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Re: [Qemu-devel] [PATCH] Qemu: Fix eax for cpuid leaf 0x40000000
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH] Qemu: Fix eax for cpuid leaf 0x40000000 |
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Date: |
Tue, 12 Aug 2014 21:12:00 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
Il 12/08/2014 20:55, Eduardo Habkost ha scritto:
> This makes the CPUID data change under the guest's feet during
> live-migration.
>
> Adding compat code to ensure older machine-types keep the old behavior
> is necessary, but in this specific case it is mostly harmless because
> 0x0 is documented as being equivalent to 0x40000001.
>
> (But I don't know how guests are supposed to behave when they see
> CPUID[KVM_CPUID_SIGNATURE_NEXT].EAX==0.)
The only obvious thing to do would be to treat it as 0x40000101.
Paolo