linux-kernel - [tip:x86/mm] efi: Add an EFI table address match function

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Date:   Tue, 18 Jul 2017 03:53:03 -0700
From:   tip-bot for Tom Lendacky <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     luto@...nel.org, lwoodman@...hat.com, linux-kernel@...r.kernel.org,
        riel@...hat.com, tglx@...utronix.de, matt@...eblueprint.co.uk,
        brijesh.singh@....com, dvyukov@...gle.com, konrad.wilk@...cle.com,
        bp@...e.de, corbet@....net, mingo@...nel.org, rkrcmar@...hat.com,
        bp@...en8.de, mst@...hat.com, dyoung@...hat.com, glider@...gle.com,
        peterz@...radead.org, pbonzini@...hat.com, toshi.kani@....com,
        torvalds@...ux-foundation.org, arnd@...db.de, hpa@...or.com,
        thomas.lendacky@....com, aryabinin@...tuozzo.com
Subject: [tip:x86/mm] efi: Add an EFI table address match function

Commit-ID:  a19d66c56af1c52b8b463bf94d21116ae8c1aa5a
Gitweb:     http://git.kernel.org/tip/a19d66c56af1c52b8b463bf94d21116ae8c1aa5a
Author:     Tom Lendacky <thomas.lendacky@....com>
AuthorDate: Mon, 17 Jul 2017 16:10:13 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 18 Jul 2017 11:38:01 +0200

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: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Matt Fleming <matt@...eblueprint.co.uk>
Reviewed-by: Borislav Petkov <bp@...e.de>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brijesh Singh <brijesh.singh@....com>
Cc: Dave Young <dyoung@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Larry Woodman <lwoodman@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Toshimitsu Kani <toshi.kani@....com>
Cc: kasan-dev@...glegroups.com
Cc: kvm@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: linux-efi@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/e1e06441d80f44776df391e0e4cb485b345b7518.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/firmware/efi/efi.c | 33 +++++++++++++++++++++++++++++++++
 include/linux/efi.h        |  7 +++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 045d6d3..69d4d13 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -55,6 +55,25 @@ struct efi __read_mostly 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 int __init setup_noefi(char *arg)
 {
@@ -855,6 +874,20 @@ int efi_status_to_err(efi_status_t status)
 	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
 static int update_efi_random_seed(struct notifier_block *nb,
 				  unsigned long code, void *unused)
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 8269bcb..8e24f09 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1091,6 +1091,8 @@ static inline bool efi_enabled(int feature)
 	return test_bit(feature, &efi.flags) != 0;
 }
 extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
+
+extern bool efi_is_table_address(unsigned long phys_addr);
 #else
 static inline bool efi_enabled(int feature)
 {
@@ -1104,6 +1106,11 @@ efi_capsule_pending(int *reset_type)
 {
 	return false;
 }
+
+static inline bool efi_is_table_address(unsigned long phys_addr)
+{
+	return false;
+}
 #endif
 
 extern int efi_status_to_err(efi_status_t status);