From: "Gerd Hoffmann" <kraxel@redhat.com>
To: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Dov Murik <dovmurik@linux.ibm.com>,
James Bottomley <jejb@linux.ibm.com>,
devel@edk2.groups.io, Brijesh Singh <brijesh.singh@amd.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
Jordan Justen <jordan.l.justen@intel.com>,
Erdem Aktas <erdemaktas@google.com>,
Jiewen Yao <jiewen.yao@intel.com>, Min Xu <min.m.xu@intel.com>
Subject: Re: [PATCH 1/2] OvmfPkg/OvmfPkgX64: Add SEV launch secret and hashes table areas to MEMFD
Date: Wed, 3 Nov 2021 07:07:11 +0100 [thread overview]
Message-ID: <20211103060711.uaalevtxebwfnvgg@sirius.home.kraxel.org> (raw)
In-Reply-To: <5f3cbabe-9a50-662a-16d9-09a1d04a3542@amd.com>
Hi,
> > > Does SEV need and/or use SMM mode? Looking through AmdSevX64.dsc
> > > doesn't give a clear answer, on one hand there is a
> > > LibraryClasses.common.SMM_CORE section, but on the other hand it uses
> > > the non-SMM variable driver stack.
> >
> > I think SEV doesn't work with SMM. James - can you please give a more
> > definitive answer here?
>
> SEV works with SMM, but SEV-ES (and likely SEV-SNP) doesn't work with SMM
> because of the fact that the hypervisor wants to change the guest register
> state to enter SMM, which isn't allowed and results in a VMRUN failure.
Ok. So the same reason why TDX doesn't support SMM either.
> It might be possible to get SMM to work by having separate VMSAs for the SMM
> state, but it is not anything that really has been investigated too deeply.
Should we just drop the SMM leftovers in AmdSevX64.{dsc,fdf} then?
take care,
Gerd
next prev parent reply other threads:[~2021-11-03 6:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-02 7:34 [PATCH 0/2] OvmgPkg: Add SEV launch secret and hashes table areas Dov Murik
2021-11-02 7:34 ` [PATCH 1/2] OvmfPkg/OvmfPkgX64: Add SEV launch secret and hashes table areas to MEMFD Dov Murik
2021-11-02 10:03 ` Gerd Hoffmann
2021-11-02 11:46 ` Dov Murik
2021-11-02 13:29 ` Gerd Hoffmann
2021-11-02 13:53 ` Dov Murik
2021-11-02 14:11 ` Lendacky, Thomas
2021-11-03 6:07 ` Gerd Hoffmann [this message]
2021-11-03 8:13 ` Dov Murik
2021-11-02 7:34 ` [PATCH 2/2] OvmfPkg/Microvm: " Dov Murik
2021-11-02 10:04 ` [PATCH 0/2] OvmgPkg: Add SEV launch secret and hashes table areas Gerd Hoffmann
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