powerpc/kvm: Remove redundant save of SIER AND MMCR2
authorJoel Stanley <joel@jms.id.au>
Tue, 8 Jul 2014 06:38:20 +0000 (16:08 +0930)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 11 Jul 2014 02:55:07 +0000 (12:55 +1000)
commitf73128f4f680e8be68cda831f2710214559583cb
treef8a4f75ad45cfd8d6efe97bf7d17c6ae1554fee5
parentc733cf83bbd2b0978456822cdac8c726085dcc14
powerpc/kvm: Remove redundant save of SIER AND MMCR2

These two registers are already saved in the block above. Aside from
being unnecessary, by the time we get down to the second save location
r8 no longer contains MMCR2, so we are clobbering the saved value with
PMC5.

MMCR2 primarily consists of counter freeze bits. So restoring the value
of PMC5 into MMCR2 will most likely have the effect of freezing
counters.

Fixes: 72cde5a88d37 ("KVM: PPC: Book3S HV: Save/restore host PMU registers that are new in POWER8")
Cc: stable@vger.kernel.org
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/kvm/book3s_hv_interrupts.S