KVM: PPC: Book3S HV P9: Improve mfmsr performance on entry

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Rearrange the MSR saving on entry so it does not follow the mtmsrd to
disable interrupts, avoiding a possible RAW scoreboard stall.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-46-npiggin@gmail.com

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Nicholas Piggin 2021-11-23 19:52:23 +10:00 • committed by Michael Ellerman

parent 46dea77f79

commit b49c65c5f9

3 changed files with 47 additions and 39 deletions

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2

arch/powerpc/include/asm/kvm_book3s_64.h

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18

arch/powerpc/kvm/book3s_hv.c

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66

arch/powerpc/kvm/book3s_hv_p9_entry.c

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