On Wed, 30 Sep, at 11:01:56PM, Taku Izumi wrote: > This patch introduces new boot option named "efi_fake_mem". > By specifying this parameter, you can add arbitrary attribute > to specific memory range. > This is useful for debugging of Address Range Mirroring feature. > > For example, if "efi_fake_mem=2G@4G:0x10000,2G@0x10a0000000:0x10000" > is specified, the original (firmware provided) EFI memmap will be > updated so that the specified memory regions have > EFI_MEMORY_MORE_RELIABLE attribute (0x10000): > > <original> > efi: mem36: [Conventional Memory| | | | | | |WB|WT|WC|UC] range=[0x0000000100000000-0x00000020a0000000) (129536MB) > > <updated> > efi: mem36: [Conventional Memory| |MR| | | | |WB|WT|WC|UC] range=[0x0000000100000000-0x0000000180000000) (2048MB) > efi: mem37: [Conventional Memory| | | | | | |WB|WT|WC|UC] range=[0x0000000180000000-0x00000010a0000000) (61952MB) > efi: mem38: [Conventional Memory| |MR| | | | |WB|WT|WC|UC] range=[0x00000010a0000000-0x0000001120000000) (2048MB) > efi: mem39: [Conventional Memory| | | | | | |WB|WT|WC|UC] range=[0x0000001120000000-0x00000020a0000000) (63488MB) > > And you will find that the following message is output: > > efi: Memory: 4096M/131455M mirrored memory > > Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx> > --- > Documentation/kernel-parameters.txt | 15 +++ > arch/x86/kernel/setup.c | 4 +- > drivers/firmware/efi/Kconfig | 22 ++++ > drivers/firmware/efi/Makefile | 1 + > drivers/firmware/efi/fake_mem.c | 238 ++++++++++++++++++++++++++++++++++++ > include/linux/efi.h | 6 + > 6 files changed, 285 insertions(+), 1 deletion(-) > create mode 100644 drivers/firmware/efi/fake_mem.c Looks good to me! I've queued this up with one minor change... > +config EFI_MAX_FAKE_MEM > + int "maximum allowable number of ranges in efi_fake_mem boot option" > + depends on EFI && X86 && EFI_FAKE_MEMMAP We can simplify this depends line since EFI_FAKE_MEMMAP itself is dependent on EFI and X86, and we should use that level of indirection to our advantage to save updating this line if/when arm64 support is added. -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
