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
--
2.34.1
