Re: qemu-kvm: do not allow vcpu stop with in progress PIO

Avi Kivity
2010-02-10T17:01:50Z

On 02/10/2010 06:52 PM, Alexander Graf wrote:
>
> Hrm, trying to read the thread I'm still somewhat lost. What exactly do
> you want to document?
>
>

The problem: if KVM_RUN exits with KVM_EXIT_MMIO or KVM_EXIT_IO, then
the internal state is inconsistent. The instruction is only half
completed, and we need to reissue KVM_RUN to complete it.

However, if we're migrating, then we don't want to execute any more
guest code. Luckily, if you KVM_RUN with a pending signal, then the
pending mmio or io will be completed, and then, if the pending signal is
unmasked in kvm's signal mask, KVM_RUN will exit immediately.

I would like to document the fact that the signal check happens between
the mmio completion and guest entry, and the above sequence as a way to
get consistent state after mmio.

--
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