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Re: [Qemu-devel] [PATCH v3] target-i386: emulate CPUID level of real har
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From: |
Eduardo Habkost |
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Subject: |
Re: [Qemu-devel] [PATCH v3] target-i386: emulate CPUID level of real hardware |
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Date: |
Mon, 29 Jun 2015 16:18:05 -0300 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Mon, Jun 22, 2015 at 01:08:02PM +0200, Radim Krčmář wrote:
> W10 insider has a bug where it ignores CPUID level and interprets
> CPUID.(EAX=07H, ECX=0H) incorrectly, because CPUID in fact returned
> CPUID.(EAX=04H, ECX=0H); this resulted in execution of unsupported
> instructions.
>
> While it's a Windows bug, there is no reason to emulate incorrect level.
>
> I used http://instlatx64.atw.hu/ as a source of CPUID and checked that
> it matches Penryn Xeon X5472, Westmere Xeon W3520, SandyBridge i5-2540M,
> and Haswell i5-4670T.
>
> kvm64 and qemu64 were bumped to 0xD to allow all available features for
> them (and to avoid the same Windows bug).
>
> Signed-off-by: Radim Krčmář <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
Applied to the x86 tree, thanks.
--
Eduardo