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

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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: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220301143650.143749-7-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky
2022-03-01 16:36:49 +02:00
committed by Paolo Bonzini
parent b9f3973ab3
commit edf7212385
1 changed files with 9 additions and 2 deletions
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11
arch/x86/kvm/svm/svm.c
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@@ -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);
@@ -4813,10 +4816,14 @@ 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) {
pr_info("AVIC enabled\n");
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);
} else {