linux-kernel - Re: [PATCH AUTOSEL 5.0 29/98] KVM: arm/arm64: Enforce PTE mappings at stage2 when needed

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Date:   Tue, 23 Apr 2019 10:27:26 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     sashal@...nel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     yuzenghui@...wei.com, christoffer.dall@....com,
        marc.zyngier@....com, kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH AUTOSEL 5.0 29/98] KVM: arm/arm64: Enforce PTE mappings at
 stage2 when needed

Hi Sasha,

On 04/22/2019 08:40 PM, Sasha Levin wrote:
> From: Suzuki K Poulose <suzuki.poulose@....com>
> 
> [ Upstream commit a80868f398554842b14d07060012c06efb57c456 ]
> 
> commit 6794ad5443a2118 ("KVM: arm/arm64: Fix unintended stage 2 PMD mappings")
> made the checks to skip huge mappings, stricter. However it introduced
> a bug where we still use huge mappings, ignoring the flag to
> use PTE mappings, by not reseting the vma_pagesize to PAGE_SIZE.
> 
> Also, the checks do not cover the PUD huge pages, that was
> under review during the same period. This patch fixes both
> the issues.
> 
> Fixes : 6794ad5443a2118 ("KVM: arm/arm64: Fix unintended stage 2 PMD mappings")
> Reported-by: Zenghui Yu <yuzenghui@...wei.com>
> Cc: Zenghui Yu <yuzenghui@...wei.com>
> Cc: Christoffer Dall <christoffer.dall@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>

Please be aware that we need a follow up fix for this patch to fix the
problem for THP backed memory.

http://lists.infradead.org/pipermail/linux-arm-kernel/2019-April/645324.html


It should appear upstream soon.


Cheers
Suzuki