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SubjectRe: [PATCH 3/4] kvm: cpuid: fix xsave area size of XSAVEC


On 04/12/2014 09:24, Wanpeng Li wrote:
> XSAVEC also use the compacted format for the extended region
> of the XSAVE area. This patch fix it by caculate the size of
> XSAVEC extended region of XSAVE area as compact format.
>
> Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
> ---
> arch/x86/kvm/cpuid.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 70f0fa1..e16a0c7 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -92,7 +92,7 @@ int kvm_update_cpuid(struct kvm_vcpu *vcpu)
> }
>
> best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
> - if (best && (best->eax & F(XSAVES)))
> + if (best && (best->eax & (F(XSAVES) || F(XSAVEC))))

"|" instead of "||" as mentioned by Nadav.

Is the Intel manual implicitly relying on the fact that there is no
processor that has XSAVES but not XSAVEC?

Paolo

> best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
>
> /*
>


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