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KVM: x86/mmu: Revert "Revert "KVM: MMU: reclaim the zapped-obsolete page first""

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Now that the fast invalidate mechanism has been reintroduced, restore
the performance tweaks for fast invalidation that existed prior to its
removal.

Paraphrashing the original changelog:

  Introduce a per-VM list to track obsolete shadow pages, i.e. pages
  which have been deleted from the mmu cache but haven't yet been freed.
  When page reclaiming is needed, zap/free the deleted pages first.

This reverts commit 52d5dedc79.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-09-12 19:46:09 -07:00 committed by Paolo Bonzini
parent 4506ecf485
commit 31741eb11a
1 changed files with 1 additions and 0 deletions
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arch/x86/include/asm/kvm_host.h
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@ -865,6 +865,7 @@ struct kvm_arch {
* Hash table of struct kvm_mmu_page.
*/
struct list_head active_mmu_pages;
struct list_head zapped_obsolete_pages;
struct kvm_page_track_notifier_node mmu_sp_tracker;
struct kvm_page_track_notifier_head track_notifier_head;