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SubjectRe: [PATCH 3.12 81/88] KVM: x86: expose invariant tsc cpuid bit (v2)
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On 14/07/2016 10:16, Jiri Slaby wrote:
> From: Marcelo Tosatti <mtosatti@redhat.com>
>
> 3.12-stable review patch. If anyone has any objections, please let me know.

Why stable? The commit is in 3.16, but AFAICS it never went into other
stable kernels.

Paolo

> ===============
>
> commit e4c9a5a17567f8ea975bdcfdd1bf9d63965de6c9 upstream.
>
> Invariant TSC is a property of TSC, no additional
> support code necessary.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
> ---
> arch/x86/kvm/cpuid.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index b132551528e5..6620ac307215 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -437,6 +437,13 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
> entry->ecx &= kvm_supported_word6_x86_features;
> cpuid_mask(&entry->ecx, 6);
> break;
> + case 0x80000007: /* Advanced power management */
> + /* invariant TSC is CPUID.80000007H:EDX[8] */
> + entry->edx &= (1 << 8);
> + /* mask against host */
> + entry->edx &= boot_cpu_data.x86_power;
> + entry->eax = entry->ebx = entry->ecx = 0;
> + break;
> case 0x80000008: {
> unsigned g_phys_as = (entry->eax >> 16) & 0xff;
> unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
> @@ -467,7 +474,6 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
> case 3: /* Processor serial number */
> case 5: /* MONITOR/MWAIT */
> case 6: /* Thermal management */
> - case 0x80000007: /* Advanced power management */
> case 0xC0000002:
> case 0xC0000003:
> case 0xC0000004:
>

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