Commit a19d66c5 authored by Tom Lendacky's avatar Tom Lendacky Committed by Ingo Molnar

efi: Add an EFI table address match function

Add a function that will determine if a supplied physical address matches
the address of an EFI table.
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Toshimitsu Kani <toshi.kani@hpe.com>
Cc: kasan-dev@googlegroups.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/e1e06441d80f44776df391e0e4cb485b345b7518.1500319216.git.thomas.lendacky@amd.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent d68baa3f
...@@ -55,6 +55,25 @@ struct efi __read_mostly efi = { ...@@ -55,6 +55,25 @@ struct efi __read_mostly efi = {
}; };
EXPORT_SYMBOL(efi); EXPORT_SYMBOL(efi);
static unsigned long *efi_tables[] = {
&efi.mps,
&efi.acpi,
&efi.acpi20,
&efi.smbios,
&efi.smbios3,
&efi.sal_systab,
&efi.boot_info,
&efi.hcdp,
&efi.uga,
&efi.uv_systab,
&efi.fw_vendor,
&efi.runtime,
&efi.config_table,
&efi.esrt,
&efi.properties_table,
&efi.mem_attr_table,
};
static bool disable_runtime; static bool disable_runtime;
static int __init setup_noefi(char *arg) static int __init setup_noefi(char *arg)
{ {
...@@ -855,6 +874,20 @@ int efi_status_to_err(efi_status_t status) ...@@ -855,6 +874,20 @@ int efi_status_to_err(efi_status_t status)
return err; return err;
} }
bool efi_is_table_address(unsigned long phys_addr)
{
unsigned int i;
if (phys_addr == EFI_INVALID_TABLE_ADDR)
return false;
for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
if (*(efi_tables[i]) == phys_addr)
return true;
return false;
}
#ifdef CONFIG_KEXEC #ifdef CONFIG_KEXEC
static int update_efi_random_seed(struct notifier_block *nb, static int update_efi_random_seed(struct notifier_block *nb,
unsigned long code, void *unused) unsigned long code, void *unused)
......
...@@ -1091,6 +1091,8 @@ static inline bool efi_enabled(int feature) ...@@ -1091,6 +1091,8 @@ static inline bool efi_enabled(int feature)
return test_bit(feature, &efi.flags) != 0; return test_bit(feature, &efi.flags) != 0;
} }
extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused); extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
extern bool efi_is_table_address(unsigned long phys_addr);
#else #else
static inline bool efi_enabled(int feature) static inline bool efi_enabled(int feature)
{ {
...@@ -1104,6 +1106,11 @@ efi_capsule_pending(int *reset_type) ...@@ -1104,6 +1106,11 @@ efi_capsule_pending(int *reset_type)
{ {
return false; return false;
} }
static inline bool efi_is_table_address(unsigned long phys_addr)
{
return false;
}
#endif #endif
extern int efi_status_to_err(efi_status_t status); extern int efi_status_to_err(efi_status_t status);
......
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