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KVM: nVMX: Expose load IA32_PERF_GLOBAL_CTRL VM-{Entry,Exit} control 

The "load IA32_PERF_GLOBAL_CTRL" bit for VM-entry and VM-exit should
only be exposed to the guest if IA32_PERF_GLOBAL_CTRL is a valid MSR.
Create a new helper to allow pmu_refresh() to update the VM-Entry and
VM-Exit controls to ensure PMU values are initialized when performing
the is_valid_msr() check.

Suggested-by: Jim Mattson <jmattson@google.com>
Co-developed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Oliver Upton 2019-11-13 16:17:20 -08:00 committed by Paolo Bonzini
parent 71f7347025
commit 03a8871add
3 changed files with 25 additions and 0 deletions
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21
arch/x86/kvm/vmx/nested.c
View File

@ -4359,6 +4359,27 @@ int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
return 0;
}
void nested_vmx_pmu_entry_exit_ctls_update(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx;
if (!nested_vmx_allowed(vcpu))
return;
vmx = to_vmx(vcpu);
if (kvm_x86_ops->pmu_ops->is_valid_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL)) {
vmx->nested.msrs.entry_ctls_high |=
VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
vmx->nested.msrs.exit_ctls_high |=
VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
} else {
vmx->nested.msrs.entry_ctls_high &=
~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
vmx->nested.msrs.exit_ctls_high &=
~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
}
}
static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer)
{
gva_t gva;

1
arch/x86/kvm/vmx/nested.h
View File

@ -22,6 +22,7 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata);
int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
u32 vmx_instruction_info, bool wr, int len, gva_t *ret);
void nested_vmx_pmu_entry_exit_ctls_update(struct kvm_vcpu *vcpu);
static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
{

3
arch/x86/kvm/vmx/pmu_intel.c
View File

@ -15,6 +15,7 @@
#include "x86.h"
#include "cpuid.h"
#include "lapic.h"
#include "nested.h"
#include "pmu.h"
static struct kvm_event_hw_type_mapping intel_arch_events[] = {
@ -335,6 +336,8 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
0, pmu->nr_arch_gp_counters);
bitmap_set(pmu->all_valid_pmc_idx,
INTEL_PMC_MAX_GENERIC, pmu->nr_arch_fixed_counters);
nested_vmx_pmu_entry_exit_ctls_update(vcpu);
}
static void intel_pmu_init(struct kvm_vcpu *vcpu)