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

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Message-Id: <20171031153832.17746-1-james.morse@arm.com>
Date:   Tue, 31 Oct 2017 15:38:26 +0000
From:   James Morse <james.morse@....com>
To:     linux-acpi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>, torvalds@...ux-foundation.org,
        James Morse <james.morse@....com>
Subject: [RFC/RFT PATCH 0/6] Switch GHES ioremap_page_range() to use fixmap

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.

Thanks,

James Morse (6):
  arm64: fixmap: Add GHES fixmap entries
  x86/mm/fixmap: Add GHES fixmap entries
  ACPI / APEI:  Replace ioremap_page_range() with fixmap
  ACPI / APEI: Remove ghes_ioremap_area
  arm64: mm: Remove arch_apei_flush_tlb_one()
  ACPI / APEI: Remove arch_apei_flush_tlb_one()

 arch/arm64/include/asm/acpi.h   | 12 ------
 arch/arm64/include/asm/fixmap.h |  5 +++
 arch/arm64/mm/mmu.c             |  4 ++
 arch/x86/include/asm/fixmap.h   |  4 ++
 arch/x86/kernel/acpi/apei.c     |  5 ---
 drivers/acpi/apei/ghes.c        | 84 +++++++++--------------------------------
 include/acpi/apei.h             |  1 -
 7 files changed, 30 insertions(+), 85 deletions(-)

-- 
2.15.0.rc2