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Wed, 22 Apr 2020 17:42:41 +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] [PATCH v7 24/43] UefiCpuPkg/CpuExceptionHandler: Add support for MWAIT/MWAITX NAE events Date: Wed, 22 Apr 2020 12:41:39 -0500 Message-Id: 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) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-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; Wed, 22 Apr 2020 17:42:40 +0000 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: bbf3dc3b-2b32-4712-c188-08d7e6e48e24 X-MS-TrafficTypeDiagnostic: DM6PR12MB3449:|DM6PR12MB3449: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6430; 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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: 5N4darSBXUX47zrzDWoaUqR5x1787277AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1587577364; bh=+k1fonmWfrH4LiMp/M2Zc3H/Q14eSs8+3KcvA8POfqQ=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=S8vRfiEk5t+v+LD9aV0spg0ynBlaIsTPDKjP2p4lSKqfM/st1zrNwtDmMSML56JLOB2 ICwCvJ57B1z56ru7Dm6x/sQ/QEluhvsEu81C+ZYZxOxlni8RvFBqoCrtqdrQJLXDE5WMh Z1Pd7cuiferJBCWn2/AWa+OTShbVgQkS8vE= 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 MWAIT/MWAITX 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/ArchAMDSevVcHandler.c | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHand= ler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c index 890451ff97a2..023e7dc31202 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c @@ -836,6 +836,45 @@ MmioExit ( return Status; } =20 +/** + Handle a MWAIT event. + + Use the VMGEXIT instruction to handle a MWAIT event. + + @param[in, out] Ghcb Pointer to the Guest-Hypervisor Communi= cation + Block + @param[in, out] Regs x64 processor context + @param[in] InstructionData Instruction parsing context + + @retval 0 Event handled successfully + @retval Others New exception value to propagate + +**/ +STATIC +UINT64 +MwaitExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINT64 Status; + + DecodeModRm (Regs, InstructionData); + + Ghcb->SaveArea.Rax =3D Regs->Rax; + GhcbSetRegValid (Ghcb, GhcbRax); + Ghcb->SaveArea.Rcx =3D Regs->Rcx; + GhcbSetRegValid (Ghcb, GhcbRcx); + + Status =3D VmgExit (Ghcb, SvmExitMwait, 0, 0); + if (Status) { + return Status; + } + + return 0; +} + /** Handle a MONITOR event. =20 @@ -1518,6 +1557,10 @@ DoVcCommon ( NaeExit =3D MonitorExit; break; =20 + case SvmExitMwait: + NaeExit =3D MwaitExit; + break; + case SvmExitNpf: NaeExit =3D MmioExit; 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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