powerpc/64s: Keep AMOR SPR a constant ~0 at runtime

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This register controls supervisor SPR modifications, and as such is only
relevant for KVM. KVM always sets AMOR to ~0 on guest entry, and never
restores it coming back out to the host, so it can be kept constant and
avoid the mtSPR in KVM guest entry.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-10-npiggin@gmail.com

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Nicholas Piggin 2021-11-23 19:51:47 +10:00 • committed by Michael Ellerman

parent eacc818864

commit 46f9caf1a2

6 changed files with 13 additions and 24 deletions

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8

arch/powerpc/kernel/cpu_setup_power.c

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2

arch/powerpc/kernel/dt_cpu_ftrs.c

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2

arch/powerpc/kvm/book3s_hv_p9_entry.c

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2

arch/powerpc/kvm/book3s_hv_rmhandlers.S

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15

arch/powerpc/mm/book3s64/radix_pgtable.c

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8

arch/powerpc/platforms/powernv/idle.c

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