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Date: Sat, 26 Mar 2022 14:46:25 +0800 From: Wupeng Ma <mawupeng1@...wei.com> To: <akpm@...ux-foundation.org>, <catalin.marinas@....com>, <will@...nel.org>, <corbet@....net> CC: <ardb@...nel.org>, <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...cr.com>, <dvhart@...radead.org>, <andy@...radead.org>, <rppt@...nel.org>, <paulmck@...nel.org>, <peterz@...radead.org>, <jroedel@...e.de>, <songmuchun@...edance.com>, <macro@...am.me.uk>, <frederic@...nel.org>, <W_Armin@....de>, <john.garry@...wei.com>, <seanjc@...gle.com>, <tsbogend@...ha.franken.de>, <anshuman.khandual@....com>, <chenhuacai@...nel.org>, <david@...hat.com>, <gpiccoli@...lia.com>, <mark.rutland@....com>, <wangkefeng.wang@...wei.com>, <mawupeng1@...wei.com>, <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-efi@...r.kernel.org>, <linux-ia64@...r.kernel.org>, <platform-driver-x86@...r.kernel.org>, <linux-mm@...ck.org> Subject: [PATCH 2/9] arm64: efi: Add fake memory support From: Ma Wupeng <mawupeng1@...wei.com> Fake memory map is used for faking memory's attribute values. Commit 0f96a99dab36 ("efi: Add "efi_fake_mem" boot option") introduce the efi_fake_mem function. Now it can support arm64 with this patch. For example you can mark 0-6G memory as EFI_MEMORY_MORE_RELIABLE by adding efi_fake_mem=6G@0:0x10000 in the bootarg. You find more info about fake memmap in kernel-parameters.txt. Variable memstart_addr is only confirmed after arm64_memblock_init(). So efi_fake_memmap() is needed to add after arm64_memblock_init(). Otherwise: efi_memmap_alloc memblock_phys_alloc kmemleak_alloc_phys kmemleak_alloc(__va(phys), size, min_count, gfp); this __va() will convert phys to a fault va and lead to a kmemleak error. Signed-off-by: Ma Wupeng <mawupeng1@...wei.com> --- Documentation/admin-guide/kernel-parameters.txt | 2 +- arch/arm64/kernel/setup.c | 2 ++ drivers/firmware/efi/Kconfig | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index b7ccaa2ea867..e064839895ee 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1357,7 +1357,7 @@ you are really sure that your UEFI does sane gc and fulfills the spec otherwise your board may brick. - efi_fake_mem= nn[KMG]@ss[KMG]:aa[,nn[KMG]@ss[KMG]:aa,..] [EFI; X86] + efi_fake_mem= nn[KMG]@ss[KMG]:aa[,nn[KMG]@ss[KMG]:aa,..] [EFI; X86; ARM64] Add arbitrary attribute to specific memory range by updating original EFI memory map. Region of memory which aa attribute is added to is diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 3505789cf4bd..daade64889ff 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -344,6 +344,8 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p) arm64_memblock_init(); + efi_fake_memmap(); + paging_init(); acpi_table_upgrade(); diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index 2c3dac5ecb36..3c91bbd4097a 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -50,7 +50,7 @@ config EFI_RUNTIME_MAP config EFI_FAKE_MEMMAP bool "Enable EFI fake memory map" - depends on EFI && X86 + depends on EFI && (X86 || ARM64) default n help Saying Y here will enable "efi_fake_mem" boot option. -- 2.18.0.huawei.25
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