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SubjectRe: [PATCH] KVM: X86: Call kvm_x86_ops.cpuid_update() after CPUIDs fully updated
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On 28/05/20 17:19, Xiaoyao Li wrote:
> kvm_x86_ops.cpuid_update() is used to update vmx/svm settings based on
> updated CPUID settings. So it's supposed to be called after CPUIDs are
> fully updated, not in the middle stage.
>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>

Are you seeing anything bad happening from this?

Paolo

> ---
> arch/x86/kvm/cpuid.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index cd708b0b460a..753739bc1bf0 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -208,8 +208,11 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
> vcpu->arch.cpuid_nent = cpuid->nent;
> cpuid_fix_nx_cap(vcpu);
> kvm_apic_set_version(vcpu);
> - kvm_x86_ops.cpuid_update(vcpu);
> r = kvm_update_cpuid(vcpu);
> + if (r)
> + goto out;
> +
> + kvm_x86_ops.cpuid_update(vcpu);
>
> out:
> vfree(cpuid_entries);
> @@ -231,8 +234,11 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
> goto out;
> vcpu->arch.cpuid_nent = cpuid->nent;
> kvm_apic_set_version(vcpu);
> - kvm_x86_ops.cpuid_update(vcpu);
> r = kvm_update_cpuid(vcpu);
> + if (r)
> + goto out;
> +
> + kvm_x86_ops.cpuid_update(vcpu);
> out:
> return r;
> }
>

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