From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oliver.upton@linux.dev>,
Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>,
vdonnefort@google.com
Subject: [PATCH 0/5] KVM: arm64: vgic fixes for 6.7
Date: Thu, 7 Dec 2023 15:11:56 +0000 [thread overview]
Message-ID: <20231207151201.3028710-1-maz@kernel.org> (raw)
It appears that under some cirumstances, the lifetime of a vcpu
doesn't correctly align with that of the structure describing the
redistributor associated with that vcpu. That's not great.
Fixing it is, unfortunately, not as trivial as it appears as the
required locking gets in the way.
The first two patches in this series amend that locking so that the
third patch, which is the actual fix, becomes almost trivial. The last
two patches are more cosmetic and only add assertions that helped me
debugging the whole thing.
I've earmarked the first 3 patches as stable candidates, and would
love to see them in 6.7. Patches on top of -rc4.
Marc Zyngier (5):
KVM: arm64: vgic: Simplify kvm_vgic_destroy()
KVM: arm64: vgic: Add a non-locking primitive for
kvm_vgic_vcpu_destroy()
KVM: arm64: vgic: Force vcpu vgic teardown on vcpu destroy
KVM: arm64: vgic: Ensure that slots_lock is held in
vgic_register_all_redist_iodevs()
KVM: Convert comment into an assertion in kvm_io_bus_register_dev()
arch/arm64/kvm/arm.c | 2 +-
arch/arm64/kvm/vgic/vgic-init.c | 47 ++++++++++++++++++------------
arch/arm64/kvm/vgic/vgic-mmio-v3.c | 4 ++-
arch/arm64/kvm/vgic/vgic.h | 1 +
virt/kvm/kvm_main.c | 3 +-
5 files changed, 36 insertions(+), 21 deletions(-)
--
2.39.2
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next reply other threads:[~2023-12-07 15:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-07 15:11 Marc Zyngier [this message]
2023-12-07 15:11 ` [PATCH 1/5] KVM: arm64: vgic: Simplify kvm_vgic_destroy() Marc Zyngier
2023-12-07 15:11 ` [PATCH 2/5] KVM: arm64: vgic: Add a non-locking primitive for kvm_vgic_vcpu_destroy() Marc Zyngier
2023-12-07 15:11 ` [PATCH 3/5] KVM: arm64: vgic: Force vcpu vgic teardown on vcpu destroy Marc Zyngier
2023-12-07 15:12 ` [PATCH 4/5] KVM: arm64: vgic: Ensure that slots_lock is held in vgic_register_all_redist_iodevs() Marc Zyngier
2023-12-07 15:12 ` [PATCH 5/5] KVM: Convert comment into an assertion in kvm_io_bus_register_dev() Marc Zyngier
2023-12-12 7:45 ` [PATCH 0/5] KVM: arm64: vgic fixes for 6.7 Oliver Upton
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