From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 07/12] KVM: nSVM: Use KVM-governed feature framework to track "TSC scaling enabled"
Date: Fri, 17 Feb 2023 15:10:17 -0800 [thread overview]
Message-ID: <20230217231022.816138-8-seanjc@google.com> (raw)
In-Reply-To: <20230217231022.816138-1-seanjc@google.com>
Track "TSC scaling exposed to L1" via a governed feature flag instead of
using a dedicated bit/flag in vcpu_svm.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/governed_features.h | 1 +
arch/x86/kvm/svm/nested.c | 4 ++--
arch/x86/kvm/svm/svm.c | 12 ++++++++----
arch/x86/kvm/svm/svm.h | 1 -
4 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index 359914112615..0335576a80a8 100644
--- a/arch/x86/kvm/governed_features.h
+++ b/arch/x86/kvm/governed_features.h
@@ -8,6 +8,7 @@ BUILD_BUG()
KVM_GOVERNED_X86_FEATURE(GBPAGES)
KVM_GOVERNED_X86_FEATURE(XSAVES)
KVM_GOVERNED_X86_FEATURE(NRIPS)
+KVM_GOVERNED_X86_FEATURE(TSCRATEMSR)
#undef KVM_GOVERNED_X86_FEATURE
#undef KVM_GOVERNED_FEATURE
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 0641cb943450..30e00c4e07c7 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -673,7 +673,7 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm,
vmcb02->control.tsc_offset = vcpu->arch.tsc_offset;
if (svm->tsc_ratio_msr != kvm_caps.default_tsc_scaling_ratio) {
- WARN_ON(!svm->tsc_scaling_enabled);
+ WARN_ON(!guest_can_use(vcpu, X86_FEATURE_TSCRATEMSR));
nested_svm_update_tsc_ratio_msr(vcpu);
}
@@ -1043,7 +1043,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
}
if (svm->tsc_ratio_msr != kvm_caps.default_tsc_scaling_ratio) {
- WARN_ON(!svm->tsc_scaling_enabled);
+ WARN_ON(!guest_can_use(vcpu, X86_FEATURE_TSCRATEMSR));
vcpu->arch.tsc_scaling_ratio = vcpu->arch.l1_tsc_scaling_ratio;
__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);
}
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index cdffc6db8bc5..dd4aead5462c 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2737,7 +2737,8 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
switch (msr_info->index) {
case MSR_AMD64_TSC_RATIO:
- if (!msr_info->host_initiated && !svm->tsc_scaling_enabled)
+ if (!msr_info->host_initiated &&
+ !guest_can_use(vcpu, X86_FEATURE_TSCRATEMSR))
return 1;
msr_info->data = svm->tsc_ratio_msr;
break;
@@ -2879,7 +2880,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
switch (ecx) {
case MSR_AMD64_TSC_RATIO:
- if (!svm->tsc_scaling_enabled) {
+ if (!guest_can_use(vcpu, X86_FEATURE_TSCRATEMSR)) {
if (!msr->host_initiated)
return 1;
@@ -2901,7 +2902,8 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
svm->tsc_ratio_msr = data;
- if (svm->tsc_scaling_enabled && is_guest_mode(vcpu))
+ if (guest_can_use(vcpu, X86_FEATURE_TSCRATEMSR) &&
+ is_guest_mode(vcpu))
nested_svm_update_tsc_ratio_msr(vcpu);
break;
@@ -4146,7 +4148,9 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
if (kvm_cpu_cap_has(X86_FEATURE_NRIPS))
kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_NRIPS);
- svm->tsc_scaling_enabled = tsc_scaling && guest_cpuid_has(vcpu, X86_FEATURE_TSCRATEMSR);
+ if (tsc_scaling)
+ kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_TSCRATEMSR);
+
svm->lbrv_enabled = lbrv && guest_cpuid_has(vcpu, X86_FEATURE_LBRV);
svm->v_vmload_vmsave_enabled = vls && guest_cpuid_has(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD);
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index bd6ee6945bdd..a523cfcdd12e 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -258,7 +258,6 @@ struct vcpu_svm {
bool soft_int_injected;
/* optional nested SVM features that are enabled for this guest */
- bool tsc_scaling_enabled : 1;
bool v_vmload_vmsave_enabled : 1;
bool lbrv_enabled : 1;
bool pause_filter_enabled : 1;
--
2.39.2.637.g21b0678d19-goog
next prev parent reply other threads:[~2023-02-17 23:11 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-17 23:10 [PATCH 00/12] KVM: x86: Add "governed" X86_FEATURE framework Sean Christopherson
2023-02-17 23:10 ` [PATCH 01/12] KVM: x86: Add a framework for enabling KVM-governed x86 features Sean Christopherson
2023-02-21 17:12 ` Vitaly Kuznetsov
2023-06-29 2:40 ` Binbin Wu
2023-06-29 16:26 ` Sean Christopherson
2023-06-30 8:01 ` Chao Gao
2023-06-30 15:31 ` Sean Christopherson
2023-02-17 23:10 ` [PATCH 02/12] KVM: x86/mmu: Use KVM-governed feature framework to track "GBPAGES enabled" Sean Christopherson
2023-02-17 23:10 ` [PATCH 03/12] KVM: VMX: Recompute "XSAVES enabled" only after CPUID update Sean Christopherson
2023-02-17 23:10 ` [PATCH 04/12] KVM: VMX: Rename XSAVES control to follow KVM's preferred "ENABLE_XYZ" Sean Christopherson
2023-02-17 23:10 ` [PATCH 05/12] KVM: x86: Use KVM-governed feature framework to track "XSAVES enabled" Sean Christopherson
2023-02-21 14:56 ` Yu Zhang
2023-02-22 18:56 ` Sean Christopherson
2023-02-24 9:54 ` Yu Zhang
2023-02-17 23:10 ` [PATCH 06/12] KVM: nSVM: Use KVM-governed feature framework to track "NRIPS enabled" Sean Christopherson
2023-02-17 23:10 ` Sean Christopherson [this message]
2023-02-17 23:10 ` [PATCH 08/12] KVM: nSVM: Use KVM-governed feature framework to track "vVM{SAVE,LOAD} enabled" Sean Christopherson
2023-02-21 15:23 ` Yu Zhang
2023-02-21 15:33 ` Yu Zhang
2023-02-21 23:48 ` Sean Christopherson
2023-02-22 6:49 ` Yu Zhang
2023-02-22 16:39 ` Sean Christopherson
2023-02-24 9:25 ` Yu Zhang
2023-02-24 16:16 ` Sean Christopherson
2023-06-29 16:50 ` Sean Christopherson
2023-06-30 10:00 ` Yu Zhang
2023-02-17 23:10 ` [PATCH 09/12] KVM: nSVM: Use KVM-governed feature framework to track "LBRv enabled" Sean Christopherson
2023-02-17 23:10 ` [PATCH 10/12] KVM: nSVM: Use KVM-governed feature framework to track "Pause Filter enabled" Sean Christopherson
2023-02-17 23:10 ` [PATCH 11/12] KVM: nSVM: Use KVM-governed feature framework to track "vGIF enabled" Sean Christopherson
2023-02-17 23:10 ` [PATCH 12/12] KVM: x86: Disallow guest CPUID lookups when IRQs are disabled Sean Christopherson
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