On 10/27/2015 09:39 PM, Paolo Bonzini wrote:
> guest_enter and guest_exit must be called with interrupts disabled,
> since they take the vtime_seqlock with write_seq{lock,unlock}.
> Therefore, it is not necessary to check for exceptions, nor to
> save/restore the IRQ state, when context tracking functions are
> called by guest_enter and guest_exit.
>
> Split the body of context_tracking_entry and context_tracking_exit
> out to __-prefixed functions, and use them from KVM.
>
> Rik van Riel has measured this to speed up a tight vmentry/vmexit
> loop by about 2%.
>
> Cc: Andy Lutomirski <l...@kernel.org>
> Cc: Frederic Weisbecker <fweis...@gmail.com>
> Cc: Rik van Riel <r...@redhat.com>
> Cc: Paul McKenney <paul...@linux.vnet.ibm.com>
> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Reviewed-by: Rik van Riel <r...@redhat.com>
Tested-by: Rik van Riel <r...@redhat.com>
--
All rights reversed
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
