From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Lendacky Subject: [RFC PATCH v4 12/28] efi: Add an EFI table address match function Date: Thu, 16 Feb 2017 09:44:41 -0600 Message-ID: <20170216154441.19244.96367.stgit@tlendack-t1.amdoffice.net> References: <20170216154158.19244.66630.stgit@tlendack-t1.amdoffice.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170216154158.19244.66630.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kasan-dev-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: Rik van Riel , Larry Woodman , Brijesh Singh , Toshimitsu Kani , Arnd Bergmann , Jonathan Corbet , Matt Fleming , Radim =?utf-8?b?S3LEjW3DocWZ?= , Andrey Ryabinin , Ingo Molnar , "Michael S. Tsirkin" , Andy Lutomirski , "H. Peter Anvin" , Borislav Petkov , Paolo Bonzini , Alexander Potapenko , Thomas Gleixner , Dmitry Vyukov List-Id: iommu@lists.linux-foundation.org This patch adds support that will determine if a supplied physical address matches the address of an EFI table. Signed-off-by: Tom Lendacky --- 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 e7d4040..e8dbcdf 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_table_address_match(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 94d34e0..7694b23 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1079,6 +1079,8 @@ 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_table_address_match(unsigned long phys_addr); #else static inline bool efi_enabled(int feature) { @@ -1092,6 +1094,11 @@ static inline bool efi_enabled(int feature) { return false; } + +static inline bool efi_table_address_match(unsigned long phys_addr) +{ + return false; +} #endif extern int efi_status_to_err(efi_status_t status);