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Re: [Qemu-devel] [PATCH 3/3] QEMU kvm/i386 : Adding KICK_VCPU capability
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From: |
Avi Kivity |
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Subject: |
Re: [Qemu-devel] [PATCH 3/3] QEMU kvm/i386 : Adding KICK_VCPU capability support in i386 target. |
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Date: |
Mon, 26 Dec 2011 16:07:53 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0 |
On 12/19/2011 04:11 PM, Jan Kiszka wrote:
> >>
> >> Backwards compatibility
> >
> > If we want backwards compatibility, we need more than just a simple feature
> > check, no? Oh, you feed that into CPUID? That's nifty. Ok, so you behave
> > like VMX/SVM do on real hardware - you always expose the functionality but
> > don't list it in CPUID for older user space.
>
> Do we want this to be on when providing a compat machine type ("pc-0.12"
> etc.) to the guest? Then it does need more work (see the dance around
> kvmclock).
We do. I have a feeling the whole cpuid stuff, paravirt and
non-paravirt, needs some fixing in this area. It's different than the
normal compat code since not only qemu, but also kvm and the host cpu
have a say in what's supported and what's not.
--
error compiling committee.c: too many arguments to function