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


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent d68baa3f

drivers/firmware/efi/efi.c

+33 −0
Original line number Original line Diff line number Diff line
@@ -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) 
	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)

include/linux/efi.h

+7 −0
Original line number Original line Diff line number Diff line
@@ -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) 
{

{

	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);