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KVM: VMX: Directly query Intel PT mode when refreshing PMUs

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Use vmx_pt_mode_is_host_guest() in intel_pmu_refresh() instead of
bouncing through kvm_x86_ops->pt_supported, and remove ->pt_supported()
as the PMU code was the last remaining user.

Opportunistically clean up the wording of a comment that referenced
kvm_x86_ops->pt_supported().

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-03-02 15:57:00 -08:00 committed by Paolo Bonzini
parent 7b874c26a6
commit a1bead2aba
5 changed files with 4 additions and 20 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -1176,8 +1176,6 @@ struct kvm_x86_ops {
void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu,
enum exit_fastpath_completion *exit_fastpath);
bool (*pt_supported)(void);
int (*check_nested_events)(struct kvm_vcpu *vcpu);
void (*request_immediate_exit)(struct kvm_vcpu *vcpu);

7
arch/x86/kvm/svm.c
View File

@ -6074,11 +6074,6 @@ static int svm_get_lpage_level(void)
return PT_PDPE_LEVEL;
}
static bool svm_pt_supported(void)
{
return false;
}
static bool svm_has_wbinvd_exit(void)
{
return true;
@ -7440,8 +7435,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpuid_update = svm_cpuid_update,
.pt_supported = svm_pt_supported,
.set_supported_cpuid = svm_set_supported_cpuid,
.has_wbinvd_exit = svm_has_wbinvd_exit,

2
arch/x86/kvm/vmx/pmu_intel.c
View File

@ -335,7 +335,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
pmu->global_ovf_ctrl_mask = pmu->global_ctrl_mask
& ~(MSR_CORE_PERF_GLOBAL_OVF_CTRL_OVF_BUF |
MSR_CORE_PERF_GLOBAL_OVF_CTRL_COND_CHGD);
if (kvm_x86_ops->pt_supported())
if (vmx_pt_mode_is_host_guest())
pmu->global_ovf_ctrl_mask &=
~MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI;

6
arch/x86/kvm/vmx/vmx.c
View File

@ -6306,11 +6306,6 @@ static bool vmx_has_emulated_msr(int index)
}
}
static bool vmx_pt_supported(void)
{
return vmx_pt_mode_is_host_guest();
}
static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
{
u32 exit_intr_info;
@ -7945,7 +7940,6 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.check_intercept = vmx_check_intercept,
.handle_exit_irqoff = vmx_handle_exit_irqoff,
.pt_supported = vmx_pt_supported,
.request_immediate_exit = vmx_request_immediate_exit,

7
arch/x86/kvm/x86.c
View File

@ -2820,10 +2820,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
!guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
return 1;
/*
* We do support PT if kvm_x86_ops->pt_supported(), but we do
* not support IA32_XSS[bit 8]. Guests will have to use
* RDMSR/WRMSR rather than XSAVES/XRSTORS to save/restore PT
* MSRs.
* KVM supports exposing PT to the guest, but does not support
* IA32_XSS[bit 8]. Guests have to use RDMSR/WRMSR rather than
* XSAVES/XRSTORS to save/restore PT MSRs.
*/
if (data != 0)
return 1;