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

Avi Kivity
2008-10-29T14:09:40Z

Hollis Blanchard wrote:
> On Tue, Oct 28, 2008 at 6:36 PM, Anthony Liguori <anthony@codemonkey.ws> 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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