github.com/google/syzkaller@v0.0.0-20251211124644-a066d2bc4b02/sys/linux/test/amd64-syz_kvm_nested_create_vm-hlt (about)

     1  #
     2  # requires: arch=amd64 -threaded
     3  #
     4  r0 = openat$kvm(0, &AUTO='/dev/kvm\x00', 0x0, 0x0)
     5  r1 = ioctl$KVM_CREATE_VM(r0, AUTO, 0x0)
     6  r2 = syz_kvm_setup_syzos_vm$x86(r1, &(0x7f0000c00000/0x400000)=nil)
     7  
     8  # Create a nested VM that just HLTs.
     9  #
    10  r3 = syz_kvm_add_vcpu$x86(r2, &AUTO={0x0, &AUTO=[@enable_nested={AUTO, AUTO, 0x0}, @nested_create_vm={AUTO, AUTO, 0x0}, @nested_load_code={AUTO, AUTO, {0x0, "f4"}}, @nested_vmlaunch={AUTO, AUTO, 0x0}], AUTO})
    11  r4 = ioctl$KVM_GET_VCPU_MMAP_SIZE(r0, AUTO)
    12  r5 = mmap$KVM_VCPU(&(0x7f0000009000/0x1000)=nil, r4, 0x3, 0x1, r3, 0x0)
    13  
    14  # L2 VM should halt, after which the nested exit handle should uexit with 0xe2e20001
    15  # (0x1 is SYZOS_NESTED_EXIT_REASON_HLT).
    16  #
    17  ioctl$KVM_RUN(r3, AUTO, 0x0)
    18  syz_kvm_assert_syzos_uexit$x86(r5, 0xe2e20001)
    19  
    20  # KVM_RUN should exit with KVM_EXIT_MMIO due to guest_uexit(-1).
    21  #
    22  ioctl$KVM_RUN(r3, AUTO, 0x0)
    23  syz_kvm_assert_syzos_uexit$x86(r5, 0xffffffff)