powerpc/64s: idle POWER9 can execute stop in virtual mode

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The hardware can execute stop in any context, and KVM does not
require real mode because siblings do not share MMU state. This
saves a switch to real-mode when going idle.

Acked-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2017-08-25 14:30:35 +10:00 • committed by Michael Ellerman

parent 65dbbe812f

commit 72b0d51d97

1 changed files with 9 additions and 0 deletions

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arch/powerpc/kernel/idle_book3s.S

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