Re: [Qemu-devel] Re: [PATCH 3/3] Add KVM support to QEMU

[Avi Kivity]

Hollis Blanchard wrote:
> On Tue, Oct 28, 2008 at 6:36 PM, Anthony Liguori <address@hidden> wrote:
>   
> > Something I was thinking about this morning, and I think the first place
> > where we'll definitely need a hook, is how to deal with
> > kvm_load_registers().  I think there's overlap between KVM and the IO thread
> > here.
> >
> > There are two reasons (I can think of) that most of the device model code
> > can't run in conjunction with TCG.  The first is that TCG may modify
> > CPUState in a non-atomic way.  The device model may need to access CPUState
> > although there are very few places that it does.
> >     
>
> Out of curiosity, where are those places?
>   

local apic -- needs to access interrupt disable flag
acpi sleep -- halts the current processor, so tied to cpustate
vmport -- bad ABI requires access to registers

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