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Subject[PATCH v4 03/10] KVM/x86: KVM_CAP_X86_GUEST_LBR
Date
Introduce KVM_CAP_X86_GUEST_LBR to allow per-VM enabling of the guest
lbr feature.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/x86.c | 15 +++++++++++++++
include/uapi/linux/kvm.h | 1 +
3 files changed, 18 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index fbda5a9..0831ac6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -865,6 +865,7 @@ struct kvm_arch {
atomic_t vapics_in_nmi_mode;
struct mutex apic_map_lock;
struct kvm_apic_map *apic_map;
+ struct x86_perf_lbr_stack lbr_stack;

bool apic_access_page_done;

@@ -873,6 +874,7 @@ struct kvm_arch {
bool mwait_in_guest;
bool hlt_in_guest;
bool pause_in_guest;
+ bool lbr_in_guest;

unsigned long irq_sources_bitmap;
s64 kvmclock_offset;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f049ecf..50efee4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3018,6 +3018,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_GET_MSR_FEATURES:
case KVM_CAP_MSR_PLATFORM_INFO:
case KVM_CAP_EXCEPTION_PAYLOAD:
+ case KVM_CAP_X86_GUEST_LBR:
r = 1;
break;
case KVM_CAP_SYNC_REGS:
@@ -4502,6 +4503,20 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
kvm->arch.exception_payload_enabled = cap->args[0];
r = 0;
break;
+ case KVM_CAP_X86_GUEST_LBR:
+ r = -EINVAL;
+ if (cap->args[0] &&
+ x86_perf_get_lbr_stack(&kvm->arch.lbr_stack)) {
+ pr_err("Failed to enable the guest lbr feature\n");
+ break;
+ }
+ if (copy_to_user((void __user *)cap->args[1],
+ &kvm->arch.lbr_stack,
+ sizeof(struct x86_perf_lbr_stack)))
+ break;
+ kvm->arch.lbr_in_guest = cap->args[0];
+ r = 0;
+ break;
default:
r = -EINVAL;
break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2b7a652..ffe31b1 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -975,6 +975,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_HYPERV_ENLIGHTENED_VMCS 163
#define KVM_CAP_EXCEPTION_PAYLOAD 164
#define KVM_CAP_ARM_VM_IPA_SIZE 165
+#define KVM_CAP_X86_GUEST_LBR 166

#ifdef KVM_CAP_IRQ_ROUTING

--
2.7.4
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