From: Oliver Upton <oupton@kernel.org>
To: Marc Zyngier <maz@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Christoffer Dall <christoffer.dall@arm.com>,
Fuad Tabba <fuad.tabba@linux.dev>,
"Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Cc: Oliver Upton <oupton@kernel.org>,
Wei-Lin Chang <weilin.chang@arm.com>,
Yao Yuan <yaoyuan@linux.alibaba.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v3 0/2] KVM: arm64: Fix spurious warn, null ptr deref on S2 teardown race
Date: Tue, 15 Sep 2026 15:25:38 -0700 [thread overview]
Message-ID: <178951103702.10790.13969077149562964690.b4-ty@kernel.org> (raw)
In-Reply-To: <20260901-kvm-arm-nested-virt-fix-v3-0-b154676f7e4c@kernel.org>
On Tue, 01 Sep 2026 18:28:58 +0100, Lorenzo Stoakes (ARM) wrote:
> When GFNs are invalidated in L0 an MMU notifier triggers
> kvm_unmap_gfn_range() which tears down all of the stage 2 shadow page
> tables for nested guests via kvm_nested_s2_unmap().
>
> To avoid lockup, the kvm->mmu_lock is dropped while doing this and the task
> rescheduled once for each block of physical address space (32 MiB for 16
> KiB page size), with the lock being reacquired once the task is scheduled
> again.
>
> [...]
Applied to fixes, thanks!
[1/2] KVM: arm64: Fix spurious warning for benign stage 2 teardown race
https://git.kernel.org/kvmarm/kvmarm/c/38b70fc453c3
[2/2] KVM: arm64: nv: Fix null ptr deref on nested wp/unmap, teardown race
https://git.kernel.org/kvmarm/kvmarm/c/4c74e233cded
--
Best,
Oliver
prev parent reply other threads:[~2026-09-15 22:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 17:28 [PATCH v3 0/2] KVM: arm64: Fix spurious warn, null ptr deref on S2 teardown race Lorenzo Stoakes (ARM)
2026-09-01 17:28 ` [PATCH v3 1/2] KVM: arm64: Fix spurious warning for benign stage 2 " Lorenzo Stoakes (ARM)
2026-09-01 17:46 ` sashiko-bot
2026-09-01 17:29 ` [PATCH v3 2/2] KVM: arm64: nv: Fix null ptr deref on nested wp/unmap, " Lorenzo Stoakes (ARM)
2026-09-01 17:46 ` sashiko-bot
2026-09-11 8:12 ` Jonathan Davies
2026-09-11 8:44 ` Lorenzo Stoakes (ARM)
2026-09-15 22:25 ` Oliver Upton [this message]
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