[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <15731bec-d137-4671-a580-c662fbef9c47@oracle.com>
Date: Fri, 21 Jun 2024 16:45:01 +0000
From: Liam Merwick <liam.merwick@...cle.com>
To: Michael Roth <michael.roth@....com>,
"kvm@...r.kernel.org"
<kvm@...r.kernel.org>
CC: "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"x86@...nel.org" <x86@...nel.org>,
"pbonzini@...hat.com"
<pbonzini@...hat.com>,
"seanjc@...gle.com" <seanjc@...gle.com>,
"jroedel@...e.de" <jroedel@...e.de>,
"thomas.lendacky@....com"
<thomas.lendacky@....com>,
"pgonda@...gle.com" <pgonda@...gle.com>,
"ashish.kalra@....com" <ashish.kalra@....com>,
"bp@...en8.de" <bp@...en8.de>,
"pankaj.gupta@....com" <pankaj.gupta@....com>,
Liam Merwick
<liam.merwick@...cle.com>
Subject: Re: [PATCH v1 3/5] KVM: SEV: Provide support for
SNP_EXTENDED_GUEST_REQUEST NAE event
On 21/06/2024 14:40, Michael Roth wrote:
> Version 2 of GHCB specification added support for the SNP Extended Guest
> Request Message NAE event. This event serves a nearly identical purpose
> to the previously-added SNP_GUEST_REQUEST event, but for certain message
> types it allows the guest to supply a buffer to be used for additional
> information in some cases.
>
> Currently the GHCB spec only defines extended handling of this sort in
> the case of attestation requests, where the additional buffer is used to
> supply a table of certificate data corresponding to the attestion
typo: attestion
> report's signing key. Support for this extended handling will require
> additional KVM APIs to handle coordinating with userspace.
>
> Whether or not the hypervisor opts to provide this certificate data is
> optional. However, support for processing SNP_EXTENDED_GUEST_REQUEST
> GHCB requests is required by the GHCB 2.0 specification for SNP guests,
> so for now implement a stub implementation that provides an empty
> certificate table to the guest if it supplies an additional buffer, but
> otherwise behaves identically to SNP_GUEST_REQUEST.
>
> Signed-off-by: Michael Roth <michael.roth@....com>
Reviewed-by: Liam Merwick <liam.merwick@...cle.com>
> ---
> arch/x86/kvm/svm/sev.c | 60 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 60 insertions(+)
Powered by blists - more mailing lists