linux-kernel - Re: [RFC/RFT PATCH 0/6] Switch GHES ioremap_page

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Date:   Thu, 9 Nov 2017 20:22:53 +0800
From:   Zhengqiang <zhengqiang10@...wei.com>
To:     James Morse <james.morse@....com>, <linux-acpi@...r.kernel.org>
CC:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Tony Luck <tony.luck@...el.com>,
        Xie XiuQi <xiexiuqi@...wei.com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Catalin Marinas <catalin.marinas@....com>, <x86@...nel.org>,
        Will Deacon <will.deacon@....com>,
        <linux-kernel@...r.kernel.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>, <torvalds@...ux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>, Len Brown <lenb@...nel.org>
Subject: Re: [RFC/RFT PATCH 0/6] Switch GHES ioremap_page_range() to use
 fixmap



On 2017/10/31 23:38, James Morse wrote:
> GHES is doing ioremap_page_range() in both NMI and irq context, neither
> are safe as it may sleep to allocate intermediate levels of page table.
> 
> Replace the NMI/irq GHES_IOREMAP_PAGES to use a fixmap entry each.
> 
> After this nothing uses ghes_ioremap_area or arch_apei_flush_tlb_one(),
> rip them out.
> 
> RFC as I've only build-tested this on x86. For arm64 I've tested it on a
> software model. Any more testing would be welcome. These patches are based
> on rc7.
> 


Tested-by:  Qiang Zheng <zhengqiang10@...wei.com>

Verified on our arm64, it work for me. Thanks.

Qiang