Commit af415087 authored Apr 25, 2012 by Alexander Graf

KVM: PPC: Book3S: PR: No isync in slbie path

While messing around with the SLBs we're running in real mode. The
entry to guest space goes through rfid, which is context synchronizing,
so there's no need to manually synchronize anything through isync.

With this patch and a simple priviledged SPR access loop guest, I get
a speed bump from 2035607 to 2181301 exits per second.

Signed-off-by: Alexander Graf <agraf@suse.de>

parent 8c2d0be7

arch/powerpc/kvm/book3s_64_slb.S

+0 −2

Original line number	Diff line number	Diff line
		@@ -90,8 +90,6 @@ slb_exit_skip_ ## num:
		or r10, r10, r12
		slbie r10

		isync

		/* Fill SLB with our shadow */

		lbz r12, SVCPU_SLB_MAX(r3)