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Jan 2024 17:49:18 +0000 Message-ID: <22cbdfc3-b366-4591-8b71-8f3647d7f37f@amd.com> Date: Mon, 29 Jan 2024 11:49:16 -0600 User-Agent: Mozilla Thunderbird Subject: Re: [edk2-devel] [PATCH 12/16] OvmfPkg/PlatformPei: Retrieve APIC IDs from the hypervisor To: Gerd Hoffmann Cc: devel@edk2.groups.io, Ard Biesheuvel , Erdem Aktas , Jiewen Yao , Laszlo Ersek , Liming Gao , Michael D Kinney , Min Xu , Zhiguang Liu , Rahul Kumar , Ray Ni , Michael Roth References: <7c6nnvxz6icisjswsz2z3alymocylnovvxmn2ifg7svg5udqqn@yyxzah5skvff> From: "Lendacky, Thomas via groups.io" Autocrypt: addr=thomas.lendacky@amd.com; keydata= xsFNBFaNZYkBEADxg5OW/ajpUG7zgnUQPsMqWPjeAxtu4YH3lCUjWWcbUgc2qDGAijsLTFv1 kEbaJdblwYs28z3chM7QkfCGMSM29JWR1fSwPH18WyAA84YtxfPD8bfb1Exwo0CRw1RLRScn 6aJhsZJFLKyVeaPO1eequEsFQurRhLyAfgaH9iazmOVZZmxsGiNRJkQv4YnM2rZYi+4vWnxN 1ebHf4S1puN0xzQsULhG3rUyV2uIsqBFtlxZ8/r9MwOJ2mvyTXHzHdJBViOalZAUo7VFt3Fb aNkR5OR65eTL0ViQiRgFfPDBgkFCSlaxZvc7qSOcrhol160bK87qn0SbYLfplwiXZY/b/+ez 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mPvugL49+ew+K7h4HPSm47lIjAbDtRKohmQ9n5ZeCI1fIeJJSC05NLio5Tfd+JF6MgGQfl0shY4j9fMWkvgqJQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7733 Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: IcFHmilvT5AEtcFYq3rmo4lNx7686176AA= Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=KXFPwCG8; spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io; dmarc=none; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") On 1/29/24 09:00, Gerd Hoffmann wrote: > On Fri, Jan 26, 2024 at 04:13:11PM -0600, Tom Lendacky wrote: >> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D4654 >> >> If the hypervisor supports retrieval of the vCPU APIC IDs, retrieve >> them before any APs are actually started. The APIC IDs can be used >> to start the APs for any SEV-SNP guest, but is a requirement for an >> SEV-SNP guest that is running under an SVSM. >=20 >> + ApicIds =3D AllocateReservedPages ((UINTN)PageCount); >=20 >> + VmgExitStatus =3D CcExitVmgExit (Ghcb, SVM_EXIT_GET_APIC_IDS, (UINTN)= ApicIds, 0); >=20 > Ah, you pass a pointer to GHCB_APIC_IDS instead of storing the data > directly in the GHCB. Scratch the patch #10 comment then. >=20 >> + // Retrieve the APIC IDs if the hypervisor supports it. These will be= used >> + // to always start APs using SNP AP Create. >> + // >> + if ((HvFeatures & GHCB_HV_FEATURES_APIC_ID_LIST) =3D=3D GHCB_HV_FEATU= RES_APIC_ID_LIST) { >> + AmdSevSnpGetApicIds (); >> + } >=20 > Acked-by: Gerd Hoffmann >=20 > This looks like it does not depend on the SVSM being present, > is this correct? Correct, this doesn't require the SVSM to be used. But when running under= =20 an SVSM, the SVSM requires this. I could move this to the start of the series if you think that makes more= =20 sense. Thanks, Tom >=20 > take care, > Gerd >=20 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#114722): https://edk2.groups.io/g/devel/message/114722 Mute This Topic: https://groups.io/mt/103986465/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io] -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-