Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: 4e90b65e7b7bf0c090d3bc5142a684acac56345f
https://github.com/tianocore/edk2/commit/4e90b65e7b7bf0c090d3bc5142a684acac56345f
Author: fanhuang <[email protected]>
Date: 2026-03-11 (Wed, 11 Mar 2026)
Changed paths:
M OvmfPkg/Include/IndustryStandard/E820.h
M OvmfPkg/Library/PlatformInitLib/MemDetect.c
Log Message:
-----------
OvmfPkg/PlatformInitLib: Add SoftReserved memory type support
Add support for E820 Soft Reserved Memory regions in OVMF firmware.
This memory type is used by QEMU to expose Specific Purpose Memory (SPM).
Changes:
- Add EfiAcpiAddressRangeSoftReserved to EFI_ACPI_MEMORY_TYPE enum
- Handle SoftReserved in PlatformAddHobCB() by creating Resource HOBs
with standard memory attributes plus EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE
Background:
- E820_TYPE_SOFT_RESERVED (0xEFFFFFFF) is defined in Linux kernel:
include/uapi/linux/e820.h
- SPM (Specific Purpose Memory) is defined in ACPI 6.4+ specification
- Use cases include High Bandwidth Memory (HBM) attached to accelerators/GPUs
The 0xEFFFFFFF value follows the E820 extension convention where values
above 0x7FFFFFFF are reserved for OEM/firmware-specific use. Linux kernel
adopted this value for "soft reserved" memory that should not be used by
the OS for general allocation but can be managed by device drivers.
Signed-off-by: FangSheng Huang <[email protected]>
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