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Mon, 19 Aug 2019 21:36:15 +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 21/28] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSCP NAE events Thread-Topic: [RFC PATCH 21/28] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSCP NAE events Thread-Index: AQHVVtYgXcTE+06HGEmvpTj7tV0dVw== Date: Mon, 19 Aug 2019 21:36:15 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SN2PR01CA0031.prod.exchangelabs.com (2603:10b6:804:2::41) To BYAPR12MB3158.namprd12.prod.outlook.com (2603:10b6:a03:132::19) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [165.204.77.1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e6e95d3f-a42f-4bcc-057e-08d724ed4323 x-ms-office365-filtering-ht: Tenant x-ms-traffictypediagnostic: BYAPR12MB3112: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:2000; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com Content-Language: en-US Content-ID: <381A20BD8EE28F45917888B578AD3C26@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=1566301157; bh=cyVrU7WqU4+3UiXg/269mcS/EatiPU7c0cGIFV2arU8=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=dCTCCpq022QbXmn2jLWkLd4v0l4XANtchjPVvadwblyHlKZfEjZGXBzFP0NWpDnj8p4 12wu8VSQDsFFNnL2UEu1BZwjMFGmBJq8uqkQKW+/vQcVbG7gFH6PO6ZOq2moYk/bJWwx0 sImDUdOsB3EAUSPQOdCuCZetVEaZhK3ZfYs= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Type: text/plain; charset="utf-8" From: Tom Lendacky Under SEV-ES, a RDTSCP intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Signed-off-by: Tom Lendacky --- .../X64/AMDSevVcCommon.c | 34 +++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c= b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c index 1a0a8f5cd718..8f9b742f942c 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -546,6 +546,36 @@ WbinvdExit ( return 0; } =20 +STATIC +UINTN +RdtscpExit ( + GHCB *Ghcb, + EFI_SYSTEM_CONTEXT_X64 *Regs, + SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINTN Status; + + DecodeModRm (Regs, InstructionData); + + Status =3D VmgExit (Ghcb, SvmExitRdtscp, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRcx) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + VmgExit (Ghcb, SvmExitUnsupported, SvmExitRdtscp, 0); + ASSERT (0); + } + Regs->Rax =3D Ghcb->SaveArea.Rax; + Regs->Rcx =3D Ghcb->SaveArea.Rcx; + Regs->Rdx =3D Ghcb->SaveArea.Rdx; + + return 0; +} + STATIC UINTN VmmCallExit ( @@ -1005,6 +1035,10 @@ DoVcCommon ( NaeExit =3D VmmCallExit; break; =20 + case SvmExitRdtscp: + NaeExit =3D RdtscpExit; + break; + case SvmExitWbinvd: NaeExit =3D WbinvdExit; break; --=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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