From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: "Julien Grall" <julien@xen.org>,
"Suzuki K Poulose" <suzuki.poulose@arm.com>,
"André Przywara" <andre.przywara@arm.com>,
stable@vger.kernel.org, "Eric Auger" <eric.auger@redhat.com>,
"James Morse" <james.morse@arm.com>,
"Zenghui Yu" <yuzenghui@huawei.com>,
"Julien Thierry" <julien.thierry.kdev@gmail.com>
Subject: [PATCH v3 1/6] KVM: arm: vgic: Fix limit condition when writing to GICD_I[CS]ACTIVER
Date: Wed, 22 Apr 2020 17:18:39 +0100 [thread overview]
Message-ID: <20200422161844.3848063-2-maz@kernel.org> (raw)
In-Reply-To: <20200422161844.3848063-1-maz@kernel.org>
When deciding whether a guest has to be stopped we check whether this
is a private interrupt or not. Unfortunately, there's an off-by-one bug
here, and we fail to recognize a whole range of interrupts as being
global (GICv2 SPIs 32-63).
Fix the condition from > to be >=.
Cc: stable@vger.kernel.org
Fixes: abd7229626b93 ("KVM: arm/arm64: Simplify active_change_prepare and plug race")
Reported-by: André Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
virt/kvm/arm/vgic/vgic-mmio.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
index 2199302597faf..d085e047953fa 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.c
+++ b/virt/kvm/arm/vgic/vgic-mmio.c
@@ -444,7 +444,7 @@ static void vgic_mmio_change_active(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
static void vgic_change_active_prepare(struct kvm_vcpu *vcpu, u32 intid)
{
if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3 ||
- intid > VGIC_NR_PRIVATE_IRQS)
+ intid >= VGIC_NR_PRIVATE_IRQS)
kvm_arm_halt_guest(vcpu->kvm);
}
@@ -452,7 +452,7 @@ static void vgic_change_active_prepare(struct kvm_vcpu *vcpu, u32 intid)
static void vgic_change_active_finish(struct kvm_vcpu *vcpu, u32 intid)
{
if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3 ||
- intid > VGIC_NR_PRIVATE_IRQS)
+ intid >= VGIC_NR_PRIVATE_IRQS)
kvm_arm_resume_guest(vcpu->kvm);
}
--
2.26.1
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next prev parent reply other threads:[~2020-04-22 16:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-22 16:18 [PATCH v3 0/6] KVM: arm: vgic fixes for 5.7 Marc Zyngier
2020-04-22 16:18 ` Marc Zyngier [this message]
2020-04-22 16:18 ` [PATCH v3 2/6] KVM: arm: vgic: Synchronize the whole guest on GIC{D, R}_I{S, C}ACTIVER read Marc Zyngier
2020-04-22 16:18 ` [PATCH v3 3/6] KVM: arm: vgic: Only use the virtual state when userspace accesses enable bits Marc Zyngier
2020-04-22 16:18 ` [PATCH v3 4/6] KVM: arm: vgic-v2: Only use the virtual state when userspace accesses pending bits Marc Zyngier
2020-04-23 11:05 ` James Morse
2020-04-22 16:18 ` [PATCH v3 5/6] KVM: arm64: vgic-v3: Retire all pending LPIs on vcpu destroy Marc Zyngier
2020-04-23 11:35 ` James Morse
2020-04-23 11:57 ` Zenghui Yu
2020-04-23 14:34 ` James Morse
2020-04-23 12:03 ` Marc Zyngier
2020-04-23 12:18 ` Zenghui Yu
2020-04-23 14:34 ` James Morse
2020-04-23 15:13 ` Marc Zyngier
2020-04-22 16:18 ` [PATCH v3 6/6] KVM: arm64: vgic-its: Fix memory leak on the error path of vgic_add_lpi() Marc Zyngier
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