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Re: [Qemu-devel] [patch] kvm: also fill 0x40000000 (vmm) cpuid leafes.
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [patch] kvm: also fill 0x40000000 (vmm) cpuid leafes. |
Date: |
Tue, 11 Nov 2008 22:30:36 +0100 |
User-agent: |
Thunderbird 2.0.0.16 (X11/20080723) |
Anthony Liguori wrote:
> Gerd Hoffmann wrote:
>> Hi,
>>
>> $subject says all, patch attached.
>>
>
> It really doesn't :-)
>
> 0x4000xxxx are the virtualization leaves, that we don't set so there is
> no functional change from this patch.
Not yet. For now it hasn't any effect. I can keep it in my patch queue
until I submit the patches depending on that one. But I expect more
users that xenner, so I thought it might be useful for others too and
submitted it right away ...
> The KVM PV ABI doesn't use eax as
> the max CPUID leaf of 0x40000000 so that's at least one example of them
> not behaving like this.
Oops. I think we should fix it then to follow the usual eax convention.
Xenner (standalone version, not qemu-integrated) actually does that and
sets eax to KVM_CPUID_FEATURES.
> So can you be a lot more specific about how you intend on using these
> leaves?
qemu-integrated xenner can handle full virtualized guests with xen pv
drivers installed. Must provide xen virt cpuid leaves then.
cheers,
Gerd