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| author |   Ben Gardon <bgardon@google.com> | 2020-10-14 11:26:56 -0700 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2020-10-23 03:42:14 -0400 |
| commit | 14881998566d2dc0703870bbe063e8d42d780eb9 (patch) | |
| tree | c5fe7553fde8d6e1c9a73e2df9ba19daefb9aa47 /arch/x86/kvm/mmu/tdp_mmu.h | |
| parent | kvm: x86/mmu: Support dirty logging for the TDP MMU (diff) | |
| download | linux-dev-14881998566d2dc0703870bbe063e8d42d780eb9.tar.xz linux-dev-14881998566d2dc0703870bbe063e8d42d780eb9.zip | |
kvm: x86/mmu: Support disabling dirty logging for the tdp MMU
Dirty logging ultimately breaks down MMU mappings to 4k granularity.
When dirty logging is no longer needed, these granaular mappings
represent a useless performance penalty. When dirty logging is disabled,
search the paging structure for mappings that could be re-constituted
into a large page mapping. Zap those mappings so that they can be
faulted in again at a higher mapping level.
Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell
machine. This series introduced no new failures.
This series can be viewed in Gerrit at:
https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20201014182700.2888246-17-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/mmu/tdp_mmu.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h index ece66f10d85f..8cc902b8b9f8 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.h +++ b/arch/x86/kvm/mmu/tdp_mmu.h @@ -38,4 +38,6 @@ void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm, gfn_t gfn, unsigned long mask, bool wrprot); bool kvm_tdp_mmu_slot_set_dirty(struct kvm *kvm, struct kvm_memory_slot *slot); +void kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm, + const struct kvm_memory_slot *slot); #endif /* __KVM_X86_MMU_TDP_MMU_H */ |