KVM: x86/mmu: Pass the memslot around via struct kvm_page_fault

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The memslot for the faulting gfn is used throughout the page fault
handling code, so capture it in kvm_page_fault as soon as we know the
gfn and use it in the page fault handling code that has direct access
to the kvm_page_fault struct.  Replace various tests using is_noslot_pfn
with more direct tests on fault->slot being NULL.

This, in combination with the subsequent patch, improves "Populate
memory time" in dirty_log_perf_test by 5% when using the legacy MMU.
There is no discerable improvement to the performance of the TDP MMU.

No functional change intended.

Suggested-by: Ben Gardon <bgardon@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20210813203504.2742757-4-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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David Matlack 2021-09-24 05:05:26 -04:00 • committed by Paolo Bonzini

parent 6ccf443882

commit e710c5f6be

4 changed files with 20 additions and 23 deletions

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3

arch/x86/kvm/mmu.h

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32

arch/x86/kvm/mmu/mmu.c

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6

arch/x86/kvm/mmu/paging_tmpl.h

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2

arch/x86/kvm/mmu/tdp_mmu.c

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