kvm: x86: mmu: Fast Page Fault path retries

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This change adds retries into the Fast Page Fault path. Without the
retries, the code still works, but if a retry does end up being needed,
then it will result in a second page fault for the same memory access,
which will cause much more overhead compared to just retrying within the
original fault.

This would be especially useful with the upcoming fast access tracking
change, as that would make it more likely for retries to be needed
(e.g. due to read and write faults happening on different CPUs at
the same time).

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Junaid Shahid 2016-12-06 16:46:12 -08:00 • committed by Radim Krčmář

parent ea4114bcd3

commit 97dceba29a

1 changed files with 73 additions and 51 deletions

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arch/x86/kvm/mmu.c

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