linux-kernel - Re: [PATCH v2 0/3] arm64: kdump : take off the protection on crashkernel memory region

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Date:   Tue, 11 Apr 2023 19:37:24 +0100
From:   Will Deacon <will@...nel.org>
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, thunder.leizhen@...wei.com,
        horms@...nel.org, John.p.donnelly@...cle.com,
        linux-arm-kernel@...ts.infradead.org, ardb@...nel.org,
        rppt@...nel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH v2 0/3] arm64: kdump : take off the protection on crashkernel memory region

On Fri, 7 Apr 2023 09:15:04 +0800, Baoquan He wrote:
> Problem:
> =======
> On arm64, block and section mapping is supported to build page tables.
> However, currently it enforces to take base page mapping for the whole
> linear mapping if CONFIG_ZONE_DMA or CONFIG_ZONE_DMA32 is enabled and
> crashkernel kernel parameter is set. This will cause longer time of the
> linear mapping process during bootup and severe performance degradation
> during running time.
> 
> [...]

Applied to arm64 (for-next/kdump), thanks!

[1/3] arm64: kdump : take off the protection on crashkernel memory region
      https://git.kernel.org/arm64/c/0d124e96051b
[2/3] arm64: kdump: do not map crashkernel region specifically
      https://git.kernel.org/arm64/c/04a2a7af3d97
[3/3] arm64: kdump: defer the crashkernel reservation for platforms with no DMA memory zones
      https://git.kernel.org/arm64/c/504cae453f82

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev