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

On 09/10/2015 16:53, Roman Kagan wrote:

quoted

quoted

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