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powerpc/powernv: Fix problems in onlining CPUs

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At present, on the powernv platform, if you off-line a CPU that was
online, and then try to on-line it again, the kernel generates a
warning message "OPAL Error -1 starting CPU n".  Furthermore, if the
CPU is a secondary thread that was used by KVM while it was off-line,
the CPU fails to come online.

The first problem is fixed by only calling OPAL to start the CPU the
first time it is on-lined, as indicated by the cpu_start field of its
PACA being zero.  The second problem is fixed by restoring the
cpu_start field to 1 instead of 0 when using the CPU within KVM.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras
2011-12-05 19:35:32 +00:00
committed by Benjamin Herrenschmidt
parent 3339264042
commit cba313da5c
2 changed files with 2 additions and 2 deletions
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2
arch/powerpc/kernel/exceptions-64s.S
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@@ -65,7 +65,7 @@ BEGIN_FTR_SECTION
lbz r0,PACAPROCSTART(r13)
cmpwi r0,0x80
bne 1f
li r0,0
li r0,1
stb r0,PACAPROCSTART(r13)
b kvm_start_guest
1: