From: Mike Rapoport rppt@kernel.org
commit 2f5b3514c33fecad4003ce0f22ca9691492d310b upstream.
The memory reservation in arch/x86/platform/efi/efi.c depends on at least two command line parameters. Put it back later in the boot process and move efi_memblock_x86_reserve_range() out of early_memory_reserve().
An attempt to fix this was done in
8d48bf8206f7 ("x86/boot: Pull up cmdline preparation and early param parsing")
but that caused other troubles so it got reverted.
The bug this is addressing is:
Dan reports that Anjaneya Chagam can no longer use the efi=nosoftreserve kernel command line parameter to suppress "soft reservation" behavior.
This is due to the fact that the following call-chain happens at boot:
early_reserve_memory |-> efi_memblock_x86_reserve_range |-> efi_fake_memmap_early
which does
if (!efi_soft_reserve_enabled()) return;
and that would have set EFI_MEM_NO_SOFT_RESERVE after having parsed "nosoftreserve".
However, parse_early_param() gets called *after* it, leading to the boot cmdline not being taken into account.
See also https://lore.kernel.org/r/e8dd8993c38702ee6dd73b3c11f158617e665607.camel@int...
[ bp: Turn into a proper patch. ]
Signed-off-by: Mike Rapoport rppt@kernel.org Signed-off-by: Borislav Petkov bp@suse.de Link: https://lore.kernel.org/r/20211213112757.2612-4-bp@alien8.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/setup.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -713,9 +713,6 @@ static void __init early_reserve_memory(
early_reserve_initrd();
- if (efi_enabled(EFI_BOOT)) - efi_memblock_x86_reserve_range(); - memblock_x86_reserve_range_setup_data();
reserve_ibft_region(); @@ -890,6 +887,9 @@ void __init setup_arch(char **cmdline_p)
parse_early_param();
+ if (efi_enabled(EFI_BOOT)) + efi_memblock_x86_reserve_range(); + #ifdef CONFIG_MEMORY_HOTPLUG /* * Memory used by the kernel cannot be hot-removed because Linux