On 04/12/2014 09:24, Wanpeng Li wrote:
> The section of CPUID(EAX=0xd, ECX=1) in the spec which commit
> f5c2290cd01e (KVM: cpuid: mask more bits in leaf 0xd and subleaves)
> mentioned is older than SDM.
>
> EBX: Bits 31-00: The size in bytes of the XSAVE area containing all
> states enabled by XCR0|IA32_XSS.
>
> The the value of EBX should represent the size of XCR0 related XSAVE
> area since IA32_XSS is not used currently.
>
> Signed-off-by: Wanpeng Li <wanpeng...@linux.intel.com>
> ---
> arch/x86/kvm/cpuid.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 646e6e8..70f0fa1 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -477,7 +477,10 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2
> *entry, u32 function,
> do_cpuid_1_ent(&entry[i], function, idx);
> if (idx == 1) {
> entry[i].eax &=
> kvm_supported_word10_x86_features;
> - entry[i].ebx = 0;
> + if (entry[i].eax & F(XSAVES))
> + entry[i].ebx =
> xstate_required_size(supported, true);
> + else
> + entry[i].ebx =
> xstate_required_size(supported, false);
On machines without XSAVES, this value is zero though.
Paolo
> } else {
> if (entry[i].eax == 0 || !(supported & mask))
> continue;
>
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