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From: Borislav Petkov <bp@alien8.de>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: 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, 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>,
	Wanpeng Li <wanpengli@tencent.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>,
	Michael Roth <michael.roth@amd.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Andi Kleen <ak@linux.intel.com>,
	tony.luck@intel.com, marcorr@google.com,
	sathyanarayanan.kuppuswamy@linux.intel.com
Subject: Re: [PATCH Part1 v5 26/38] x86/compressed/acpi: move EFI config table access to common code
Date: Wed, 25 Aug 2021 17:18:20 +0200	[thread overview]
Message-ID: <YSZfPFrzXv0dImsv@zn.tnic> (raw)
In-Reply-To: <20210820151933.22401-27-brijesh.singh@amd.com>

On Fri, Aug 20, 2021 at 10:19:21AM -0500, Brijesh Singh wrote:
> From: Michael Roth <michael.roth@amd.com>
> 
> Future patches for SEV-SNP-validated CPUID will also require early
> parsing of the EFI configuration. 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/Makefile |   1 +
>  arch/x86/boot/compressed/acpi.c   | 113 +++++--------------
>  arch/x86/boot/compressed/efi.c    | 178 ++++++++++++++++++++++++++++++
>  arch/x86/boot/compressed/misc.h   |  43 ++++++++
>  4 files changed, 251 insertions(+), 84 deletions(-)
>  create mode 100644 arch/x86/boot/compressed/efi.c

Ok, better, but this patch needs splitting. And I have a good idea how:
in at least three patches:

1. Add efi_get_system_table() and use it
2. Add efi_get_conf_table() and use it
3. Add efi_find_vendor_table() and use it

This will facilitate review immensely.

Also, here's a diff ontop of what to do also, style-wise.

- change how you look for the preferred vendor table along with commenting what you do
- shorten variable names so that you don't have so many line breaks.

Thx.

diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 3a3f997d7210..c22b21e94a95 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -20,27 +20,29 @@
  */
 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_table_pa,
-		    unsigned int config_table_len, bool efi_64)
+__efi_get_rsdp_addr(unsigned long cfg_tbl_pa, unsigned int cfg_tbl_len, bool efi_64)
 {
 	acpi_physical_address rsdp_addr = 0;
+
 #ifdef CONFIG_EFI
 	int ret;
 
-	ret = efi_find_vendor_table(config_table_pa, config_table_len,
-				    ACPI_20_TABLE_GUID, efi_64,
-				    (unsigned long *)&rsdp_addr);
-	if (ret == -ENOENT)
-		ret = efi_find_vendor_table(config_table_pa, config_table_len,
-					    ACPI_TABLE_GUID, efi_64,
-					    (unsigned long *)&rsdp_addr);
+	/*
+	 * Search EFI system tables for RSDP. Preferred is ACPI_20_TABLE_GUID to
+	 * ACPI_TABLE_GUID because it has more features.
+	 */
+	ret = efi_find_vendor_table(cfg_tbl_pa, cfg_tbl_len, ACPI_20_TABLE_GUID,
+				    efi_64, (unsigned long *)&rsdp_addr);
+	if (!ret)
+		return rsdp_addr;
+
+	/* No ACPI_20_TABLE_GUID found, fallback to ACPI_TABLE_GUID. */
+	ret = efi_find_vendor_table(cfg_tbl_pa, cfg_tbl_len, ACPI_TABLE_GUID,
+				    efi_64, (unsigned long *)&rsdp_addr);
 	if (ret)
 		debug_putstr("Error getting RSDP address.\n");
+
 #endif
 	return rsdp_addr;
 }
@@ -100,18 +102,16 @@ static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; }
 static acpi_physical_address efi_get_rsdp_addr(void)
 {
 #ifdef CONFIG_EFI
-	unsigned long config_table_pa = 0;
-	unsigned int config_table_len;
+	unsigned long cfg_tbl_pa = 0;
+	unsigned int cfg_tbl_len;
 	bool efi_64;
 	int ret;
 
-	ret = efi_get_conf_table(boot_params, &config_table_pa,
-				 &config_table_len, &efi_64);
-	if (ret || !config_table_pa)
+	ret = efi_get_conf_table(boot_params, &cfg_tbl_pa, &cfg_tbl_len, &efi_64);
+	if (ret || !cfg_tbl_pa)
 		error("EFI config table not found.");
 
-	return __efi_get_rsdp_addr(config_table_pa, config_table_len,
-				   efi_64);
+	return __efi_get_rsdp_addr(cfg_tbl_pa, cfg_tbl_len, efi_64);
 #else
 	return 0;
 #endif
diff --git a/arch/x86/boot/compressed/efi.c b/arch/x86/boot/compressed/efi.c
index 16ff5cb9a1fb..7ed31b943c04 100644
--- a/arch/x86/boot/compressed/efi.c
+++ b/arch/x86/boot/compressed/efi.c
@@ -12,14 +12,14 @@
 #include <asm/efi.h>
 
 /* Get vendor table address/guid from EFI config table at the given index */
-static int get_vendor_table(void *conf_table, unsigned int idx,
+static int get_vendor_table(void *cfg_tbl, unsigned int idx,
 			    unsigned long *vendor_table_pa,
 			    efi_guid_t *vendor_table_guid,
 			    bool efi_64)
 {
 	if (efi_64) {
 		efi_config_table_64_t *table_entry =
-			(efi_config_table_64_t *)conf_table + idx;
+			(efi_config_table_64_t *)cfg_tbl + idx;
 
 		if (!IS_ENABLED(CONFIG_X86_64) &&
 		    table_entry->table >> 32) {
@@ -32,7 +32,7 @@ static int get_vendor_table(void *conf_table, unsigned int idx,
 
 	} else {
 		efi_config_table_32_t *table_entry =
-			(efi_config_table_32_t *)conf_table + idx;
+			(efi_config_table_32_t *)cfg_tbl + idx;
 
 		*vendor_table_pa = table_entry->table;
 		*vendor_table_guid = table_entry->guid;
@@ -45,27 +45,25 @@ static int get_vendor_table(void *conf_table, unsigned int idx,
  * Given EFI config table, search it for the physical address of the vendor
  * table associated with GUID.
  *
- * @conf_table:        pointer to EFI configuration table
- * @conf_table_len:    number of entries in EFI configuration table
+ * @cfg_tbl:        pointer to EFI configuration table
+ * @cfg_tbl_len:    number of entries in EFI configuration table
  * @guid:              GUID of vendor table
  * @efi_64:            true if using 64-bit EFI
  * @vendor_table_pa:   location to store physical address of vendor table
  *
  * Returns 0 on success. On error, return params are left unchanged.
  */
-int
-efi_find_vendor_table(unsigned long conf_table_pa, unsigned int conf_table_len,
-		      efi_guid_t guid, bool efi_64,
-		      unsigned long *vendor_table_pa)
+int efi_find_vendor_table(unsigned long cfg_tbl_pa, unsigned int cfg_tbl_len,
+			  efi_guid_t guid, bool efi_64, unsigned long *vendor_table_pa)
 {
 	unsigned int i;
 
-	for (i = 0; i < conf_table_len; i++) {
+	for (i = 0; i < cfg_tbl_len; i++) {
 		unsigned long vendor_table_pa_tmp;
 		efi_guid_t vendor_table_guid;
 		int ret;
 
-		if (get_vendor_table((void *)conf_table_pa, i,
+		if (get_vendor_table((void *)cfg_tbl_pa, i,
 				     &vendor_table_pa_tmp,
 				     &vendor_table_guid, efi_64))
 			return -EINVAL;
@@ -88,9 +86,8 @@ efi_find_vendor_table(unsigned long conf_table_pa, unsigned int conf_table_len,
  *
  * Returns 0 on success. On error, return params are left unchanged.
  */
-int
-efi_get_system_table(struct boot_params *boot_params,
-		     unsigned long *sys_table_pa, bool *is_efi_64)
+int efi_get_system_table(struct boot_params *boot_params, unsigned long *sys_table_pa,
+			 bool *is_efi_64)
 {
 	unsigned long sys_table;
 	struct efi_info *ei;
@@ -137,22 +134,19 @@ efi_get_system_table(struct boot_params *boot_params,
  * address EFI configuration table.
  *
  * @boot_params:        pointer to boot_params
- * @conf_table_pa:      location to store physical address of config table
- * @conf_table_len:     location to store number of config table entries
+ * @cfg_tbl_pa:      location to store physical address of config table
+ * @cfg_tbl_len:     location to store number of config table entries
  * @is_efi_64:          location to store whether using 64-bit EFI or not
  *
  * Returns 0 on success. On error, return params are left unchanged.
  */
-int
-efi_get_conf_table(struct boot_params *boot_params,
-		   unsigned long *conf_table_pa,
-		   unsigned int *conf_table_len,
-		   bool *is_efi_64)
+int efi_get_conf_table(struct boot_params *boot_params, unsigned long *cfg_tbl_pa,
+		       unsigned int *cfg_tbl_len, bool *is_efi_64)
 {
 	unsigned long sys_table_pa = 0;
 	int ret;
 
-	if (!conf_table_pa || !conf_table_len || !is_efi_64)
+	if (!cfg_tbl_pa || !cfg_tbl_len || !is_efi_64)
 		return -EINVAL;
 
 	ret = efi_get_system_table(boot_params, &sys_table_pa, is_efi_64);
@@ -164,14 +158,14 @@ efi_get_conf_table(struct boot_params *boot_params,
 		efi_system_table_64_t *stbl =
 			(efi_system_table_64_t *)sys_table_pa;
 
-		*conf_table_pa	= stbl->tables;
-		*conf_table_len	= stbl->nr_tables;
+		*cfg_tbl_pa	= stbl->tables;
+		*cfg_tbl_len	= stbl->nr_tables;
 	} else {
 		efi_system_table_32_t *stbl =
 			(efi_system_table_32_t *)sys_table_pa;
 
-		*conf_table_pa	= stbl->tables;
-		*conf_table_len	= stbl->nr_tables;
+		*cfg_tbl_pa	= stbl->tables;
+		*cfg_tbl_len	= stbl->nr_tables;
 	}
 
 	return 0;

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2021-08-25 15:17 UTC|newest]

Thread overview: 123+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 15:18 [PATCH Part1 v5 00/38] Add AMD Secure Nested Paging (SEV-SNP) Guest Support Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 01/38] x86/mm: Add sev_feature_enabled() helper Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 02/38] x86/sev: Shorten GHCB terminate macro names Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 03/38] x86/sev: Get rid of excessive use of defines Brijesh Singh
2021-08-20 15:18 ` [PATCH Part1 v5 04/38] x86/head64: Carve out the guest encryption postprocessing into a helper Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 05/38] x86/sev: Define the Linux specific guest termination reasons Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 06/38] x86/sev: Save the negotiated GHCB version Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 07/38] x86/sev: Add support for hypervisor feature VMGEXIT Brijesh Singh
2021-08-23  9:47   ` Borislav Petkov
2021-08-23 18:25     ` Brijesh Singh
2021-08-23 18:34       ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 08/38] x86/sev: Check SEV-SNP features support Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 09/38] x86/sev: Add a helper for the PVALIDATE instruction Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 10/38] x86/sev: Check the vmpl level Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 11/38] x86/compressed: Add helper for validating pages in the decompression stage Brijesh Singh
2021-08-23 14:16   ` Borislav Petkov
2021-08-23 18:55     ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 12/38] x86/compressed: Register GHCB memory when SEV-SNP is active Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 13/38] x86/sev: " Brijesh Singh
2021-08-23 17:35   ` Borislav Petkov
2021-08-23 18:56     ` Brijesh Singh
2021-08-23 19:45       ` [PATCH] x86/sev: Remove do_early_exception() forward declarations Borislav Petkov
2021-08-23 20:06         ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 14/38] x86/sev: Add helper for validating pages in early enc attribute changes Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 15/38] x86/kernel: Make the bss.decrypted section shared in RMP table Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 16/38] x86/kernel: Validate rom memory before accessing when SEV-SNP is active Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 17/38] x86/mm: Add support to validate memory when changing C-bit Brijesh Singh
2021-08-25 11:06   ` Borislav Petkov
2021-08-25 13:54     ` Brijesh Singh
2021-08-25 14:00       ` Borislav Petkov
2021-08-27 17:09   ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 18/38] KVM: SVM: Define sev_features and vmpl field in the VMSA Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 19/38] KVM: SVM: Create a separate mapping for the SEV-ES save area Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 20/38] KVM: SVM: Create a separate mapping for the GHCB " Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 21/38] KVM: SVM: Update the SEV-ES save area mapping Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 22/38] x86/sev: Use SEV-SNP AP creation to start secondary CPUs Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 23/38] x86/head/64: set up a startup %gs for stack protector Brijesh Singh
2021-08-25 14:29   ` Borislav Petkov
2021-08-25 15:18     ` Michael Roth
2021-08-25 16:29       ` Borislav Petkov
2021-08-27 13:38         ` Michael Roth
2021-08-31  8:03           ` Borislav Petkov
2021-08-31 23:30             ` Michael Roth
2021-08-25 15:07   ` Joerg Roedel
2021-08-25 17:07     ` Michael Roth
2021-08-20 15:19 ` [PATCH Part1 v5 24/38] x86/sev: move MSR-based VMGEXITs for CPUID to helper Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 25/38] KVM: x86: move lookup of indexed CPUID leafs " Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 26/38] x86/compressed/acpi: move EFI config table access to common code Brijesh Singh
2021-08-25 15:18   ` Borislav Petkov [this message]
2021-08-25 17:14     ` Michael Roth
2021-08-20 15:19 ` [PATCH Part1 v5 27/38] x86/boot: Add Confidential Computing type to setup_data Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 28/38] x86/compressed/64: enable SEV-SNP-validated CPUID in #VC handler Brijesh Singh
2021-08-25 19:19   ` Borislav Petkov
2021-08-27 16:46     ` Michael Roth
2021-08-31 10:04       ` Borislav Petkov
2021-09-01  1:03         ` Michael Roth
2021-09-02 10:53           ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 29/38] x86/boot: add a pointer to Confidential Computing blob in bootparams Brijesh Singh
2021-08-27 13:51   ` Borislav Petkov
2021-08-27 18:48     ` Michael Roth
2021-08-20 15:19 ` [PATCH Part1 v5 30/38] x86/compressed/64: store Confidential Computing blob address " Brijesh Singh
2021-08-27 14:15   ` Borislav Petkov
2021-08-27 19:09     ` Michael Roth
2021-08-31 10:26       ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 31/38] x86/compressed/64: add identity mapping for Confidential Computing blob Brijesh Singh
2021-08-27 14:43   ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 32/38] x86/sev: enable SEV-SNP-validated CPUID in #VC handlers Brijesh Singh
2021-08-27 15:18   ` Borislav Petkov
2021-08-27 15:47     ` Brijesh Singh
2021-08-27 16:56       ` Borislav Petkov
2021-08-27 18:39       ` Michael Roth
2021-08-27 18:32     ` Michael Roth
2021-08-30 16:03       ` Michael Roth
2021-08-31 16:22       ` Borislav Petkov
2021-09-01  1:16         ` Michael Roth
2021-09-02 11:05           ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest request NAEs Brijesh Singh
2021-08-27 17:44   ` Borislav Petkov
2021-08-27 18:07     ` Brijesh Singh
2021-08-27 18:13       ` Borislav Petkov
2021-08-27 18:27         ` Brijesh Singh
2021-08-27 18:38           ` Borislav Petkov
2021-08-27 19:57       ` Tom Lendacky
2021-08-27 20:17         ` Borislav Petkov
2021-08-27 20:31           ` Tom Lendacky
2021-08-20 15:19 ` [PATCH Part1 v5 34/38] x86/sev: Add snp_msg_seqno() helper Brijesh Singh
2021-08-27 18:41   ` Borislav Petkov
2021-08-30 15:07     ` Brijesh Singh
2021-09-02 11:26       ` Borislav Petkov
2021-09-02 15:27         ` Brijesh Singh
2021-08-31 20:46   ` Dov Murik
2021-08-31 21:13     ` Brijesh Singh
2021-09-09 14:54   ` Peter Gonda
2021-09-09 15:26     ` Brijesh Singh
2021-09-09 15:43       ` Peter Gonda
2021-09-09 16:17         ` Brijesh Singh
2021-09-09 16:21           ` Peter Gonda
2021-09-09 19:26             ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 35/38] x86/sev: Register SNP guest request platform device Brijesh Singh
2021-08-31 11:37   ` Dov Murik
2021-08-31 16:03     ` Brijesh Singh
2021-09-02 16:40   ` Borislav Petkov
2021-09-02 19:58     ` Brijesh Singh
2021-09-03  8:15       ` Dov Murik
2021-09-03 12:08         ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 36/38] virt: Add SEV-SNP guest driver Brijesh Singh
2021-09-06 17:38   ` Borislav Petkov
2021-09-07 13:35     ` Brijesh Singh
2021-09-08 13:44       ` Borislav Petkov
2021-08-20 15:19 ` [PATCH Part1 v5 37/38] virt: sevguest: Add support to derive key Brijesh Singh
2021-08-31 18:59   ` Dov Murik
2021-08-31 21:04     ` Brijesh Singh
2021-09-01  5:33       ` Dov Murik
2021-09-08 14:00   ` Borislav Petkov
2021-09-08 21:44     ` Brijesh Singh
2021-08-20 15:19 ` [PATCH Part1 v5 38/38] virt: sevguest: Add support to get extended report Brijesh Singh
2021-08-31 20:22   ` Dov Murik
2021-08-31 21:11     ` Brijesh Singh
2021-09-01  8:32       ` Dov Murik
2021-09-08 17:53   ` Borislav Petkov
2021-09-15 11:46     ` Brijesh Singh
2021-09-15 10:02   ` Dr. David Alan Gilbert
2021-09-15 11:53     ` Brijesh Singh

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