These patches might be responsible for some instability in one of our
stress tests. I'll send an update once I figure out what's going on.

Thanks,
David

On Thu, Jan 28, 2021 at 9:48 PM Paolo Bonzini [off-list ref] wrote:

On 28/01/21 07:05, David Stevens wrote:

quoted

These patches reduce how often mmu_notifier updates block guest page
faults. The primary benefit of this is the reduction in the likelihood
of extreme latency when handling a page fault due to another thread
having been preempted while modifying host virtual addresses.

v2 -> v3:
  - Added patch to skip check for MMIO page faults
  - Style changes

David Stevens (1):
   KVM: x86/mmu: Consider the hva in mmu_notifier retry

Sean Christopherson (1):
   KVM: x86/mmu: Skip mmu_notifier check when handling MMIO page fault

  arch/powerpc/kvm/book3s_64_mmu_hv.c    |  2 +-
  arch/powerpc/kvm/book3s_64_mmu_radix.c |  2 +-
  arch/x86/kvm/mmu/mmu.c                 | 16 ++++++++------
  arch/x86/kvm/mmu/paging_tmpl.h         |  7 ++++---
  include/linux/kvm_host.h               | 25 +++++++++++++++++++++-
  virt/kvm/kvm_main.c                    | 29 ++++++++++++++++++++++----
  6 files changed, 65 insertions(+), 16 deletions(-)

Queued, thanks.

Paolo

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