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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, Brijesh Singh Subject: [PATCH Part2 v5 14/45] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Date: Fri, 20 Aug 2021 10:58:47 -0500 Message-Id: <20210820155918.7518-15-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210820155918.7518-1-brijesh.singh@amd.com> References: <20210820155918.7518-1-brijesh.singh@amd.com> X-ClientProxiedBy: SN7P222CA0013.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::11) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SN7P222CA0013.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:124::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.18 via Frontend Transport; Fri, 20 Aug 2021 16:00:10 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 65c05a95-cc38-442d-7488-08d963f39740 X-MS-TrafficTypeDiagnostic: SA0PR12MB4574: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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dkim=pass header.d=amd.com header.s=selector1 header.b=gGRn7NpK; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf23.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.220.70 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-Stat-Signature: f6uziz9t11yijea739gxorwr3uxkfcdn X-Rspamd-Queue-Id: 27CD290000AF X-Rspamd-Server: rspam01 X-HE-Tag: 1629475215-368912 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 satify 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. Signed-off-by: Brijesh Singh --- drivers/crypto/ccp/sev-dev.c | 169 ++++++++++++++++++++++++++++++++++- include/linux/psp-sev.h | 11 +++ 2 files changed, 176 insertions(+), 4 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 01edad9116f2..34dc358b13b9 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -62,6 +62,14 @@ static int psp_timeout; #define SEV_ES_TMR_SIZE (1024 * 1024) static void *sev_es_tmr; +/* 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 int sev_do_cmd(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; @@ -159,6 +167,156 @@ static int sev_cmd_buffer_len(int cmd) return 0; } +static void snp_leak_pages(unsigned long pfn, unsigned int npages) +{ + WARN(1, "psc failed, pfn 0x%lx pages %d (leaking)\n", pfn, npages); + while (npages--) { + memory_failure(pfn, 0); + dump_rmpentry(pfn); + pfn++; + } +} + +static int snp_reclaim_pages(unsigned long pfn, unsigned int npages, bool locked) +{ + struct sev_data_snp_page_reclaim data; + int ret, err, i, n = 0; + + for (i = 0; i < npages; i++) { + memset(&data, 0, sizeof(data)); + data.paddr = pfn << PAGE_SHIFT; + + if (locked) + ret = __sev_do_cmd_locked(SEV_CMD_SNP_PAGE_RECLAIM, &data, &err); + else + ret = sev_do_cmd(SEV_CMD_SNP_PAGE_RECLAIM, &data, &err); + if (ret) + goto cleanup; + + ret = rmp_make_shared(pfn, PG_LEVEL_4K); + if (ret) + goto cleanup; + + pfn++; + n++; + } + + return 0; + +cleanup: + /* + * If failed to reclaim the page then page is no longer safe to + * be released, leak it. + */ + snp_leak_pages(pfn, npages - n); + return ret; +} + +static inline int rmp_make_firmware(unsigned long pfn, int level) +{ + return rmp_make_private(pfn, 0, level, 0, true); +} + +static int snp_set_rmp_state(unsigned long paddr, unsigned int npages, bool to_fw, bool locked, + bool need_reclaim) +{ + unsigned long pfn = __sme_clr(paddr) >> PAGE_SHIFT; /* Cbit maybe set in the paddr */ + int rc, n = 0, i; + + for (i = 0; i < npages; i++) { + if (to_fw) + rc = rmp_make_firmware(pfn, PG_LEVEL_4K); + else + rc = need_reclaim ? snp_reclaim_pages(pfn, 1, locked) : + rmp_make_shared(pfn, PG_LEVEL_4K); + if (rc) + goto cleanup; + + pfn++; + n++; + } + + return 0; + +cleanup: + /* Try unrolling the firmware state changes */ + if (to_fw) { + /* + * Reclaim the pages which were already changed to the + * firmware state. + */ + snp_reclaim_pages(paddr >> PAGE_SHIFT, n, locked); + + return rc; + } + + /* + * If failed to change the page state to shared, then its not safe + * to release the page back to the system, leak it. + */ + snp_leak_pages(pfn, npages - n); + + 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 ERR_PTR(-EINVAL); + + 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_inited) + return page; + + paddr = __pa((unsigned long)page_address(page)); + if (snp_set_rmp_state(paddr, npages, true, locked, false)) + 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) +{ + unsigned long paddr, npages = 1ul << order; + + if (!page) + return; + + paddr = __pa((unsigned long)page_address(page)); + if (snp_set_rmp_state(paddr, npages, false, locked, true)) + 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(snp_free_firmware_page); + static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret) { struct psp_device *psp = psp_master; @@ -281,7 +439,7 @@ static int __sev_platform_init_locked(int *error) data.flags |= SEV_INIT_FLAGS_SEV_ES; data.tmr_address = tmr_pa; - data.tmr_len = SEV_ES_TMR_SIZE; + data.tmr_len = sev_es_tmr_size; } rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, error); @@ -638,6 +796,8 @@ static int __sev_snp_init_locked(int *error) sev->snp_inited = true; dev_dbg(sev->dev, "SEV-SNP firmware initialized\n"); + sev_es_tmr_size = SEV_SNP_ES_TMR_SIZE; + return rc; } @@ -1161,8 +1321,9 @@ 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; } @@ -1233,7 +1394,7 @@ void sev_pci_init(void) } /* Obtain the TMR memory area for SEV-ES use */ - tmr_page = alloc_pages(GFP_KERNEL, get_order(SEV_ES_TMR_SIZE)); + tmr_page = __snp_alloc_firmware_pages(GFP_KERNEL, get_order(sev_es_tmr_size), false); if (tmr_page) { sev_es_tmr = page_address(tmr_page); } else { diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index f2105a8755f9..00bd684dc094 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -12,6 +12,8 @@ #ifndef __PSP_SEV_H__ #define __PSP_SEV_H__ +#include + #include #ifdef CONFIG_X86 @@ -919,6 +921,8 @@ int snp_guest_page_reclaim(struct sev_data_snp_page_reclaim *data, int *error); int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *error); void *psp_copy_user_blob(u64 uaddr, u32 len); +void *snp_alloc_firmware_page(gfp_t mask); +void snp_free_firmware_page(void *addr); #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ @@ -960,6 +964,13 @@ static inline int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *erro return -ENODEV; } +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__ */