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This will allow using __walk_slot_rmaps() and thus cond_resched() to handle mmu_notifier invalidations, which usually allow blocking/yielding, but not when invoked by the OOM killer. Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 676cb7dfcbf9..a5a7e476f5bb 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1545,7 +1545,8 @@ static __always_inline bool __walk_slot_rmaps(struct kvm *kvm, slot_rmaps_handler fn, int start_level, int end_level, gfn_t start_gfn, gfn_t end_gfn, - bool flush_on_yield, bool flush) + bool can_yield, bool flush_on_yield, + bool flush) { struct slot_rmap_walk_iterator iterator; @@ -1556,6 +1557,9 @@ static __always_inline bool __walk_slot_rmaps(struct kvm *kvm, if (iterator.rmap) flush |= fn(kvm, iterator.rmap, slot); + if (!can_yield) + continue; + if (need_resched() || rwlock_needbreak(&kvm->mmu_lock)) { if (flush && flush_on_yield) { kvm_flush_remote_tlbs_range(kvm, start_gfn, @@ -1577,7 +1581,7 @@ static __always_inline bool walk_slot_rmaps(struct kvm *kvm, { return __walk_slot_rmaps(kvm, slot, fn, start_level, end_level, slot->base_gfn, slot->base_gfn + slot->npages - 1, - flush_on_yield, false); + true, flush_on_yield, false); } static __always_inline bool walk_slot_rmaps_4k(struct kvm *kvm, @@ -6528,7 +6532,7 @@ static bool kvm_rmap_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_e flush = __walk_slot_rmaps(kvm, memslot, __kvm_zap_rmap, PG_LEVEL_4K, KVM_MAX_HUGEPAGE_LEVEL, - start, end - 1, true, flush); + start, end - 1, true, true, flush); } } @@ -6816,7 +6820,7 @@ static void kvm_shadow_mmu_try_split_huge_pages(struct kvm *kvm, */ for (level = KVM_MAX_HUGEPAGE_LEVEL; level > target_level; level--) __walk_slot_rmaps(kvm, slot, shadow_mmu_try_split_huge_pages, - level, level, start, end - 1, true, false); + level, level, start, end - 1, true, true, false); } /* Must be called with the mmu_lock held in write-mode. */ -- 2.46.0.76.ge559c4bf1a-goog