[svsm-devel] Svsm-devel Digest, Vol 10, Issue 19

[Wang, Huibo]

[AMD Official Use Only - AMD Internal Distribution Only]

Hi Jon,

For SVSM APIC Protocol changes, there are 4 listed in the spec, SVSM_APIC_QUERY_FEATURES, SVSM_APIC_READ_REGISTER, SVSM_APIC_WRITE_REGISTER, SVSM_APIC_CONFIGURE_VECTOR. In the coconut svsm github, there is one more "const SVSM_REQ_APIC_CONFIGURE: u32 = 1", should this one also be included in the spec?

Thanks
Melody

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Subject: Svsm-devel Digest, Vol 10, Issue 19

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Today's Topics:

   1. RFC: Alternate Injection SVSM support (Jon Lange)


----------------------------------------------------------------------

Message: 1
Date: Fri, 17 May 2024 04:40:24 +0000
From: Jon Lange <jlange at microsoft.com>
To: "amd-sev-snp at lists.suse.com" <amd-sev-snp at lists.suse.com>,
        "svsm-devel at coconut-svsm.dev" <svsm-devel at coconut-svsm.dev>
Subject: [svsm-devel] RFC: Alternate Injection SVSM support
Message-ID:
        <DS7PR21MB352462BA31B209F93F296A17CAEE2 at DS7PR21MB3524.namprd21.prod.outlook.com>

Content-Type: text/plain; charset="us-ascii"

Attached is a specification I am proposing to handle support for Alternate Injection in SNP guests through the use of an SVSM.  This document proposes changes to the AMD GHCB specification and to the AMD SVSM specification to enable the negotiation required to make Alternate Injection work correctly.

Support for this protocol will not be possible in KVM until KVM is able to include native support for multiple VMPLs with separate interrupt sources for each.  That work is underway elsewhere, and my expectation is that this proposed specification will align with the capabilities that KVM will be introducing as part of the multi-VMPL support.

I will be submitting changes to COCONUT-SVSM to implement this protocol.  I welcome all feedback to the spec, and will update the code to match whatever spec changes are agreed upon.

-Jon



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