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Date:   Thu, 9 Nov 2017 20:22:53 +0800
From:   Zhengqiang <>
To:     James Morse <>, <>
CC:     "Rafael J . Wysocki" <>,
        Tony Luck <>,
        Xie XiuQi <>,
        Tyler Baicar <>,
        Catalin Marinas <>, <>,
        Will Deacon <>,
        Dongjiu Geng <>,
        Ingo Molnar <>,
        "H . Peter Anvin" <>,
        Thomas Gleixner <>,
        Borislav Petkov <>, <>,
        <>, Len Brown <>
Subject: Re: [RFC/RFT PATCH 0/6] Switch GHES ioremap_page_range() to use

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 <>

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


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