376 lines
10 KiB
C
376 lines
10 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS MMU handling in the KVM module.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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#include <linux/highmem.h>
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#include <linux/kvm_host.h>
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#include <asm/mmu_context.h>
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static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu)
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{
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int cpu = smp_processor_id();
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return vcpu->arch.guest_kernel_asid[cpu] &
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cpu_asid_mask(&cpu_data[cpu]);
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}
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static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu)
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{
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int cpu = smp_processor_id();
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return vcpu->arch.guest_user_asid[cpu] &
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cpu_asid_mask(&cpu_data[cpu]);
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}
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static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn)
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{
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int srcu_idx, err = 0;
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kvm_pfn_t pfn;
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if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE)
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return 0;
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srcu_idx = srcu_read_lock(&kvm->srcu);
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pfn = gfn_to_pfn(kvm, gfn);
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if (is_error_pfn(pfn)) {
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kvm_err("Couldn't get pfn for gfn %#llx!\n", gfn);
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err = -EFAULT;
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goto out;
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}
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kvm->arch.guest_pmap[gfn] = pfn;
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out:
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srcu_read_unlock(&kvm->srcu, srcu_idx);
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return err;
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}
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/* Translate guest KSEG0 addresses to Host PA */
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unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
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unsigned long gva)
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{
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gfn_t gfn;
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unsigned long offset = gva & ~PAGE_MASK;
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struct kvm *kvm = vcpu->kvm;
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if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) {
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kvm_err("%s/%p: Invalid gva: %#lx\n", __func__,
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__builtin_return_address(0), gva);
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return KVM_INVALID_PAGE;
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}
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gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT);
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if (gfn >= kvm->arch.guest_pmap_npages) {
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kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn,
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gva);
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return KVM_INVALID_PAGE;
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}
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if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
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return KVM_INVALID_ADDR;
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return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset;
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}
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/* XXXKYMA: Must be called with interrupts disabled */
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int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
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struct kvm_vcpu *vcpu)
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{
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gfn_t gfn;
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kvm_pfn_t pfn0, pfn1;
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unsigned long vaddr = 0;
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unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
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struct kvm *kvm = vcpu->kvm;
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const int flush_dcache_mask = 0;
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int ret;
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if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) {
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kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr);
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kvm_mips_dump_host_tlbs();
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return -1;
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}
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gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT);
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if (gfn >= kvm->arch.guest_pmap_npages) {
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kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__,
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gfn, badvaddr);
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kvm_mips_dump_host_tlbs();
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return -1;
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}
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vaddr = badvaddr & (PAGE_MASK << 1);
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if (kvm_mips_map_page(vcpu->kvm, gfn) < 0)
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return -1;
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if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0)
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return -1;
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pfn0 = kvm->arch.guest_pmap[gfn & ~0x1];
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pfn1 = kvm->arch.guest_pmap[gfn | 0x1];
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entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) |
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((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
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ENTRYLO_D | ENTRYLO_V;
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entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) |
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((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
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ENTRYLO_D | ENTRYLO_V;
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preempt_disable();
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entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu));
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ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
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flush_dcache_mask);
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preempt_enable();
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return ret;
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}
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int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
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struct kvm_mips_tlb *tlb)
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{
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unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0;
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struct kvm *kvm = vcpu->kvm;
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kvm_pfn_t pfn0, pfn1;
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int ret;
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if ((tlb->tlb_hi & VPN2_MASK) == 0) {
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pfn0 = 0;
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pfn1 = 0;
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} else {
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if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo[0])
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>> PAGE_SHIFT) < 0)
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return -1;
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if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo[1])
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>> PAGE_SHIFT) < 0)
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return -1;
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pfn0 = kvm->arch.guest_pmap[
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mips3_tlbpfn_to_paddr(tlb->tlb_lo[0]) >> PAGE_SHIFT];
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pfn1 = kvm->arch.guest_pmap[
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mips3_tlbpfn_to_paddr(tlb->tlb_lo[1]) >> PAGE_SHIFT];
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}
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/* Get attributes from the Guest TLB */
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entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) |
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((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
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(tlb->tlb_lo[0] & ENTRYLO_D) |
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(tlb->tlb_lo[0] & ENTRYLO_V);
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entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) |
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((_page_cachable_default >> _CACHE_SHIFT) << ENTRYLO_C_SHIFT) |
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(tlb->tlb_lo[1] & ENTRYLO_D) |
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(tlb->tlb_lo[1] & ENTRYLO_V);
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kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc,
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tlb->tlb_lo[0], tlb->tlb_lo[1]);
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preempt_disable();
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entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ?
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kvm_mips_get_kernel_asid(vcpu) :
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kvm_mips_get_user_asid(vcpu));
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ret = kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1,
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tlb->tlb_mask);
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preempt_enable();
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return ret;
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}
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void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
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struct kvm_vcpu *vcpu)
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{
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unsigned long asid = asid_cache(cpu);
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asid += cpu_asid_inc();
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if (!(asid & cpu_asid_mask(&cpu_data[cpu]))) {
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if (cpu_has_vtag_icache)
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flush_icache_all();
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kvm_local_flush_tlb_all(); /* start new asid cycle */
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if (!asid) /* fix version if needed */
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asid = asid_first_version(cpu);
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}
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cpu_context(cpu, mm) = asid_cache(cpu) = asid;
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}
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/**
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* kvm_mips_migrate_count() - Migrate timer.
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* @vcpu: Virtual CPU.
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*
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* Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it
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* if it was running prior to being cancelled.
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*
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* Must be called when the VCPU is migrated to a different CPU to ensure that
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* timer expiry during guest execution interrupts the guest and causes the
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* interrupt to be delivered in a timely manner.
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*/
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static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu)
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{
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if (hrtimer_cancel(&vcpu->arch.comparecount_timer))
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hrtimer_restart(&vcpu->arch.comparecount_timer);
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}
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/* Restore ASID once we are scheduled back after preemption */
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void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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{
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unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]);
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unsigned long flags;
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int newasid = 0;
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kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu);
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/* Allocate new kernel and user ASIDs if needed */
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local_irq_save(flags);
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if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) &
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asid_version_mask(cpu)) {
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kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu);
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vcpu->arch.guest_kernel_asid[cpu] =
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vcpu->arch.guest_kernel_mm.context.asid[cpu];
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kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu);
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vcpu->arch.guest_user_asid[cpu] =
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vcpu->arch.guest_user_mm.context.asid[cpu];
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newasid++;
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kvm_debug("[%d]: cpu_context: %#lx\n", cpu,
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cpu_context(cpu, current->mm));
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kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n",
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cpu, vcpu->arch.guest_kernel_asid[cpu]);
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kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu,
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vcpu->arch.guest_user_asid[cpu]);
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}
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if (vcpu->arch.last_sched_cpu != cpu) {
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kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
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vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
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/*
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* Migrate the timer interrupt to the current CPU so that it
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* always interrupts the guest and synchronously triggers a
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* guest timer interrupt.
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*/
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kvm_mips_migrate_count(vcpu);
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}
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if (!newasid) {
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/*
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* If we preempted while the guest was executing, then reload
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* the pre-empted ASID
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*/
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if (current->flags & PF_VCPU) {
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write_c0_entryhi(vcpu->arch.
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preempt_entryhi & asid_mask);
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ehb();
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}
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} else {
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/* New ASIDs were allocated for the VM */
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/*
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* Were we in guest context? If so then the pre-empted ASID is
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* no longer valid, we need to set it to what it should be based
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* on the mode of the Guest (Kernel/User)
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*/
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if (current->flags & PF_VCPU) {
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if (KVM_GUEST_KERNEL_MODE(vcpu))
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write_c0_entryhi(vcpu->arch.
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guest_kernel_asid[cpu] &
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asid_mask);
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else
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write_c0_entryhi(vcpu->arch.
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guest_user_asid[cpu] &
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asid_mask);
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ehb();
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}
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}
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/* restore guest state to registers */
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kvm_mips_callbacks->vcpu_set_regs(vcpu);
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local_irq_restore(flags);
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}
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/* ASID can change if another task is scheduled during preemption */
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void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
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{
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unsigned long flags;
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int cpu;
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local_irq_save(flags);
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cpu = smp_processor_id();
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vcpu->arch.preempt_entryhi = read_c0_entryhi();
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vcpu->arch.last_sched_cpu = cpu;
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/* save guest state in registers */
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kvm_mips_callbacks->vcpu_get_regs(vcpu);
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if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) &
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asid_version_mask(cpu))) {
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kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__,
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cpu_context(cpu, current->mm));
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drop_mmu_context(current->mm, cpu);
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}
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write_c0_entryhi(cpu_asid(cpu, current->mm));
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ehb();
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local_irq_restore(flags);
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}
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u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu)
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{
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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unsigned long paddr, flags, vpn2, asid;
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unsigned long va = (unsigned long)opc;
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void *vaddr;
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u32 inst;
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int index;
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if (KVM_GUEST_KSEGX(va) < KVM_GUEST_KSEG0 ||
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KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG23) {
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local_irq_save(flags);
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index = kvm_mips_host_tlb_lookup(vcpu, va);
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if (index >= 0) {
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inst = *(opc);
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} else {
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vpn2 = va & VPN2_MASK;
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asid = kvm_read_c0_guest_entryhi(cop0) &
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KVM_ENTRYHI_ASID;
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index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid);
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if (index < 0) {
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kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n",
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__func__, opc, vcpu, read_c0_entryhi());
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kvm_mips_dump_host_tlbs();
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kvm_mips_dump_guest_tlbs(vcpu);
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local_irq_restore(flags);
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return KVM_INVALID_INST;
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}
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kvm_mips_handle_mapped_seg_tlb_fault(vcpu,
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&vcpu->arch.
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guest_tlb[index]);
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inst = *(opc);
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}
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local_irq_restore(flags);
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} else if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) {
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paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu, va);
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vaddr = kmap_atomic(pfn_to_page(PHYS_PFN(paddr)));
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vaddr += paddr & ~PAGE_MASK;
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inst = *(u32 *)vaddr;
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kunmap_atomic(vaddr);
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} else {
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kvm_err("%s: illegal address: %p\n", __func__, opc);
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return KVM_INVALID_INST;
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}
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return inst;
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}
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