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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2022-03-01 16:36:49 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 05:41:11 -0400 |
| commit | edf721238576544ed8daf9943ab398bb27da8e6b (patch) | |
| tree | 3139140539b522814c9c47c8448565dee21d70d0 /arch | |
| parent | b9f3973ab3a80141a6decc34f4740e6494ca7d51 (diff) | |
| download | linux-edf721238576544ed8daf9943ab398bb27da8e6b.tar.gz linux-edf721238576544ed8daf9943ab398bb27da8e6b.tar.bz2 linux-edf721238576544ed8daf9943ab398bb27da8e6b.zip | |
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: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220301143650.143749-7-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index af1706144bac..f1cb8e991749 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -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 { |