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efi: Don't add memblocks for soft-reserved memory

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[ Upstream commit 0bcff59ef7a652fcdc6d535554b63278c2406c8f ]

Adding memblocks for soft-reserved regions prevents them from later being
hotplugged in by dax_kmem.

Signed-off-by: Andrew Bresticker <abrestic@rivosinc.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrew Bresticker 2024-02-02 10:07:04 -08:00 committed by Greg Kroah-Hartman
parent 4fff3d735b
commit 988ae00e69
1 changed files with 10 additions and 9 deletions
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19
drivers/firmware/efi/efi-init.c
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@ -141,15 +141,6 @@ static __init int is_usable_memory(efi_memory_desc_t *md)
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
case EFI_PERSISTENT_MEMORY:
/*
* Special purpose memory is 'soft reserved', which means it
* is set aside initially, but can be hotplugged back in or
* be assigned to the dax driver after boot.
*/
if (efi_soft_reserve_enabled() &&
(md->attribute & EFI_MEMORY_SP))
return false;
/*
* According to the spec, these regions are no longer reserved
* after calling ExitBootServices(). However, we can only use
@ -194,6 +185,16 @@ static __init void reserve_regions(void)
size = npages << PAGE_SHIFT;
if (is_memory(md)) {
/*
* Special purpose memory is 'soft reserved', which
* means it is set aside initially. Don't add a memblock
* for it now so that it can be hotplugged back in or
* be assigned to the dax driver after boot.
*/
if (efi_soft_reserve_enabled() &&
(md->attribute & EFI_MEMORY_SP))
continue;
early_init_dt_add_memory_arch(paddr, size);
if (!is_usable_memory(md))