CONFIG_EFI_SOFT_RESERVE: Reserve EFI Specific Purpose Memory

General informations

The Linux kernel configuration item CONFIG_EFI_SOFT_RESERVE:

• prompt: Reserve EFI Specific Purpose Memory
• type: bool
• depends on: CONFIG_EFI && CONFIG_EFI_STUB && CONFIG_ACPI_HMAT
• defined in drivers/firmware/efi/Kconfig
• found in Linux kernels: 5.5–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

On systems that have mixed performance classes of memory EFI may indicate specific purpose memory with an attribute (See EFI_MEMORY_SP in UEFI 2.8). A memory range tagged with this attribute may have unique performance characteristics compared to the system's general purpose "System RAM" pool. On the expectation that such memory has application specific usage, and its base EFI memory type is "conventional" answer Y to arrange for the kernel to reserve it as a "Soft Reserved" resource, and set aside for direct-access (device-dax) by default. The memory range can later be optionally assigned to the page allocator by system administrator policy via the device-dax kmem facility. Say N to have the kernel treat this memory as "System RAM" by default.

If unsure, say Y.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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