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| author | Sean Christopherson <seanjc@google.com> | 2021-01-13 12:50:30 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 05:27:15 -0500 |
| commit | 8fc517267fb28576dfca2380cc2497a2454b8fae (patch) | |
| tree | 01cbf403da58e92d96d3789d81f66ca5ae2d1283 /samples | |
| parent | 15e6a7e5324cc04a67891fc369ea834bbb7e7b42 (diff) | |
| download | lwn-8fc517267fb28576dfca2380cc2497a2454b8fae.tar.gz lwn-8fc517267fb28576dfca2380cc2497a2454b8fae.zip | |
KVM: x86: Zap the oldest MMU pages, not the newest
Walk the list of MMU pages in reverse in kvm_mmu_zap_oldest_mmu_pages().
The list is FIFO, meaning new pages are inserted at the head and thus
the oldest pages are at the tail. Using a "forward" iterator causes KVM
to zap MMU pages that were just added, which obliterates guest
performance once the max number of shadow MMU pages is reached.
Fixes: 6b82ef2c9cf1 ("KVM: x86/mmu: Batch zap MMU pages when recycling oldest pages")
Reported-by: Zdenek Kaspar <zkaspar82@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210113205030.3481307-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions