[RFC 00/16] KVM: selftests: Add tests for SEV, SEV-ES, and SEV-SNP guests

[Michael Roth]

These patches and are also available at:

  https://github.com/mdroth/linux/commits/sev-selftests-rfc1

They are based on top of v5 of Brijesh's SEV-SNP hypervisor patches[1]
to allow for SEV-SNP testing and provide some context for the overall
design, but the SEV/SEV-ES patches can be carved out into a separate
series as needed.

== OVERVIEW ==

This series introduces a set of memory encryption-related parameter/hooks
in the core kselftest library, then uses the hooks to implement a small
library for creating/managing SEV, SEV-ES, SEV-SNP guests. This library
is then used to implement a basic boot/memory test that's run for all
variants of SEV/SEV-ES/SEV-SNP guest types, as well as a set of SEV-SNP
tests that cover various permutations of pvalidate/page-state changes.

- Patches 1-7 implement SEV boot tests and should run against existing
  kernels
- Patch 8 is a KVM changes that's required to allow SEV-ES/SEV-SNP
  guests to boot with an externally generated page table, and is a
  host kernel prequisite for the remaining patches in the series.
- Patches 9-12 extend the boot tests to cover SEV-ES
- Patches 13-16 extend the boot testst to cover SEV-SNP, and introduce
  an additional test for page-state changes.

Any review/comments are greatly appreciated!

[1] https://lore.kernel.org/linux-mm/20210820155918.7518-1-brijesh.singh@xxxxxxx/

----------------------------------------------------------------
Michael Roth (16):
      KVM: selftests: move vm_phy_pages_alloc() earlier in file
      KVM: selftests: add hooks for managing encrypted guest memory
      KVM: selftests: handle encryption bits in page tables
      KVM: selftests: set CPUID before setting sregs in vcpu creation
      KVM: selftests: add support for encrypted vm_vaddr_* allocations
      KVM: selftests: add library for creating/interacting with SEV guests
      KVM: selftests: add SEV boot tests
      KVM: SVM: include CR3 in initial VMSA state for SEV-ES guests
      KVM: selftests: account for error code in #VC exception frame
      KVM: selftests: add support for creating SEV-ES guests
      KVM: selftests: add library for handling SEV-ES-related exits
      KVM: selftests: add SEV-ES boot tests
      KVM: selftests: add support for creating SEV-SNP guests
      KVM: selftests: add helpers for SEV-SNP-related instructions/exits
      KVM: selftests: add SEV-SNP boot tests
      KVM: selftests: add SEV-SNP tests for page-state changes

 arch/x86/include/asm/kvm-x86-ops.h                 |   1 +
 arch/x86/include/asm/kvm_host.h                    |   1 +
 arch/x86/kvm/svm/svm.c                             |  22 ++
 arch/x86/kvm/vmx/vmx.c                             |   8 +
 arch/x86/kvm/x86.c                                 |   3 +-
 tools/testing/selftests/kvm/.gitignore             |   2 +
 tools/testing/selftests/kvm/Makefile               |   3 +
 tools/testing/selftests/kvm/include/kvm_util.h     |   8 +
 tools/testing/selftests/kvm/include/x86_64/sev.h   |  70 ++++
 .../selftests/kvm/include/x86_64/sev_exitlib.h     |  20 ++
 tools/testing/selftests/kvm/include/x86_64/svm.h   |  35 ++
 .../selftests/kvm/include/x86_64/svm_util.h        |   2 +
 tools/testing/selftests/kvm/lib/kvm_util.c         | 249 +++++++++-----
 .../testing/selftests/kvm/lib/kvm_util_internal.h  |  10 +
 tools/testing/selftests/kvm/lib/x86_64/handlers.S  |   4 +-
 tools/testing/selftests/kvm/lib/x86_64/processor.c |  30 +-
 tools/testing/selftests/kvm/lib/x86_64/sev.c       | 381 +++++++++++++++++++++
 .../testing/selftests/kvm/lib/x86_64/sev_exitlib.c | 326 ++++++++++++++++++
 .../selftests/kvm/x86_64/sev_all_boot_test.c       | 367 ++++++++++++++++++++
 .../selftests/kvm/x86_64/sev_snp_psc_test.c        | 378 ++++++++++++++++++++
 20 files changed, 1820 insertions(+), 100 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/sev.h
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/sev_exitlib.h
 create mode 100644 tools/testing/selftests/kvm/lib/x86_64/sev.c
 create mode 100644 tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
 create mode 100644 tools/testing/selftests/kvm/x86_64/sev_all_boot_test.c
 create mode 100644 tools/testing/selftests/kvm/x86_64/sev_snp_psc_test.c