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| author | Xiaoyao Li <xiaoyao.li@intel.com> | 2020-07-08 14:50:48 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-08 16:22:00 -0400 |
| commit | 0d3b2ba16ba68612142399e1801e6aff3f184d3e (patch) | |
| tree | 28581b05c317b3840b00e220f07749343a54ac20 /arch/x86/kvm/cpuid.c | |
| parent | 18964092825aef6faaadf51fbc5fd166168ddf61 (diff) | |
| download | linux-0d3b2ba16ba68612142399e1801e6aff3f184d3e.tar.gz linux-0d3b2ba16ba68612142399e1801e6aff3f184d3e.tar.bz2 linux-0d3b2ba16ba68612142399e1801e6aff3f184d3e.zip | |
KVM: X86: Go on updating other CPUID leaves when leaf 1 is absent
As handling of bits out of leaf 1 added over time, kvm_update_cpuid()
should not return directly if leaf 1 is absent, but should go on
updateing other CPUID leaves.
Keep the update of apic->lapic_timer.timer_mode_mask in a separate
wrapper, to minimize churn for code since it will be moved out of this
function in a future patch.
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20200708065054.19713-3-xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index b7bbed0de636..f6f760d4800d 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -60,18 +60,17 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu) struct kvm_lapic *apic = vcpu->arch.apic; best = kvm_find_cpuid_entry(vcpu, 1, 0); - if (!best) - return 0; - - /* Update OSXSAVE bit */ - if (boot_cpu_has(X86_FEATURE_XSAVE) && best->function == 0x1) - cpuid_entry_change(best, X86_FEATURE_OSXSAVE, + if (best) { + /* Update OSXSAVE bit */ + if (boot_cpu_has(X86_FEATURE_XSAVE)) + cpuid_entry_change(best, X86_FEATURE_OSXSAVE, kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)); - cpuid_entry_change(best, X86_FEATURE_APIC, + cpuid_entry_change(best, X86_FEATURE_APIC, vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE); + } - if (apic) { + if (best && apic) { if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER)) apic->lapic_timer.timer_mode_mask = 3 << 17; else |