On Tue, Apr 22, 2025, Zack Rusin wrote:
> Add a testcase to exercise KVM_CAP_X86_VMWARE_HYPERCALL and validate
> that KVM exits to userspace on hypercalls and registers are correctly
> preserved.
>
> Signed-off-by: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
> Cc: Doug Covelli <doug.covelli@xxxxxxxxxxxx>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Cc: Shuah Khan <shuah@xxxxxxxxxx>
> Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
> Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> Cc: Joel Stanley <joel@xxxxxxxxx>
> Cc: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
> Cc: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: kvm@xxxxxxxxxxxxxxx
> Cc: linux-kselftest@xxxxxxxxxxxxxxx
> ---
> tools/include/uapi/linux/kvm.h | 3 +
> tools/testing/selftests/kvm/Makefile.kvm | 1 +
> .../selftests/kvm/x86/vmware_hypercall_test.c | 121 ++++++++++++++++++
> 3 files changed, 125 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/x86/vmware_hypercall_test.c
>
> diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
> index 502ea63b5d2e..3b3ad1827245 100644
> --- a/tools/include/uapi/linux/kvm.h
> +++ b/tools/include/uapi/linux/kvm.h
> @@ -933,6 +933,9 @@ struct kvm_enable_cap {
> #define KVM_CAP_PRE_FAULT_MEMORY 236
> #define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237
> #define KVM_CAP_X86_GUEST_MODE 238
> +#define KVM_CAP_X86_VMWARE_BACKDOOR 239
> +#define KVM_CAP_X86_VMWARE_HYPERCALL 240
> +#define KVM_CAP_X86_VMWARE_NESTED_BACKDOOR_L0 241
Can I bribe/convince you to port KVM-Unit-Tests' x86/vmware_backdoors.c to a KVM
selftest that verifies KVM's behavior for the various combination of module param
and capability values?
