On 16/02/2023 10:06, Dov Murik wrote:
> (Note: This is a new version of this one-year-old patch series; the v1
> series [1] got a few Acked-by but it's been so long that I don't
> consider them relevant anymore.)
>
> AMD SEV and SEV-ES support measured direct boot with
> kernel/initrd/cmdline hashes injected by QEMU and verified by OVMF
> during boot.
>
> To enable the same approach for AMD SEV-SNP we make sure the page in
> which QEMU inserts the hashes of kernel/initrd/cmdline is not already
> pre-validated, as SNP doesn't allow validating a page twice.
>
> The first patch rearranges the pages in AmdSevX64's MEMFD so they are in
> the same order both as in the main target (OvmfPkgX64), with the
> exception of the SEV Launch Secret page which isn't defined in
> OvmfPkgX64.
>
> The second patch modifies the SNP metadata structure such that on
> AmdSev target the SEV Launch Secret page is not included in the ranges
> that are pre-validated (zero pages) by the VMM; instead the VMM will
> insert content into this page (the hashes table), or mark it explicitly
> as a zero page if no hashes are added.
>
> A corresponding RFC patch to QEMU will be published soon in qemu-devel.
The corresponding QEMU RFC patch series is at:
https://lore.kernel.org/qemu-devel/20230216084913.2148508-1-dovmu...@linux.ibm.com/
and the QEMU tree can be fetched from:
https://github.com/confidential-containers-demo/qemu/tree/snp-kernel-hashes-v2
This edk2 series is also published at:
https://github.com/confidential-containers-demo/edk2/tree/snp-kernel-hashes-v2
-Dov
>
> Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
> Cc: Jiewen Yao <jiewen....@intel.com>
> Cc: Jordan Justen <jordan.l.jus...@intel.com>
> Cc: Gerd Hoffmann <kra...@redhat.com>
> Cc: Erdem Aktas <erdemak...@google.com>
> Cc: James Bottomley <j...@linux.ibm.com>
> Cc: Min Xu <min.m...@intel.com>
> Cc: Tom Lendacky <thomas.lenda...@amd.com>
> Cc: Michael Roth <michael.r...@amd.com>
> Cc: Ashish Kalra <ashish.ka...@amd.com>
> Cc: Mario Smarduch <mario.smard...@amd.com>
> Cc: Tobin Feldman-Fitzthum <to...@linux.ibm.com>
>
> ---
>
> v2 changes:
> * Rebased on master
> * Updated AmdSev MEMFD size to match OvmfX64
>
> v1:
> [1] https://edk2.groups.io/g/devel/message/88137
>
>
> Dov Murik (2):
> OvmfPkg/AmdSev: Reorder MEMFD pages to match the order in
> OvmfPkgX64.fdf
> OvmfPkg/ResetVector: Exclude SEV launch secrets page from
> pre-validation
>
> OvmfPkg/AmdSev/AmdSevX64.fdf | 27 ++++++++++----------
> OvmfPkg/ResetVector/ResetVector.nasmb | 14 +++++++++-
> 2 files changed, 27 insertions(+), 14 deletions(-)
>
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