linux-kernel - Re: [PATCH v8 1/9] KVM: arm/arm64: Ensure only THP is candidate for adjustment

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Message-ID: <87tvm3i9dt.fsf@e105922-lin.cambridge.arm.com>
Date:   Wed, 03 Oct 2018 11:59:10 +0100
From:   Punit Agrawal <punit.agrawal@....com>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     kvmarm@...ts.cs.columbia.edu, will.deacon@....com,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 1/9] KVM: arm/arm64: Ensure only THP is candidate for adjustment

Marc Zyngier <marc.zyngier@....com> writes:

> On 01/10/18 16:54, Punit Agrawal wrote:
>> PageTransCompoundMap() returns true for hugetlbfs and THP
>> hugepages. This behaviour incorrectly leads to stage 2 faults for
>> unsupported hugepage sizes (e.g., 64K hugepage with 4K pages) to be
>> treated as THP faults.
>>
>> Tighten the check to filter out hugetlbfs pages. This also leads to
>> consistently mapping all unsupported hugepage sizes as PTE level
>> entries at stage 2.
>>
>> Signed-off-by: Punit Agrawal <punit.agrawal@....com>
>> Reviewed-by: Suzuki Poulose <suzuki.poulose@....com>
>> Cc: Christoffer Dall <christoffer.dall@....com>
>> Cc: Marc Zyngier <marc.zyngier@....com>
>> Cc: stable@...r.kernel.org # v4.13+
>
> FWIW, I've cherry-picked that single patch from the series and queued
> it for 4.20.

Thanks for picking up the fix.