linux-kernel - Re: [PATCH 3.16 121/178] kvm: arm/arm64: Fix locking for kvm_free_stage2

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Message-ID: <1500394761.4585.11.camel@decadent.org.uk>
Date:   Tue, 18 Jul 2017 17:19:21 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     Suzuki K Poulose <Suzuki.Poulose@....com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     akpm@...ux-foundation.org, Mark Rutland <mark.rutland@....com>,
        Paolo Bonzini <pbonzin@...hat.com>,
        Christoffer Dall <cdall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH 3.16 121/178] kvm: arm/arm64: Fix locking for
 kvm_free_stage2_pgd

On Mon, 2017-07-17 at 16:12 +0100, Suzuki K Poulose wrote:
> On 16/07/17 14:56, Ben Hutchings wrote:
> > 3.16.46-rc1 review patch.  If anyone has any objections, please let me know.
> >
> > ------------------
> >
> > From: Suzuki K Poulose <suzuki.poulose@....com>
> >
[...]
> There is a follow up patch for this one to make sure we check/free the PGD under the
> mmu_lock.
> 
> commit 6c0d706b563af73 ("kvm: arm/arm64: Fix race in resetting stage2 PGD")
> 
> So unless you want to fold that in, this looks alright. Looks like we missed a Cc:
> stable for that. I will send it to stable soon.

That does look like a fix suitable for stable.  So far as I can see,
though, "kvm: arm/arm64: Fix locking for kvm_free_stage2_pgd" does not
introduce a regression - right?  So I don't have to apply the two at
the same time.

Ben.

-- 
Ben Hutchings
Quantity is no substitute for quality, but it's the only one we've got.


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