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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/mmu.c | |
| parent | a6a0b05da9f37ff56faa6b8351ed6e0b55032460 (diff) | |
| download | lwn-14881998566d2dc0703870bbe063e8d42d780eb9.tar.gz lwn-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 'arch/x86/kvm/mmu/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 0c64643819b9..cd1be200e2a3 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -5544,6 +5544,9 @@ void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm, spin_lock(&kvm->mmu_lock); slot_handle_leaf(kvm, (struct kvm_memory_slot *)memslot, kvm_mmu_zap_collapsible_spte, true); + + if (kvm->arch.tdp_mmu_enabled) + kvm_tdp_mmu_zap_collapsible_sptes(kvm, memslot); spin_unlock(&kvm->mmu_lock); } |