From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Fri, 21 Sep 2018 09:32:44 -0700
Subject: efi: honour memory reservations passed via a linux specific config
table
Git-commit: 71e0940d52e107748b270213a01d3b1546657d74
Patch-mainline: v4.20-rc1
References: bsc#1111147 bsc#1117158 bsc#1134671
In order to allow the OS to reserve memory persistently across a
kexec, introduce a Linux-specific UEFI configuration table that
points to the head of a linked list in memory, allowing each kernel
to add list items describing memory regions that the next kernel
should treat as reserved.
This is useful, e.g., for GICv3 based ARM systems that cannot disable
DMA access to the LPI tables, forcing them to reuse the same memory
region again after a kexec reboot.
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
drivers/firmware/efi/efi.c | 25 +++++++++++++++++++++++++
include/linux/efi.h | 8 ++++++++
2 files changed, 33 insertions(+)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -52,6 +52,7 @@ struct efi __read_mostly efi = {
.properties_table = EFI_INVALID_TABLE_ADDR,
.mem_attr_table = EFI_INVALID_TABLE_ADDR,
.rng_seed = EFI_INVALID_TABLE_ADDR,
+ .mem_reserve = EFI_INVALID_TABLE_ADDR,
};
EXPORT_SYMBOL(efi);
@@ -462,6 +463,7 @@ static __initdata efi_config_table_type_
{EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
{EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
{LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi.rng_seed},
+ {LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &efi.mem_reserve},
{NULL_GUID, NULL, NULL},
};
@@ -566,6 +568,29 @@ int __init efi_config_parse_tables(void
early_memunmap(tbl, sizeof(*tbl));
}
+ if (efi.mem_reserve != EFI_INVALID_TABLE_ADDR) {
+ unsigned long prsv = efi.mem_reserve;
+
+ while (prsv) {
+ struct linux_efi_memreserve *rsv;
+
+ /* reserve the entry itself */
+ memblock_reserve(prsv, sizeof(*rsv));
+
+ rsv = early_memremap(prsv, sizeof(*rsv));
+ if (rsv == NULL) {
+ pr_err("Could not map UEFI memreserve entry!\n");
+ return -ENOMEM;
+ }
+
+ if (rsv->size)
+ memblock_reserve(rsv->base, rsv->size);
+
+ prsv = rsv->next;
+ early_memunmap(rsv, sizeof(*rsv));
+ }
+ }
+
return 0;
}
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -622,6 +622,7 @@ void efi_native_runtime_setup(void);
#define LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, 0xb9, 0x0e, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95)
#define LINUX_EFI_LOADER_ENTRY_GUID EFI_GUID(0x4a67b082, 0x0a4c, 0x41cf, 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f)
#define LINUX_EFI_RANDOM_SEED_TABLE_GUID EFI_GUID(0x1ce1e5bc, 0x7ceb, 0x42f2, 0x81, 0xe5, 0x8a, 0xad, 0xf1, 0x80, 0xf5, 0x7b)
+#define LINUX_EFI_MEMRESERVE_TABLE_GUID EFI_GUID(0x888eb0c6, 0x8ede, 0x4ff5, 0xa8, 0xf0, 0x9a, 0xee, 0x5c, 0xb9, 0x77, 0xc2)
typedef struct {
efi_guid_t guid;
@@ -896,6 +897,7 @@ extern struct efi {
unsigned long properties_table; /* properties table */
unsigned long mem_attr_table; /* memory attributes table */
unsigned long rng_seed; /* UEFI firmware random seed */
+ unsigned long mem_reserve; /* Linux EFI memreserve table */
efi_get_time_t *get_time;
efi_set_time_t *set_time;
efi_get_wakeup_time_t *get_wakeup_time;
@@ -1579,4 +1581,10 @@ struct linux_efi_random_seed {
u8 bits[];
};
+struct linux_efi_memreserve {
+ phys_addr_t next;
+ phys_addr_t base;
+ phys_addr_t size;
+};
+
#endif /* _LINUX_EFI_H */