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From: "Lendacky, Thomas via groups.io" <thomas.lendacky=amd.com@groups.io>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: devel@edk2.groups.io, Ard Biesheuvel <ardb+tianocore@kernel.org>,
	Erdem Aktas <erdemaktas@google.com>,
	Jiewen Yao <jiewen.yao@intel.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Liming Gao <gaoliming@byosoft.com.cn>,
	Michael D Kinney <michael.d.kinney@intel.com>,
	Min Xu <min.m.xu@intel.com>,
	Zhiguang Liu <zhiguang.liu@intel.com>,
	Rahul Kumar <rahul1.kumar@intel.com>, Ray Ni <ray.ni@intel.com>,
	Michael Roth <michael.roth@amd.com>
Subject: Re: [edk2-devel] [PATCH 12/16] OvmfPkg/PlatformPei: Retrieve APIC IDs from the hypervisor
Date: Mon, 29 Jan 2024 11:49:16 -0600	[thread overview]
Message-ID: <22cbdfc3-b366-4591-8b71-8f3647d7f37f@amd.com> (raw)
In-Reply-To: <7c6nnvxz6icisjswsz2z3alymocylnovvxmn2ifg7svg5udqqn@yyxzah5skvff>

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=4654
>>
>> 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.
> 
>> +  ApicIds = AllocateReservedPages ((UINTN)PageCount);
> 
>> +  VmgExitStatus = CcExitVmgExit (Ghcb, SVM_EXIT_GET_APIC_IDS, (UINTN)ApicIds, 0);
> 
> Ah, you pass a pointer to GHCB_APIC_IDS instead of storing the data
> directly in the GHCB.  Scratch the patch #10 comment then.
> 
>> +  // 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) == GHCB_HV_FEATURES_APIC_ID_LIST) {
>> +    AmdSevSnpGetApicIds ();
>> +  }
> 
> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> 
> 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 
an SVSM, the SVSM requires this.

I could move this to the start of the series if you think that makes more 
sense.

Thanks,
Tom

> 
> take care,
>    Gerd
> 


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  reply	other threads:[~2024-01-29 17:49 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-26 22:12 [edk2-devel] [PATCH 00/16] Provide SEV-SNP support for running under an SVSM Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 01/16] OvmfPkg/BaseMemEncryptSevLib: Re-organize page state change support Lendacky, Thomas via groups.io
2024-01-29 12:59   ` Gerd Hoffmann
2024-01-29 15:39     ` Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 02/16] MdePkg/Register/Amd: Define the SVSM related information Lendacky, Thomas via groups.io
2024-01-29 13:12   ` Gerd Hoffmann
2024-01-26 22:13 ` [edk2-devel] [PATCH 03/16] MdePkg/BaseLib: Add a new VMGEXIT instruction invocation for SVSM Lendacky, Thomas via groups.io
2024-01-29 13:22   ` Gerd Hoffmann
2024-01-29 15:51     ` Lendacky, Thomas via groups.io
2024-01-30 11:51       ` Gerd Hoffmann
2024-01-31 18:30         ` Lendacky, Thomas via groups.io
2024-02-01  8:35           ` Gerd Hoffmann
2024-01-26 22:13 ` [edk2-devel] [PATCH 04/16] UefiCpuPkg/CcExitLib: Extend the CcExitLib library to support an SVSM Lendacky, Thomas via groups.io
2024-02-02  6:06   ` Ni, Ray
2024-01-26 22:13 ` [edk2-devel] [PATCH 05/16] Ovmfpkg/CcExitLib: Extend CcExitLib to handle SVSM related services Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 06/16] OvmfPkg: Create a calling area used to communicate with the SVSM Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 07/16] OvmfPkg/CcExitLib: Add support for the SVSM_CORE_PVALIDATE call Lendacky, Thomas via groups.io
2024-01-29 14:40   ` Gerd Hoffmann
2024-01-29 17:34     ` Lendacky, Thomas via groups.io
2024-01-31 18:40       ` Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 08/16] OvmfPkg/CcExitLib: Add support for the SVSM create/delete vCPU calls Lendacky, Thomas via groups.io
2024-01-29 14:46   ` Gerd Hoffmann
2024-01-29 17:37     ` Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 09/16] UefiCpuPkg/MpInitLib: Use CcExitSnpVmsaRmpAdjust() to set/clear VMSA Lendacky, Thomas via groups.io
2024-02-02  6:07   ` Ni, Ray
2024-01-26 22:13 ` [edk2-devel] [PATCH 10/16] MdePkg: GHCB APIC ID retrieval support definitions Lendacky, Thomas via groups.io
2024-01-29 14:52   ` Gerd Hoffmann
2024-01-26 22:13 ` [edk2-devel] [PATCH 11/16] UefiCpuPkg: Create APIC ID list PCD Lendacky, Thomas via groups.io
2024-01-29 14:57   ` Gerd Hoffmann
2024-02-02  6:08   ` Ni, Ray
2024-02-02 22:56     ` Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 12/16] OvmfPkg/PlatformPei: Retrieve APIC IDs from the hypervisor Lendacky, Thomas via groups.io
2024-01-29 15:00   ` Gerd Hoffmann
2024-01-29 17:49     ` Lendacky, Thomas via groups.io [this message]
2024-01-30 11:25       ` Gerd Hoffmann
2024-01-26 22:13 ` [edk2-devel] [PATCH 13/16] UefiCpuPkg/MpInitLib: Always use AP Create if PcdSevSnpApicIds is set Lendacky, Thomas via groups.io
2024-01-29 15:21   ` Gerd Hoffmann
2024-01-29 18:00     ` Lendacky, Thomas via groups.io
2024-02-02  6:20   ` Ni, Ray
2024-02-02 22:58     ` Lendacky, Thomas via groups.io
2024-02-05  5:06       ` Ni, Ray
2024-01-26 22:13 ` [edk2-devel] [PATCH 14/16] UefiCpuPkg/MpInitLib: AP creation support under an SVSM Lendacky, Thomas via groups.io
2024-01-29 15:21   ` Gerd Hoffmann
2024-02-02  6:48   ` Ni, Ray
2024-01-26 22:13 ` [edk2-devel] [PATCH 15/16] Ovmfpkg/CcExitLib: Provide SVSM discovery support Lendacky, Thomas via groups.io
2024-01-29 15:23   ` Gerd Hoffmann
2024-01-29 18:04     ` Lendacky, Thomas via groups.io
2024-01-30 11:38       ` Gerd Hoffmann
2024-01-30 16:13         ` Lendacky, Thomas via groups.io
2024-01-26 22:13 ` [edk2-devel] [PATCH 16/16] OvmfPkg/BaseMemEncryptLib: Check for presence of an SVSM when not at VMPL0 Lendacky, Thomas via groups.io
2024-01-29 15:24   ` Gerd Hoffmann
2024-01-27  4:04 ` [edk2-devel] [PATCH 00/16] Provide SEV-SNP support for running under an SVSM Yao, Jiewen
2024-01-27 17:48   ` Lendacky, Thomas via groups.io
2024-01-28  4:11     ` Yao, Jiewen
     [not found]     ` <17AE677D909D4A42.23935@groups.io>
2024-02-09  8:11       ` Yao, Jiewen
2024-02-09 16:17         ` Lendacky, Thomas via groups.io

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