linux-kernel - [PATCH 04/10] efi: Introduce EFI_MEM_ATTR bit and set it from memory attributes table

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Message-Id: <1485868902-20401-5-git-send-email-ard.biesheuvel@linaro.org>
Date:   Tue, 31 Jan 2017 13:21:36 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     Sai Praneeth <sai.praneeth.prakhya@...el.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-efi@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Ricardo Neri <ricardo.neri@...el.com>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Matt Fleming <matt@...eblueprint.co.uk>
Subject: [PATCH 04/10] efi: Introduce EFI_MEM_ATTR bit and set it from memory attributes table

From: Sai Praneeth <sai.praneeth.prakhya@...el.com>

UEFI v2.6 introduces a configuration table called
EFI_MEMORY_ATTRIBUTES_TABLE which provides additional information about
efi runtime regions. Currently this table describes memory protections
that may be applied to EFI Runtime code and data regions by kernel.
Allocate a EFI_XXX bit to keep track of whether this feature is
published by firmware or not.

Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Reviewed-by: "Lee, Chun-Yi" <jlee@...e.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Ricardo Neri <ricardo.neri@...el.com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Ravi Shankar <ravi.v.shankar@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 drivers/firmware/efi/memattr.c | 1 +
 include/linux/efi.h            | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/firmware/efi/memattr.c b/drivers/firmware/efi/memattr.c
index 236004b9a50d..402197460507 100644
--- a/drivers/firmware/efi/memattr.c
+++ b/drivers/firmware/efi/memattr.c
@@ -43,6 +43,7 @@ int __init efi_memattr_init(void)
 
 	tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size;
 	memblock_reserve(efi.mem_attr_table, tbl_size);
+	set_bit(EFI_MEM_ATTR, &efi.flags);
 
 unmap:
 	early_memunmap(tbl, sizeof(*tbl));
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 6642c4d9d11d..b17f73113bd2 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1065,6 +1065,7 @@ extern int __init efi_setup_pcdp_console(char *);
 #define EFI_ARCH_1		7	/* First arch-specific bit */
 #define EFI_DBG			8	/* Print additional debug info at runtime */
 #define EFI_NX_PE_DATA		9	/* Can runtime data regions be mapped non-executable? */
+#define EFI_MEM_ATTR		10	/* Did firmware publish EFI_MEMORY_ATTRIBUTES table? */
 
 #ifdef CONFIG_EFI
 /*
-- 
2.7.4