linux-kernel - Re: [PATCH] KVM: arm64: Fix unaligned addr case in mmu walking

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Date:   Thu,  4 Mar 2021 09:55:30 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Jia He <justin.he@....com>, kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH] KVM: arm64: Fix unaligned addr case in mmu walking

On Wed, 3 Mar 2021 10:42:25 +0800, Jia He wrote:
> If the start addr is not aligned with the granule size of that level.
> loop step size should be adjusted to boundary instead of simple
> kvm_granual_size(level) increment. Otherwise, some mmu entries might miss
> the chance to be walked through.
> E.g. Assume the unmap range [data->addr, data->end] is
> [0xff00ab2000,0xff00cb2000] in level 2 walking and NOT block mapping.
> And the 1st part of that pmd entry is [0xff00ab2000,0xff00c00000]. The
> pmd value is 0x83fbd2c1002 (not valid entry). In this case, data->addr
> should be adjusted to 0xff00c00000 instead of 0xff00cb2000.
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: Fix unaligned addr case in mmu walking
      commit: e85583b3f1fe62c9b371a3100c1c91af94005ca9

Cheers,

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