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Received: from DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:15e::26) by DM6PR12MB3449.namprd12.prod.outlook.com (2603:10b6:5:3b::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2921.25; Wed, 22 Apr 2020 17:42:28 +0000 Received: from DM6PR12MB3163.namprd12.prod.outlook.com ([fe80::9ae:cb95:c925:d5bf]) by DM6PR12MB3163.namprd12.prod.outlook.com ([fe80::9ae:cb95:c925:d5bf%4]) with mapi id 15.20.2921.030; Wed, 22 Apr 2020 17:42:28 +0000 From: "Lendacky, Thomas" To: devel@edk2.groups.io Cc: Jordan Justen , Laszlo Ersek , Ard Biesheuvel , Michael D Kinney , Liming Gao , Eric Dong , Ray Ni , Brijesh Singh Subject: [PATCH v7 13/43] UefiCpuPkg/CpuExceptionHandler: Support string IO for IOIO_PROT NAE events Date: Wed, 22 Apr 2020 12:41:28 -0500 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-ClientProxiedBy: DM5PR04CA0060.namprd04.prod.outlook.com (2603:10b6:3:ef::22) To DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:15e::26) Return-Path: thomas.lendacky@amd.com MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from tlendack-t1.amd.com (165.204.77.1) by DM5PR04CA0060.namprd04.prod.outlook.com (2603:10b6:3:ef::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2937.13 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: I28QwOrs/T83pXQAR8q0EFf3zjmz6LNdcNyaDQ+HEuuCUmW2V8jLxyUqLXaJI8bu32QaaPxRNPIyEhFq0HvdG7yjtJZpfaLrBRgnSO+kCmovNJRINEd+E+LvigDg97sjkvJC2AxfrtCeXqztbsqhfhR5ZHXdJlIJTc/I+nT3Rq1y8QGX0W9jBgSSvqFKuCUcG/4+fjwM/X5O/WECt4MC/kN9sGPxF9iHASUAZqbWBGRg5kuP1rjGb3oYPt8weVrYxQ/V2yuRWdgnpOft6QFxHbo36oEN9JkJ4icuB/jTiPTsKoP4wCOnHnHzbLma8Ymr6PXhN3dFSIpYmOpwUijV6q8U4JZH21Wmimku/Mo8s8XDGo8Me4rLgYYK5Y99KoFeuyFsLhdtqDWLM+Ixx9rpjaxnYl8CfvCKfQSTmyRsGRfpiRmfFf7c9v0nXuTjloWc+YPcCg9Znuh0zXx7wnxpf4BQM0bsJjM8W/2hbaNkEa8RjvEaZOxJJiwcY+VmByHgMcT1bX7sepPbeJ1Hio20gqi94uxvKiGOKZnfe6fVCw2VlssaScoTqFBJJ6Jt9puG5XF0iryQa3iG8AWQ6O9F2w== X-MS-Exchange-AntiSpam-MessageData: dyVZhk0Gg831CZ8GU7qwGu2WaDK20qbo+/J4Lki6jksX37ylOuqvblU4CcyHFp9/kiKzyOFYZSbpzwLf7wfjpMqdA+QTFFxeqXS8WtU7FZ20OUUgbPMSfofGHwTv1IgHDCETTiWS3JSVkFr9P1GnLQ== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: b5656247-39b0-4277-c084-08d7e6e486e2 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Apr 2020 17:42:28.7733 (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: gkfAPNJflwRRbNzpyrIUiiT9kTj9FnThJpFOpp7OeZoODkXmnlhzDUOllKtbYiGMKG+4pKQdnTLweDwlzNASpQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3449 Content-Type: text/plain BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 Add support to the #VC exception handler to handle string IO. This requires expanding the IO instruction parsing to recognize string based IO instructions as well as preparing an un-encrypted buffer to be used to transfer (either to or from the guest) the string contents for the IO operation. The SW_EXITINFO2 and SW_SCRATCH fields of the GHCB are set appropriately for the operation. Multiple VMGEXIT invocations may be needed to complete the string IO operation. Cc: Eric Dong Cc: Ray Ni Cc: Laszlo Ersek Signed-off-by: Tom Lendacky --- .../X64/ArchAMDSevVcHandler.c | 86 ++++++++++++++++--- 1 file changed, 72 insertions(+), 14 deletions(-) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c index 588f2af572e1..5fade675ad84 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c @@ -446,6 +446,22 @@ IoioExitInfo ( ExitInfo = 0; switch (*(InstructionData->OpCodes)) { + // INS opcodes + case 0x6C: + case 0x6D: + ExitInfo |= IOIO_TYPE_INS; + ExitInfo |= IOIO_SEG_ES; + ExitInfo |= ((Regs->Rdx & 0xffff) << 16); + break; + + // OUTS opcodes + case 0x6E: + case 0x6F: + ExitInfo |= IOIO_TYPE_OUTS; + ExitInfo |= IOIO_SEG_DS; + ExitInfo |= ((Regs->Rdx & 0xffff) << 16); + break; + // IN immediate opcodes case 0xE4: case 0xE5: @@ -483,6 +499,8 @@ IoioExitInfo ( } switch (*(InstructionData->OpCodes)) { + case 0x6C: + case 0x6E: case 0xE4: case 0xE6: case 0xEC: @@ -543,30 +561,70 @@ IoioExit ( IN SEV_ES_INSTRUCTION_DATA *InstructionData ) { - UINT64 ExitInfo1, Status; + UINT64 ExitInfo1, ExitInfo2, Status; + BOOLEAN String; ExitInfo1 = IoioExitInfo (Regs, InstructionData); if (!ExitInfo1) { return UnsupportedExit (Ghcb, Regs, InstructionData); } - if (ExitInfo1 & IOIO_TYPE_IN) { - Ghcb->SaveArea.Rax = 0; + String = (ExitInfo1 & IOIO_TYPE_STR) ? TRUE : FALSE; + if (String) { + UINTN IoBytes, VmgExitBytes; + UINTN GhcbCount, OpCount; + + Status = 0; + + IoBytes = (ExitInfo1 >> 4) & 0x7; + GhcbCount = sizeof (Ghcb->SharedBuffer) / IoBytes; + + OpCount = (ExitInfo1 & IOIO_REP) ? Regs->Rcx : 1; + while (OpCount) { + ExitInfo2 = MIN (OpCount, GhcbCount); + VmgExitBytes = ExitInfo2 * IoBytes; + + if (!(ExitInfo1 & IOIO_TYPE_IN)) { + CopyMem (Ghcb->SharedBuffer, (VOID *) Regs->Rsi, VmgExitBytes); + Regs->Rsi += VmgExitBytes; + } + + Ghcb->SaveArea.SwScratch = (UINT64) Ghcb->SharedBuffer; + Status = VmgExit (Ghcb, SvmExitIoioProt, ExitInfo1, ExitInfo2); + if (Status) { + return Status; + } + + if (ExitInfo1 & IOIO_TYPE_IN) { + CopyMem ((VOID *) Regs->Rdi, Ghcb->SharedBuffer, VmgExitBytes); + Regs->Rdi += VmgExitBytes; + } + + if (ExitInfo1 & IOIO_REP) { + Regs->Rcx -= ExitInfo2; + } + + OpCount -= ExitInfo2; + } } else { - CopyMem (&Ghcb->SaveArea.Rax, &Regs->Rax, IOIO_DATA_BYTES (ExitInfo1)); - } - GhcbSetRegValid (Ghcb, GhcbRax); + if (ExitInfo1 & IOIO_TYPE_IN) { + Ghcb->SaveArea.Rax = 0; + } else { + CopyMem (&Ghcb->SaveArea.Rax, &Regs->Rax, IOIO_DATA_BYTES (ExitInfo1)); + } + GhcbSetRegValid (Ghcb, GhcbRax); - Status = VmgExit (Ghcb, SvmExitIoioProt, ExitInfo1, 0); - if (Status) { - return Status; - } + Status = VmgExit (Ghcb, SvmExitIoioProt, ExitInfo1, 0); + if (Status) { + return Status; + } - if (ExitInfo1 & IOIO_TYPE_IN) { - if (!GhcbIsRegValid (Ghcb, GhcbRax)) { - return UnsupportedExit (Ghcb, Regs, InstructionData); + if (ExitInfo1 & IOIO_TYPE_IN) { + if (!GhcbIsRegValid (Ghcb, GhcbRax)) { + return UnsupportedExit (Ghcb, Regs, InstructionData); + } + CopyMem (&Regs->Rax, &Ghcb->SaveArea.Rax, IOIO_DATA_BYTES (ExitInfo1)); } - CopyMem (&Regs->Rax, &Ghcb->SaveArea.Rax, IOIO_DATA_BYTES (ExitInfo1)); } return 0; -- 2.17.1