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Wed, 20 Nov 2019 20:07:32 +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: [edk2-devel] [RFC PATCH v3 15/43] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSC NAE events Date: Wed, 20 Nov 2019 14:06:37 -0600 Message-Id: <72cf6a085102da28f1e73fc444b5db2c52c41e9a.1574280425.git.thomas.lendacky@amd.com> In-Reply-To: References: X-ClientProxiedBy: DM3PR12CA0087.namprd12.prod.outlook.com (2603:10b6:0:57::31) To DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:15e::26) MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: d224080c-3e15-4b6f-9d78-08d76df546a3 X-MS-TrafficTypeDiagnostic: DM6PR12MB3675: X-MS-Exchange-PUrlCount: 1 X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2000; Received-SPF: pass (zoho.com: domain of groups.io designates 66.175.222.12 as permitted sender) client-ip=66.175.222.12; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: RbdgNGjjJcy2xJD8dbR2IJiIx1787277AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1574280453; bh=5lJ/1vNi8YUyPiC8gDJbSR9uDeVdrbUCnnbe9tm3pRk=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=EBccB+1WVIkHEO+crqo6/AromW237jgqvRmpKiVTS1fNtlOlaxIcL1VwUDuf3DxtVic 7phdd7yfraWfImkLJ0Skn4d/D+7fl8868/E2WB4RWqgiCMpj6LuRMuYo7wd6dilRKUt4U K7VqlGsYQ2WJ1S5kP2prXoNIa+VlS7nP/Ic= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 697d50338da0..1b08a855cda0 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -895,6 +895,32 @@ 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, @@ -911,6 +937,10 @@ 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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