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KVM: PPC: Book3S: PR: No isync in slbie path
authorAlexander Graf <agraf@suse.de>
Wed, 25 Apr 2012 12:29:57 +0000 (14:29 +0200)
committerAlexander Graf <agraf@suse.de>
Sun, 6 May 2012 14:19:09 +0000 (16:19 +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 <agraf@suse.de>
arch/powerpc/kvm/book3s_64_slb.S patch | blob | history

diff --git a/arch/powerpc/kvm/book3s_64_slb.S b/arch/powerpc/kvm/book3s_64_slb.S
index f2e6e48..56b983e 100644 (file)
--- 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)
Domain: System / Uncategorized;