linux-kernel - Re: [PATCH] KVM: arm64: Release mmap_lock when using VM

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Message-Id: <163343660135.3849383.15321540060917928025.b4-ty@kernel.org>
Date:   Tue,  5 Oct 2021 13:23:28 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Alexandru Elisei <alexandru.elisei@....com>,
        Quentin Perret <qperret@...gle.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        Steven Price <steven.price@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     kernel-team@...roid.com
Subject: Re: [PATCH] KVM: arm64: Release mmap_lock when using VM_SHARED with MTE

On Tue, 5 Oct 2021 13:20:31 +0100, Quentin Perret wrote:
> VM_SHARED mappings are currently forbidden in a memslot with MTE to
> prevent two VMs racing to sanitise the same page. However, this check
> is performed while holding current->mm's mmap_lock, but fails to release
> it. Fix this by releasing the lock when needed.

Applied to fixes, thanks!

[1/1] KVM: arm64: Release mmap_lock when using VM_SHARED with MTE
      commit: 6e6a8ef088e1222cb1250942f51ad9c1ab219ab2

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.