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Thu, 19 Sep 2019 19:52:54 +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 26/44] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSC NAE events Thread-Topic: [RFC PATCH v2 26/44] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSC NAE events Thread-Index: AQHVbyPTGlN05ZqztkidfTKhfjD/EQ== Date: Thu, 19 Sep 2019 19:52:53 +0000 Message-ID: <58a9030898bd50bd2d5268a26ccd0d3963e1a3b2.1568922729.git.thomas.lendacky@amd.com> 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: 68bee565-b3f1-46e1-c084-08d73d3af5c9 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:2000; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: JSVFHhPnnrJQMzklzOKbujcQx1787277AA= Content-Language: en-US Content-ID: <906AD48AC58E9B42867A216AB1681FBF@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=1568922775; bh=Pm0ktJLXJwNjN/anVMeaympj56+YqLq0bSoG6oT/xBo=; h=CC:Content-Type:Date:From:Reply-To:Subject:To; b=rBsnLvwbvVn47MdGsy4uUzR9vGj1cC7TVwDoBbX+qZz0ScPbanDlzFnEMG//d/ETTdB t6ueWR9Q0AoN7yKeWNsF+uw6bWv+jtiR5rcOZy2qZm+rB3ZqxtZsDXqjNSbPC+h9D83kI ZTttqrhmqD/IJsmTgkPA7LzxNLFD6IPvD2A= 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 RDTSC intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Cc: Eric Dong Cc: Ray Ni Cc: Laszlo Ersek Signed-off-by: Tom Lendacky --- .../X64/AMDSevVcCommon.c | 30 +++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c= b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c index f8966cc3eca0..1f6a1f9a30ce 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -865,6 +865,32 @@ CpuidExit ( return 0; } =20 +STATIC +UINTN +RdtscExit ( + GHCB *Ghcb, + EFI_SYSTEM_CONTEXT_X64 *Regs, + SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINTN Status; + + Status =3D VmgExit (Ghcb, SvmExitRdtsc, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + VmgExit (Ghcb, SvmExitUnsupported, SvmExitRdtsc, 0); + ASSERT (0); + } + Regs->Rax =3D Ghcb->SaveArea.Rax; + Regs->Rdx =3D Ghcb->SaveArea.Rdx; + + return 0; +} + UINTN DoVcCommon ( GHCB *Ghcb, @@ -881,6 +907,10 @@ DoVcCommon ( =20 ExitCode =3D Regs->ExceptionData; switch (ExitCode) { + case SvmExitRdtsc: + NaeExit =3D RdtscExit; + break; + case SvmExitCpuid: NaeExit =3D CpuidExit; 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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