From: Wupeng Ma <mawupeng1@huawei.com>
To: <akpm@linux-foundation.org>, <catalin.marinas@arm.com>,
<will@kernel.org>, <corbet@lwn.net>
Cc: <ardb@kernel.org>, <tglx@linutronix.de>, <mingo@redhat.com>,
<bp@alien8.de>, <dave.hansen@linux.intel.com>, <x86@kernel.org>,
<hpa@zyccr.com>, <dvhart@infradead.org>, <andy@infradead.org>,
<rppt@kernel.org>, <paulmck@kernel.org>, <peterz@infradead.org>,
<jroedel@suse.de>, <songmuchun@bytedance.com>,
<macro@orcam.me.uk>, <frederic@kernel.org>, <W_Armin@gmx.de>,
<john.garry@huawei.com>, <seanjc@google.com>,
<tsbogend@alpha.franken.de>, <anshuman.khandual@arm.com>,
<chenhuacai@kernel.org>, <david@redhat.com>,
<gpiccoli@igalia.com>, <mark.rutland@arm.com>,
<wangkefeng.wang@huawei.com>, <mawupeng1@huawei.com>,
<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-efi@vger.kernel.org>, <linux-ia64@vger.kernel.org>,
<platform-driver-x86@vger.kernel.org>, <linux-mm@kvack.org>
Subject: [PATCH 2/9] arm64: efi: Add fake memory support
Date: Sat, 26 Mar 2022 14:46:25 +0800 [thread overview]
Message-ID: <20220326064632.131637-3-mawupeng1@huawei.com> (raw)
In-Reply-To: <20220326064632.131637-1-mawupeng1@huawei.com>
From: Ma Wupeng <mawupeng1@huawei.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@huawei.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
next prev parent reply other threads:[~2022-03-26 6:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-26 6:46 [PATCH 0/9] introduce mirrored memory support for arm64 Wupeng Ma
2022-03-26 6:46 ` [PATCH 1/9] efi: Make efi_print_memmap() public Wupeng Ma
2022-03-26 6:46 ` Wupeng Ma [this message]
2022-03-26 6:46 ` [PATCH 3/9] efi: Make efi_find_mirror() public Wupeng Ma
2022-03-26 6:46 ` [PATCH 4/9] arm64/mirror: arm64 enabling - find mirrored memory ranges Wupeng Ma
2022-03-26 6:46 ` [PATCH 5/9] mm: Ratelimited mirrored memory related warning messages Wupeng Ma
2022-03-26 6:46 ` [PATCH 6/9] mm: Demote warning message in vmemmap_verify() to debug level Wupeng Ma
2022-03-26 6:46 ` [PATCH 7/9] mm: Calc the right pfn if page size is not 4K Wupeng Ma
2022-03-28 12:33 ` David Hildenbrand
2022-03-29 1:14 ` mawupeng
2022-03-26 6:46 ` [PATCH 8/9] efi: Disable mirror feature if kernelcore is not specified Wupeng Ma
2022-03-26 6:46 ` [PATCH 9/9] ia64/efi: Code simplification in efi_init Wupeng Ma
2022-03-29 8:26 ` [PATCH 0/9] introduce mirrored memory support for arm64 Ard Biesheuvel
2022-03-29 11:03 ` mawupeng
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