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Re: [kvm-devel] [Qemu-devel] expose host CPU features to guests: Take 3

From: Avi Kivity
Subject: Re: [kvm-devel] [Qemu-devel] expose host CPU features to guests: Take 3
Date: Tue, 25 Sep 2007 11:01:06 +0200
User-agent: Thunderbird (X11/20070719)

Dan Kenigsberg wrote:
> On Tue, Sep 25, 2007 at 03:28:24AM +0200, andrzej zaborowski wrote:
>> Hi,
>> On 24/09/2007, Dan Kenigsberg <address@hidden> wrote:
>>> As with previous "Takes" of this patch, its purpose is to expose host
>>> +{
>>> +    asm("cpuid"
>>> +        : "=a" (*ax),
>>> +          "=b" (*bx),
>>> +          "=c" (*cx),
>>> +          "=d" (*dx)
>>> +        : "a" (function));
>>> +}
>> I haven't really read through the rest of your code but this piece
>> appears to be outside any #ifdef/#endif so it will only build on x86.
> I might be missing something here, but isn't not being on the
> TARGET_PATH of Makefile.target enough? I don't see #ifdef TARGET_I386
> elsewhere under target-i386. I don't mind adding extra protection, I
> just be happy to better understand the whats and whys.

target-i386 means the guest will run i386 instructions, but the host can
be something else (say, powerpc).

Nothing else uses host instructions in that directory, so no protection
was necessary before.

Do not meddle in the internals of kernels, for they are subtle and quick to 

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