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Received: from BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) by DM4PR21MB3585.namprd21.prod.outlook.com (2603:10b6:8:a3::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6544.4; Tue, 20 Jun 2023 15:49:01 +0000 Received: from BL0PR2101MB1092.namprd21.prod.outlook.com ([fe80::e673:bfeb:d3c1:7682]) by BL0PR2101MB1092.namprd21.prod.outlook.com ([fe80::e673:bfeb:d3c1:7682%3]) with mapi id 15.20.6544.006; Tue, 20 Jun 2023 15:49:01 +0000 From: Dexuan Cui To: ak@linux.intel.com, arnd@arndb.de, bp@alien8.de, brijesh.singh@amd.com, dan.j.williams@intel.com, dave.hansen@intel.com, dave.hansen@linux.intel.com, haiyangz@microsoft.com, hpa@zytor.com, jane.chu@oracle.com, kirill.shutemov@linux.intel.com, kys@microsoft.com, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, luto@kernel.org, mingo@redhat.com, peterz@infradead.org, rostedt@goodmis.org, sathyanarayanan.kuppuswamy@linux.intel.com, seanjc@google.com, tglx@linutronix.de, tony.luck@intel.com, wei.liu@kernel.org, x86@kernel.org, mikelley@microsoft.com Cc: linux-kernel@vger.kernel.org, Tianyu.Lan@microsoft.com, rick.p.edgecombe@intel.com, Dexuan Cui Subject: [PATCH v8 1/2] x86/tdx: Retry TDVMCALL_MAP_GPA() when needed Date: Tue, 20 Jun 2023 08:48:29 -0700 Message-Id: <20230620154830.25442-2-decui@microsoft.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230620154830.25442-1-decui@microsoft.com> References: <20230620154830.25442-1-decui@microsoft.com> X-ClientProxiedBy: MW2PR16CA0023.namprd16.prod.outlook.com (2603:10b6:907::36) To BL0PR2101MB1092.namprd21.prod.outlook.com (2603:10b6:207:30::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR2101MB1092:EE_|DM4PR21MB3585:EE_ X-MS-Office365-Filtering-Correlation-Id: ae9a5705-9ac0-4220-e21d-08db71a5ddd7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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When a fully enlightened TDX guest runs on Hyper-V, Hyper-V can return the retry error when set_memory_decrypted() is called to decrypt up to 1GB of swiotlb bounce buffers. Acked-by: Kirill A. Shutemov Reviewed-by: Michael Kelley Signed-off-by: Dexuan Cui Reviewed-by: Kuppuswamy Sathyanarayanan --- arch/x86/coco/tdx/tdx.c | 63 +++++++++++++++++++++++++------ arch/x86/include/asm/shared/tdx.h | 2 + 2 files changed, 53 insertions(+), 12 deletions(-) Changes in v2: Used __tdx_hypercall() directly in tdx_map_gpa(). Added a max_retry_cnt of 1000. Renamed a few variables, e.g., r11 -> map_fail_paddr. Changes in v3: Changed max_retry_cnt from 1000 to 3. Changes in v4: __tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT) -> __tdx_hypercall_ret() Added Kirill's Acked-by. Changes in v5: Added Michael's Reviewed-by. Changes in v6: None. Changes in v7: Addressed Dave's comments: see https://lwn.net/ml/linux-kernel/SA1PR21MB1335736123C2BCBBFD7460C3BF46A@SA1PR21MB1335.namprd21.prod.outlook.com Changes in v8: Rebased to tip.git's master branch. diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c index 1d6b863c42b0..0c198ab73aa7 100644 --- a/arch/x86/coco/tdx/tdx.c +++ b/arch/x86/coco/tdx/tdx.c @@ -703,14 +703,16 @@ static bool tdx_cache_flush_required(void) } /* - * Inform the VMM of the guest's intent for this physical page: shared with - * the VMM or private to the guest. The VMM is expected to change its mapping - * of the page in response. + * Notify the VMM about page mapping conversion. More info about ABI + * can be found in TDX Guest-Host-Communication Interface (GHCI), + * section "TDG.VP.VMCALL". */ -static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc) +static bool tdx_map_gpa(phys_addr_t start, phys_addr_t end, bool enc) { - phys_addr_t start = __pa(vaddr); - phys_addr_t end = __pa(vaddr + numpages * PAGE_SIZE); + const int max_retries_per_page = 3; + struct tdx_hypercall_args args; + u64 map_fail_paddr, ret; + int retry_count = 0; if (!enc) { /* Set the shared (decrypted) bits: */ @@ -718,12 +720,49 @@ static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc) end |= cc_mkdec(0); } - /* - * Notify the VMM about page mapping conversion. More info about ABI - * can be found in TDX Guest-Host-Communication Interface (GHCI), - * section "TDG.VP.VMCALL" - */ - if (_tdx_hypercall(TDVMCALL_MAP_GPA, start, end - start, 0, 0)) + while (retry_count < max_retries_per_page) { + memset(&args, 0, sizeof(args)); + args.r10 = TDX_HYPERCALL_STANDARD; + args.r11 = TDVMCALL_MAP_GPA; + args.r12 = start; + args.r13 = end - start; + + ret = __tdx_hypercall_ret(&args); + if (ret != TDVMCALL_STATUS_RETRY) + return !ret; + /* + * The guest must retry the operation for the pages in the + * region starting at the GPA specified in R11. R11 comes + * from the untrusted VMM. Sanity check it. + */ + map_fail_paddr = args.r11; + if (map_fail_paddr < start || map_fail_paddr >= end) + return false; + + /* "Consume" a retry without forward progress */ + if (map_fail_paddr == start) { + retry_count++; + continue; + } + + start = map_fail_paddr; + retry_count = 0; + } + + return false; +} + +/* + * Inform the VMM of the guest's intent for this physical page: shared with + * the VMM or private to the guest. The VMM is expected to change its mapping + * of the page in response. + */ +static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc) +{ + phys_addr_t start = __pa(vaddr); + phys_addr_t end = __pa(vaddr + numpages * PAGE_SIZE); + + if (!tdx_map_gpa(start, end, enc)) return false; /* shared->private conversion requires memory to be accepted before use */ diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h index 90ea813c4b99..9db89a99ae5b 100644 --- a/arch/x86/include/asm/shared/tdx.h +++ b/arch/x86/include/asm/shared/tdx.h @@ -24,6 +24,8 @@ #define TDVMCALL_MAP_GPA 0x10001 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003 +#define TDVMCALL_STATUS_RETRY 1 + #ifndef __ASSEMBLY__ /*