github.com/google/syzkaller@v0.0.0-20251211124644-a066d2bc4b02/sys/linux/test/amd64-syz_kvm_setup_syzos_vm (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$x86(r1, &(0x7f0000c00000/0x400000)=nil)
     7  # Perform two uexits. The first one is done via a code blob:
     8  #       4831ff			xor rdi,rdi
     9  #       48c7c600000400		mov rsi,0x40000
    10  #       4881c600010000		add rsi,0x100
    11  #       48893e			mov QWORD PTR [rsi],rdi
    12  # The second uexit is done via a syzos API command that sets uexit exit code to 0xaaaa.
    13  #
    14  r3 = syz_kvm_add_vcpu$x86(r2, &AUTO={0x0, &AUTO=[@code={AUTO, AUTO, {"4831ff48c7c6000004004881c60001000048893e", 0xc3}}, @uexit={AUTO, AUTO, 0xaaaa}], AUTO})
    15  r4 = ioctl$KVM_GET_VCPU_MMAP_SIZE(r0, AUTO)
    16  r5 = mmap$KVM_VCPU(&(0x7f0000009000/0x1000)=nil, r4, 0x3, 0x1, r3, 0x0)
    17  
    18  # Run till the first uexit.
    19  #
    20  ioctl$KVM_RUN(r3, AUTO, 0x0)
    21  syz_kvm_assert_syzos_uexit$x86(r5, 0x0)
    22  # Run till the second uexit.
    23  #
    24  ioctl$KVM_RUN(r3, AUTO, 0x0)
    25  syz_kvm_assert_syzos_uexit$x86(r5, 0xaaaa)
    26  
    27  # Run till the end of guest_main().
    28  #
    29  ioctl$KVM_RUN(r3, AUTO, 0x0)
    30  
    31  # Ensure that exit reason is KVM_EXIT_MMIO and uexit code is UEXIT_END.
    32  #
    33  syz_kvm_assert_syzos_kvm_exit$x86(r5, 0x6)
    34  syz_kvm_assert_syzos_uexit$x86(r5, 0xffffffffffffffff)