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Thu, 19 Sep 2019 19:52:50 +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 , "Singh, Brijesh" Subject: [edk2-devel] [RFC PATCH v2 23/44] UefiCpuPkg/CpuExceptionHandler: Add support for MSR_PROT NAE events Thread-Topic: [RFC PATCH v2 23/44] UefiCpuPkg/CpuExceptionHandler: Add support for MSR_PROT NAE events Thread-Index: AQHVbyPRGRB3SH6iw0G/RYA62qqL5w== Date: Thu, 19 Sep 2019 19:52:50 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SN4PR0501CA0146.namprd05.prod.outlook.com (2603:10b6:803:2c::24) To DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:182::22) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [165.204.78.1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 3c416291-91f6-4290-04b0-08d73d3af3e6 x-ms-office365-filtering-ht: Tenant x-ms-traffictypediagnostic: DM6PR12MB3228: x-ms-exchange-purlcount: 1 x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6790; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: 4josDsC69elWvb1O7juunMQIx1787277AA= Content-Language: en-US Content-ID: <03A5C9DB0B9AE74F8046100CE67A4647@namprd12.prod.outlook.com> Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1568922772; bh=pgcZfxMzKtr7hDLR9CbgAZ1rg6euQa76XASHM5sHKaA=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=dBOSdwdA3IA/Z9f9hJHFUmBpk/OgCN4QOQllAC78czmY9Fvia2BcgSuBqTa2QbPsOeZ 6l65fdv/fzGfpbNZKNr1L8MsNdW+p5On2PSUGHnTFF5AstwNC5N8scemh9Eks2JS4FevW AskzUIZI4PYfqCPE6/MKhsHWAwj2qpaBiJI= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Type: text/plain; charset="utf-8" From: Tom Lendacky BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D2198 Under SEV-ES, a MSR_PROT intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Add support to construct the required GHCB values to support an MSR_PROT NAE event. Parse the instruction that generated the #VC exception to determine whether it is RDMSR or WRMSR, setting the required register register values in the GHCB and creating the proper SW_EXIT_INFO1 value in the GHCB. Cc: Eric Dong Cc: Ray Ni Cc: Laszlo Ersek Signed-off-by: Tom Lendacky --- .../X64/AMDSevVcCommon.c | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c= b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c index 29119ba863d3..748883419752 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -278,6 +278,54 @@ UnsupportedExit ( return Status; } =20 +STATIC +UINTN +MsrExit ( + GHCB *Ghcb, + EFI_SYSTEM_CONTEXT_X64 *Regs, + SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINT64 ExitInfo1; + UINTN Status; + + ExitInfo1 =3D 0; + + switch (*(InstructionData->OpCodes + 1)) { + case 0x30: // WRMSR + ExitInfo1 =3D 1; + Ghcb->SaveArea.Rax =3D Regs->Rax; + GhcbSetRegValid (Ghcb, GhcbRax); + Ghcb->SaveArea.Rdx =3D Regs->Rdx; + GhcbSetRegValid (Ghcb, GhcbRdx); + /* Fallthrough */ + case 0x32: // RDMSR + Ghcb->SaveArea.Rcx =3D Regs->Rcx; + GhcbSetRegValid (Ghcb, GhcbRcx); + break; + default: + VmgExit (Ghcb, SvmExitUnsupported, SvmExitMsr, 0); + ASSERT (0); + } + + Status =3D VmgExit (Ghcb, SvmExitMsr, ExitInfo1, 0); + if (Status) { + return Status; + } + + if (!ExitInfo1) { + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + VmgExit (Ghcb, SvmExitUnsupported, SvmExitMsr, 0); + ASSERT (0); + } + Regs->Rax =3D Ghcb->SaveArea.Rax; + Regs->Rdx =3D Ghcb->SaveArea.Rdx; + } + + return 0; +} + #define IOIO_TYPE_STR (1 << 2) #define IOIO_TYPE_IN 1 #define IOIO_TYPE_INS (IOIO_TYPE_IN | IOIO_TYPE_STR) @@ -546,6 +594,10 @@ DoVcCommon ( NaeExit =3D IoioExit; break; =20 + case SvmExitMsr: + NaeExit =3D MsrExit; + break; + default: NaeExit =3D UnsupportedExit; } --=20 2.17.1 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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