KVM: PPC: Book3S: Invalidate multiple TCEs at once

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Invalidating a TCE cache entry for each updated TCE is quite expensive.
This makes use of the new iommu_table_ops::xchg_no_kill()/tce_kill()
callbacks to bring down the time spent in mapping a huge guest DMA window;
roughly 20s to 10s for each guest's 100GB of DMA space.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190829085252.72370-3-aik@ozlabs.ru

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Alexey Kardashevskiy 2019-08-29 18:52:49 +10:00 • committed by Michael Ellerman

parent 35872480da

commit 01b7d128b5

2 changed files with 48 additions and 19 deletions

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29

arch/powerpc/kvm/book3s_64_vio.c

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38

arch/powerpc/kvm/book3s_64_vio_hv.c

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