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Re: [Qemu-devel] v2: KVM: support for 'count' in CPUID functions 4, 0xb


From: Amit Shah
Subject: Re: [Qemu-devel] v2: KVM: support for 'count' in CPUID functions 4, 0xb and 0xd.
Date: Tue, 13 Jan 2009 16:36:12 +0530
User-agent: Mutt/1.5.18 (2008-05-17)

On Tue, Jan 13, 2009 at 02:40:53PM +0530, Amit Shah wrote:
> On Tue, Jan 13, 2009 at 09:25:32AM +0100, Alexander Graf wrote:

> > For exactly this purpose KVM_SET_CPUID2 was introduced quite a while  
> > ago, enabling support for all CPUID leaf flavors on the kernel side.  
> > Merely the userspace call is missing.
> 
> We can do without using SET_CPUID2 (and hence not needing to do any
> trickery for kernel-userspace version mismatches).

Avi points out that we can use SET_CPUID2 without version mismatches
because it was introduced in 2.6.25 and that is the min. kernel
requirement for userspace, so I'll send out a v3 that uses the
SET_CPUID2 interface and the kernel patches won't be necessary in that
case.

Amit




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