From patchwork Mon Feb 20 18:38:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Roth X-Patchwork-Id: 13146914 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C59D6C64EC7 for ; Mon, 20 Feb 2023 18:50:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232779AbjBTSuR (ORCPT ); Mon, 20 Feb 2023 13:50:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58788 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232433AbjBTSt5 (ORCPT ); Mon, 20 Feb 2023 13:49:57 -0500 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on20626.outbound.protection.outlook.com [IPv6:2a01:111:f400:fe59::626]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C1BB521291; Mon, 20 Feb 2023 10:49:27 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Ba2sPBd6+TvO80X9LCAwVcJUYUC/iSF0XjskWsZfRdXx8/1vFHnoAUGqFmelJU06IHEVrcQZ+o9mBpYaeyre/Q1zk/mXJZwOL6v+NxA48DuyHpkkPXU1TTTu+clcKolKcngQyqFqKIfBBXLxr9w5wgur/P8IOTeh7aZTv12XebpN7yffqszZLaOiW/nel10/pnRrOZYF4ciUSt2C2V4DRejp8AE0BEC7/8eqvnKxkUXRfEhWupvGfFwnTnYj/dFu+DZ5QNZsbfQlYLqXnpwOuzTQhk1eUi5Uh7t20/y1cPdGOs+Db+w0CDw8URZ/uE5sIb7PsHgFPF+7+9YNBGY1Ww== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=cqs+ScbwS9SaGm6GdjYtLpsrVAyQkW77Y2/rbuGN220=; b=I9qTrKGkNzQgKmMWp6z5KOd3uOJCL0eopg+/vuTR9J0XMwnH4TOV04vLvCDMXCMw0vtKh6UQWd0bOqaFFjr5d61B9HPv9BA9J5a3PV0jYVGcYyJ0DMLd9PFtPF7ZSeRPUTQ5/Yrqdi0OO4vIm4dDqnF4McWS/Yy1vTZBxJLQOGQO9qWpg7l8KIYMYJJVImN+EV3KF99j1k1Lqy2bNwAmlG8IPwIFr7CQu1tTpF8j/X22rqhtyRDOqU8HbwGcBZbEyqKagfOHpnUatnWlIKjdoy3ofav9KXqJMlNGb6wVN2FP+N7ScPNF3IEun7xK0VhLULnGkwzeSkNcKR8RCEbPpA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cqs+ScbwS9SaGm6GdjYtLpsrVAyQkW77Y2/rbuGN220=; b=TjAb+zXalch/7DwFUedEqazxoO10/TnxHgh/exabkwtw4gOPqrbRfUaWKqvxjHHYnALQq8s54xpn2iXEkaSQmXmJMIdT8gdOrn7nVxClTz7L7qZ5Bq2c4sz9SqvzdCRIJnyRlWZ3s1wj0jUVpzGuuYcSYEl/Bs9jZaQ1z9MVUdw= Received: from CY5PR10CA0024.namprd10.prod.outlook.com (2603:10b6:930:1c::24) by DM6PR12MB5518.namprd12.prod.outlook.com (2603:10b6:5:1b9::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6111.20; Mon, 20 Feb 2023 18:49:08 +0000 Received: from CY4PEPF0000C966.namprd02.prod.outlook.com (2603:10b6:930:1c:cafe::39) by CY5PR10CA0024.outlook.office365.com (2603:10b6:930:1c::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6111.20 via Frontend Transport; Mon, 20 Feb 2023 18:49:08 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CY4PEPF0000C966.mail.protection.outlook.com (10.167.241.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6134.14 via Frontend Transport; Mon, 20 Feb 2023 18:49:08 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Mon, 20 Feb 2023 12:49:07 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh Subject: [PATCH RFC v8 24/56] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Date: Mon, 20 Feb 2023 12:38:15 -0600 Message-ID: <20230220183847.59159-25-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230220183847.59159-1-michael.roth@amd.com> References: <20230220183847.59159-1-michael.roth@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000C966:EE_|DM6PR12MB5518:EE_ X-MS-Office365-Filtering-Correlation-Id: 31847463-33b7-4e3a-bf70-08db13732635 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(396003)(136003)(376002)(39860400002)(346002)(451199018)(36840700001)(40470700004)(46966006)(82740400003)(81166007)(82310400005)(36756003)(356005)(36860700001)(16526019)(40460700003)(40480700001)(6666004)(26005)(186003)(70586007)(1076003)(70206006)(4326008)(336012)(2616005)(478600001)(54906003)(316002)(2906002)(8676002)(6916009)(83380400001)(5660300002)(7406005)(8936002)(44832011)(86362001)(7416002)(41300700001)(426003)(47076005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2023 18:49:08.5186 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 31847463-33b7-4e3a-bf70-08db13732635 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000C966.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB5518 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Brijesh Singh The behavior and requirement for the SEV-legacy command is altered when the SNP firmware is in the INIT state. See SEV-SNP firmware specification for more details. Allocate the Trusted Memory Region (TMR) as a 2mb sized/aligned region when SNP is enabled to satisfy new requirements for the SNP. Continue allocating a 1mb region for !SNP configuration. While at it, provide API that can be used by others to allocate a page that can be used by the firmware. The immediate user for this API will be the KVM driver. The KVM driver to need to allocate a firmware context page during the guest creation. The context page need to be updated by the firmware. See the SEV-SNP specification for further details. Co-developed-by: Ashish Kalra Signed-off-by: Ashish Kalra Signed-off-by: Brijesh Singh Signed-off-by: Michael Roth --- drivers/crypto/ccp/sev-dev.c | 148 +++++++++++++++++++++++++++++++++-- include/linux/psp-sev.h | 9 +++ 2 files changed, 149 insertions(+), 8 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index eca4e59b0f44..4c12e98a1219 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -94,6 +94,13 @@ static void *sev_init_ex_buffer; */ struct sev_data_range_list *snp_range_list; +/* When SEV-SNP is enabled the TMR needs to be 2MB aligned and 2MB size. */ +#define SEV_SNP_ES_TMR_SIZE (2 * 1024 * 1024) + +static size_t sev_es_tmr_size = SEV_ES_TMR_SIZE; + +static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret); + static inline bool sev_version_greater_or_equal(u8 maj, u8 min) { struct sev_device *sev = psp_master->sev_data; @@ -216,11 +223,134 @@ void snp_mark_pages_offline(unsigned long pfn, unsigned int npages) } EXPORT_SYMBOL_GPL(snp_mark_pages_offline); +static int snp_reclaim_pages(unsigned long paddr, unsigned int npages, bool locked) +{ + /* Cbit maybe set in the paddr */ + unsigned long pfn = __sme_clr(paddr) >> PAGE_SHIFT; + int ret, err, i, n = 0; + + if (!pfn_valid(pfn)) { + pr_err("%s: Invalid PFN %lx\n", __func__, pfn); + return 0; + } + + for (i = 0; i < npages; i++, pfn++, n++) { + paddr = pfn << PAGE_SHIFT; + + if (locked) + ret = __sev_do_cmd_locked(SEV_CMD_SNP_PAGE_RECLAIM, &paddr, &err); + else + ret = sev_do_cmd(SEV_CMD_SNP_PAGE_RECLAIM, &paddr, &err); + + if (ret) + goto cleanup; + + ret = rmp_make_shared(pfn, PG_LEVEL_4K); + if (ret) + goto cleanup; + } + + return 0; + +cleanup: + /* + * If failed to reclaim the page then page is no longer safe to + * be release back to the system, leak it. + */ + snp_mark_pages_offline(pfn, npages - n); + return ret; +} + +static int rmp_mark_pages_firmware(unsigned long paddr, unsigned int npages, bool locked) +{ + /* Cbit maybe set in the paddr */ + unsigned long pfn = __sme_clr(paddr) >> PAGE_SHIFT; + int rc, n = 0, i; + + for (i = 0; i < npages; i++, n++, pfn++) { + rc = rmp_make_private(pfn, 0, PG_LEVEL_4K, 0, true); + if (rc) + goto cleanup; + } + + return 0; + +cleanup: + /* + * Try unrolling the firmware state changes by + * reclaiming the pages which were already changed to the + * firmware state. + */ + snp_reclaim_pages(paddr, n, locked); + + return rc; +} + +static struct page *__snp_alloc_firmware_pages(gfp_t gfp_mask, int order, bool locked) +{ + unsigned long npages = 1ul << order, paddr; + struct sev_device *sev; + struct page *page; + + if (!psp_master || !psp_master->sev_data) + return NULL; + + page = alloc_pages(gfp_mask, order); + if (!page) + return NULL; + + /* If SEV-SNP is initialized then add the page in RMP table. */ + sev = psp_master->sev_data; + if (!sev->snp_initialized) + return page; + + paddr = __pa((unsigned long)page_address(page)); + if (rmp_mark_pages_firmware(paddr, npages, locked)) + return NULL; + + return page; +} + +void *snp_alloc_firmware_page(gfp_t gfp_mask) +{ + struct page *page; + + page = __snp_alloc_firmware_pages(gfp_mask, 0, false); + + return page ? page_address(page) : NULL; +} +EXPORT_SYMBOL_GPL(snp_alloc_firmware_page); + +static void __snp_free_firmware_pages(struct page *page, int order, bool locked) +{ + struct sev_device *sev = psp_master->sev_data; + unsigned long paddr, npages = 1ul << order; + + if (!page) + return; + + paddr = __pa((unsigned long)page_address(page)); + if (sev->snp_initialized && + snp_reclaim_pages(paddr, npages, locked)) + return; + + __free_pages(page, order); +} + +void snp_free_firmware_page(void *addr) +{ + if (!addr) + return; + + __snp_free_firmware_pages(virt_to_page(addr), 0, false); +} +EXPORT_SYMBOL_GPL(snp_free_firmware_page); + static void *sev_fw_alloc(unsigned long len) { struct page *page; - page = alloc_pages(GFP_KERNEL, get_order(len)); + page = __snp_alloc_firmware_pages(GFP_KERNEL, get_order(len), false); if (!page) return NULL; @@ -468,7 +598,7 @@ static int __sev_init_locked(int *error) data.tmr_address = __pa(sev_es_tmr); data.flags |= SEV_INIT_FLAGS_SEV_ES; - data.tmr_len = SEV_ES_TMR_SIZE; + data.tmr_len = sev_es_tmr_size; } return __sev_do_cmd_locked(SEV_CMD_INIT, &data, error); @@ -491,7 +621,7 @@ static int __sev_init_ex_locked(int *error) data.tmr_address = __pa(sev_es_tmr); data.flags |= SEV_INIT_FLAGS_SEV_ES; - data.tmr_len = SEV_ES_TMR_SIZE; + data.tmr_len = sev_es_tmr_size; } return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error); @@ -982,6 +1112,8 @@ static int __sev_snp_init_locked(int *error) sev->snp_initialized = true; dev_dbg(sev->dev, "SEV-SNP firmware initialized\n"); + sev_es_tmr_size = SEV_SNP_ES_TMR_SIZE; + return rc; } @@ -1499,8 +1631,9 @@ static void sev_firmware_shutdown(struct sev_device *sev) /* The TMR area was encrypted, flush it from the cache */ wbinvd_on_all_cpus(); - free_pages((unsigned long)sev_es_tmr, - get_order(SEV_ES_TMR_SIZE)); + __snp_free_firmware_pages(virt_to_page(sev_es_tmr), + get_order(sev_es_tmr_size), + false); sev_es_tmr = NULL; } @@ -1511,8 +1644,7 @@ static void sev_firmware_shutdown(struct sev_device *sev) } if (snp_range_list) { - free_pages((unsigned long)snp_range_list, - get_order(PAGE_SIZE)); + snp_free_firmware_page(snp_range_list); snp_range_list = NULL; } @@ -1593,7 +1725,7 @@ void sev_pci_init(void) } /* Obtain the TMR memory area for SEV-ES use */ - sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE); + sev_es_tmr = sev_fw_alloc(sev_es_tmr_size); if (!sev_es_tmr) dev_warn(sev->dev, "SEV: TMR allocation failed, SEV-ES support unavailable\n"); diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 8edf5c548fbf..d19744807471 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -922,6 +922,8 @@ int sev_guest_decommission(struct sev_data_decommission *data, int *error); int sev_do_cmd(int cmd, void *data, int *psp_ret); void *psp_copy_user_blob(u64 uaddr, u32 len); +void *snp_alloc_firmware_page(gfp_t mask); +void snp_free_firmware_page(void *addr); /** * sev_mark_pages_offline - insert non-reclaimed firmware/guest pages @@ -959,6 +961,13 @@ static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_P void snp_mark_pages_offline(unsigned long pfn, unsigned int npages) {} +static inline void *snp_alloc_firmware_page(gfp_t mask) +{ + return NULL; +} + +static inline void snp_free_firmware_page(void *addr) { } + #endif /* CONFIG_CRYPTO_DEV_SP_PSP */ #endif /* __PSP_SEV_H__ */