KVM: x86/mmu: Voluntarily reschedule as needed when zapping MMIO sptes

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Call cond_resched_lock() when zapping MMIO to reschedule if needed or to
release and reacquire mmu_lock in case of contention.  There is no need
to flush or zap when temporarily dropping mmu_lock as zapping MMIO sptes
is done when holding the memslots lock and with the "update in-progress"
bit set in the memslots generation, which disables MMIO spte caching.
The walk does need to be restarted if mmu_lock is dropped as the active
pages list may be modified.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2019-02-05 13:01:24 -08:00 • committed by Paolo Bonzini

parent 4771450c34

commit 571c5af06e

1 changed files with 2 additions and 1 deletions

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arch/x86/kvm/mmu.c

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