Commit edf72123 authored by Maxim Levitsky's avatar Maxim Levitsky Committed by Paolo Bonzini
Browse files

KVM: x86: SVM: allow to force AVIC to be enabled 



Apparently on some systems AVIC is disabled in CPUID but still usable.

Allow the user to override the CPUID if the user is willing to
take the risk.

Signed-off-by: default avatarMaxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220301143650.143749-7-mlevitsk@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent b9f3973a

arch/x86/kvm/svm/svm.c

+9 −2
Original line number Diff line number Diff line
@@ -189,6 +189,9 @@ module_param(tsc_scaling, int, 0444); 
static bool avic;

module_param(avic, bool, 0444);



static bool force_avic;

module_param_unsafe(force_avic, bool, 0444);



bool __read_mostly dump_invalid_vmcb;

module_param(dump_invalid_vmcb, bool, 0644);
@@ -4813,9 +4816,13 @@ static __init int svm_hardware_setup(void) 
			nrips = false;

	}



	enable_apicv = avic = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC);

	enable_apicv = avic = avic && npt_enabled && (boot_cpu_has(X86_FEATURE_AVIC) || force_avic);



	if (enable_apicv) {

		if (!boot_cpu_has(X86_FEATURE_AVIC)) {

			pr_warn("AVIC is not supported in CPUID but force enabled");

			pr_warn("Your system might crash and burn");

		} else

			pr_info("AVIC enabled\n");



		amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);