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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