github.com/google/syzkaller@v0.0.0-20251211124644-a066d2bc4b02/sys/linux/test/arm64-syz_kvm_setup_syzos_vm-enable-pmu-msr-emul-0 (about)

     1  #
     2  # requires: arch=arm64 -threaded
     3  #
     4  # This series of tests exercise the PMU registers that are exposed in the QEMU emulation mode.
     5  # They should not be used in the corpus when running on real HW.
     6  #
     7  r0 = openat$kvm(0, &AUTO='/dev/kvm\x00', 0x0, 0x0)
     8  r1 = ioctl$KVM_CREATE_VM(r0, AUTO, 0x0)
     9  r2 = syz_kvm_setup_syzos_vm$arm64(r1, &(0x7f0000c00000/0x400000)=nil)
    10  #
    11  # 0x603000000013c4f1 is PMINTENSET_EL1.
    12  # 0x603000000013c4f2 is PMINTENCLR_EL1.
    13  # 0x603000000013dce0 is PMCR_EL0.
    14  # 0x603000000013dce1 is PMCNTENSET_EL0.
    15  # 0x603000000013dce2 is PMCNTENCLR_EL0.
    16  # 0x603000000013dce3 is PMOVSCLR_EL0.
    17  # 0x603000000013dce4 is PMSWINC_EL0.
    18  # 0x603000000013dce5 is PMSELR_EL0.
    19  # 0x603000000013dce8 is PMCCNTR_EL0.
    20  # 0x603000000013dce9 is PMXEVTYPER_EL0.
    21  # Writes to these registers will trigger kvm_handle_sys_reg in arch/arm64/kvm/sys_regs.c
    22  # This is done to illustrate that PMU is accessible.
    23  # 0x8 corresponds to the KVM_ARM_VCPU_PMU_V3 feature bit and is required to enable PMU.
    24  #
    25  r3 = syz_kvm_add_vcpu$arm64(r2, &AUTO={0x0, &AUTO=[@msr={AUTO, AUTO, {0x603000000013c4f1, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013c4f2, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce0, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce1, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce2, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce3, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce4, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce5, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce8, 0x8000}}, @msr={AUTO, AUTO, {0x603000000013dce9, 0x8000}}], AUTO}, &AUTO=[@featur1={0x1, 0x8}], 0x1)
    26  #
    27  # Call ioctl(KVM_SET_DEVICE_ATTR) with group=KVM_ARM_VCPU_PMU_V3_CTRL and attr=KVM_ARM_VCPU_PMU_V3_INIT,
    28  # as per https://www.kernel.org/doc/Documentation/virt/kvm/devices/vcpu.rst.
    29  #
    30  ioctl$KVM_SET_DEVICE_ATTR_vcpu(r3, AUTO, &AUTO=@attr_pmu_init)
    31  
    32  r4 = ioctl$KVM_GET_VCPU_MMAP_SIZE(r0, AUTO)
    33  r5 = mmap$KVM_VCPU(&(0x7f0000009000/0x1000)=nil, r4, 0x3, 0x1, r3, 0x0)
    34  #
    35  # Run till the end of guest_main(). 0xffffffffffffffff is UEXIT_END.
    36  #
    37  ioctl$KVM_RUN(r3, AUTO, 0x0)
    38  syz_kvm_assert_syzos_uexit$arm64(r5, 0xffffffffffffffff)
    39  syz_kvm_assert_reg(r3, 0x603000000013c4f1, 0x8000)
    40  syz_kvm_assert_reg(r3, 0x603000000013c4f2, 0x8000)
    41  syz_kvm_assert_reg(r3, 0x603000000013dce0, 0x8000)
    42  syz_kvm_assert_reg(r3, 0x603000000013dce1, 0x8000)
    43  syz_kvm_assert_reg(r3, 0x603000000013dce2, 0x8000)
    44  syz_kvm_assert_reg(r3, 0x603000000013dce3, 0x8000)
    45  syz_kvm_assert_reg(r3, 0x603000000013dce4, 0x8000)
    46  syz_kvm_assert_reg(r3, 0x603000000013dce5, 0x8000)
    47  syz_kvm_assert_reg(r3, 0x603000000013dce8, 0x8000)
    48  syz_kvm_assert_reg(r3, 0x603000000013dce9, 0x8000)