KVM: selftests: nSVM: Add svm_nested_soft_inject_test

Browse source

Add a KVM self-test that checks whether a nSVM L1 is able to successfully
inject a software interrupt, a soft exception and a NMI into its L2 guest.

In practice, this tests both the next_rip field consistency and
L1-injected event with intervening L0 VMEXIT during its delivery:
the first nested VMRUN (that's also trying to inject a software interrupt)
will immediately trigger a L0 NPF.
This L0 NPF will have zero in its CPU-returned next_rip field, which if
incorrectly reused by KVM will trigger a #PF when trying to return to
such address 0 from the interrupt handler.

For NMI injection this tests whether the L1 NMI state isn't getting
incorrectly mixed with the L2 NMI state if a L1 -> L2 NMI needs to be
re-injected.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
[sean: check exact L2 RIP on first soft interrupt]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Message-Id: <d5f3d56528558ad8e28a9f1e1e4187f5a1e6770a.1651440202.git.maciej.szmigiero@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Maciej S. Szmigiero 2022-05-02 00:07:35 +02:00 • committed by Paolo Bonzini

parent 159fc6fa3b

commit d896987125

7 changed files with 249 additions and 7 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

tools/testing/selftests/kvm/.gitignore vendored

View file

1

tools/testing/selftests/kvm/Makefile

View file

17

tools/testing/selftests/kvm/include/x86_64/processor.h

View file

12

tools/testing/selftests/kvm/include/x86_64/svm_util.h

View file

1

tools/testing/selftests/kvm/x86_64/evmcs_test.c

View file

5

tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c

View file

217

tools/testing/selftests/kvm/x86_64/svm_nested_soft_inject_test.c

View file