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KVM: PPC: Book3S HV P9: Optimise hash guest SLB saving
authorNicholas Piggin <npiggin@gmail.com>
Tue, 23 Nov 2021 09:52:24 +0000 (19:52 +1000)
committerMichael Ellerman <mpe@ellerman.id.au>
Wed, 24 Nov 2021 10:09:02 +0000 (21:09 +1100)
commit89e265e715a0a1bd53003a8721c0135e30e1e44e
tree5d63136f9c86a397037e13b55ccf2837267e6593tree | snapshot
parent35ccdcb7785fcb14e71a819c0a581b21bf97ea6ccommit | diff
KVM: PPC: Book3S HV P9: Optimise hash guest SLB saving

slbmfee/slbmfev instructions are very expensive, moreso than a regular
mfspr instruction, so minimising them significantly improves hash guest
exit performance. The slbmfev is only required if slbmfee found a valid
SLB entry.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-47-npiggin@gmail.com
arch/powerpc/kvm/book3s_hv_p9_entry.c diff | blob | history
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