Prior to commit 9245fd6b8531 ("KVM: x86: model canonical checks more
precisely"), KVM_SET_NESTED_STATE would fail if the state was captured
with L2 active, L1 had CR4.LA57 set, L2 did not, and the
VMCS12.HOST_GSBASE (or other host-state field checked for canonicality)
had an address greater than 48 bits wide.
Add a regression test that reproduces the KVM_SET_NESTED_STATE failure
conditions. To do so, the first three patches add support for 5-level
paging in the selftest L1 VM.
v1 -> v2
Ended the page walking loops before visiting 4K mappings [Yosry]
Changed VM_MODE_PXXV48_4K into VM_MODE_PXXVYY_4K;
use 5-level paging when possible [Sean]
Removed the check for non-NULL vmx_pages in guest_code() [Yosry]
Jim Mattson (4):
KVM: selftests: Use a loop to create guest page tables
KVM: selftests: Use a loop to walk guest page tables
KVM: selftests: Change VM_MODE_PXXV48_4K to VM_MODE_PXXVYY_4K
KVM: selftests: Add a VMX test for LA57 nested state
tools/testing/selftests/kvm/Makefile.kvm | 1 +
.../testing/selftests/kvm/include/kvm_util.h | 4 +-
.../selftests/kvm/include/x86/processor.h | 2 +-
.../selftests/kvm/lib/arm64/processor.c | 2 +-
tools/testing/selftests/kvm/lib/kvm_util.c | 30 ++--
.../testing/selftests/kvm/lib/x86/processor.c | 80 +++++------
tools/testing/selftests/kvm/lib/x86/vmx.c | 6 +-
.../kvm/x86/vmx_la57_nested_state_test.c | 134 ++++++++++++++++++
8 files changed, 197 insertions(+), 62 deletions(-)
create mode 100644 tools/testing/selftests/kvm/x86/vmx_la57_nested_state_test.c
--
2.51.1.851.g4ebd6896fd-goog
