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

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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>
This commit is contained in:
Alexander Graf 2012-04-25 14:29:57 +02:00
parent 8c2d0be7ef
commit af415087d2
1 changed files with 0 additions and 2 deletions
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arch/powerpc/kvm/book3s_64_slb.S
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@ -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)