]> Git Repo - linux.git/commit
KVM: x86/mmu: Zap only the relevant pages when removing a memslot
authorSean Christopherson <[email protected]>
Tue, 5 Feb 2019 21:01:21 +0000 (13:01 -0800)
committerPaolo Bonzini <[email protected]>
Wed, 20 Feb 2019 21:48:39 +0000 (22:48 +0100)
commit4e103134b862314dc2f2f18f2fb0ab972adc3f5f
treedccc458d31608d0d922d8af8265bdf938dc35e23
parenta21136345cb6f1a5b7f576701b6a454da5b6e606
KVM: x86/mmu: Zap only the relevant pages when removing a memslot

Modify kvm_mmu_invalidate_zap_pages_in_memslot(), a.k.a. the x86 MMU's
handler for kvm_arch_flush_shadow_memslot(), to zap only the pages/PTEs
that actually belong to the memslot being removed.  This improves
performance, especially why the deleted memslot has only a few shadow
entries, or even no entries.  E.g. a microbenchmark to access regular
memory while concurrently reading PCI ROM to trigger memslot deletion
showed a 5% improvement in throughput.

Cc: Xiao Guangrong <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
arch/x86/kvm/mmu.c
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