Commit 1e203847 authored by Hou Wenlong's avatar Hou Wenlong Committed by Sean Christopherson
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KVM: x86/mmu: Reduce gfn range of tlb flushing in tdp_mmu_map_handle_target_level() 



Since the children SP is zapped, the gfn range of tlb flushing should be
the range covered by children SP not parent SP. Replace sp->gfn which is
the base gfn of parent SP with iter->gfn and use the correct size of gfn
range for children SP to reduce tlb flushing range.

Fixes: bb95dfb9 ("KVM: x86/mmu: Defer TLB flush to caller when freeing TDP MMU shadow pages")
Signed-off-by: default avatarHou Wenlong <houwenlong.hwl@antgroup.com>
Reviewed-by: default avatarDavid Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/528ab9c784a486e9ce05f61462ad9260796a8732.1665214747.git.houwenlong.hwl@antgroup.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 9ffe9265

arch/x86/kvm/mmu/tdp_mmu.c

+1 −2
Original line number Diff line number Diff line
@@ -1080,8 +1080,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, 
		return RET_PF_RETRY;

	else if (is_shadow_present_pte(iter->old_spte) &&

		 !is_last_spte(iter->old_spte, iter->level))

		kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,

						   KVM_PAGES_PER_HPAGE(iter->level + 1));

		kvm_flush_remote_tlbs_gfn(vcpu->kvm, iter->gfn, iter->level);



	/*

	 * If the page fault was caused by a write but the page is write