[v1,0/3] Add a test case for KVM_X86_DISABLE_EXIT

Message

Manali Shukla March 27, 2024, 5:42 a.m. UTC

By default, HLT instruction executed by guest is intercepted by hypervisor.
However, KVM_CAP_X86_DISABLE_EXITS capability can be used to not intercept
HLT by setting KVM_X86_DISABLE_EXITS_HLT.

By default, vms are created with in-kernel APIC support in KVM selftests.
VM needs to be created without in-kernel APIC support for this test, so
that HLT will exit to userspace. To do so, __vm_create() is modified to not
call KVM_CREATE_IRQCHIP ioctl while creating vm.

Add a test case to test KVM_X86_DISABLE_EXITS_HLT functionality.

Patch 1, 2 -> Preparatory patches to add the KVM_X86_DISABLE_EXITS_HLT test
              case 
Patch 3 -> Adds a test case for KVM_X86_DISABLE_EXITS_HLT

Testing done:
Tested KVM_X86_DISABLE_EXITS_HLT test case on AMD and Intel machines.

Manali Shukla (3):
  KVM: selftests: Add safe_halt() and cli() helpers to common code
  KVM: selftests: Change __vm_create() to create a vm without in-kernel
    APIC
  KVM: selftests: Add a test case for KVM_X86_DISABLE_EXITS_HLT

 tools/testing/selftests/kvm/Makefile          |   1 +
 tools/testing/selftests/kvm/dirty_log_test.c  |   2 +-
 .../selftests/kvm/include/kvm_util_base.h     |   4 +-
 .../selftests/kvm/include/x86_64/processor.h  |  17 +++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  11 +-
 .../kvm/x86_64/halt_disable_exit_test.c       | 113 ++++++++++++++++++
 .../kvm/x86_64/ucna_injection_test.c          |   2 +-
 7 files changed, 143 insertions(+), 7 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c


base-commit: e9da6f08edb0bd4c621165496778d77a222e1174