RESUME_HOST;
|
|
|
|
idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
rc = kvmppc_rtas_hcall(vcpu);
|
|
srcu_read_unlock(&vcpu->kvm->srcu, idx);
|
|
|
|
if (rc == -ENOENT)
|
|
return RESUME_HOST;
|
|
else if (rc == 0)
|
|
break;
|
|
|
|
/* Send the error out to userspace via KVM_RUN */
|
|
return rc;
|
|
|
|
case H_XIRR:
|
|
case H_CPPR:
|
|
case H_EOI:
|
|
case H_IPI:
|
|
case H_IPOLL:
|
|
case H_XIRR_X:
|
|
if (kvmppc_xics_enabled(vcpu)) {
|
|
ret = kvmppc_xics_hcall(vcpu, req);
|
|
break;
|
|
} /* fallthrough */
|
|
default:
|
|
return RESUME_HOST;
|
|
}
|
|
kvmppc_set_gpr(vcpu, 3, ret);
|
|
vcpu->arch.hcall_needed = 0;
|
|
return RESUME_GUEST;
|
|
}
|
|
|
|
static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
|
|
struct task_struct *tsk)
|
|
{
|
|
int r = RESUME_HOST;
|
|
|
|
vcpu->stat.sum_exits++;
|
|
|
|
run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
run->ready_for_interrupt_injection = 1;
|
|
switch (vcpu->arch.trap) {
|
|
/* We're good on these - the host merely wanted to get our attention */
|
|
case BOOK3S_INTERRUPT_HV_DECREMENTER:
|
|
vcpu->stat.dec_exits++;
|
|
r = RESUME_GUEST;
|
|
break;
|
|
case BOOK3S_INTERRUPT_EXTERNAL:
|
|
vcpu->stat.ext_intr_exits++;
|
|
r = RESUME_GUEST;
|
|
break;
|
|
case BOOK3S_INTERRUPT_PERFMON:
|
|
r = RESUME_GUEST;
|
|
break;
|
|
case BOOK3S_INTERRUPT_MACHINE_CHECK:
|
|
/*
|
|
* Deliver a machine check interrupt to the guest.
|
|
* We have to do this, even if the host has handled the
|
|
* machine check, because machine checks use SRR0/1 and
|
|
* the interrupt might have trashed guest state in them.
|
|
*/
|
|
kvmppc_book3s_queue_irqprio(vcpu,
|
|
BOOK3S_INTERRUPT_MACHINE_CHECK);
|
|
r = RESUME_GUEST;
|
|
break;
|
|
case BOOK3S_INTERRUPT_PROGRAM:
|
|
{
|
|
ulong flags;
|
|
/*
|
|
* Normally program interrupts are delivered directly
|
|
* to the guest by the hardware, but we can get here
|
|
* as a result of a hypervisor emulation interrupt
|
|
* (e40) getting turned into a 700 by BML RTAS.
|
|
*/
|
|
flags = vcpu->arch.shregs.msr & 0x1f0000ull;
|
|
kvmppc_core_queue_program(vcpu, flags);
|
|
r = RESUME_GUEST;
|
|
break;
|
|
}
|
|
case BOOK3S_INTERRUPT_SYSCALL:
|
|
{
|
|
/* hcall - punt to userspace */
|
|
int i;
|
|
|
|
if (vcpu->arch.shregs.msr & MSR_PR) {
|
|
/* sc 1 from userspace - reflect to guest syscall */
|
|
kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
|
|
r = RESUME_GUEST;
|
|
break;
|
|
}
|
|
run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
|
|
for (i = 0; i < 9; ++i)
|
|
run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
|
|
run->exit_reason = KVM_EXIT_PAPR_HCALL;
|
|
vcpu->arch.hcall_needed = 1;
|
|
r = RESUME_HOST;
|
|
break;
|
|
}
|
|
/*
|
|
* We get these next two if the guest accesses a page which it thinks
|
|
* it has mapped but which is not actually present, either because
|
|
* it is for an emulated I/O device or because the corresonding
|
|
* host page has been paged out. Any other HDSI/HISI interrupts
|
|
* have been handled already.
|
|
*/
|
|
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
|
|
r = RESUME_PAGE_FAULT;
|
|
break;
|
|
case BOOK3S_INTERRUPT_H_INST_STORAGE:
|
|
vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
|
|
vcpu->arch.fault_dsisr = 0;
|
|
r = RESUME_PAGE_FAULT;
|
|
break;
|
|
/*
|
|
* This occurs if the guest executes an illegal instruction.
|
|
* We just generate a program interrupt to the guest, since
|
|
* we don't emulate any guest instructions at this stage.
|
|
*/
|
|
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
|
|
kvmppc_core_queue_program(vcpu, 0x80000);
|
|
r = RESUME_GUEST;
|
|
break;
|
|
default:
|
|
kvmppc_dump_regs(vcpu);
|
|
printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
|
|
vcpu->arch.trap, kvmppc_get_pc(vcpu),
|
|
vcpu->arch.shregs.msr);
|
|
run->hw.hardware_exit_reason = vcpu->arch.trap;
|
|
r = RESUME_HOST;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
|
|
struct kvm_sregs *sregs)
|
|
{
|
|
int i;
|
|
|
|
memset(sregs, 0, sizeof(struct kvm_sregs));
|
|
sregs->pvr = vcpu->arch.pvr;
|
|
for (i = 0; i < vcpu->arch.slb_max; i++) {
|
|
sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
|
|
sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
|
|
struct kvm_sregs *sregs)
|
|
{
|
|
int i, j;
|
|
|
|
kvmppc_set_pvr_hv(vcpu, sregs->pvr);
|
|
|
|
j = 0;
|
|
for (i = 0; i < vcpu->arch.slb_nr; i++) {
|
|
if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
|
|
vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
|
|
vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
|
|
++j;
|
|
}
|
|
}
|
|
vcpu->arch.slb_max = j;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr)
|
|
{
|
|
struct kvmppc_vcore *vc = vcpu->arch.vcore;
|
|
u64 mask;
|
|
|
|
spin_lock(&vc->lock);
|
|
/*
|
|
* Userspace can only modify DPFD (default prefetch depth),
|
|
* ILE (interrupt little-endian) and TC (translation control).
|
|
*/
|
|
mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
|
|
vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
|
|
spin_unlock(&vc->lock);
|
|
}
|
|
|
|
static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
|
|
union kvmppc_one_reg *val)
|
|
{
|
|
int r = 0;
|
|
long int i;
|
|
|
|
switch (id) {
|
|
case KVM_REG_PPC_HIOR:
|
|
*val = get_reg_val(id, 0);
|
|
break;
|
|
case KVM_REG_PPC_DABR:
|
|
*val = get_reg_val(id, vcpu->arch.dabr);
|
|
break;
|
|
case KVM_REG_PPC_DSCR:
|
|
*val = get_reg_val(id, vcpu->arch.dscr);
|
|
break;
|
|
case KVM_REG_PPC_PURR:
|
|
*val = get_reg_val(id, vcpu->arch.purr);
|
|
break;
|
|
case KVM_REG_PPC_SPURR:
|
|
*val = get_reg_val(id, vcpu->arch.spurr);
|
|
break;
|
|
case KVM_REG_PPC_AMR:
|
|
*val = get_reg_val(id, vcpu->arch.amr);
|
|
break;
|
|
case KVM_REG_PPC_UAMOR:
|
|
*val = get_reg_val(id, vcpu->arch.uamor);
|
|
break;
|
|
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRA:
|
|
i = id - KVM_REG_PPC_MMCR0;
|
|
*val = get_reg_val(id, vcpu->arch.mmcr[i]);
|
|
break;
|
|
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
|
|
i = id - KVM_REG_PPC_PMC1;
|
|
*val = get_reg_val(id, vcpu->arch.pmc[i]);
|
|
break;
|
|
case KVM_REG_PPC_SIAR:
|
|
*val = get_reg_val(id, vcpu->arch.siar);
|
|
break;
|
|
case KVM_REG_PPC_SDAR:
|
|
*val = get_reg_val(id, vcpu->arch.sdar);
|
|
break;
|
|
#ifdef CONFIG_VSX
|
|
case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
|
|
if (cpu_has_feature(CPU_FTR_VSX)) {
|
|
/* VSX => FP reg i is stored in arch.vsr[2*i] */
|
|
long int i = id - KVM_REG_PPC_FPR0;
|
|
*val = get_reg_val(id, vcpu->arch.vsr[2 * i]);
|
|
} else {
|
|
/* let generic code handle it */
|
|
r = -EINVAL;
|
|
}
|
|
break;
|
|
case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31:
|
|
if (cpu_has_feature(CPU_FTR_VSX)) {
|
|
long int i = id - KVM_REG_PPC_VSR0;
|
|
val->vsxval[0] = vcpu->arch.vsr[2 * i];
|
|
val->vsxval[1] = vcpu->arch.vsr[2 * i + 1];
|
|
} else {
|
|
r = -ENXIO;
|
|
}
|
|
break;
|
|
#endif /* CONFIG_VSX */
|
|
case KVM_REG_PPC_VPA_ADDR:
|
|
spin_lock(&vcpu->arch.vpa_update_lock);
|
|
*val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
|
|
spin_unlock(&vcpu->arch.vpa_update_lock);
|
|
break;
|
|
case KVM_REG_PPC_VPA_SLB:
|
|
spin_lock(&vcpu->arch.vpa_update_lock);
|
|
val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
|
|
val->vpaval.length = vcpu->arch.slb_shadow.len;
|
|
spin_unlock(&vcpu->arch.vpa_update_lock);
|
|
break;
|
|
case KVM_REG_PPC_VPA_DTL:
|
|
spin_lock(&vcpu->arch.vpa_update_lock);
|
|
val->vpaval.addr = vcpu->arch.dtl.next_gpa;
|
|
val->vpaval.length = vcpu->arch.dtl.len;
|
|
spin_unlock(&vcpu->arch.vpa_update_lock);
|
|
break;
|
|
case KVM_REG_PPC_TB_OFFSET:
|
|
*val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
|
|
break;
|
|
case KVM_REG_PPC_LPCR:
|
|
*val = get_reg_val(id, vcpu->arch.vcore->lpcr);
|
|
break;
|
|
case KVM_REG_PPC_PPR:
|
|
*val = get_reg_val(id, vcpu->arch.ppr);
|
|
break;
|
|
case KVM_REG_PPC_ARCH_COMPAT:
|
|
*val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
|
|
break;
|
|
default:
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
|
|
union kvmppc_one_reg *val)
|
|
{
|
|
int r = 0;
|
|
long int i;
|
|
unsigned long addr, len;
|
|
|
|
switch (id) {
|
|
case KVM_REG_PPC_HIOR:
|
|
/* Only allow this to be set to zero */
|
|
if (set_reg_val(id, *val))
|
|
r = -EINVAL;
|
|
break;
|
|
case KVM_REG_PPC_DABR:
|
|
vcpu->arch.dabr = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_DSCR:
|
|
vcpu->arch.dscr = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_PURR:
|
|
vcpu->arch.purr = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_SPURR:
|
|
vcpu->arch.spurr = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_AMR:
|
|
vcpu->arch.amr = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_UAMOR:
|
|
vcpu->arch.uamor = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRA:
|
|
i = id - KVM_REG_PPC_MMCR0;
|
|
vcpu->arch.mmcr[i] = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
|
|
i = id - KVM_REG_PPC_PMC1;
|
|
vcpu->arch.pmc[i] = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_SIAR:
|
|
vcpu->arch.siar = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_SDAR:
|
|
vcpu->arch.sdar = set_reg_val(id, *val);
|
|
break;
|
|
#ifdef CONFIG_VSX
|
|
case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
|
|
if (cpu_has_feature(CPU_FTR_VSX)) {
|
|
/* VSX => FP reg i is stored in arch.vsr[2*i] */
|
|
long int i = id - KVM_REG_PPC_FPR0;
|
|
vcpu->arch.vsr[2 * i] = set_reg_val(id, *val);
|
|
} else {
|
|
/* let generic code handle it */
|
|
r = -EINVAL;
|
|
}
|
|
break;
|
|
case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31:
|
|
if (cpu_has_feature(CPU_FTR_VSX)) {
|
|
long int i = id - KVM_REG_PPC_VSR0;
|
|
vcpu->arch.vsr[2 * i] = val->vsxval[0];
|
|
vcpu->arch.vsr[2 * i + 1] = val->vsxval[1];
|
|
} else {
|
|
r = -ENXIO;
|
|
}
|
|
break;
|
|
#endif /* CONFIG_VSX */
|
|
case KVM_REG_PPC_VPA_ADDR:
|
|
addr = set_reg_val(id, *val);
|
|
r = -EINVAL;
|
|
if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
|
|
vcpu->arch.dtl.next_gpa))
|
|
break;
|
|
r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
|
|
break;
|
|
case KVM_REG_PPC_VPA_SLB:
|
|
addr = val->vpaval.addr;
|
|
len = val->vpaval.length;
|
|
r = -EINVAL;
|
|
if (addr && !vcpu->arch.vpa.next_gpa)
|
|
break;
|
|
r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
|
|
break;
|
|
case KVM_REG_PPC_VPA_DTL:
|
|
addr = val->vpaval.addr;
|
|
len = val->vpaval.length;
|
|
r = -EINVAL;
|
|
if (addr && (len < sizeof(struct dtl_entry) ||
|
|
!vcpu->arch.vpa.next_gpa))
|
|
break;
|
|
len -= len % sizeof(struct dtl_entry);
|
|
r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
|
|
break;
|
|
case KVM_REG_PPC_TB_OFFSET:
|
|
/* round up to multiple of 2^24 */
|
|
vcpu->arch.vcore->tb_offset =
|
|
ALIGN(set_reg_val(id, *val), 1UL << 24);
|
|
break;
|
|
case KVM_REG_PPC_LPCR:
|
|
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val));
|
|
break;
|
|
case KVM_REG_PPC_PPR:
|
|
vcpu->arch.ppr = set_reg_val(id, *val);
|
|
break;
|
|
case KVM_REG_PPC_ARCH_COMPAT:
|
|
r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
|
|
break;
|
|
default:
|
|
r = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
|
|
unsigned int id)
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
int err = -EINVAL;
|
|
int core;
|
|
struct kvmppc_vcore *vcore;
|
|
|
|
core = id / threads_per_core;
|
|
if (core >= KVM_MAX_VCORES)
|
|
goto out;
|
|
|
|
err = -ENOMEM;
|
|
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
|
|
if (!vcpu)
|
|
goto out;
|
|
|
|
err = kvm_vcpu_init(vcpu, kvm, id);
|
|
if (err)
|
|
goto free_vcpu;
|
|
|
|
vcpu->arch.shared = &vcpu->arch.shregs;
|
|
vcpu->arch.mmcr[0] = MMCR0_FC;
|
|
vcpu->arch.ctrl = CTRL_RUNLATCH;
|
|
/* default to host PVR, since we can't spoof it */
|
|
kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
|
|
spin_lock_init(&vcpu->arch.vpa_update_lock);
|
|
spin_lock_init(&vcpu->arch.tbacct_lock);
|
|
vcpu->arch.busy_preempt = TB_NIL;
|
|
|
|
kvmppc_mmu_book3s_hv_init(vcpu);
|
|
|
|
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
|
|
|
|
init_waitqueue_head(&vcpu->arch.cpu_run);
|
|
|
|
mutex_lock(&kvm->lock);
|
|
vcore = kvm->arch.vcores[core];
|
|
if (!vcore) {
|
|
vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
|
|
if (vcore) {
|
|
INIT_LIST_HEAD(&vcore->runnable_threads);
|
|
spin_lock_init(&vcore->lock);
|
|
init_waitqueue_head(&vcore->wq);
|
|
vcore->preempt_tb = TB_NIL;
|
|
vcore->lpcr = kvm->arch.lpcr;
|
|
}
|
|
kvm->arch.vcores[core] = vcore;
|
|
kvm->arch.online_vcores++;
|
|
}
|
|
mutex_unlock(&kvm->lock);
|
|
|
|
if (!vcore)
|
|
goto free_vcpu;
|
|
|
|
spin_lock(&vcore->lock);
|
|
++vcore->num_threads;
|
|
spin_unlock(&vcore->lock);
|
|
vcpu->arch.vcore = vcore;
|
|
|
|
vcpu->arch.cpu_type = KVM_CPU_3S_64;
|
|
kvmppc_sanity_check(vcpu);
|
|
|
|
return vcpu;
|
|
|
|
free_vcpu:
|
|
kmem_cache_free(kvm_vcpu_cache, vcpu);
|
|
out:
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
|
|
{
|
|
if (vpa->pinned_addr)
|
|
kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
|
|
vpa->dirty);
|
|
}
|
|
|
|
static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
|
|
{
|
|
spin_lock(&vcpu->arch.vpa_update_lock);
|
|
unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
|
|
unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
|
|
unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
|
|
spin_unlock(&vcpu->arch.vpa_update_lock);
|
|
kvm_vcpu_uninit(vcpu);
|
|
kmem_cache_free(kvm_vcpu_cache, vcpu);
|
|
}
|
|
|
|
static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* Indicate we want to get back into the guest */
|
|
return 1;
|
|
}
|
|
|
|
static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long dec_nsec, now;
|
|
|
|
now = get_tb();
|
|
if (now > vcpu->arch.dec_expires) {
|
|
/* decrementer has already gone negative */
|
|
kvmppc_core_queue_dec(vcpu);
|
|
kvmppc_core_prepare_to_enter(vcpu);
|
|
return;
|
|
}
|
|
dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
|
|
/ tb_ticks_per_sec;
|
|
hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
|
|
HRTIMER_MODE_REL);
|
|
vcpu->arch.timer_running = 1;
|
|
}
|
|
|
|
static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->arch.ceded = 0;
|
|
if (vcpu->arch.timer_running) {
|
|
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
|
|
vcpu->arch.timer_running = 0;
|
|
}
|
|
}
|
|
|
|
extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
|
|
|
|
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 now;
|
|
|
|
if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
|
|
return;
|
|
spin_lock_irq(&vcpu->arch.tbacct_lock);
|
|
now = mftb();
|
|
vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
|
|
vcpu->arch.stolen_logged;
|
|
vcpu->arch.busy_preempt = now;
|
|
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
|
|
spin_unlock_irq(&vcpu->arch.tbacct_lock);
|
|
--vc->n_runnable;
|
|
list_del(&vcpu->arch.run_list);
|
|
}
|
|
|
|
static int kvmppc_grab_hwthread(int cpu)
|
|
{
|
|
struct paca_struct *tpaca;
|
|
long timeout = 1000;
|
|
|
|
tpaca = &paca[cpu];
|
|
|
|
/* Ensure the thread won't go into the kernel if it wakes */
|
|
tpaca->kvm_hstate.hwthread_req = 1;
|
|
tpaca->kvm_hstate.kvm_vcpu = NULL;
|
|
|
|
/*
|
|
* If the thread is already executing in the kernel (e.g. handling
|
|
* a stray interrupt), wait for it to get back to nap mode.
|
|
* The smp_mb() is to ensure that our setting of hwthread_req
|
|
* is visible before we look at hwthread_state, so if this
|
|
* races with the code at system_reset_pSeries and the thread
|
|
* misses our setting of hwthread_req, we are sure to see its
|
|
* setting of hwthread_state, and vice versa.
|
|
*/
|
|
smp_mb();
|
|
while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
|
|
if (--timeout <= 0) {
|
|
pr_err("KVM: couldn't grab cpu %d\n", cpu);
|
|
return -EBUSY;
|
|
}
|
|
udelay(1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void kvmppc_release_hwthread(int cpu)
|
|
{
|
|
struct paca_struct *tpaca;
|
|
|
|
tpaca = &paca[cpu];
|
|
tpaca->kvm_hstate.hwthread_req = 0;
|
|
tpaca->kvm_hstate.kvm_vcpu = NULL;
|
|
}
|
|
|
|
static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
|
|
{
|
|
int cpu;
|
|
struct paca_struct *tpaca;
|
|
struct kvmppc_vcore *vc = vcpu->arch.vcore;
|
|
|
|
if (vcpu->arch.timer_running) {
|
|
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
|
|
vcpu->arch.timer_running = 0;
|
|
}
|
|
cpu = vc->pcpu + vcpu->arch.ptid;
|
|
tpaca = &paca[cpu];
|
|
tpaca->kvm_hstate.kvm_vcpu = vcpu;
|
|
tpaca->kvm_hstate.kvm_vcore = vc;
|
|
tpaca->kvm_hstate.napping = 0;
|
|
vcpu->cpu = vc->pcpu;
|
|
smp_wmb();
|
|
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
|
|
if (vcpu->arch.ptid) {
|
|
xics_wake_cpu(cpu);
|
|
++vc->n_woken;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
|
|
{
|
|
int i;
|
|
|
|
HMT_low();
|
|
i = 0;
|
|
while (vc->nap_count < vc->n_woken) {
|
|
if (++i >= 1000000) {
|
|
pr_err("kvmppc_wait_for_nap timeout %d %d\n",
|
|
vc->nap_count, vc->n_woken);
|
|
break;
|
|
}
|
|
cpu_relax();
|
|
}
|
|
HMT_medium();
|
|
}
|
|
|
|
/*
|
|
* Check that we are on thread 0 and that any other threads in
|
|
* this core are off-line. Then grab the threads so they can't
|
|
* enter the kernel.
|
|
*/
|
|
static int on_primary_thread(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
int thr = cpu_thread_in_core(cpu);
|
|
|
|
if (thr)
|
|
return 0;
|
|
while (++thr < threads_per_core)
|
|
if (cpu_online(cpu + thr))
|
|
return 0;
|
|
|
|
/* Grab all hw threads so they can't go into the kernel */
|
|
for (thr = 1; thr < threads_per_core; ++thr) {
|
|
if (kvmppc_grab_hwthread(cpu + thr)) {
|
|
/* Couldn't grab one; let the others go */
|
|
do {
|
|
kvmppc_release_hwthread(cpu + thr);
|
|
} while (--thr > 0);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Run a set of guest threads on a physical core.
|
|
* Called with vc->lock held.
|
|
*/
|
|
static void kvmppc_run_core(struct kvmppc_vcore *vc)
|
|
{
|
|
struct kvm_vcpu *vcpu, *vcpu0, *vnext;
|
|
long ret;
|
|
u64 now;
|
|
int ptid, i, need_vpa_update;
|
|
int srcu_idx;
|
|
struct kvm_vcpu *vcpus_to_update[threads_per_core];
|
|
|
|
/* don't start if any threads have a signal pending */
|
|
need_vpa_update = 0;
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
|
|
if (signal_pending(vcpu->arch.run_task))
|
|
return;
|
|
if (vcpu->arch.vpa.update_pending ||
|
|
vcpu->arch.slb_shadow.update_pending ||
|
|
vcpu->arch.dtl.update_pending)
|
|
vcpus_to_update[need_vpa_update++] = vcpu;
|
|
}
|
|
|
|
/*
|
|
* Initialize *vc, in particular vc->vcore_state, so we can
|
|
* drop the vcore lock if necessary.
|
|
*/
|
|
vc->n_woken = 0;
|
|
vc->nap_count = 0;
|
|
vc->entry_exit_count = 0;
|
|
vc->vcore_state = VCORE_STARTING;
|
|
vc->in_guest = 0;
|
|
vc->napping_threads = 0;
|
|
|
|
/*
|
|
* Updating any of the vpas requires calling kvmppc_pin_guest_page,
|
|
* which can't be called with any spinlocks held.
|
|
*/
|
|
if (need_vpa_update) {
|
|
spin_unlock(&vc->lock);
|
|
for (i = 0; i < need_vpa_update; ++i)
|
|
kvmppc_update_vpas(vcpus_to_update[i]);
|
|
spin_lock(&vc->lock);
|
|
}
|
|
|
|
/*
|
|
* Assign physical thread IDs, first to non-ceded vcpus
|
|
* and then to ceded ones.
|
|
*/
|
|
ptid = 0;
|
|
vcpu0 = NULL;
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
|
|
if (!vcpu->arch.ceded) {
|
|
if (!ptid)
|
|
vcpu0 = vcpu;
|
|
vcpu->arch.ptid = ptid++;
|
|
}
|
|
}
|
|
if (!vcpu0)
|
|
goto out; /* nothing to run; should never happen */
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
|
|
if (vcpu->arch.ceded)
|
|
vcpu->arch.ptid = ptid++;
|
|
|
|
/*
|
|
* Make sure we are running on thread 0, and that
|
|
* secondary threads are offline.
|
|
*/
|
|
if (threads_per_core > 1 && !on_primary_thread()) {
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
|
|
vcpu->arch.ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
vc->pcpu = smp_processor_id();
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
|
|
kvmppc_start_thread(vcpu);
|
|
kvmppc_create_dtl_entry(vcpu, vc);
|
|
}
|
|
|
|
vc->vcore_state = VCORE_RUNNING;
|
|
preempt_disable();
|
|
spin_unlock(&vc->lock);
|
|
|
|
kvm_guest_enter();
|
|
|
|
srcu_idx = srcu_read_lock(&vcpu0->kvm->srcu);
|
|
|
|
__kvmppc_vcore_entry(NULL, vcpu0);
|
|
|
|
spin_lock(&vc->lock);
|
|
/* disable sending of IPIs on virtual external irqs */
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
|
|
vcpu->cpu = -1;
|
|
/* wait for secondary threads to finish writing their state to memory */
|
|
if (vc->nap_count < vc->n_woken)
|
|
kvmppc_wait_for_nap(vc);
|
|
for (i = 0; i < threads_per_core; ++i)
|
|
kvmppc_release_hwthread(vc->pcpu + i);
|
|
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
|
|
vc->vcore_state = VCORE_EXITING;
|
|
spin_unlock(&vc->lock);
|
|
|
|
srcu_read_unlock(&vcpu0->kvm->srcu, srcu_idx);
|
|
|
|
/* make sure updates to secondary vcpu structs are visible now */
|
|
smp_mb();
|
|
kvm_guest_exit();
|
|
|
|
preempt_enable();
|
|
cond_resched();
|
|
|
|
spin_lock(&vc->lock);
|
|
now = get_tb();
|
|
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
|
|
/* cancel pending dec exception if dec is positive */
|
|
if (now < vcpu->arch.dec_expires &&
|
|
kvmppc_core_pending_dec(vcpu))
|
|
kvmppc_core_dequeue_dec(vcpu);
|
|
|
|
ret = RESUME_GUEST;
|
|
if (vcpu->arch.trap)
|
|
ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
|
|
vcpu->arch.run_task);
|
|
|
|
vcpu->arch.ret = ret;
|
|
vcpu->arch.trap = 0;
|
|
|
|
if (vcpu->arch.ceded) {
|
|
if (ret != RESUME_GUEST)
|
|
kvmppc_end_cede(vcpu);
|
|
else
|
|
kvmppc_set_timer(vcpu);
|
|
}
|
|
}
|
|
|
|
out:
|
|
vc->vcore_state = VCORE_INACTIVE;
|
|
list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
|
|
arch.run_list) {
|
|
if (vcpu->arch.ret != RESUME_GUEST) {
|
|
kvmppc_remove_runnable(vc, vcpu);
|
|
wake_up(&vcpu->arch.cpu_run);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for some other vcpu thread to execute us, and
|
|
* wake us up when we need to handle something in the host.
|
|
*/
|
|
static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
|
|
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
|
|
schedule();
|
|
finish_wait(&vcpu->arch.cpu_run, &wait);
|
|
}
|
|
|
|
/*
|
|
* All the vcpus in this vcore are idle, so wait for a decrementer
|
|
* or external interrupt to one of the vcpus. vc->lock is held.
|
|
*/
|
|
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
|
|
vc->vcore_state = VCORE_SLEEPING;
|
|
spin_unlock(&vc->lock);
|
|
schedule();
|
|
finish_wait(&vc->wq, &wait);
|
|
spin_lock(&vc->lock);
|
|
vc->vcore_state = VCORE_INACTIVE;
|
|
}
|
|
|
|
static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
|
|
{
|
|
int n_ceded;
|
|
struct kvmppc_vcore *vc;
|
|
struct kvm_vcpu *v, *vn;
|
|
|
|
kvm_run->exit_reason = 0;
|
|
vcpu->arch.ret = RESUME_GUEST;
|
|
vcpu->arch.trap = 0;
|
|
kvmppc_update_vpas(vcpu);
|
|
|
|
/*
|
|
* Synchronize with other threads in this virtual core
|
|
*/
|
|
vc = vcpu->arch.vcore;
|
|
spin_lock(&vc->lock);
|
|
vcpu->arch.ceded = 0;
|
|
vcpu->arch.run_task = current;
|
|
vcpu->arch.kvm_run = kvm_run;
|
|
vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
|
|
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
|
|
vcpu->arch.busy_preempt = TB_NIL;
|
|
list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
|
|
++vc->n_runnable;
|
|
|
|
/*
|
|
* This happens the first time this is called for a vcpu.
|
|
* If the vcore is already running, we may be able to start
|
|
* this thread straight away and have it join in.
|
|
*/
|
|
if (!signal_pending(current)) {
|
|
if (vc->vcore_state == VCORE_RUNNING &&
|
|
VCORE_EXIT_COUNT(vc) == 0) {
|
|
vcpu->arch.ptid = vc->n_runnable - 1;
|
|
kvmppc_create_dtl_entry(vcpu, vc);
|
|
kvmppc_start_thread(vcpu);
|
|
} else if (vc->vcore_state == VCORE_SLEEPING) {
|
|
wake_up(&vc->wq);
|
|
}
|
|
|
|
}
|
|
|
|
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
|
|
!signal_pending(current)) {
|
|
if (vc->vcore_state != VCORE_INACTIVE) {
|
|
spin_unlock(&vc->lock);
|
|
kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
|
|
spin_lock(&vc->lock);
|
|
continue;
|
|
}
|
|
list_for_each_entry_safe(v, vn, &vc->runnable_threads,
|
|
arch.run_list) {
|
|
kvmppc_core_prepare_to_enter(v);
|
|
if (signal_pending(v->arch.run_task)) {
|
|
kvmppc_remove_runnable(vc, v);
|
|
v->stat.signal_exits++;
|
|
v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
|
|
v->arch.ret = -EINTR;
|
|
wake_up(&v->arch.cpu_run);
|
|
}
|
|
}
|
|
if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
|
|
break;
|
|
vc->runner = vcpu;
|
|
n_ceded = 0;
|
|
list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
|
|
if (!v->arch.pending_exceptions)
|
|
n_ceded += v->arch.ceded;
|
|
else
|
|
v->arch.ceded = 0;
|
|
}
|
|
if (n_ceded == vc->n_runnable)
|
|
kvmppc_vcore_blocked(vc);
|
|
else
|
|
kvmppc_run_core(vc);
|
|
vc->runner = NULL;
|
|
}
|
|
|
|
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
|
|
(vc->vcore_state == VCORE_RUNNING ||
|
|
vc->vcore_state == VCORE_EXITING)) {
|
|
spin_unlock(&vc->lock);
|
|
kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
|
|
spin_lock(&vc->lock);
|
|
}
|
|
|
|
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
|
|
kvmppc_remove_runnable(vc, vcpu);
|
|
vcpu->stat.signal_exits++;
|
|
kvm_run->exit_reason = KVM_EXIT_INTR;
|
|
vcpu->arch.ret = -EINTR;
|
|
}
|
|
|
|
if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
|
|
/* Wake up some vcpu to run the core */
|
|
v = list_first_entry(&vc->runnable_threads,
|
|
struct kvm_vcpu, arch.run_list);
|
|
wake_up(&v->arch.cpu_run);
|
|
}
|
|
|
|
spin_unlock(&vc->lock);
|
|
return vcpu->arch.ret;
|
|
}
|
|
|
|
static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
|
{
|
|
int r;
|
|
int srcu_idx;
|
|
|
|
if (!vcpu->arch.sane) {
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return -EINVAL;
|
|
}
|
|
|
|
kvmppc_core_prepare_to_enter(vcpu);
|
|
|
|
/* No need to go into the guest when all we'll do is come back out */
|
|
if (signal_pending(current)) {
|
|
run->exit_reason = KVM_EXIT_INTR;
|
|
return -EINTR;
|
|
}
|
|
|
|
atomic_inc(&vcpu->kvm->arch.vcpus_running);
|
|
/* Order vcpus_running vs. rma_setup_done, see kvmppc_alloc_reset_hpt */
|
|
smp_mb();
|
|
|
|
/* On the first time here, set up HTAB and VRMA or RMA */
|
|
if (!vcpu->kvm->arch.rma_setup_done) {
|
|
r = kvmppc_hv_setup_htab_rma(vcpu);
|
|
if (r)
|
|
goto out;
|
|
}
|
|
|
|
flush_fp_to_thread(current);
|
|
flush_altivec_to_thread(current);
|
|
flush_vsx_to_thread(current);
|
|
vcpu->arch.wqp = &vcpu->arch.vcore->wq;
|
|
vcpu->arch.pgdir = current->mm->pgd;
|
|
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
|
|
|
|
do {
|
|
r = kvmppc_run_vcpu(run, vcpu);
|
|
|
|
if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
|
|
!(vcpu->arch.shregs.msr & MSR_PR)) {
|
|
r = kvmppc_pseries_do_hcall(vcpu);
|
|
kvmppc_core_prepare_to_enter(vcpu);
|
|
} else if (r == RESUME_PAGE_FAULT) {
|
|
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
r = kvmppc_book3s_hv_page_fault(run, vcpu,
|
|
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
|
|
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
|
|
}
|
|
} while (r == RESUME_GUEST);
|
|
|
|
out:
|
|
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
|
|
atomic_dec(&vcpu->kvm->arch.vcpus_running);
|
|
return r;
|
|
}
|
|
|
|
|
|
/* Work out RMLS (real mode limit selector) field value for a given RMA size.
|
|
Assumes POWER7 or PPC970. */
|
|
static inline int lpcr_rmls(unsigned long rma_size)
|
|
{
|
|
switch (rma_size) {
|
|
case 32ul << 20: /* 32 MB */
|
|
if (cpu_has_feature(CPU_FTR_ARCH_206))
|
|
return 8; /* only supported on POWER7 */
|
|
return -1;
|
|
case 64ul << 20: /* 64 MB */
|
|
return 3;
|
|
case 128ul << 20: /* 128 MB */
|
|
return 7;
|
|
case 256ul << 20: /* 256 MB */
|
|
return 4;
|
|
case 1ul << 30: /* 1 GB */
|
|
return 2;
|
|
case 16ul << 30: /* 16 GB */
|
|
return 1;
|
|
case 256ul << 30: /* 256 GB */
|
|
return 0;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct page *page;
|
|
struct kvm_rma_info *ri = vma->vm_file->private_data;
|
|
|
|
if (vmf->pgoff >= kvm_rma_pages)
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
page = pfn_to_page(ri->base_pfn + vmf->pgoff);
|
|
get_page(page);
|
|
vmf->page = page;
|
|
return 0;
|
|
}
|
|
|
|
static const struct vm_operations_struct kvm_rma_vm_ops = {
|
|
.fault = kvm_rma_fault,
|
|
};
|
|
|
|
static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_ops = &kvm_rma_vm_ops;
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_rma_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct kvm_rma_info *ri = filp->private_data;
|
|
|
|
kvm_release_rma(ri);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations kvm_rma_fops = {
|
|
.mmap = kvm_rma_mmap,
|
|
.release = kvm_rma_release,
|
|
};
|
|
|
|
static long kvm_vm_ioctl_allocate_rma(struct kvm *kvm,
|
|
struct kvm_allocate_rma *ret)
|
|
{
|
|
long fd;
|
|
struct kvm_rma_info *ri;
|
|
/*
|
|
* Only do this on PPC970 in HV mode
|
|
*/
|
|
if (!cpu_has_feature(CPU_FTR_HVMODE) ||
|
|
!cpu_has_feature(CPU_FTR_ARCH_201))
|
|
return -EINVAL;
|
|
|
|
if (!kvm_rma_pages)
|
|
return -EINVAL;
|
|
|
|
ri = kvm_alloc_rma();
|
|
if (!ri)
|
|
return -ENOMEM;
|
|
|
|
fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR | O_CLOEXEC);
|
|
if (fd < 0)
|
|
kvm_release_rma(ri);
|
|
|
|
ret->rma_size = kvm_rma_pages << PAGE_SHIFT;
|
|
return fd;
|
|
}
|
|
|
|
static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
|
|
int linux_psize)
|
|
{
|
|
struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
|
|
|
|
if (!def->shift)
|
|
return;
|
|
(*sps)->page_shift = def->shift;
|
|
(*sps)->slb_enc = def->sllp;
|
|
(*sps)->enc[0].page_shift = def->shift;
|
|
/*
|
|
* Only return base page encoding. We don't want to return
|
|
* all the supporting pte_enc, because our H_ENTER doesn't
|
|
* support MPSS yet. Once they do, we can start passing all
|
|
* support pte_enc here
|
|
*/
|
|
(*sps)->enc[0].pte_enc = def->penc[linux_psize];
|
|
(*sps)++;
|
|
}
|
|
|
|
static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
|
|
struct kvm_ppc_smmu_info *info)
|
|
{
|
|
struct kvm_ppc_one_seg_page_size *sps;
|
|
|
|
info->flags = KVM_PPC_PAGE_SIZES_REAL;
|
|
if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
|
|
info->flags |= KVM_PPC_1T_SEGMENTS;
|
|
info->slb_size = mmu_slb_size;
|
|
|
|
/* We only support these sizes for now, and no muti-size segments */
|
|
sps = &info->sps[0];
|
|
kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
|
|
kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
|
|
kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get (and clear) the dirty memory log for a memory slot.
|
|
*/
|
|
static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
|
|
struct kvm_dirty_log *log)
|
|
{
|
|
struct kvm_memory_slot *memslot;
|
|
int r;
|
|
unsigned long n;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
|
|
r = -EINVAL;
|
|
if (log->slot >= KVM_USER_MEM_SLOTS)
|
|
goto out;
|
|
|
|
memslot = id_to_memslot(kvm->memslots, log->slot);
|
|
r = -ENOENT;
|
|
if (!memslot->dirty_bitmap)
|
|
goto out;
|
|
|
|
n = kvm_dirty_bitmap_bytes(memslot);
|
|
memset(memslot->dirty_bitmap, 0, n);
|
|
|
|
r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
|
|
if (r)
|
|
goto out;
|
|
|
|
r = -EFAULT;
|
|
if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
|
|
goto out;
|
|
|
|
r = 0;
|
|
out:
|
|
mutex_unlock(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
static void unpin_slot(struct kvm_memory_slot *memslot)
|
|
{
|
|
unsigned long *physp;
|
|
unsigned long j, npages, pfn;
|
|
struct page *page;
|
|
|
|
physp = memslot->arch.slot_phys;
|
|
npages = memslot->npages;
|
|
if (!physp)
|
|
return;
|
|
for (j = 0; j < npages; j++) {
|
|
if (!(physp[j] & KVMPPC_GOT_PAGE))
|
|
continue;
|
|
pfn = physp[j] >> PAGE_SHIFT;
|
|
page = pfn_to_page(pfn);
|
|
SetPageDirty(page);
|
|
put_page(page);
|
|
}
|
|
}
|
|
|
|
static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
|
|
struct kvm_memory_slot *dont)
|
|
{
|
|
if (!dont || free->arch.rmap != dont->arch.rmap) {
|
|
vfree(free->arch.rmap);
|
|
free->arch.rmap = NULL;
|
|
}
|
|
if (!dont || free->arch.slot_phys != dont->arch.slot_phys) {
|
|
unpin_slot(free);
|
|
vfree(free->arch.slot_phys);
|
|
free->arch.slot_phys = NULL;
|
|
}
|
|
}
|
|
|
|
static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
|
|
unsigned long npages)
|
|
{
|
|
slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
|
|
if (!slot->arch.rmap)
|
|
return -ENOMEM;
|
|
slot->arch.slot_phys = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
|
|
struct kvm_memory_slot *memslot,
|
|
struct kvm_userspace_memory_region *mem)
|
|
{
|
|
unsigned long *phys;
|
|
|
|
/* Allocate a slot_phys array if needed */
|
|
phys = memslot->arch.slot_phys;
|
|
if (!kvm->arch.using_mmu_notifiers && !phys && memslot->npages) {
|
|
phys = vzalloc(memslot->npages * sizeof(unsigned long));
|
|
if (!phys)
|
|
return -ENOMEM;
|
|
memslot->arch.slot_phys = phys;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
|
|
struct kvm_userspace_memory_region *mem,
|
|
const struct kvm_memory_slot *old)
|
|
{
|
|
unsigned long npages = mem->memory_size >> PAGE_SHIFT;
|
|
struct kvm_memory_slot *memslot;
|
|
|
|
if (npages && old->npages) {
|
|
/*
|
|
* If modifying a memslot, reset all the rmap dirty bits.
|
|
* If this is a new memslot, we don't need to do anything
|
|
* since the rmap array starts out as all zeroes,
|
|
* i.e. no pages are dirty.
|
|
*/
|
|
memslot = id_to_memslot(kvm->memslots, mem->slot);
|
|
kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update LPCR values in kvm->arch and in vcores.
|
|
* Caller must hold kvm->lock.
|
|
*/
|
|
void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
|
|
{
|
|
long int i;
|
|
u32 cores_done = 0;
|
|
|
|
if ((kvm->arch.lpcr & mask) == lpcr)
|
|
return;
|
|
|
|
kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
|
|
|
|
for (i = 0; i < KVM_MAX_VCORES; ++i) {
|
|
struct kvmppc_vcore *vc = kvm->arch.vcores[i];
|
|
if (!vc)
|
|
continue;
|
|
spin_lock(&vc->lock);
|
|
vc->lpcr = (vc->lpcr & ~mask) | lpcr;
|
|
spin_unlock(&vc->lock);
|
|
if (++cores_done >= kvm->arch.online_vcores)
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
|
|
{
|
|
int err = 0;
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_rma_info *ri = NULL;
|
|
unsigned long hva;
|
|
struct kvm_memory_slot *memslot;
|
|
struct vm_area_struct *vma;
|
|
unsigned long lpcr = 0, senc;
|
|
unsigned long lpcr_mask = 0;
|
|
unsigned long psize, porder;
|
|
unsigned long rma_size;
|
|
unsigned long rmls;
|
|
unsigned long *physp;
|
|
unsigned long i, npages;
|
|
int srcu_idx;
|
|
|
|
mutex_lock(&kvm->lock);
|
|
if (kvm->arch.rma_setup_done)
|
|
goto out; /* another vcpu beat us to it */
|
|
|
|
/* Allocate hashed page table (if not done already) and reset it */
|
|
if (!kvm->arch.hpt_virt) {
|
|
err = kvmppc_alloc_hpt(kvm, NULL);
|
|
if (err) {
|
|
pr_err("KVM: Couldn't alloc HPT\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Look up the memslot for guest physical address 0 */
|
|
srcu_idx = srcu_read_lock(&kvm->srcu);
|
|
memslot = gfn_to_memslot(kvm, 0);
|
|
|
|
/* We must have some memory at 0 by now */
|
|
err = -EINVAL;
|
|
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
|
|
goto out_srcu;
|
|
|
|
/* Look up the VMA for the start of this memory slot */
|
|
hva = memslot->userspace_addr;
|
|
down_read(¤t->mm->mmap_sem);
|
|
vma = find_vma(current->mm, hva);
|
|
if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
|
|
goto up_out;
|
|
|
|
psize = vma_kernel_pagesize(vma);
|
|
porder = __ilog2(psize);
|
|
|
|
/* Is this one of our preallocated RMAs? */
|
|
if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops &&
|
|
hva == vma->vm_start)
|
|
ri = vma->vm_file->private_data;
|
|
|
|
up_read(¤t->mm->mmap_sem);
|
|
|
|
if (!ri) {
|
|
/* On POWER7, use VRMA; on PPC970, give up */
|
|
err = -EPERM;
|
|
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
|
|
pr_err("KVM: CPU requires an RMO\n");
|
|
goto out_srcu;
|
|
}
|
|
|
|
/* We can handle 4k, 64k or 16M pages in the VRMA */
|
|
err = -EINVAL;
|
|
if (!(psize == 0x1000 || psize == 0x10000 ||
|
|
psize == 0x1000000))
|
|
goto out_srcu;
|
|
|
|
/* Update VRMASD field in the LPCR */
|
|
senc = slb_pgsize_encoding(psize);
|
|
kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
|
|
(VRMA_VSID << SLB_VSID_SHIFT_1T);
|
|
lpcr_mask = LPCR_VRMASD;
|
|
/* the -4 is to account for senc values starting at 0x10 */
|
|
lpcr = senc << (LPCR_VRMASD_SH - 4);
|
|
|
|
/* Create HPTEs in the hash page table for the VRMA */
|
|
kvmppc_map_vrma(vcpu, memslot, porder);
|
|
|
|
} else {
|
|
/* Set up to use an RMO region */
|
|
rma_size = kvm_rma_pages;
|
|
if (rma_size > memslot->npages)
|
|
rma_size = memslot->npages;
|
|
rma_size <<= PAGE_SHIFT;
|
|
rmls = lpcr_rmls(rma_size);
|
|
err = -EINVAL;
|
|
if ((long)rmls < 0) {
|
|
pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size);
|
|
goto out_srcu;
|
|
}
|
|
atomic_inc(&ri->use_count);
|
|
kvm->arch.rma = ri;
|
|
|
|
/* Update LPCR and RMOR */
|
|
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
|
|
/* PPC970; insert RMLS value (split field) in HID4 */
|
|
lpcr_mask = (1ul << HID4_RMLS0_SH) |
|
|
(3ul << HID4_RMLS2_SH) | HID4_RMOR;
|
|
lpcr = ((rmls >> 2) << HID4_RMLS0_SH) |
|
|
((rmls & 3) << HID4_RMLS2_SH);
|
|
/* RMOR is also in HID4 */
|
|
lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
|
|
<< HID4_RMOR_SH;
|
|
} else {
|
|
/* POWER7 */
|
|
lpcr_mask = LPCR_VPM0 | LPCR_VRMA_L | LPCR_RMLS;
|
|
lpcr = rmls << LPCR_RMLS_SH;
|
|
kvm->arch.rmor = ri->base_pfn << PAGE_SHIFT;
|
|
}
|
|
pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n",
|
|
ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
|
|
|
|
/* Initialize phys addrs of pages in RMO */
|
|
npages = kvm_rma_pages;
|
|
porder = __ilog2(npages);
|
|
physp = memslot->arch.slot_phys;
|
|
if (physp) {
|
|
if (npages > memslot->npages)
|
|
npages = memslot->npages;
|
|
spin_lock(&kvm->arch.slot_phys_lock);
|
|
for (i = 0; i < npages; ++i)
|
|
physp[i] = ((ri->base_pfn + i) << PAGE_SHIFT) +
|
|
porder;
|
|
spin_unlock(&kvm->arch.slot_phys_lock);
|
|
}
|
|
}
|
|
|
|
kvmppc_update_lpcr(kvm, lpcr, lpcr_mask);
|
|
|
|
/* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
|
|
smp_wmb();
|
|
kvm->arch.rma_setup_done = 1;
|
|
err = 0;
|
|
out_srcu:
|
|
srcu_read_unlock(&kvm->srcu, srcu_idx);
|
|
out:
|
|
mutex_unlock(&kvm->lock);
|
|
return err;
|
|
|
|
up_out:
|
|
up_read(¤t->mm->mmap_sem);
|
|
goto out_srcu;
|
|
}
|
|
|
|
static int kvmppc_core_init_vm_hv(struct kvm *kvm)
|
|
{
|
|
unsigned long lpcr, lpid;
|
|
|
|
/* Allocate the guest's logical partition ID */
|
|
|
|
lpid = kvmppc_alloc_lpid();
|
|
if ((long)lpid < 0)
|
|
return -ENOMEM;
|
|
kvm->arch.lpid = lpid;
|
|
|
|
/*
|
|
* Since we don't flush the TLB when tearing down a VM,
|
|
* and this lpid might have previously been used,
|
|
* make sure we flush on each core before running the new VM.
|
|
*/
|
|
cpumask_setall(&kvm->arch.need_tlb_flush);
|
|
|
|
kvm->arch.rma = NULL;
|
|
|
|
kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
|
|
|
|
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
|
|
/* PPC970; HID4 is effectively the LPCR */
|
|
kvm->arch.host_lpid = 0;
|
|
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
|
|
lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
|
|
lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
|
|
((lpid & 0xf) << HID4_LPID5_SH);
|
|
} else {
|
|
/* POWER7; init LPCR for virtual RMA mode */
|
|
kvm->arch.host_lpid = mfspr(SPRN_LPID);
|
|
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
|
|
lpcr &= LPCR_PECE | LPCR_LPES;
|
|
lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
|
|
LPCR_VPM0 | LPCR_VPM1;
|
|
kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
|
|
(VRMA_VSID << SLB_VSID_SHIFT_1T);
|
|
}
|
|
kvm->arch.lpcr = lpcr;
|
|
|
|
kvm->arch.using_mmu_notifiers = !!cpu_has_feature(CPU_FTR_ARCH_206);
|
|
spin_lock_init(&kvm->arch.slot_phys_lock);
|
|
|
|
/*
|
|
* Don't allow secondary CPU threads to come online
|
|
* while any KVM VMs exist.
|
|
*/
|
|
inhibit_secondary_onlining();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvmppc_free_vcores(struct kvm *kvm)
|
|
{
|
|
long int i;
|
|
|
|
for (i = 0; i < KVM_MAX_VCORES; ++i)
|
|
kfree(kvm->arch.vcores[i]);
|
|
kvm->arch.online_vcores = 0;
|
|
}
|
|
|
|
static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
|
|
{
|
|
uninhibit_secondary_onlining();
|
|
|
|
kvmppc_free_vcores(kvm);
|
|
if (kvm->arch.rma) {
|
|
kvm_release_rma(kvm->arch.rma);
|
|
kvm->arch.rma = NULL;
|
|
}
|
|
|
|
kvmppc_free_hpt(kvm);
|
|
}
|
|
|
|
/* We don't need to emulate any privileged instructions or dcbz */
|
|
static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
|
|
unsigned int inst, int *advance)
|
|
{
|
|
return EMULATE_FAIL;
|
|
}
|
|
|
|
static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
|
|
ulong spr_val)
|
|
{
|
|
return EMULATE_FAIL;
|
|
}
|
|
|
|
static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
|
|
ulong *spr_val)
|
|
{
|
|
return EMULATE_FAIL;
|
|
}
|
|
|
|
static int kvmppc_core_check_processor_compat_hv(void)
|
|
{
|
|
if (!cpu_has_feature(CPU_FTR_HVMODE))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static long kvm_arch_vm_ioctl_hv(struct file *filp,
|
|
unsigned int ioctl, unsigned long arg)
|
|
{
|
|
struct kvm *kvm __maybe_unused = filp->private_data;
|
|
void __user *argp = (void __user *)arg;
|
|
long r;
|
|
|
|
switch (ioctl) {
|
|
|
|
case KVM_ALLOCATE_RMA: {
|
|
struct kvm_allocate_rma rma;
|
|
struct kvm *kvm = filp->private_data;
|
|
|
|
r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
|
|
if (r >= 0 && copy_to_user(argp, &rma, sizeof(rma)))
|
|
r = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case KVM_PPC_ALLOCATE_HTAB: {
|
|
u32 htab_order;
|
|
|
|
r = -EFAULT;
|
|
if (get_user(htab_order, (u32 __user *)argp))
|
|
break;
|
|
r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
|
|
if (r)
|
|
break;
|
|
r = -EFAULT;
|
|
if (put_user(htab_order, (u32 __user *)argp))
|
|
break;
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
case KVM_PPC_GET_HTAB_FD: {
|
|
struct kvm_get_htab_fd ghf;
|
|
|
|
r = -EFAULT;
|
|
if (copy_from_user(&ghf, argp, sizeof(ghf)))
|
|
break;
|
|
r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
r = -ENOTTY;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static struct kvmppc_ops kvm_ops_hv = {
|
|
.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
|
|
.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
|
|
.get_one_reg = kvmppc_get_one_reg_hv,
|
|
.set_one_reg = kvmppc_set_one_reg_hv,
|
|
.vcpu_load = kvmppc_core_vcpu_load_hv,
|
|
.vcpu_put = kvmppc_core_vcpu_put_hv,
|
|
.set_msr = kvmppc_set_msr_hv,
|
|
.vcpu_run = kvmppc_vcpu_run_hv,
|
|
.vcpu_create = kvmppc_core_vcpu_create_hv,
|
|
.vcpu_free = kvmppc_core_vcpu_free_hv,
|
|
.check_requests = kvmppc_core_check_requests_hv,
|
|
.get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
|
|
.flush_memslot = kvmppc_core_flush_memslot_hv,
|
|
.prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
|
|
.commit_memory_region = kvmppc_core_commit_memory_region_hv,
|
|
.unmap_hva = kvm_unmap_hva_hv,
|
|
.unmap_hva_range = kvm_unmap_hva_range_hv,
|
|
.age_hva = kvm_age_hva_hv,
|
|
.test_age_hva = kvm_test_age_hva_hv,
|
|
.set_spte_hva = kvm_set_spte_hva_hv,
|
|
.mmu_destroy = kvmppc_mmu_destroy_hv,
|
|
.free_memslot = kvmppc_core_free_memslot_hv,
|
|
.create_memslot = kvmppc_core_create_memslot_hv,
|
|
.init_vm = kvmppc_core_init_vm_hv,
|
|
.destroy_vm = kvmppc_core_destroy_vm_hv,
|
|
.get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
|
|
.emulate_op = kvmppc_core_emulate_op_hv,
|
|
.emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
|
|
.emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
|
|
.fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
|
|
.arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
|
|
};
|
|
|
|
static int kvmppc_book3s_init_hv(void)
|
|
{
|
|
int r;
|
|
/*
|
|
* FIXME!! Do we need to check on all cpus ?
|
|
*/
|
|
r = kvmppc_core_check_processor_compat_hv();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
kvm_ops_hv.owner = THIS_MODULE;
|
|
kvmppc_hv_ops = &kvm_ops_hv;
|
|
|
|
r = kvmppc_mmu_hv_init();
|
|
return r;
|
|
}
|
|
|
|
static void kvmppc_book3s_exit_hv(void)
|
|
{
|
|
kvmppc_hv_ops = NULL;
|
|
}
|
|
|
|
module_init(kvmppc_book3s_init_hv);
|
|
module_exit(kvmppc_book3s_exit_hv);
|
|
MODULE_LICENSE("GPL");
|