[PATCH v2 0/6] Enhance event delivery error handling

Ivan Orlov
2024-11-11T10:28:05Z

Currently, the situation when guest accesses MMIO during vectoring is
handled differently on VMX and SVM: on VMX KVM returns internal error,
when SVM goes into infinite loop trying to deliver an event again and
again.

This patch series eliminates this difference by returning a KVM internal
error when guest performs MMIO during vectoring for both VMX and SVM.

Also, introduce a selftest test case which covers the error handling
mentioned above.

V1 -> V2:
- Make commit messages more brief, avoid using pronouns
- Extract SVM error handling into a separate commit
- Introduce a new X86EMUL_ return type and detect the unhandleable
vectoring error in vendor-specific check_emulate_instruction instead of
handling it in the common MMU code (which is specific for cached MMIO)

Ivan Orlov (6):
KVM: x86: Add function for vectoring error generation
KVM: x86: Add emulation status for vectoring during MMIO
KVM: VMX: Handle vectoring error in check_emulate_instruction
KVM: SVM: Handle MMIO during vectroing error
selftests: KVM: extract lidt into helper function
selftests: KVM: Add test case for MMIO during vectoring

arch/x86/include/asm/kvm_host.h | 12 ++++-
arch/x86/kvm/kvm_emulate.h | 2 +
arch/x86/kvm/svm/svm.c | 9 +++-
arch/x86/kvm/vmx/vmx.c | 33 +++++-------
arch/x86/kvm/x86.c | 27 ++++++++++
.../selftests/kvm/include/x86_64/processor.h | 7 +++
.../selftests/kvm/set_memory_region_test.c | 53 ++++++++++++++++++-
.../selftests/kvm/x86_64/sev_smoke_test.c | 2 +-
8 files changed, 119 insertions(+), 26 deletions(-)

--
2.43.0