Re: [Qemu-devel] [PATCH 2/2] kvm/x86: Hyper-V kvm exit

[Paolo Bonzini]

On 09/10/2015 16:53, Roman Kagan wrote:
>> > Why is this exit necessary?
> The guest writes to synic-related MSRs and that should take "immediate"
> effect.
> 
> E.g. it may decide to disable or relocate the message page by writing to
> SIMP MSR.  The host is then supposed to stop accessing the old message
> page before the vCPU proceeds to the next instruction.  Hence the exit,
> to allow the userspace to react accordingly before reentering the guest.

Ok, thanks!

Paolo