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[v2,10/10] KVM: x86/mmu: Allow yielding during MMU notifier unmap/zap, if possible

Message ID 20210402005658.3024832-11-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: Consolidate and optimize MMU notifiers | expand

Commit Message

Sean Christopherson April 2, 2021, 12:56 a.m. UTC
Let the TDP MMU yield when unmapping a range in response to a MMU
notification, if yielding is allowed by said notification.  There is no
reason to disallow yielding in this case, and in theory the range being
invalidated could be quite large.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
 arch/x86/kvm/mmu/tdp_mmu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 7797d24f0937..dd17d9673ff2 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -885,7 +885,7 @@  bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
 	for_each_tdp_mmu_root(kvm, root, range->slot->as_id)
 		flush |= zap_gfn_range(kvm, root, range->start, range->end,
-				       false, flush);
+				       range->may_block, flush);
 	return flush;
@@ -903,6 +903,10 @@  static __always_inline bool kvm_tdp_mmu_handle_gfn(struct kvm *kvm,
+	/*
+	 * Don't support rescheduling, none of the MMU notifiers that funnel
+	 * into this helper allow blocking; it'd be dead, wasteful code.
+	 */
 	for_each_tdp_mmu_root(kvm, root, range->slot->as_id) {
 		tdp_root_for_each_leaf_pte(iter, root, range->start, range->end)
 			ret |= handler(kvm, &iter, range);