On Wed, Jun 20, 2012 at 10:37 AM, Cyrill Gorcunov <gorcunov@xxxxxxxxxx> wrote:
> From: Sasha Levin <levinsasha928@xxxxxxxxx>
> Subject: [PATCH] kvm tools: set the HYPERVISOR flag in cpuid
>
> We need to set the HYPERVISOR flag to let the kernel know we're running
> under a hypervisor.
>
> This makes the kernel enable all sorts of para-virtualization options
> such as kvm-clock.
>
> Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
> [gorcunov@: Add comments on bits]
> Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> ---
> tools/kvm/x86/cpuid.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> Index: linux-2.6.git/tools/kvm/x86/cpuid.c
> ===================================================================
> --- linux-2.6.git.orig/tools/kvm/x86/cpuid.c
> +++ linux-2.6.git/tools/kvm/x86/cpuid.c
> @@ -21,8 +21,13 @@ static void filter_cpuid(struct kvm_cpui
> struct kvm_cpuid_entry2 *entry = &kvm_cpuid->entries[i];
>
> switch (entry->function) {
> + case 1:
> + /* Set X86_FEATURE_HYPERVISOR */
> + if (entry->index == 0)
> + entry->ecx |= (1 << 31);
> + break;
> case 6:
> - /* Clear presence of IA32_ENERGY_PERF_BIAS */
> + /* Clear X86_FEATURE_EPB */
> entry->ecx = entry->ecx & ~(1 << 3);
> break;
> case CPUID_FUNC_PERFMON:
I applied the patch. Thanks!
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