Commit 4c84926e authored by Maxim Levitsky's avatar Maxim Levitsky Committed by Paolo Bonzini
Browse files

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



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

Signed-off-by: default avatarMaxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210914154825.104886-9-mlevitsk@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0226a45c

arch/x86/kvm/svm/svm.c

+12 −1
Original line number Diff line number Diff line
@@ -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;