linux-kernel - [PATCH] KVM: x86/mmu: kvm_faultin_pfn has to return false if pfh is returned

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Message-Id: <20211015163221.472508-1-avagin@gmail.com>
Date:   Fri, 15 Oct 2021 09:32:21 -0700
From:   Andrei Vagin <avagin@...il.com>
To:     linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org
Cc:     Andrei Vagin <avagin@...il.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH] KVM: x86/mmu: kvm_faultin_pfn has to return false if pfh is returned

This looks like a typo in 8f32d5e563cb. This change didn't intend to do
any functional changes.

The problem was caught by gVisor tests.

Fixes: 8f32d5e563cb ("KVM: x86/mmu: allow kvm_faultin_pfn to return page fault handling code")
Cc: Maxim Levitsky <mlevitsk@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Andrei Vagin <avagin@...il.com>
---
 arch/x86/kvm/mmu/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 1a64ba5b9437..5dce77b45476 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3956,7 +3956,7 @@ static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
 
 	*pfn = __gfn_to_pfn_memslot(slot, gfn, false, NULL,
 				    write, writable, hva);
-
+	return false;
 out_retry:
 	*r = RET_PF_RETRY;
 	return true;
-- 
2.31.1