KVM: PPC: Book3S HV: Add a new KVM device for the XIVE native exploitation mode
This is the basic framework for the new KVM device supporting the XIVE native exploitation mode. The user interface exposes a new KVM device to be created by QEMU, only available when running on a L0 hypervisor. Support for nested guests is not available yet. The XIVE device reuses the device structure of the XICS-on-XIVE device as they have a lot in common. That could possibly change in the future if the need arise. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
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a878957a81
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@ -0,0 +1,19 @@
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POWER9 eXternal Interrupt Virtualization Engine (XIVE Gen1)
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==========================================================
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Device types supported:
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KVM_DEV_TYPE_XIVE POWER9 XIVE Interrupt Controller generation 1
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This device acts as a VM interrupt controller. It provides the KVM
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interface to configure the interrupt sources of a VM in the underlying
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POWER9 XIVE interrupt controller.
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Only one XIVE instance may be instantiated. A guest XIVE device
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requires a POWER9 host and the guest OS should have support for the
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XIVE native exploitation interrupt mode. If not, it should run using
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the legacy interrupt mode, referred as XICS (POWER7/8).
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* Groups:
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1. KVM_DEV_XIVE_GRP_CTRL
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Provides global controls on the device
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@ -225,6 +225,7 @@ extern struct kvm_device_ops kvm_xics_ops;
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struct kvmppc_xive;
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struct kvmppc_xive;
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struct kvmppc_xive_vcpu;
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struct kvmppc_xive_vcpu;
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extern struct kvm_device_ops kvm_xive_ops;
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extern struct kvm_device_ops kvm_xive_ops;
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extern struct kvm_device_ops kvm_xive_native_ops;
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struct kvmppc_passthru_irqmap;
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struct kvmppc_passthru_irqmap;
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@ -593,6 +593,10 @@ extern int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval);
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extern int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,
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extern int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,
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int level, bool line_status);
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int level, bool line_status);
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extern void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu);
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extern void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu);
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extern void kvmppc_xive_native_init_module(void);
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extern void kvmppc_xive_native_exit_module(void);
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#else
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#else
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static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
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static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
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u32 priority) { return -1; }
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u32 priority) { return -1; }
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@ -616,6 +620,10 @@ static inline int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval) { retur
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static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,
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static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,
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int level, bool line_status) { return -ENODEV; }
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int level, bool line_status) { return -ENODEV; }
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static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { }
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static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { }
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static inline void kvmppc_xive_native_init_module(void) { }
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static inline void kvmppc_xive_native_exit_module(void) { }
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#endif /* CONFIG_KVM_XIVE */
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#endif /* CONFIG_KVM_XIVE */
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#if defined(CONFIG_PPC_POWERNV) && defined(CONFIG_KVM_BOOK3S_64_HANDLER)
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#if defined(CONFIG_PPC_POWERNV) && defined(CONFIG_KVM_BOOK3S_64_HANDLER)
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@ -677,4 +677,7 @@ struct kvm_ppc_cpu_char {
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#define KVM_XICS_PRESENTED (1ULL << 43)
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#define KVM_XICS_PRESENTED (1ULL << 43)
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#define KVM_XICS_QUEUED (1ULL << 44)
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#define KVM_XICS_QUEUED (1ULL << 44)
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/* POWER9 XIVE Native Interrupt Controller */
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#define KVM_DEV_XIVE_GRP_CTRL 1
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#endif /* __LINUX_KVM_POWERPC_H */
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#endif /* __LINUX_KVM_POWERPC_H */
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@ -94,7 +94,7 @@ endif
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kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
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kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
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book3s_xics.o
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book3s_xics.o
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kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o
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kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o book3s_xive_native.o
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kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o
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kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o
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kvm-book3s_64-module-objs := \
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kvm-book3s_64-module-objs := \
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@ -1050,6 +1050,9 @@ static int kvmppc_book3s_init(void)
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if (xics_on_xive()) {
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if (xics_on_xive()) {
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kvmppc_xive_init_module();
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kvmppc_xive_init_module();
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kvm_register_device_ops(&kvm_xive_ops, KVM_DEV_TYPE_XICS);
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kvm_register_device_ops(&kvm_xive_ops, KVM_DEV_TYPE_XICS);
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kvmppc_xive_native_init_module();
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kvm_register_device_ops(&kvm_xive_native_ops,
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KVM_DEV_TYPE_XIVE);
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} else
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} else
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#endif
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#endif
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kvm_register_device_ops(&kvm_xics_ops, KVM_DEV_TYPE_XICS);
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kvm_register_device_ops(&kvm_xics_ops, KVM_DEV_TYPE_XICS);
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@ -1060,8 +1063,10 @@ static int kvmppc_book3s_init(void)
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static void kvmppc_book3s_exit(void)
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static void kvmppc_book3s_exit(void)
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{
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{
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#ifdef CONFIG_KVM_XICS
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#ifdef CONFIG_KVM_XICS
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if (xics_on_xive())
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if (xics_on_xive()) {
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kvmppc_xive_exit_module();
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kvmppc_xive_exit_module();
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kvmppc_xive_native_exit_module();
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}
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#endif
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#endif
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#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
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#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
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kvmppc_book3s_exit_pr();
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kvmppc_book3s_exit_pr();
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@ -0,0 +1,179 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2017-2019, IBM Corporation.
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*/
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#define pr_fmt(fmt) "xive-kvm: " fmt
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#include <linux/kernel.h>
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#include <linux/kvm_host.h>
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#include <linux/err.h>
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#include <linux/gfp.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/kvm_book3s.h>
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#include <asm/kvm_ppc.h>
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#include <asm/hvcall.h>
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#include <asm/xive.h>
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#include <asm/xive-regs.h>
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#include <asm/debug.h>
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#include <asm/debugfs.h>
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#include <asm/opal.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include "book3s_xive.h"
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static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
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struct kvm_device_attr *attr)
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{
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switch (attr->group) {
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case KVM_DEV_XIVE_GRP_CTRL:
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break;
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}
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return -ENXIO;
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}
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static int kvmppc_xive_native_get_attr(struct kvm_device *dev,
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struct kvm_device_attr *attr)
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{
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return -ENXIO;
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}
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static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
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struct kvm_device_attr *attr)
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{
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switch (attr->group) {
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case KVM_DEV_XIVE_GRP_CTRL:
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break;
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}
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return -ENXIO;
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}
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static void kvmppc_xive_native_free(struct kvm_device *dev)
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{
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struct kvmppc_xive *xive = dev->private;
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struct kvm *kvm = xive->kvm;
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debugfs_remove(xive->dentry);
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pr_devel("Destroying xive native device\n");
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if (kvm)
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kvm->arch.xive = NULL;
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if (xive->vp_base != XIVE_INVALID_VP)
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xive_native_free_vp_block(xive->vp_base);
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kfree(xive);
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kfree(dev);
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}
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static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type)
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{
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struct kvmppc_xive *xive;
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struct kvm *kvm = dev->kvm;
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int ret = 0;
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pr_devel("Creating xive native device\n");
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if (kvm->arch.xive)
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return -EEXIST;
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xive = kzalloc(sizeof(*xive), GFP_KERNEL);
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if (!xive)
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return -ENOMEM;
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dev->private = xive;
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xive->dev = dev;
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xive->kvm = kvm;
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kvm->arch.xive = xive;
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/*
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* Allocate a bunch of VPs. KVM_MAX_VCPUS is a large value for
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* a default. Getting the max number of CPUs the VM was
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* configured with would improve our usage of the XIVE VP space.
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*/
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xive->vp_base = xive_native_alloc_vp_block(KVM_MAX_VCPUS);
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pr_devel("VP_Base=%x\n", xive->vp_base);
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if (xive->vp_base == XIVE_INVALID_VP)
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ret = -ENXIO;
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xive->single_escalation = xive_native_has_single_escalation();
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if (ret)
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kfree(xive);
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return ret;
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}
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static int xive_native_debug_show(struct seq_file *m, void *private)
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{
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struct kvmppc_xive *xive = m->private;
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struct kvm *kvm = xive->kvm;
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if (!kvm)
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return 0;
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return 0;
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}
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static int xive_native_debug_open(struct inode *inode, struct file *file)
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{
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return single_open(file, xive_native_debug_show, inode->i_private);
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}
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static const struct file_operations xive_native_debug_fops = {
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.open = xive_native_debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static void xive_native_debugfs_init(struct kvmppc_xive *xive)
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{
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char *name;
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name = kasprintf(GFP_KERNEL, "kvm-xive-%p", xive);
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if (!name) {
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pr_err("%s: no memory for name\n", __func__);
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return;
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}
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xive->dentry = debugfs_create_file(name, 0444, powerpc_debugfs_root,
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xive, &xive_native_debug_fops);
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pr_debug("%s: created %s\n", __func__, name);
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kfree(name);
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}
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static void kvmppc_xive_native_init(struct kvm_device *dev)
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{
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struct kvmppc_xive *xive = (struct kvmppc_xive *)dev->private;
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/* Register some debug interfaces */
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xive_native_debugfs_init(xive);
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}
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struct kvm_device_ops kvm_xive_native_ops = {
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.name = "kvm-xive-native",
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.create = kvmppc_xive_native_create,
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.init = kvmppc_xive_native_init,
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.destroy = kvmppc_xive_native_free,
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.set_attr = kvmppc_xive_native_set_attr,
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.get_attr = kvmppc_xive_native_get_attr,
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.has_attr = kvmppc_xive_native_has_attr,
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};
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void kvmppc_xive_native_init_module(void)
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{
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;
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}
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void kvmppc_xive_native_exit_module(void)
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{
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;
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}
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@ -1211,6 +1211,8 @@ enum kvm_device_type {
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#define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
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#define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
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KVM_DEV_TYPE_ARM_VGIC_ITS,
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KVM_DEV_TYPE_ARM_VGIC_ITS,
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#define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS
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#define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS
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KVM_DEV_TYPE_XIVE,
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#define KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_XIVE
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KVM_DEV_TYPE_MAX,
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KVM_DEV_TYPE_MAX,
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};
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};
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