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Message-Id: <eeed890ccb951e7b0dce15bc170eb2661d5b02da.1638817640.git.maciej.szmigiero@oracle.com>
Date: Mon, 6 Dec 2021 20:54:26 +0100
From: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To: Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Igor Mammedov <imammedo@...hat.com>,
Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Julien Thierry <julien.thierry.kdev@...il.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Huacai Chen <chenhuacai@...nel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
Paul Mackerras <paulus@...abs.org>,
Christian Borntraeger <borntraeger@...ibm.com>,
Janosch Frank <frankja@...ux.ibm.com>,
David Hildenbrand <david@...hat.com>,
Cornelia Huck <cohuck@...hat.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>,
Anup Patel <anup.patel@....com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexandru Elisei <alexandru.elisei@....com>,
Ben Gardon <bgardon@...gle.com>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v7 20/29] KVM: Move WARN on invalid memslot index to update_memslots()
From: "Maciej S. Szmigiero" <maciej.szmigiero@...cle.com>
Since kvm_memslot_move_forward() can theoretically return a negative
memslot index even when kvm_memslot_move_backward() returned a positive one
(and so did not WARN) let's just move the warning to the common code.
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>
Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Reviewed-by: Sean Christopherson <seanjc@...gle.com>
---
virt/kvm/kvm_main.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index aca39b587cdb..bbc0110224f3 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1324,8 +1324,7 @@ static inline int kvm_memslot_move_backward(struct kvm_memslots *slots,
struct kvm_memory_slot *mslots = slots->memslots;
int i;
- if (WARN_ON_ONCE(slots->id_to_index[memslot->id] == -1) ||
- WARN_ON_ONCE(!slots->used_slots))
+ if (slots->id_to_index[memslot->id] == -1 || !slots->used_slots)
return -1;
/*
@@ -1429,6 +1428,9 @@ static void update_memslots(struct kvm_memslots *slots,
i = kvm_memslot_move_backward(slots, memslot);
i = kvm_memslot_move_forward(slots, memslot, i);
+ if (WARN_ON_ONCE(i < 0))
+ return;
+
/*
* Copy the memslot to its new position in memslots and update
* its index accordingly.
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