Re: [PATCH 9/9] KVM: x86: smsw emulation is incorrect in 64-bit mode

From: H. Peter Anvin
Date: Thu Jun 05 2014 - 11:04:47 EST


On 06/05/2014 08:02 AM, Nadav Amit wrote:
>> I'm sorry, I'm missing the place where 64-bit mode is taken into account?
> It is not, since on 32-bit mode the high-order 16 bits of a register destination are undefined.
> If I recall correctly, in this case the high-order 16-bits on native
system actually reflect the high-order 16-bits of CR0.

This sounds like something that really should be verified
experimentally. The above claim seems... odd.

-hpa


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