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kvm: svm: Add IA32_FLUSH_CMD guest support

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Expose IA32_FLUSH_CMD to the guest if the guest CPUID enumerates
support for this MSR. As with IA32_PRED_CMD, permission for
unintercepted writes to this MSR will be granted to the guest after
the first non-zero write.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20230201132905.549148-3-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2023-02-01 08:29:04 -05:00 committed by Paolo Bonzini
parent a807b78ad0
commit 723d5fb0ff
1 changed files with 30 additions and 13 deletions
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43
arch/x86/kvm/svm/svm.c
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@ -2869,6 +2869,28 @@ static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
return 0;
}
static int svm_set_msr_ia32_cmd(struct kvm_vcpu *vcpu, struct msr_data *msr,
bool guest_has_feat, u64 cmd,
int x86_feature_bit)
{
struct vcpu_svm *svm = to_svm(vcpu);
if (!msr->host_initiated && !guest_has_feat)
return 1;
if (!(msr->data & ~cmd))
return 1;
if (!boot_cpu_has(x86_feature_bit))
return 1;
if (!msr->data)
return 0;
wrmsrl(msr->index, cmd);
set_msr_interception(vcpu, svm->msrpm, msr->index, 0, 1);
return 0;
}
static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
{
struct vcpu_svm *svm = to_svm(vcpu);
@ -2943,19 +2965,14 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
break;
case MSR_IA32_PRED_CMD:
if (!msr->host_initiated &&
!guest_has_pred_cmd_msr(vcpu))
return 1;
if (data & ~PRED_CMD_IBPB)
return 1;
if (!boot_cpu_has(X86_FEATURE_IBPB))
return 1;
if (!data)
break;
wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
r = svm_set_msr_ia32_cmd(vcpu, msr,
guest_has_pred_cmd_msr(vcpu),
PRED_CMD_IBPB, X86_FEATURE_IBPB);
break;
case MSR_IA32_FLUSH_CMD:
r = svm_set_msr_ia32_cmd(vcpu, msr,
guest_cpuid_has(vcpu, X86_FEATURE_FLUSH_L1D),
L1D_FLUSH, X86_FEATURE_FLUSH_L1D);
break;
case MSR_AMD64_VIRT_SPEC_CTRL:
if (!msr->host_initiated &&