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* [PATCH v2 0/2] OvmfPkg: Enable measured direct boot on AMD SEV-SNP
@ 2023-02-16  8:06 Dov Murik
  2023-02-16  8:06 ` [PATCH v2 1/2] OvmfPkg/AmdSev: Reorder MEMFD pages to match the order in OvmfPkgX64.fdf Dov Murik
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Dov Murik @ 2023-02-16  8:06 UTC (permalink / raw)
  To: devel
  Cc: Dov Murik, Ard Biesheuvel, Jiewen Yao, Jordan Justen,
	Gerd Hoffmann, Erdem Aktas, James Bottomley, Min Xu, Tom Lendacky,
	Michael Roth, Ashish Kalra, Mario Smarduch,
	Tobin Feldman-Fitzthum

(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.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Cc: Mario Smarduch <mario.smarduch@amd.com>
Cc: Tobin Feldman-Fitzthum <tobin@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(-)

-- 
2.25.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2023-02-16  8:53 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-02-16  8:06 [PATCH v2 0/2] OvmfPkg: Enable measured direct boot on AMD SEV-SNP Dov Murik
2023-02-16  8:06 ` [PATCH v2 1/2] OvmfPkg/AmdSev: Reorder MEMFD pages to match the order in OvmfPkgX64.fdf Dov Murik
2023-02-16  8:06 ` [PATCH v2 2/2] OvmfPkg/ResetVector: Exclude SEV launch secrets page from pre-validation Dov Murik
2023-02-16  8:53 ` [PATCH v2 0/2] OvmfPkg: Enable measured direct boot on AMD SEV-SNP Dov Murik

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