On 4/1/24 08:20, Manali Shukla wrote:
> 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.
>
> Add a test case to test KVM_X86_DISABLE_EXITS_HLT functionality.
>
> Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> Signed-off-by: Manali Shukla <manali.shukla@xxxxxxx>
> ---
> tools/testing/selftests/kvm/Makefile | 1 +
> .../kvm/x86_64/halt_disable_exit_test.c | 119 ++++++++++++++++++
> 2 files changed, 120 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index c75251d5c97c..9f72abb95d2e 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -89,6 +89,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test
> TEST_GEN_PROGS_x86_64 += x86_64/smaller_maxphyaddr_emulation_test
> TEST_GEN_PROGS_x86_64 += x86_64/smm_test
> TEST_GEN_PROGS_x86_64 += x86_64/state_test
> +TEST_GEN_PROGS_x86_64 += x86_64/halt_disable_exit_test
> TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
> TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
> TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
> diff --git a/tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c b/tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c
> new file mode 100644
> index 000000000000..4cc6a09906a2
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/x86_64/halt_disable_exit_test.c
> @@ -0,0 +1,119 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * KVM disable halt exit test
> + *
> + * Copyright (C) 2024 Advanced Micro Devices, Inc.
> + */
> +#include <pthread.h>
> +#include <signal.h>
> +#include "kvm_util.h"
> +#include "processor.h"
> +#include "test_util.h"
> +
> +#define SIG_IPI SIGUSR1
> +static pthread_t task_thread, vcpu_thread;
> +
> +static void guest_code(uint64_t *is_hlt_exec)
> +{
> + while (!READ_ONCE(*is_hlt_exec))
> + ;
> +
> + safe_halt();
May I confirm if this selftest works on nested L1 VM as a hypervisor?
Thank you very much!
Dongli Zhang
