Changes since v6 [1]: - Collect Ard's ack / review on patches 5-7, but not on patch 4 since it needed a non-trivial rework for linker error reported by the 0day robot. - Fixup "efi: Common enable/disable infrastructure for EFI soft reservation" with a new dependency on CONFIG_EFI_STUB for CONFIG_EFI_SOFT_RESERVE since the efi_soft_reserve_enabled() helper is only built with EFI_STUB=y and the support depends on early reservations to keep the kernel text from landing in the reservation. This also moved the IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) check into the header so that the stub does not try to link to __efi_soft_reserve_enabled() in the EFI_STUB=n case. - Rework "x86/efi: EFI soft reservation to E820 enumeration" to always add the full EFI memory map when EFI_MEMORY_SP ranges are found. This simplifies the logic to just add the full EFI map rather than try to tease out just the EFI_MEMORY_SP ranges. (Ard) [1]: https://lore.kernel.org/lkml/157066227329.1059972.5659620631541203458.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ --- Merge notes: Hi Ingo, I'm still looking for Ard's ack on the revised patch 4, but otherwise feel like this is ready for your consideration. --- The EFI 2.8 Specification [2] introduces the EFI_MEMORY_SP ("specific purpose") memory attribute. This attribute bit replaces the deprecated ACPI HMAT "reservation hint" that was introduced in ACPI 6.2 and removed in ACPI 6.3. Given the increasing diversity of memory types that might be advertised to the operating system, there is a need for platform firmware to hint which memory ranges are free for the OS to use as general purpose memory and which ranges are intended for application specific usage. For example, an application with prior knowledge of the platform may expect to be able to exclusively allocate a precious / limited pool of high bandwidth memory. Alternatively, for the general purpose case, the operating system may want to make the memory available on a best effort basis as a unique numa-node with performance properties by the new CONFIG_HMEM_REPORTING [3] facility. In support of optionally allowing either application-exclusive and core-kernel-mm managed access to differentiated memory, claim EFI_MEMORY_SP ranges for exposure as "soft reserved" and assigned to a device-dax instance by default. Such instances can be directly owned / mapped by a platform-topology-aware application. Alternatively, with the new kmem facility [4], the administrator has the option to instead designate that those memory ranges be hot-added to the core-kernel-mm as a unique memory numa-node. In short, allow for the decision about what software agent manages soft-reserved memory to be made at runtime. The patches build on the new HMAT+HMEM_REPORTING facilities merged for v5.2-rc1. The implementation is tested with qemu emulation of HMAT [5] plus the efi_fake_mem facility for applying the EFI_MEMORY_SP attribute. Specific details on reproducing the test configuration are in patch 12. [2]: https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf [3]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e1cf33aafb84 [4]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c221c0b0308f [5]: http://patchwork.ozlabs.org/cover/1096737/ --- Dan Williams (12): acpi/numa: Establish a new drivers/acpi/numa/ directory efi: Enumerate EFI_MEMORY_SP x86/efi: Push EFI_MEMMAP check into leaf routines efi: Common enable/disable infrastructure for EFI soft reservation x86/efi: EFI soft reservation to E820 enumeration arm/efi: EFI soft reservation to memblock x86/efi: Add efi_fake_mem support for EFI_MEMORY_SP lib: Uplevel the pmem "region" ida to a global allocator dax: Fix alloc_dax_region() compile warning device-dax: Add a driver for "hmem" devices acpi/numa/hmat: Register HMAT at device_initcall level acpi/numa/hmat: Register "soft reserved" memory as an "hmem" device Documentation/admin-guide/kernel-parameters.txt | 19 +++ arch/arm64/mm/mmu.c | 2 arch/x86/boot/compressed/eboot.c | 6 + arch/x86/boot/compressed/kaslr.c | 46 +++++++- arch/x86/include/asm/e820/types.h | 8 + arch/x86/include/asm/efi.h | 17 +++ arch/x86/kernel/e820.c | 12 ++ arch/x86/kernel/setup.c | 18 +-- arch/x86/platform/efi/efi.c | 54 ++++++++- arch/x86/platform/efi/quirks.c | 3 + drivers/acpi/Kconfig | 9 -- drivers/acpi/Makefile | 3 - drivers/acpi/hmat/Makefile | 2 drivers/acpi/numa/Kconfig | 7 + drivers/acpi/numa/Makefile | 3 + drivers/acpi/numa/hmat.c | 138 +++++++++++++++++++++-- drivers/acpi/numa/srat.c | 0 drivers/dax/Kconfig | 27 ++++- drivers/dax/Makefile | 2 drivers/dax/bus.c | 2 drivers/dax/bus.h | 2 drivers/dax/dax-private.h | 2 drivers/dax/hmem.c | 56 +++++++++ drivers/firmware/efi/Kconfig | 21 ++++ drivers/firmware/efi/Makefile | 5 + drivers/firmware/efi/arm-init.c | 9 ++ drivers/firmware/efi/arm-runtime.c | 24 ++++ drivers/firmware/efi/efi.c | 13 ++ drivers/firmware/efi/esrt.c | 3 + drivers/firmware/efi/fake_mem.c | 26 ++-- drivers/firmware/efi/fake_mem.h | 10 ++ drivers/firmware/efi/libstub/arm32-stub.c | 5 + drivers/firmware/efi/libstub/efi-stub-helper.c | 19 +++ drivers/firmware/efi/libstub/random.c | 4 + drivers/firmware/efi/x86_fake_mem.c | 69 ++++++++++++ drivers/nvdimm/Kconfig | 1 drivers/nvdimm/core.c | 1 drivers/nvdimm/nd-core.h | 1 drivers/nvdimm/region_devs.c | 13 +- include/linux/efi.h | 16 +++ include/linux/ioport.h | 1 include/linux/memregion.h | 23 ++++ lib/Kconfig | 3 + lib/Makefile | 1 lib/memregion.c | 18 +++ 45 files changed, 634 insertions(+), 90 deletions(-) delete mode 100644 drivers/acpi/hmat/Makefile rename drivers/acpi/{hmat/Kconfig => numa/Kconfig} (75%) create mode 100644 drivers/acpi/numa/Makefile rename drivers/acpi/{hmat/hmat.c => numa/hmat.c} (85%) rename drivers/acpi/{numa.c => numa/srat.c} (100%) create mode 100644 drivers/dax/hmem.c create mode 100644 drivers/firmware/efi/fake_mem.h create mode 100644 drivers/firmware/efi/x86_fake_mem.c create mode 100644 include/linux/memregion.h create mode 100644 lib/memregion.c
