Messages in this thread | | | Date | Wed, 19 Sep 2012 10:26:06 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 3/6] x86, kvm: use kernel_fpu_begin/end() in kvm_load/put_guest_fpu() |
| |
On 09/19/2012 10:22 AM, Avi Kivity wrote: > > Note, we could also go in a different direction and make > kernel_fpu_begin() use preempt notifiers and thus make its users > preemptible. But that's for a separate patchset. >
Where would you put the state if you were preempted? You want to allocate a full extra buffer for the kernel xstate for each thread just in case? ("Yes" is a valid answer to that question, but it is a fair chunk of memory.)
-hpa
| |