Messages in this thread | | | Date | Mon, 09 Nov 2015 08:58:22 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH 2/3] context_tracking: avoid irq_save/irq_restore on guest entry and exit |
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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 <luto@kernel.org> > Cc: Frederic Weisbecker <fweisbec@gmail.com> > Cc: Rik van Riel <riel@redhat.com> > Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com> Tested-by: Rik van Riel <riel@redhat.com>
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