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Date: Thu, 27 May 2021 18:39:15 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH 0/4] arm64: Make kexec_file_load honor iomem reservations
Message-ID: <20210527173915.GH8661@arm.com>
References: <20210526190531.62751-1-maz@kernel.org>
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To: Marc Zyngier <maz@kernel.org>
Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>, Mark Rutland <mark.rutland@arm.com>, James Morse <james.morse@arm.com>, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, Hanjun Guo <guohanjun@huawei.com>, Sudeep Holla <sudeep.holla@arm.com>, Eric Biederman <ebiederm@xmission.com>, Bhupesh SHARMA <bhupesh.sharma@linaro.org>, AKASHI Takahiro <takahiro.akashi@linaro.org>, Dave Young <dyoung@redhat.com>, Moritz Fischer <mdf@kernel.org>, kernel-team@android.com

On Wed, May 26, 2021 at 08:05:27PM +0100, Marc Zyngier wrote:
> This series is a complete departure from the approach I initially sent
> almost a month ago[1]. Instead of trying to teach EFI, ACPI and other
> subsystem to use memblock, I've decided to stick with the iomem
> resource tree and use that exclusively for arm64.
> 
> This means that my current approach is (despite what I initially
> replied to both Dave and Catalin) to provide an arm64-specific
> implementation of arch_kexec_locate_mem_hole() which walks the
> resource tree and excludes ranges of RAM that have been registered for
> any odd purpose. This is exactly what the userspace implementation
> does, and I don't really see a good reason to diverge from it.
> 
> Again, this allows my Synquacer board to reliably use kexec_file_load
> with as little as 256M, something that would always fail before as it
> would overwrite most of the reserved tables.
> 
> Obviously, this is now at least 5.14 material. Given how broken
> kexec_file_load is for non-crash kernels on arm64 at the moment,
> should we at least disable it in 5.13 and all previous stable kernels?

I think it makes sense to disable it in the current and earlier kernels.

For this series:

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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