* Re: [PATCH 0/2] arm64: Support to find mirrored memory ranges
2020-02-21 12:52 [PATCH 0/2] arm64: Support to find mirrored memory ranges Jing Xiangfeng
@ 2020-02-20 9:21 ` Ard Biesheuvel
2020-02-21 12:52 ` [PATCH 1/2] efi: allow EFI_FAKE_MEMMAP on arm64 platform Jing Xiangfeng
2020-02-21 12:53 ` [PATCH 2/2] arm64/efi: support to find mirrored memory ranges Jing Xiangfeng
2 siblings, 0 replies; 4+ messages in thread
From: Ard Biesheuvel @ 2020-02-20 9:21 UTC (permalink / raw)
To: Jing Xiangfeng
Cc: Thomas Gleixner, Ingo Molnar, Borislav Petkov, H. Peter Anvin,
the arch/x86 maintainers, Darren Hart, Andy Shevchenko,
linux-efi, Linux Kernel Mailing List, platform-driver-x86,
Linux-MM, Kefeng Wang
On Thu, 20 Feb 2020 at 04:43, Jing Xiangfeng <jingxiangfeng@huawei.com> wrote:
>
> This series enable finding mirrored memory ranges
> functionality on arm64 platform. This feature has been
> implemented on the x86 platform, so we move some
> functions from x86.
>
Hello Jing Xiangfeng,
Could you explain your use case a bit better? Usually, the firmware is
a better place to make modifications to the EFI memory map.
The reason I am asking is that currently, on ARM and arm64, we never
make *any* changes to the firmware provided tables (EFI system table,
EFI memory map, DT/ACPI/SMBIOS tables etc), in order to ensure that
kexec is idempotent, i.e., it will always see the exact same state as
far as the firmware is concerned. This is a bit different from x86,
where the memory map is already modified for various other reasons, so
using it for fake memory regions is not such a big deal.
Do you see a use case for this in production?
> Jing Xiangfeng (2):
> efi: allow EFI_FAKE_MEMMAP on arm64 platform
> arm64/efi: support to find mirrored memory ranges
>
> arch/x86/include/asm/efi.h | 5 -----
> arch/x86/platform/efi/efi.c | 39 ---------------------------------------
> drivers/firmware/efi/Kconfig | 2 +-
> drivers/firmware/efi/arm-init.c | 2 ++
> drivers/firmware/efi/efi.c | 23 +++++++++++++++++++++++
> drivers/firmware/efi/memmap.c | 16 ++++++++++++++++
> include/linux/efi.h | 5 +++++
> 7 files changed, 47 insertions(+), 45 deletions(-)
>
> --
> 1.8.3.1
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 1/2] efi: allow EFI_FAKE_MEMMAP on arm64 platform
2020-02-21 12:52 [PATCH 0/2] arm64: Support to find mirrored memory ranges Jing Xiangfeng
2020-02-20 9:21 ` Ard Biesheuvel
@ 2020-02-21 12:52 ` Jing Xiangfeng
2020-02-21 12:53 ` [PATCH 2/2] arm64/efi: support to find mirrored memory ranges Jing Xiangfeng
2 siblings, 0 replies; 4+ messages in thread
From: Jing Xiangfeng @ 2020-02-21 12:52 UTC (permalink / raw)
To: ardb, tglx, mingo, bp, hpa, x86, dvhart, andy
Cc: linux-efi, linux-kernel, platform-driver-x86, linux-mm,
wangkefeng.wang, jingxiangfeng
Add a efi_fake_memmap call in efi_init on arm64.This is useful for
debugging of Address Range Mirroring feature on arm64 platform.
Signed-off-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
---
arch/x86/include/asm/efi.h | 1 -
arch/x86/platform/efi/efi.c | 16 ----------------
drivers/firmware/efi/Kconfig | 2 +-
drivers/firmware/efi/arm-init.c | 1 +
drivers/firmware/efi/memmap.c | 16 ++++++++++++++++
include/linux/efi.h | 1 +
6 files changed, 19 insertions(+), 18 deletions(-)
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 86169a2..127977f 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -158,7 +158,6 @@ extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
extern struct efi_scratch efi_scratch;
extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
extern int __init efi_memblock_x86_reserve_range(void);
-extern void __init efi_print_memmap(void);
extern void __init efi_memory_uc(u64 addr, unsigned long size);
extern void __init efi_map_region(efi_memory_desc_t *md);
extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index ae923ee..4c8793d 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -317,22 +317,6 @@ static void __init efi_clean_memmap(void)
}
}
-void __init efi_print_memmap(void)
-{
- efi_memory_desc_t *md;
- int i = 0;
-
- for_each_efi_memory_desc(md) {
- char buf[64];
-
- pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
- i++, efi_md_typeattr_format(buf, sizeof(buf), md),
- md->phys_addr,
- md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
- (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
- }
-}
-
static int __init efi_systab_init(u64 phys)
{
int size = efi_enabled(EFI_64BIT) ? sizeof(efi_system_table_64_t)
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index ecc83e2..9cf9a96 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -55,7 +55,7 @@ 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.
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index d99f5b0..ac00e7c 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -265,6 +265,7 @@ void __init efi_init(void)
}
reserve_regions();
+ efi_fake_memmap();
efi_esrt_init();
memblock_reserve(params.mmap & PAGE_MASK,
diff --git a/drivers/firmware/efi/memmap.c b/drivers/firmware/efi/memmap.c
index 2ff1883..0155bf0 100644
--- a/drivers/firmware/efi/memmap.c
+++ b/drivers/firmware/efi/memmap.c
@@ -376,3 +376,19 @@ void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
}
}
}
+
+void __init efi_print_memmap(void)
+{
+ efi_memory_desc_t *md;
+ int i = 0;
+
+ for_each_efi_memory_desc(md) {
+ char buf[64];
+
+ pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
+ i++, efi_md_typeattr_format(buf, sizeof(buf), md),
+ md->phys_addr,
+ md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
+ (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
+ }
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 7efd707..bf101e5 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1142,6 +1142,7 @@ static inline bool __pure efi_soft_reserve_enabled(void)
return IS_ENABLED(CONFIG_EFI_SOFT_RESERVE)
&& __efi_soft_reserve_enabled();
}
+extern void __init efi_print_memmap(void);
#else
static inline bool efi_enabled(int feature)
{
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 2/2] arm64/efi: support to find mirrored memory ranges
2020-02-21 12:52 [PATCH 0/2] arm64: Support to find mirrored memory ranges Jing Xiangfeng
2020-02-20 9:21 ` Ard Biesheuvel
2020-02-21 12:52 ` [PATCH 1/2] efi: allow EFI_FAKE_MEMMAP on arm64 platform Jing Xiangfeng
@ 2020-02-21 12:53 ` Jing Xiangfeng
2 siblings, 0 replies; 4+ messages in thread
From: Jing Xiangfeng @ 2020-02-21 12:53 UTC (permalink / raw)
To: ardb, tglx, mingo, bp, hpa, x86, dvhart, andy
Cc: linux-efi, linux-kernel, platform-driver-x86, linux-mm,
wangkefeng.wang, jingxiangfeng
Commit b05b9f5f9dcf ("x86, mirror: x86 enabling - find
mirrored memory ranges") introduced the efi_find_mirror
on x86. Now we can scan the memory map and find mirrored
memory ranges by calling efi_find_mirror on arm64 platform.
For example, if "efi_fake_mem=4G@1G:0x10000,4G@7G:0x10000"
is specified, the original (firmware provided) EFI memmap will be
updated so that the specified memory regions have
EFI_MEMORY_MORE_RELIABLE attribute (0x10000):
<original>
efi: mem02: [Conventional Memory| | | | | | | | | |WB|
| | ] range=[0x0000000040000000-0x00000001b5035fff] (5968MB)
efi: mem28: [Conventional Memory| | | | | | | | | |WB|
| | ] range=[0x00000001c0000000-0x00000002843fffff] (3140MB)
efi: mem29: [Loader Data | | | | | | | | | |WB|
| | ] range=[0x0000000284400000-0x0000000285f18fff] (27MB)
efi: mem30: [Conventional Memory| | | | | | | | | |WB|
| | ] range=[0x0000000285f19000-0x000000033fbfffff] (2972MB)
<updated>
efi: mem02: [Conventional Memory| |MR| | | | | | | |WB|
| | ] range=[0x0000000040000000-0x000000013fffffff] (4096MB)
efi: mem03: [Conventional Memory| | | | | | | | | |WB|
| | ] range=[0x0000000140000000-0x00000001b5035fff] (1872MB)
efi: mem29: [Conventional Memory| |MR| | | | | | | |WB|
| | ] range=[0x00000001c0000000-0x00000002843fffff] (3140MB)
efi: mem30: [Loader Data | |MR| | | | | | | |WB|
| | ] range=[0x0000000284400000-0x0000000285f18fff] (27MB)
efi: mem31: [Conventional Memory| |MR| | | | | | | |WB|
| | ] range=[0x0000000285f19000-0x00000002bfffffff] (928MB)
And you will find that the following message is output:
efi: Memory: 8192M/12352M mirrored memory
Signed-off-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
---
arch/x86/include/asm/efi.h | 4 ----
arch/x86/platform/efi/efi.c | 23 -----------------------
drivers/firmware/efi/arm-init.c | 1 +
drivers/firmware/efi/efi.c | 23 +++++++++++++++++++++++
include/linux/efi.h | 4 ++++
5 files changed, 28 insertions(+), 27 deletions(-)
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index 127977f..24fa6a9 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -330,7 +330,6 @@ static inline void *efi64_zero_upper(void *p)
extern bool efi_reboot_required(void);
extern bool efi_is_table_address(unsigned long phys_addr);
-extern void efi_find_mirror(void);
extern void efi_reserve_boot_services(void);
#else
static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
@@ -342,9 +341,6 @@ static inline bool efi_is_table_address(unsigned long phys_addr)
{
return false;
}
-static inline void efi_find_mirror(void)
-{
-}
static inline void efi_reserve_boot_services(void)
{
}
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 4c8793d..c06603d 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -97,29 +97,6 @@ static int __init setup_add_efi_memmap(char *arg)
}
early_param("add_efi_memmap", setup_add_efi_memmap);
-void __init efi_find_mirror(void)
-{
- efi_memory_desc_t *md;
- u64 mirror_size = 0, total_size = 0;
-
- if (!efi_enabled(EFI_MEMMAP))
- return;
-
- for_each_efi_memory_desc(md) {
- unsigned long long start = md->phys_addr;
- unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
-
- total_size += size;
- if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
- memblock_mark_mirror(start, size);
- mirror_size += size;
- }
- }
- if (mirror_size)
- pr_info("Memory: %lldM/%lldM mirrored memory\n",
- mirror_size>>20, total_size>>20);
-}
-
/*
* Tell the kernel about the EFI memory map. This might include
* more than the max 128 entries that can fit in the passed in e820
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index ac00e7c..f86e73e 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -266,6 +266,7 @@ void __init efi_init(void)
reserve_regions();
efi_fake_memmap();
+ efi_find_mirror();
efi_esrt_init();
memblock_reserve(params.mmap & PAGE_MASK,
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 621220a..664d01d 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -394,6 +394,29 @@ static int __init efisubsys_init(void)
subsys_initcall(efisubsys_init);
+void __init efi_find_mirror(void)
+{
+ efi_memory_desc_t *md;
+ u64 mirror_size = 0, total_size = 0;
+
+ if (!efi_enabled(EFI_MEMMAP))
+ return;
+
+ for_each_efi_memory_desc(md) {
+ unsigned long long start = md->phys_addr;
+ unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
+
+ total_size += size;
+ if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
+ memblock_mark_mirror(start, size);
+ mirror_size += size;
+ }
+ }
+ if (mirror_size)
+ pr_info("Memory: %lldM/%lldM mirrored memory\n",
+ mirror_size>>20, total_size>>20);
+}
+
/*
* Find the efi memory descriptor for a given physical address. Given a
* physical address, determine if it exists within an EFI Memory Map entry,
diff --git a/include/linux/efi.h b/include/linux/efi.h
index bf101e5..bb32e37 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1143,6 +1143,7 @@ static inline bool __pure efi_soft_reserve_enabled(void)
&& __efi_soft_reserve_enabled();
}
extern void __init efi_print_memmap(void);
+extern void efi_find_mirror(void);
#else
static inline bool efi_enabled(int feature)
{
@@ -1161,6 +1162,9 @@ static inline bool efi_soft_reserve_enabled(void)
{
return false;
}
+static inline void efi_find_mirror(void)
+{
+}
#endif
extern int efi_status_to_err(efi_status_t status);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread