linux-kernel - Re: [PATCH V2] arm64/mm: Fix __enable

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Message-ID: <20220826120020.GB520@mutt>
Date:   Fri, 26 Aug 2022 14:00:20 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        James Morse <james.morse@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, alex.bennee@...aro.org, arnd@...db.de
Subject: Re: [PATCH V2] arm64/mm: Fix __enable_mmu() for new TGRAN range
 values

On 2021-03-10 11:23, Anshuman Khandual wrote:
> From: James Morse <james.morse@....com>
> 
> As per ARM ARM DDI 0487G.a, when FEAT_LPA2 is implemented, ID_AA64MMFR0_EL1
> might contain a range of values to describe supported translation granules
> (4K and 16K pages sizes in particular) instead of just enabled or disabled
> values. This changes __enable_mmu() function to handle complete acceptable
> range of values (depending on whether the field is signed or unsigned) now
> represented with ID_AA64MMFR0_TGRAN_SUPPORTED_[MIN..MAX] pair. While here,
> also fix similar situations in EFI stub and KVM as well.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: James Morse <james.morse@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: kvmarm@...ts.cs.columbia.edu
> Cc: linux-efi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Acked-by: Marc Zyngier <maz@...nel.org>
> Signed-off-by: James Morse <james.morse@....com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Hi,

When building an arm64 defconfig kernel from stable/linux-5.10.y and
booting that in QEMU (version: 1:7.0+dfsg-2~bpo11+2) with '-cpu max' the
kernel doesn't boot. I don't get any output.  The kernel boots fine if I
change to '-cpu cortex-a72'.

If I cherry-pick this patch to stable/linux-5.10.y I'm able too boot the
kernel with '-cpu max'.

However, I'm not comfortable to backport this patch to older kernels
since there are a lot of conflicts.
Can someone help out to do the packport?

Cheers,
Anders