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SubjectRe: [PATCH v5 05/10] x86, efi: Add efi_fake_mem support for EFI_MEMORY_SP

* Dan Williams <> wrote:

> Given that EFI_MEMORY_SP is platform BIOS policy descision for marking
> memory ranges as "reserved for a specific purpose" there will inevitably
> be scenarios where the BIOS omits the attribute in situations where it
> is desired. Unlike other attributes if the OS wants to reserve this
> memory from the kernel the reservation needs to happen early in init. So
> early, in fact, that it needs to happen before e820__memblock_setup()
> which is a pre-requisite for efi_fake_memmap() that wants to allocate
> memory for the updated table.
> Introduce an x86 specific efi_fake_memmap_early() that can search for
> attempts to set EFI_MEMORY_SP via efi_fake_mem and update the e820 table
> accordingly.
> The KASLR code that scans the command line looking for user-directed
> memory reservations also needs to be updated to consider
> "efi_fake_mem=nn@ss:0x40000" requests.
> Cc: <>
> Cc: Borislav Petkov <>
> Cc: Ingo Molnar <>
> Cc: "H. Peter Anvin" <>
> Cc: Thomas Gleixner <>
> Cc: Ard Biesheuvel <>
> Reviewed-by: Dave Hansen <>
> Signed-off-by: Dan Williams <>

A couple of these patches are touching EFI code, but only the first one
carries a Reviewed-by from Ard.

Ard, are these patches and the whole series fine with you?



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