[PATCH 0/4] KVM: SEV: Support direct setting of VMSA for SEV-SNP guests

["Jörg Rödel" <joro@8bytes.org>]

From: Joerg Roedel <joerg.roedel@amd.com>

Hi,

Here is a set of patches to support the VMM to provide a VMSA directly
to KVM which will then be used by the BSP of the SEV-SNP VM. The
use-case is IGVM loading, where the IGVM file contains a VMSA image
which must be loaded into the initial memory image of the VM as-is to
guarantee the expected launch measurement.

The first patch re-works guest-VMSA handling and streamlines the state
handling to make it more clear and maintainable. That patch accounts
for the biggest part if the changes.

I have tested these changes together with the planes patches and
COCONUT-SVSM and can confirm that the launch measurment is correct
again with these changes.

The changes are based on previous work by Roy Hopkins[1].

Please review.

Thanks,

	Joerg

[1] https://github.com/torvalds/linux/commit/e00e081276b2cd9f1400ec5b1a9cd97f8b5c4d58

Joerg Roedel (4):
  kvm: svm: Streamline VMSA setting for VCPUs
  kvm: svm: Defer VMSA allocation to LAUNCH_FINISH stage
  kvm: svm: Support guest-provided VMSA for launching
  kvm: svm: Support KVM_SEV_SNP_PAGE_TYPE_VMSA at SNP_LAUNCH_UPDATE

 arch/x86/include/uapi/asm/kvm.h |   1 +
 arch/x86/kvm/svm/sev.c          | 419 +++++++++++++++++++++++---------
 arch/x86/kvm/svm/svm.h          |  32 ++-
 arch/x86/kvm/x86.c              |   1 +
 include/uapi/linux/kvm.h        |   1 +
 5 files changed, 337 insertions(+), 117 deletions(-)

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2.53.0