Hi Dimitri,
On 29/09/15 18:00, Dimitri John Ledkov wrote:
> From: Arjan van de Ven
>
> with the TSC deadline timer feature, we don't need to calibrate the apic
> timers anymore, which saves more than 100 milliseconds of boot time.
>
> Signed-off-by: Arjan van de Ven
> Signed-off-by: Dimitri John Ledkov
> ---
> x86/cpuid.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/x86/cpuid.c b/x86/cpuid.c
> index c3b67d9..1d8bd23 100644
> --- a/x86/cpuid.c
> +++ b/x86/cpuid.c
> @@ -31,6 +31,9 @@ static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid)
> /* Set X86_FEATURE_HYPERVISOR */
> if (entry->index == 0)
> entry->ecx |= (1 << 31);
> +/* Set CPUID_EXT_TSC_DEADLINE_TIMER*/
> + if (entry->index == 0)
> + entry->ecx |= (1 << 24);
This can only be enabled if the kernel supports emulation of that
feature (reported via KVM_CAP_TSC_DEADLINE_TIMER)
(cf: Documentation/virtual/kvm/api.txt and respective QEMU code in
target-i386/kvm.c)
Cheers,
Andre.
> break;
> case 6:
> /* Clear X86_FEATURE_EPB */
>
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