linux-kernel - [PATCH 5.15 077/230] KVM: x86/mmu: Use yield-safe TDP MMU root iter in MMU notifier unmapping

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Message-Id: <20220711090606.260747828@linuxfoundation.org>
Date:   Mon, 11 Jul 2022 11:05:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 077/230] KVM: x86/mmu: Use yield-safe TDP MMU root iter in MMU notifier unmapping

From: Sean Christopherson <seanjc@...gle.com>

[ Upstream commit 7533377215b6ee432c06c5855f6be5d66e694e46 ]

Use the yield-safe variant of the TDP MMU iterator when handling an
unmapping event from the MMU notifier, as most occurences of the event
allow yielding.

Fixes: e1eed5847b09 ("KVM: x86/mmu: Allow yielding during MMU notifier unmap/zap, if possible")
Cc: stable@...r.kernel.org
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Message-Id: <20211120015008.3780032-1-seanjc@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 853780eb033b..6195f0d219ae 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1100,7 +1100,7 @@ bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
 {
 	struct kvm_mmu_page *root;
 
-	for_each_tdp_mmu_root(kvm, root, range->slot->as_id)
+	for_each_tdp_mmu_root_yield_safe(kvm, root, range->slot->as_id, false)
 		flush = zap_gfn_range(kvm, root, range->start, range->end,
 				      range->may_block, flush, false);
 
-- 
2.35.1