Messages in this thread | | | Subject | Re: [PATCH v2 6/7] KVM: X86: Move kvm_x86_ops.update_vcpu_model() into kvm_update_vcpu_model() | From | Xiaoyao Li <> | Date | Fri, 3 Jul 2020 06:29:58 +0800 |
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On 7/3/2020 2:59 AM, Sean Christopherson wrote: > On Tue, Jun 23, 2020 at 07:58:15PM +0800, Xiaoyao Li wrote: >> kvm_x86_ops.update_vcpu_model() is used to update vmx/svm vcpu settings >> based on updated CPUID settings. So it's supposed to be called after >> CPUIDs are fully updated, i.e., kvm_update_cpuid(). >> >> Move it in kvm_update_vcpu_model(). > > The changelog needs to provide an in-depth analysis of VMX and SVM to prove > that there are no existing dependencies in the ordering. I've done the > analysis a few times over the past few years for a similar chage I carried > in my SGX code, but dropped that code a while back and haven't done the > analysis since. Anyways, it should be documented.
No problem. Will add the analysis in next version.
>> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com> >> --- >> --- >> arch/x86/kvm/cpuid.c | 5 +++-- >> 1 file changed, 3 insertions(+), 2 deletions(-) >> >> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c >> index d2f93823f9fd..5decc2dd5448 100644 >> --- a/arch/x86/kvm/cpuid.c >> +++ b/arch/x86/kvm/cpuid.c >> @@ -121,6 +121,8 @@ void kvm_update_vcpu_model(struct kvm_vcpu *vcpu) >> struct kvm_lapic *apic = vcpu->arch.apic; >> struct kvm_cpuid_entry2 *best; >> >> + kvm_x86_ops.update_vcpu_model(vcpu); >> + >> best = kvm_find_cpuid_entry(vcpu, 1, 0); >> if (best && apic) { >> if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER)) >> @@ -136,6 +138,7 @@ void kvm_update_vcpu_model(struct kvm_vcpu *vcpu) >> vcpu->arch.guest_supported_xcr0 = >> (best->eax | ((u64)best->edx << 32)) & supported_xcr0; >> >> + > > Spurious whitespace. > >> /* Note, maxphyaddr must be updated before tdp_level. */ >> vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu); >> vcpu->arch.tdp_level = kvm_x86_ops.get_tdp_level(vcpu); >> @@ -224,7 +227,6 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, >> >> cpuid_fix_nx_cap(vcpu); >> kvm_apic_set_version(vcpu); >> - kvm_x86_ops.update_vcpu_model(vcpu); >> kvm_update_cpuid(vcpu); >> kvm_update_vcpu_model(vcpu); >> >> @@ -254,7 +256,6 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, >> } >> >> kvm_apic_set_version(vcpu); >> - kvm_x86_ops.update_vcpu_model(vcpu); >> kvm_update_cpuid(vcpu); >> kvm_update_vcpu_model(vcpu); >> out: >> -- >> 2.18.2 >>
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