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KVM: x86: SVM: add module param to control LBR virtualization

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This is useful for debug and also makes it consistent with
the rest of the SVM optional features.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210914154825.104886-9-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2021-09-14 18:48:19 +03:00 committed by Paolo Bonzini
parent 0226a45c46
commit 4c84926e22
1 changed files with 12 additions and 1 deletions
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13
arch/x86/kvm/svm/svm.c
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@ -186,6 +186,10 @@ module_param(vls, int, 0444);
static int vgif = true;
module_param(vgif, int, 0444);
/* enable/disable LBR virtualization */
static int lbrv = true;
module_param(lbrv, int, 0444);
/*
* enable / disable AVIC. Because the defaults differ for APICv
* support between VMX and SVM we cannot use module_param_named.
@ -1059,6 +1063,13 @@ static __init int svm_hardware_setup(void)
pr_info("Virtual GIF supported\n");
}
if (lbrv) {
if (!boot_cpu_has(X86_FEATURE_LBRV))
lbrv = false;
else
pr_info("LBR virtualization supported\n");
}
svm_set_cpu_caps();
/*
@ -2923,7 +2934,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
svm->tsc_aux = data;
break;
case MSR_IA32_DEBUGCTLMSR:
if (!boot_cpu_has(X86_FEATURE_LBRV)) {
if (!lbrv) {
vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
__func__, data);
break;