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Subject[RFC/RFT PATCH 0/6] Switch GHES ioremap_page_range() to use fixmap
Date
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

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