[PATCH 0/6] Add initial GHCB support for SEV-ES selftests

Peter Gonda
2024-04-09T13:40:15Z

Adding GHCB support for selftests. Very similar code to the ucall
functionality, I didn't refactor anything common out since I was unsure
with just two instances that is required. If pulling out common code
between those two is preferred please let me know. The series only adds a
single usage of the GHCB which is a special outsb GHCB exit to allow for
passing the 64-bit ucall pointer. In future series we can test more GHCB
functionality of KVM. I'd like to base some SNP smoke tests off of this
and the current SEV selftest work.

base-commit: 40e09b3ccfacc640d58e1e3d6b8f29b2db0a9848

Cc: Vishal Annapurve <vannapurve@google.com>
Cc: Ackerley Tng <ackerleytng@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Carlos Bilbao <carlos.bilbao@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: kvm@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Peter Gonda <pgonda@google.com>

Peter Gonda (6):
Add GHCB with setters and getters
Add arch specific additional guest pages
Add vm_vaddr_alloc_pages_shared()
Add GHCB allocations and helpers
Add is_sev_enabled() helpers
Add ability for SEV-ES guests to use ucalls via GHCB

tools/testing/selftests/kvm/Makefile | 2 +-
.../selftests/kvm/include/kvm_util_base.h | 4 +
.../selftests/kvm/include/x86_64/sev.h | 7 +
.../selftests/kvm/include/x86_64/svm.h | 106 +++++++++++++
tools/testing/selftests/kvm/lib/kvm_util.c | 22 ++-
.../selftests/kvm/lib/x86_64/processor.c | 8 +
tools/testing/selftests/kvm/lib/x86_64/sev.c | 149 ++++++++++++++++++
.../testing/selftests/kvm/lib/x86_64/ucall.c | 17 ++
.../selftests/kvm/x86_64/sev_smoke_test.c | 22 +--
9 files changed, 313 insertions(+), 24 deletions(-)

--
2.44.0.478.gd926399ef9-goog