On 09/05/2016 11:53, Borislav Petkov wrote:
> From: Borislav Petkov <bp@xxxxxxx>
>
> Use already cached CPUID information instead of querying CPUID again.
>
> No functionality change.
>
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> Cc: Joerg Roedel <joro@xxxxxxxxxx>
> Cc: kvm@xxxxxxxxxxxxxxx
> Cc: x86@xxxxxxxxxx
> ---
> arch/x86/include/asm/svm.h | 1 -
> arch/x86/include/asm/virtext.h | 8 ++------
> 2 files changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
> index 6136d99f537b..41888f51f936 100644
> --- a/arch/x86/include/asm/svm.h
> +++ b/arch/x86/include/asm/svm.h
> @@ -185,7 +185,6 @@ struct __attribute__ ((__packed__)) vmcb {
> struct vmcb_save_area save;
> };
>
> -#define SVM_CPUID_FEATURE_SHIFT 2
> #define SVM_CPUID_FUNC 0x8000000a
>
> #define SVM_VM_CR_SVM_DISABLE 4
> diff --git a/arch/x86/include/asm/virtext.h b/arch/x86/include/asm/virtext.h
> index cce9ee68e335..0116b2ee9e64 100644
> --- a/arch/x86/include/asm/virtext.h
> +++ b/arch/x86/include/asm/virtext.h
> @@ -83,23 +83,19 @@ static inline void cpu_emergency_vmxoff(void)
> */
> static inline int cpu_has_svm(const char **msg)
> {
> - uint32_t eax, ebx, ecx, edx;
> -
> if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) {
> if (msg)
> *msg = "not amd";
> return 0;
> }
>
> - cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
> - if (eax < SVM_CPUID_FUNC) {
> + if (boot_cpu_data.extended_cpuid_level < SVM_CPUID_FUNC) {
> if (msg)
> *msg = "can't execute cpuid_8000000a";
> return 0;
> }
>
> - cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
> - if (!(ecx & (1 << SVM_CPUID_FEATURE_SHIFT))) {
> + if (!boot_cpu_has(X86_FEATURE_SVM)) {
> if (msg)
> *msg = "svm not available";
> return 0;
>
Queued, thanks.
Paolo
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