linux-kernel - Re: [PATCH 3/4] kvm: cpuid: fix xsave area size of XSAVEC

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Date:	Thu, 04 Dec 2014 16:54:50 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Nadav Amit <nadav.amit@...il.com>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
CC:	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] kvm: cpuid: fix xsave area size of XSAVEC

Hi Nadav,
On 12/4/14, 4:30 PM, Nadav Amit wrote:
> Wanpeng Li <wanpeng.li@...ux.intel.com> 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@...ux.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))))
> Did you want to use | (bitwise or) instead of II (logical or) ?

I make a mistake here, I will fix it in next version.

Regards,
Wanpeng Li

>
>> 		best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
>>
>> 	/*
>> -- 
>> 1.9.1
>>
>> --
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> Nadav
> --
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