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KVM: PPC: Book3S HV P9: Improve mfmsr performance on entry
authorNicholas Piggin <npiggin@gmail.com>
Tue, 23 Nov 2021 09:52:23 +0000 (19:52 +1000)
committerMichael Ellerman <mpe@ellerman.id.au>
Wed, 24 Nov 2021 10:09:02 +0000 (21:09 +1100)
commitb49c65c5f9f1dac4ef1764578ad55bacf526eb38
tree2364d675b568228d7fe3c23c5b93a13b1c80f622tree | snapshot
parent46dea77f790c1e7ab2e9f7452e34de0dc5da9b13commit | diff
KVM: PPC: Book3S HV P9: Improve mfmsr performance on entry

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
arch/powerpc/include/asm/kvm_book3s_64.h diff | blob | history
arch/powerpc/kvm/book3s_hv.c diff | blob | history
arch/powerpc/kvm/book3s_hv_p9_entry.c diff | blob | history
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