KVM: PPC: Book3S: PR: No isync in slbie path · af415087d2 - Gogs

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>

Alexander Graf 13 years ago

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8c2d0be7ef

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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)