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Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , tony.luck@intel.com, npmccallum@redhat.com, brijesh.ksingh@gmail.com, Brijesh Singh Subject: [PATCH Part1 RFC v4 28/36] x86/compressed/64: store Confidential Computing blob address in bootparams Date: Wed, 7 Jul 2021 13:14:58 -0500 Message-Id: <20210707181506.30489-29-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210707181506.30489-1-brijesh.singh@amd.com> References: <20210707181506.30489-1-brijesh.singh@amd.com> X-ClientProxiedBy: SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) To BYAPR12MB2711.namprd12.prod.outlook.com (2603:10b6:a03:63::10) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA0PR11CA0104.namprd11.prod.outlook.com (2603:10b6:806:d1::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.19 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: a6aa2024-a2c1-480e-cea1-08d941735de0 X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB2711.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2021 18:16:40.3483 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Lsxl3ONComGNhuhU3ShqtB3UYIWuiuQggRQ29ZBM4sKPMIUzy+uCG7q8gi1E4+fIFyXP9EMbZftPj12z1hgu8Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB3527 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Michael Roth When the Confidential Computing blob is located by the boot/compressed kernel, store a pointer to it in bootparams->cc_blob_address to avoid the need for the run-time kernel to rescan the EFI config table to find it again. Since this function is also shared by the run-time kernel, this patch also adds the logic to make use of bootparams->cc_blob_address when it has been initialized. Signed-off-by: Michael Roth Signed-off-by: Brijesh Singh --- arch/x86/kernel/sev-shared.c | 38 +++++++++++++++++++++++++----------- 1 file changed, 27 insertions(+), 11 deletions(-) diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 5e0e8e208a8c..23328727caf4 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -820,7 +820,6 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghcb, return ES_OK; } -#ifdef BOOT_COMPRESSED static struct setup_data *get_cc_setup_data(struct boot_params *bp) { struct setup_data *hdr = (struct setup_data *)bp->hdr.setup_data; @@ -840,6 +839,16 @@ static struct setup_data *get_cc_setup_data(struct boot_params *bp) * 1) Search for CC blob in the following order/precedence: * - via linux boot protocol / setup_data entry * - via EFI configuration table + * 2) If found, initialize boot_params->cc_blob_address to point to the + * blob so that uncompressed kernel can easily access it during very + * early boot without the need to re-parse EFI config table + * 3) Return a pointer to the CC blob, NULL otherwise. + * + * For run-time/uncompressed kernel: + * + * 1) Search for CC blob in the following order/precedence: + * - via linux boot protocol / setup_data entry + * - via boot_params->cc_blob_address * 2) Return a pointer to the CC blob, NULL otherwise. */ static struct cc_blob_sev_info *sev_snp_probe_cc_blob(struct boot_params *bp) @@ -857,27 +866,34 @@ static struct cc_blob_sev_info *sev_snp_probe_cc_blob(struct boot_params *bp) goto out_verify; } +#ifdef __BOOT_COMPRESSED /* CC blob isn't in setup_data, see if it's in the EFI config table */ (void)efi_bp_find_vendor_table(bp, EFI_CC_BLOB_GUID, (unsigned long *)&cc_info); +#else + /* + * CC blob isn't in setup_data, see if boot kernel passed it via + * boot_params. + */ + if (bp->cc_blob_address) + cc_info = (struct cc_blob_sev_info *)(unsigned long)bp->cc_blob_address; +#endif out_verify: /* CC blob should be either valid or not present. Fail otherwise. */ if (cc_info && cc_info->magic != CC_BLOB_SEV_HDR_MAGIC) sev_es_terminate(1, GHCB_SNP_UNSUPPORTED); +#ifdef __BOOT_COMPRESSED + /* + * Pass run-time kernel a pointer to CC info via boot_params for easier + * access during early boot. + */ + bp->cc_blob_address = (u32)(unsigned long)cc_info; +#endif + return cc_info; } -#else -/* - * Probing for CC blob for run-time kernel will be enabled in a subsequent - * patch. For now we need to stub this out. - */ -static struct cc_blob_sev_info *sev_snp_probe_cc_blob(struct boot_params *bp) -{ - return NULL; -} -#endif /* * Initial set up of CPUID table when running identity-mapped.