Messages in this thread | | | Date | Mon, 3 Aug 2015 12:26:58 +0100 | From | Will Deacon <> | Subject | Re: [PATCH V9 0/5] map GHES memory region according to EFI memory map |
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Hi Jonathan,
On Thu, Jul 30, 2015 at 10:35:04PM +0100, Jonathan (Zhixiong) Zhang wrote: > From: "Jonathan (Zhixiong) Zhang" <zjzhang@codeaurora.org> > > On a platform with APEI (ACPI Platform Error Interface) enabled, firmware > updates a memory region with hardware error record using nocache > attribute. When OS reads the region, since it maps the region with > cacahed attribute even though EFI memory map defines this region as > uncached, OS gets stale data and errorneously reports there is no new > HW error. > > When ghes driver maps the memory region, it uses the cache attribute > according to EFI memory map, if EFI memory map feature is enabled > at runtime. > > Since both arch/x86 and arch/ia64 implemented architecture agnostic EFI > memory map attribue lookup function efi_memattributes(), the code is > moved from arch/x86 into EFI subsystem and is declared as __weak; archs > other than ia64 should not override the default implementation. > > V9: > 1. Rebased to arm64-upstream-14543 of arm64/master. > 2. Match strict MM type in arch_apei_get_mem_attribute().
I guess this is all going via Matt's tree? I'm happy to take the new memory type in arch/arm64/ if there's nothing currently queued, but I suspect it makes more sense for it to stay together.
Will
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