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Message-ID: <164940893623.389.8376155297904980976.tip-bot2@tip-bot2>
Date: Fri, 08 Apr 2022 09:08:56 -0000
From: "tip-bot2 for Michael Roth" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Michael Roth <michael.roth@....com>,
Brijesh Singh <brijesh.singh@....com>,
Borislav Petkov <bp@...e.de>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/sev] x86/compressed/acpi: Move EFI vendor table lookup to helper
The following commit has been merged into the x86/sev branch of tip:
Commit-ID: dee602dd5d1489b5aa4651c561dfbe90eaee1589
Gitweb: https://git.kernel.org/tip/dee602dd5d1489b5aa4651c561dfbe90eaee1589
Author: Michael Roth <michael.roth@....com>
AuthorDate: Thu, 24 Feb 2022 10:56:07 -06:00
Committer: Borislav Petkov <bp@...e.de>
CommitterDate: Wed, 06 Apr 2022 17:07:19 +02:00
x86/compressed/acpi: Move EFI vendor table lookup to helper
Future patches for SEV-SNP-validated CPUID will also require early
parsing of the EFI configuration. Incrementally move the related code
into a set of helpers that can be re-used for that purpose.
[ bp: Unbreak unnecessarily broken lines. ]
Signed-off-by: Michael Roth <michael.roth@....com>
Signed-off-by: Brijesh Singh <brijesh.singh@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lore.kernel.org/r/20220307213356.2797205-28-brijesh.singh@amd.com
---
arch/x86/boot/compressed/acpi.c | 68 ++++++++++---------------------
arch/x86/boot/compressed/efi.c | 70 ++++++++++++++++++++++++++++++++-
arch/x86/boot/compressed/misc.h | 13 ++++++-
3 files changed, 106 insertions(+), 45 deletions(-)
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 9a824af..b0c1dff 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -20,48 +20,31 @@
*/
struct mem_vector immovable_mem[MAX_NUMNODES*2];
-/*
- * Search EFI system tables for RSDP. If both ACPI_20_TABLE_GUID and
- * ACPI_TABLE_GUID are found, take the former, which has more features.
- */
static acpi_physical_address
-__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables,
- bool efi_64)
+__efi_get_rsdp_addr(unsigned long cfg_tbl_pa, unsigned int cfg_tbl_len)
{
- acpi_physical_address rsdp_addr = 0;
-
#ifdef CONFIG_EFI
- int i;
-
- /* Get EFI tables from systab. */
- for (i = 0; i < nr_tables; i++) {
- acpi_physical_address table;
- efi_guid_t guid;
-
- if (efi_64) {
- efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables + i;
-
- guid = tbl->guid;
- table = tbl->table;
-
- if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) {
- debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n");
- return 0;
- }
- } else {
- efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables + i;
-
- guid = tbl->guid;
- table = tbl->table;
- }
+ unsigned long rsdp_addr;
+ int ret;
- if (!(efi_guidcmp(guid, ACPI_TABLE_GUID)))
- rsdp_addr = table;
- else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID)))
- return table;
- }
+ /*
+ * Search EFI system tables for RSDP. Preferred is ACPI_20_TABLE_GUID to
+ * ACPI_TABLE_GUID because it has more features.
+ */
+ rsdp_addr = efi_find_vendor_table(boot_params, cfg_tbl_pa, cfg_tbl_len,
+ ACPI_20_TABLE_GUID);
+ if (rsdp_addr)
+ return (acpi_physical_address)rsdp_addr;
+
+ /* No ACPI_20_TABLE_GUID found, fallback to ACPI_TABLE_GUID. */
+ rsdp_addr = efi_find_vendor_table(boot_params, cfg_tbl_pa, cfg_tbl_len,
+ ACPI_TABLE_GUID);
+ if (rsdp_addr)
+ return (acpi_physical_address)rsdp_addr;
+
+ debug_putstr("Error getting RSDP address.\n");
#endif
- return rsdp_addr;
+ return 0;
}
/* EFI/kexec support is 64-bit only. */
@@ -109,7 +92,7 @@ static acpi_physical_address kexec_get_rsdp_addr(void)
if (!systab)
error("EFI system table not found in kexec boot_params.");
- return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true);
+ return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables);
}
#else
static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; }
@@ -123,15 +106,10 @@ static acpi_physical_address efi_get_rsdp_addr(void)
unsigned long systab_pa;
unsigned int nr_tables;
enum efi_type et;
- bool efi_64;
int ret;
et = efi_get_type(boot_params);
- if (et == EFI_TYPE_64)
- efi_64 = true;
- else if (et == EFI_TYPE_32)
- efi_64 = false;
- else
+ if (et == EFI_TYPE_NONE)
return 0;
systab_pa = efi_get_system_table(boot_params);
@@ -142,7 +120,7 @@ static acpi_physical_address efi_get_rsdp_addr(void)
if (ret || !cfg_tbl_pa)
error("EFI config table not found.");
- return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len, efi_64);
+ return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len);
#else
return 0;
#endif
diff --git a/arch/x86/boot/compressed/efi.c b/arch/x86/boot/compressed/efi.c
index 350838e..4d363df 100644
--- a/arch/x86/boot/compressed/efi.c
+++ b/arch/x86/boot/compressed/efi.c
@@ -120,3 +120,73 @@ int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa,
return 0;
}
+
+/* Get vendor table address/guid from EFI config table at the given index */
+static int get_vendor_table(void *cfg_tbl, unsigned int idx,
+ unsigned long *vendor_tbl_pa,
+ efi_guid_t *vendor_tbl_guid,
+ enum efi_type et)
+{
+ if (et == EFI_TYPE_64) {
+ efi_config_table_64_t *tbl_entry = (efi_config_table_64_t *)cfg_tbl + idx;
+
+ if (!IS_ENABLED(CONFIG_X86_64) && tbl_entry->table >> 32) {
+ debug_putstr("Error: EFI config table entry located above 4GB.\n");
+ return -EINVAL;
+ }
+
+ *vendor_tbl_pa = tbl_entry->table;
+ *vendor_tbl_guid = tbl_entry->guid;
+
+ } else if (et == EFI_TYPE_32) {
+ efi_config_table_32_t *tbl_entry = (efi_config_table_32_t *)cfg_tbl + idx;
+
+ *vendor_tbl_pa = tbl_entry->table;
+ *vendor_tbl_guid = tbl_entry->guid;
+ } else {
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * efi_find_vendor_table - Given EFI config table, search it for the physical
+ * address of the vendor table associated with GUID.
+ *
+ * @bp: pointer to boot_params
+ * @cfg_tbl_pa: pointer to EFI configuration table
+ * @cfg_tbl_len: number of entries in EFI configuration table
+ * @guid: GUID of vendor table
+ *
+ * Return: vendor table address on success. On error, return 0.
+ */
+unsigned long efi_find_vendor_table(struct boot_params *bp,
+ unsigned long cfg_tbl_pa,
+ unsigned int cfg_tbl_len,
+ efi_guid_t guid)
+{
+ enum efi_type et;
+ unsigned int i;
+
+ et = efi_get_type(bp);
+ if (et == EFI_TYPE_NONE)
+ return 0;
+
+ for (i = 0; i < cfg_tbl_len; i++) {
+ unsigned long vendor_tbl_pa;
+ efi_guid_t vendor_tbl_guid;
+ int ret;
+
+ ret = get_vendor_table((void *)cfg_tbl_pa, i,
+ &vendor_tbl_pa,
+ &vendor_tbl_guid, et);
+ if (ret)
+ return 0;
+
+ if (!efi_guidcmp(guid, vendor_tbl_guid))
+ return vendor_tbl_pa;
+ }
+
+ return 0;
+}
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 8815af0..ba538af 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -23,6 +23,7 @@
#include <linux/screen_info.h>
#include <linux/elf.h>
#include <linux/io.h>
+#include <linux/efi.h>
#include <asm/page.h>
#include <asm/boot.h>
#include <asm/bootparam.h>
@@ -188,6 +189,10 @@ enum efi_type efi_get_type(struct boot_params *bp);
unsigned long efi_get_system_table(struct boot_params *bp);
int efi_get_conf_table(struct boot_params *bp, unsigned long *cfg_tbl_pa,
unsigned int *cfg_tbl_len);
+unsigned long efi_find_vendor_table(struct boot_params *bp,
+ unsigned long cfg_tbl_pa,
+ unsigned int cfg_tbl_len,
+ efi_guid_t guid);
#else
static inline enum efi_type efi_get_type(struct boot_params *bp)
{
@@ -205,6 +210,14 @@ static inline int efi_get_conf_table(struct boot_params *bp,
{
return -ENOENT;
}
+
+static inline unsigned long efi_find_vendor_table(struct boot_params *bp,
+ unsigned long cfg_tbl_pa,
+ unsigned int cfg_tbl_len,
+ efi_guid_t guid)
+{
+ return 0;
+}
#endif /* CONFIG_EFI */
#endif /* BOOT_COMPRESSED_MISC_H */
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