From patchwork Sun May 6 14:20:51 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [07/16] KVM: PPC: Book3S: PR: No isync in slbie path From: Alexander Graf X-Patchwork-Id: 157082 Message-Id: <1336314060-32640-8-git-send-email-agraf@suse.de> To: kvm-ppc Cc: kvm list , Avi Kivity Date: Sun, 6 May 2012 16:20:51 +0200 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 --- arch/powerpc/kvm/book3s_64_slb.S | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_slb.S b/arch/powerpc/kvm/book3s_64_slb.S index f2e6e48..56b983e 100644 --- a/arch/powerpc/kvm/book3s_64_slb.S +++ b/arch/powerpc/kvm/book3s_64_slb.S @@ -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)