From: Brijesh Singh <brijesh.singh@amd.com>
To: <x86@kernel.org>, <linux-kernel@vger.kernel.org>,
<kvm@vger.kernel.org>, <linux-efi@vger.kernel.org>,
<platform-driver-x86@vger.kernel.org>,
<linux-coco@lists.linux.dev>, <linux-mm@kvack.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
Tom Lendacky <thomas.lendacky@amd.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Ard Biesheuvel <ardb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
Jim Mattson <jmattson@google.com>,
"Andy Lutomirski" <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
"Peter Zijlstra" <peterz@infradead.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
David Rientjes <rientjes@google.com>,
Dov Murik <dovmurik@linux.ibm.com>,
Tobin Feldman-Fitzthum <tobin@ibm.com>,
Borislav Petkov <bp@alien8.de>,
Michael Roth <michael.roth@amd.com>,
Vlastimil Babka <vbabka@suse.cz>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Andi Kleen <ak@linux.intel.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
<brijesh.ksingh@gmail.com>, <tony.luck@intel.com>,
<marcorr@google.com>,
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Brijesh Singh <brijesh.singh@amd.com>
Subject: [PATCH v9 27/43] x86/compressed/acpi: Move EFI vendor table lookup to helper
Date: Fri, 28 Jan 2022 11:17:48 -0600 [thread overview]
Message-ID: <20220128171804.569796-28-brijesh.singh@amd.com> (raw)
In-Reply-To: <20220128171804.569796-1-brijesh.singh@amd.com>
From: Michael Roth <michael.roth@amd.com>
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.
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
arch/x86/boot/compressed/acpi.c | 67 +++++++++++-------------------
arch/x86/boot/compressed/efi.c | 72 +++++++++++++++++++++++++++++++++
arch/x86/boot/compressed/misc.h | 13 ++++++
3 files changed, 108 insertions(+), 44 deletions(-)
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 9a824af69961..d505335bcc25 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; }
@@ -127,11 +110,7 @@ static acpi_physical_address efi_get_rsdp_addr(void)
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 +121,7 @@ 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 feb00c6b4919..6413a808b2e7 100644
--- a/arch/x86/boot/compressed/efi.c
+++ b/arch/x86/boot/compressed/efi.c
@@ -122,3 +122,75 @@ int efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_p
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.
+ *
+ * @boot_params: 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 *boot_params,
+ 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(boot_params);
+ 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 162dbd7443eb..991b46170914 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 *boot_params);
unsigned long efi_get_system_table(struct boot_params *boot_params);
int efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_pa,
unsigned int *cfg_tbl_len);
+unsigned long efi_find_vendor_table(struct boot_params *boot_params,
+ 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 *boot_params)
{
@@ -205,6 +210,14 @@ static inline int efi_get_conf_table(struct boot_params *boot_params,
{
return -ENOENT;
}
+
+static inline unsigned long efi_find_vendor_table(struct boot_params *boot_params,
+ unsigned long cfg_tbl_pa,
+ unsigned int cfg_tbl_len,
+ efi_guid_t guid)
+{
+ return 0;
+}
#endif /* CONFIG_EFI */
#endif /* BOOT_COMPRESSED_MISC_H */
--
2.25.1
next prev parent reply other threads:[~2022-01-28 17:20 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 17:17 [PATCH v9 00/43] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 01/43] KVM: SVM: Define sev_features and vmpl field in the VMSA Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 02/43] KVM: SVM: Create a separate mapping for the SEV-ES save area Brijesh Singh
2022-02-01 13:02 ` Borislav Petkov
2022-02-09 15:02 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 03/43] KVM: SVM: Create a separate mapping for the GHCB " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 04/43] KVM: SVM: Update the SEV-ES save area mapping Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 05/43] x86/compressed/64: Detect/setup SEV/SME features earlier in boot Brijesh Singh
2022-02-01 18:08 ` Borislav Petkov
2022-02-01 20:35 ` Michael Roth
2022-02-01 21:28 ` Borislav Petkov
2022-02-02 0:52 ` Michael Roth
2022-02-02 6:09 ` Borislav Petkov
2022-02-02 17:28 ` Michael Roth
2022-02-02 18:57 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 06/43] x86/sev: " Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 07/43] x86/mm: Extend cc_attr to include AMD SEV-SNP Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 08/43] x86/sev: Define the Linux specific guest termination reasons Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 09/43] x86/sev: Save the negotiated GHCB version Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 10/43] x86/sev: Check SEV-SNP features support Brijesh Singh
2022-02-01 19:59 ` Borislav Petkov
2022-02-02 14:28 ` Brijesh Singh
2022-02-02 15:37 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 11/43] x86/sev: Add a helper for the PVALIDATE instruction Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 12/43] x86/sev: Check the vmpl level Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 13/43] x86/compressed: Add helper for validating pages in the decompression stage Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 14/43] x86/compressed: Register GHCB memory when SEV-SNP is active Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 15/43] x86/sev: " Brijesh Singh
2022-02-02 10:34 ` Borislav Petkov
2022-02-02 14:29 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 16/43] x86/sev: Add helper for validating pages in early enc attribute changes Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 17/43] x86/kernel: Make the .bss..decrypted section shared in RMP table Brijesh Singh
2022-02-02 11:06 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 18/43] x86/kernel: Validate ROM memory before accessing when SEV-SNP is active Brijesh Singh
2022-02-02 15:41 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 19/43] x86/mm: Add support to validate memory when changing C-bit Brijesh Singh
2022-02-02 16:10 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 20/43] x86/sev: Use SEV-SNP AP creation to start secondary CPUs Brijesh Singh
2022-02-03 6:50 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 21/43] x86/head/64: Re-enable stack protection Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 22/43] x86/sev: Move MSR-based VMGEXITs for CPUID to helper Brijesh Singh
2022-02-03 13:59 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 23/43] KVM: x86: Move lookup of indexed CPUID leafs " Brijesh Singh
2022-02-03 15:16 ` Borislav Petkov
2022-02-03 16:44 ` Michael Roth
2022-02-05 12:58 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 24/43] x86/compressed/acpi: Move EFI detection " Brijesh Singh
2022-02-03 14:39 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 25/43] x86/compressed/acpi: Move EFI system table lookup " Brijesh Singh
2022-02-03 14:48 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 26/43] x86/compressed/acpi: Move EFI config " Brijesh Singh
2022-02-03 15:13 ` Borislav Petkov
2022-01-28 17:17 ` Brijesh Singh [this message]
2022-01-28 17:17 ` [PATCH v9 28/43] x86/compressed/acpi: Move EFI kexec handling into common code Brijesh Singh
2022-02-04 16:09 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 29/43] x86/boot: Add Confidential Computing type to setup_data Brijesh Singh
2022-02-04 16:21 ` Borislav Petkov
2022-02-04 17:41 ` Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 30/43] KVM: SEV: Add documentation for SEV-SNP CPUID Enforcement Brijesh Singh
2022-02-07 23:48 ` Sean Christopherson
2022-02-08 14:54 ` Michael Roth
2022-02-08 15:11 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 31/43] x86/compressed/64: Add support for SEV-SNP CPUID table in #VC handlers Brijesh Singh
2022-02-05 10:54 ` Borislav Petkov
2022-02-05 15:42 ` Michael Roth
2022-02-05 16:22 ` Michael Roth
2022-02-06 13:37 ` Borislav Petkov
2022-02-07 15:37 ` Michael Roth
2022-02-07 17:52 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 32/43] x86/boot: Add a pointer to Confidential Computing blob in bootparams Brijesh Singh
2022-02-05 13:07 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 33/43] x86/compressed: Add SEV-SNP feature detection/setup Brijesh Singh
2022-02-06 16:41 ` Borislav Petkov
2022-02-08 13:50 ` Michael Roth
2022-02-08 15:02 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 34/43] x86/compressed: Use firmware-validated CPUID leaves for SEV-SNP guests Brijesh Singh
2022-01-28 17:17 ` [PATCH v9 35/43] x86/compressed: Export and rename add_identity_map() Brijesh Singh
2022-02-06 19:01 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 36/43] x86/compressed/64: Add identity mapping for Confidential Computing blob Brijesh Singh
2022-02-06 19:21 ` Borislav Petkov
2022-01-28 17:17 ` [PATCH v9 37/43] x86/sev: Add SEV-SNP feature detection/setup Brijesh Singh
2022-02-06 19:38 ` Borislav Petkov
2022-02-08 5:25 ` Michael Roth
2022-01-28 17:17 ` [PATCH v9 38/43] x86/sev: Use firmware-validated CPUID for SEV-SNP guests Brijesh Singh
2022-02-05 17:19 ` Michael Roth
2022-02-06 15:46 ` Borislav Petkov
2022-02-07 17:00 ` Michael Roth
2022-02-07 18:43 ` Borislav Petkov
2022-02-06 19:50 ` Borislav Petkov
2022-01-28 17:18 ` [PATCH v9 39/43] x86/sev: Provide support for SNP guest request NAEs Brijesh Singh
2022-02-01 20:17 ` Peter Gonda
2022-01-28 17:18 ` [PATCH v9 40/43] x86/sev: Register SEV-SNP guest request platform device Brijesh Singh
2022-02-01 20:21 ` Peter Gonda
2022-02-02 16:27 ` Brijesh Singh
2022-02-06 20:05 ` Borislav Petkov
2022-01-28 17:18 ` [PATCH v9 41/43] virt: Add SEV-SNP guest driver Brijesh Singh
2022-02-01 20:33 ` Peter Gonda
2022-02-06 22:39 ` Borislav Petkov
2022-02-07 14:41 ` Brijesh Singh
2022-02-07 15:22 ` Borislav Petkov
2022-01-28 17:18 ` [PATCH v9 42/43] virt: sevguest: Add support to derive key Brijesh Singh
2022-02-01 20:39 ` Peter Gonda
2022-02-02 22:31 ` Brijesh Singh
2022-02-07 8:52 ` Borislav Petkov
2022-02-07 16:23 ` Brijesh Singh
2022-02-07 19:09 ` Dov Murik
2022-02-07 20:08 ` Brijesh Singh
2022-02-07 20:28 ` Borislav Petkov
2022-02-08 7:56 ` Dov Murik
2022-02-08 10:51 ` Borislav Petkov
2022-02-08 14:14 ` Brijesh Singh
2022-01-28 17:18 ` [PATCH v9 43/43] virt: sevguest: Add support to get extended report Brijesh Singh
2022-02-01 20:43 ` Peter Gonda
2022-02-07 9:16 ` Borislav Petkov
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