(This RFC patch series is based on AMD's RFC upmv10-snpv3 tree [1]. So far that RFC tree was not submitted for review in qemu-devel.)
In order to enable measured direct kernel boot on SNP, QEMU needs to fill the hashes page when kernel-hashes=on. This relies on several changes to the SNP metadata published by OVMF (See [2] for proposed OVMF patches). Patch 1 pulls the 'kernel-hashes' property from the SEV guest settings to the common settings to make it available for both SEV and SNP. Patch 2 and 3 refactor the code in target/i386/sev.c to allow easier change in patch 4. Patch 4 adds the hashes table for SNP guests (or validates the page as a zero page if kernel-hashes=off). This patch series is also available at [3]. [1] https://github.com/mdroth/qemu/commits/upmv10-snpv3 [2] https://edk2.groups.io/g/devel/message/100625 [3] https://github.com/confidential-containers-demo/qemu/tree/snp-kernel-hashes-v3 v3: * Separate refactoring to their own patches. * Use a new SNP metadata entry which indicates kernel hashes page; during pre-validation, either encrypt the page with the kernel hashes or mark it as zero (thanks Tom). v2: https://lore.kernel.org/qemu-devel/20230216084913.2148508-1-dovmu...@linux.ibm.com/ v2 changes: * Rebase on top of upmv10-snpv3 which includes kernel-hashes. v1: https://lore.kernel.org/qemu-devel/20220329064038.96006-1-dovmurik%40linux.ibm.com/ Cc: Paolo Bonzini <pbonz...@redhat.com> Cc: Daniel P. Berrangé <berra...@redhat.com> Cc: Dr. David Alan Gilbert <dgilb...@redhat.com> Cc: Eduardo Habkost <edua...@habkost.net> Cc: Eric Blake <ebl...@redhat.com> Cc: Markus Armbruster <arm...@redhat.com> Cc: Marcelo Tosatti <mtosa...@redhat.com> Cc: Gerd Hoffmann <kra...@redhat.com> Cc: James Bottomley <j...@linux.ibm.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> Dov Murik (4): qapi, i386: Move kernel-hashes to SevCommonProperties i386/sev: Extract build_kernel_loader_hashes i386/sev: Reorder struct declarations i386/sev: Allow measured direct kernel boot on SNP qapi/qom.json | 12 +-- include/hw/i386/pc.h | 2 + target/i386/sev.c | 238 +++++++++++++++++++++++++------------------ 3 files changed, 146 insertions(+), 106 deletions(-) -- 2.25.1
