efi: Add support for the EFI_MEMORY_ATTRIBUTES_TABLE config table

This declares the GUID and struct typedef for the new memory attributes
table which contains the permissions that can be used to apply stricter
permissions to UEFI Runtime Services memory regions.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-13-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index f7d36c6cc1ad9207aee4aa1f668444deee211e65..583e647912a5d32abb0beb9fec1d5e175a2f60aa 100644 (file)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -43,6 +43,7 @@ struct efi __read_mostly efi = {
        .config_table           = EFI_INVALID_TABLE_ADDR,
        .esrt                   = EFI_INVALID_TABLE_ADDR,
        .properties_table       = EFI_INVALID_TABLE_ADDR,
+       .mem_attr_table         = EFI_INVALID_TABLE_ADDR,
 };
 EXPORT_SYMBOL(efi);
 
@@ -338,6 +339,7 @@ static __initdata efi_config_table_type_t common_tables[] = {
        {UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
        {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
        {EFI_PROPERTIES_TABLE_GUID, "PROP", &efi.properties_table},
+       {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi.mem_attr_table},
        {NULL_GUID, NULL, NULL},
 };
 

diff --git a/include/linux/efi.h b/include/linux/efi.h
index c2c0da49876e0de4969ff086583afbbb761ea67b..81af5feba1f760433680575050455c72acc5f0e5 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -623,6 +623,10 @@ void efi_native_runtime_setup(void);
        EFI_GUID(0x3152bca5, 0xeade, 0x433d, \
                 0x86, 0x2e, 0xc0, 0x1c, 0xdc, 0x29, 0x1f, 0x44)
 
+#define EFI_MEMORY_ATTRIBUTES_TABLE_GUID \
+       EFI_GUID(0xdcfa911d, 0x26eb, 0x469f, \
+                0xa2, 0x20, 0x38, 0xb7, 0xdc, 0x46, 0x12, 0x20)
+
 typedef struct {
        efi_guid_t guid;
        u64 table;
@@ -847,6 +851,14 @@ typedef struct {
 
 #define EFI_INVALID_TABLE_ADDR         (~0UL)
 
+typedef struct {
+       u32 version;
+       u32 num_entries;
+       u32 desc_size;
+       u32 reserved;
+       efi_memory_desc_t entry[0];
+} efi_memory_attributes_table_t;
+
 /*
  * All runtime access to EFI goes through this structure:
  */
@@ -868,6 +880,7 @@ extern struct efi {
        unsigned long config_table;     /* config tables */
        unsigned long esrt;             /* ESRT table */
        unsigned long properties_table; /* properties table */
+       unsigned long mem_attr_table;   /* memory attributes table */
        efi_get_time_t *get_time;
        efi_set_time_t *set_time;
        efi_get_wakeup_time_t *get_wakeup_time;