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Message-ID: <20230217231022.816138-10-seanjc@google.com>
Date: Fri, 17 Feb 2023 15:10:19 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/12] KVM: nSVM: Use KVM-governed feature framework to track
"LBRv enabled"
Track "LBR virtualization 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@...gle.com>
---
arch/x86/kvm/governed_features.h | 1 +
arch/x86/kvm/svm/nested.c | 23 +++++++++++++----------
arch/x86/kvm/svm/svm.c | 7 +++++--
arch/x86/kvm/svm/svm.h | 1 -
4 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kvm/governed_features.h b/arch/x86/kvm/governed_features.h
index b66b9d550f33..16c58d61bdf6 100644
--- a/arch/x86/kvm/governed_features.h
+++ b/arch/x86/kvm/governed_features.h
@@ -10,6 +10,7 @@ KVM_GOVERNED_X86_FEATURE(XSAVES)
KVM_GOVERNED_X86_FEATURE(NRIPS)
KVM_GOVERNED_X86_FEATURE(TSCRATEMSR)
KVM_GOVERNED_X86_FEATURE(V_VMSAVE_VMLOAD)
+KVM_GOVERNED_X86_FEATURE(LBRV)
#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 6a96058c0e48..9e210b03e635 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -540,6 +540,7 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
bool new_vmcb12 = false;
struct vmcb *vmcb01 = svm->vmcb01.ptr;
struct vmcb *vmcb02 = svm->nested.vmcb02.ptr;
+ struct kvm_vcpu *vcpu = &svm->vcpu;
nested_vmcb02_compute_g_pat(svm);
@@ -565,18 +566,18 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
vmcb_mark_dirty(vmcb02, VMCB_DT);
}
- kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
+ kvm_set_rflags(vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
- svm_set_efer(&svm->vcpu, svm->nested.save.efer);
+ svm_set_efer(vcpu, svm->nested.save.efer);
- svm_set_cr0(&svm->vcpu, svm->nested.save.cr0);
- svm_set_cr4(&svm->vcpu, svm->nested.save.cr4);
+ svm_set_cr0(vcpu, svm->nested.save.cr0);
+ svm_set_cr4(vcpu, svm->nested.save.cr4);
svm->vcpu.arch.cr2 = vmcb12->save.cr2;
- kvm_rax_write(&svm->vcpu, vmcb12->save.rax);
- kvm_rsp_write(&svm->vcpu, vmcb12->save.rsp);
- kvm_rip_write(&svm->vcpu, vmcb12->save.rip);
+ kvm_rax_write(vcpu, vmcb12->save.rax);
+ kvm_rsp_write(vcpu, vmcb12->save.rsp);
+ kvm_rip_write(vcpu, vmcb12->save.rip);
/* In case we don't even reach vcpu_run, the fields are not updated */
vmcb02->save.rax = vmcb12->save.rax;
@@ -590,7 +591,8 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12
vmcb_mark_dirty(vmcb02, VMCB_DR);
}
- if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
+ if (unlikely(guest_can_use(vcpu, X86_FEATURE_LBRV) &&
+ (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
/*
* Reserved bits of DEBUGCTL are ignored. Be consistent with
* svm_set_msr's definition of reserved bits.
@@ -712,7 +714,7 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm,
vmcb02->control.virt_ext = vmcb01->control.virt_ext &
LBR_CTL_ENABLE_MASK;
- if (svm->lbrv_enabled)
+ if (guest_can_use(vcpu, X86_FEATURE_LBRV))
vmcb02->control.virt_ext |=
(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK);
@@ -1021,7 +1023,8 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
svm_switch_vmcb(svm, &svm->vmcb01);
- if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
+ if (unlikely(guest_can_use(vcpu, X86_FEATURE_LBRV) &&
+ (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) {
svm_copy_lbrs(vmcb12, vmcb02);
svm_update_lbrv(vcpu);
} else if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) {
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b3f0271c73b9..42591c77f98a 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -994,9 +994,11 @@ void svm_update_lbrv(struct kvm_vcpu *vcpu)
bool current_enable_lbrv = !!(svm->vmcb->control.virt_ext &
LBR_CTL_ENABLE_MASK);
- if (unlikely(is_guest_mode(vcpu) && svm->lbrv_enabled))
+ if (unlikely(is_guest_mode(vcpu) &&
+ guest_can_use(vcpu, X86_FEATURE_LBRV))) {
if (unlikely(svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))
enable_lbrv = true;
+ }
if (enable_lbrv == current_enable_lbrv)
return;
@@ -4149,7 +4151,8 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
if (tsc_scaling)
kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_TSCRATEMSR);
- svm->lbrv_enabled = lbrv && guest_cpuid_has(vcpu, X86_FEATURE_LBRV);
+ if (lbrv)
+ kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_LBRV);
if (vls && !guest_cpuid_is_intel(vcpu))
kvm_governed_feature_check_and_set(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD);
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 1e3e7462b1d7..60817ff346b0 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 lbrv_enabled : 1;
bool pause_filter_enabled : 1;
bool pause_threshold_enabled : 1;
bool vgif_enabled : 1;
--
2.39.2.637.g21b0678d19-goog
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