sys/linux: apply no_squash to certain KVM ioctls

For the following KVM ioctls:
 - KVM_SET_GSI_ROUTING
 - KVM_SET_SIGNAL_MASK
 - KVM_SET_MSRS
 - KVM_SET_CPUID
 - KVM_SET_CPUID2

syzkaller is generating squashed blobs, which are less likely to provoke
any interesting behaviors.
Apply the no_squash attribute to these ioctls to have better understanding
of these ioctls' inputs.

Author: ramosian-glider

sys/linux/dev_kvm.txt

@@ -35,7 +35,7 @@ ioctl$KVM_IRQ_LINE_STATUS(fd fd_kvmvm, cmd const[KVM_IRQ_LINE_STATUS], arg ptr[i
 ioctl$KVM_SET_USER_MEMORY_REGION(fd fd_kvmvm, cmd const[KVM_SET_USER_MEMORY_REGION], arg ptr[in, kvm_userspace_memory_region])
 ioctl$KVM_SET_USER_MEMORY_REGION2(fd fd_kvmvm, cmd const[KVM_SET_USER_MEMORY_REGION2], arg ptr[in, kvm_userspace_memory_region2])
 ioctl$KVM_PPC_GET_PVINFO(fd fd_kvmvm, cmd const[KVM_PPC_GET_PVINFO], arg buffer[out])
-ioctl$KVM_SET_GSI_ROUTING(fd fd_kvmvm, cmd const[KVM_SET_GSI_ROUTING], arg ptr[in, kvm_irq_routing])
+ioctl$KVM_SET_GSI_ROUTING(fd fd_kvmvm, cmd const[KVM_SET_GSI_ROUTING], arg ptr[in, kvm_irq_routing]) (no_squash)
 ioctl$KVM_ASSIGN_SET_MSIX_NR(fd fd_kvmvm, cmd const[KVM_ASSIGN_SET_MSIX_NR], arg ptr[in, kvm_assigned_msix_nr])
 ioctl$KVM_ASSIGN_SET_MSIX_ENTRY(fd fd_kvmvm, cmd const[KVM_ASSIGN_SET_MSIX_ENTRY], arg ptr[in, kvm_assigned_msix_entry])
 ioctl$KVM_IOEVENTFD(fd fd_kvmvm, cmd const[KVM_IOEVENTFD], arg ptr[in, kvm_ioeventfd])
@@ -63,7 +63,7 @@ ioctl$KVM_SET_REGS(fd fd_kvmcpu, cmd const[KVM_SET_REGS], arg ptr[in, kvm_regs])
 ioctl$KVM_GET_SREGS(fd fd_kvmcpu, cmd const[KVM_GET_SREGS], arg ptr[out, kvm_sregs])
 ioctl$KVM_SET_SREGS(fd fd_kvmcpu, cmd const[KVM_SET_SREGS], arg ptr[in, kvm_sregs])
 ioctl$KVM_INTERRUPT(fd fd_kvmcpu, cmd const[KVM_INTERRUPT], arg ptr[in, int32])
-ioctl$KVM_SET_SIGNAL_MASK(fd fd_kvmcpu, cmd const[KVM_SET_SIGNAL_MASK], arg ptr[in, kvm_signal_mask])
+ioctl$KVM_SET_SIGNAL_MASK(fd fd_kvmcpu, cmd const[KVM_SET_SIGNAL_MASK], arg ptr[in, kvm_signal_mask]) (no_squash)
 ioctl$KVM_GET_VCPU_EVENTS(fd fd_kvmcpu, cmd const[KVM_GET_VCPU_EVENTS], arg ptr[out, kvm_vcpu_events])
 ioctl$KVM_SET_VCPU_EVENTS(fd fd_kvmcpu, cmd const[KVM_SET_VCPU_EVENTS], arg ptr[in, kvm_vcpu_events])
 ioctl$KVM_GET_MP_STATE(fd fd_kvmcpu, cmd const[KVM_GET_MP_STATE], arg ptr[out, int32])

sys/linux/dev_kvm_amd64.txt

@@ -534,11 +534,11 @@ ioctl$KVM_TRANSLATE(fd fd_kvmcpu, cmd const[KVM_TRANSLATE], arg ptr[inout, kvm_t
 # KVM_GET_MSRS can be both a system and a vcpu ioctl: https://docs.kernel.org/virt/kvm/api.html#kvm-get-msrs
 ioctl$KVM_GET_MSRS_sys(fd fd_kvm, cmd const[KVM_GET_MSRS], arg ptr[inout, kvm_msrs])
 ioctl$KVM_GET_MSRS_cpu(fd fd_kvmcpu, cmd const[KVM_GET_MSRS], arg ptr[inout, kvm_msrs])
-ioctl$KVM_SET_MSRS(fd fd_kvmcpu, cmd const[KVM_SET_MSRS], arg ptr[in, kvm_msrs])
-ioctl$KVM_SET_CPUID(fd fd_kvmcpu, cmd const[KVM_SET_CPUID], arg ptr[in, kvm_cpuid])
+ioctl$KVM_SET_MSRS(fd fd_kvmcpu, cmd const[KVM_SET_MSRS], arg ptr[in, kvm_msrs]) (no_squash)
+ioctl$KVM_SET_CPUID(fd fd_kvmcpu, cmd const[KVM_SET_CPUID], arg ptr[in, kvm_cpuid]) (no_squash)
 # NEED: we should be able to read kvm_cpuid2 with KVM_GET_CPUID2, alter few bits and then call KVM_SET_CPUID2 with that object.
 ioctl$KVM_GET_CPUID2(fd fd_kvmcpu, cmd const[KVM_GET_CPUID2], arg ptr[out, kvm_cpuid2])
-ioctl$KVM_SET_CPUID2(fd fd_kvmcpu, cmd const[KVM_SET_CPUID2], arg ptr[in, kvm_cpuid2])
+ioctl$KVM_SET_CPUID2(fd fd_kvmcpu, cmd const[KVM_SET_CPUID2], arg ptr[in, kvm_cpuid2]) (no_squash)
 ioctl$KVM_GET_SUPPORTED_CPUID(fd fd_kvm, cmd const[KVM_GET_SUPPORTED_CPUID], arg ptr[inout, kvm_cpuid2])
 # KVM_GET_SUPPORTED_HV_CPUID is both a system and a vcpu ioctl: https://docs.kernel.org/virt/kvm/api.html#kvm-get-supported-hv-cpuid
 ioctl$KVM_GET_SUPPORTED_HV_CPUID_sys(fd fd_kvm, cmd const[KVM_GET_SUPPORTED_HV_CPUID], arg ptr[inout, kvm_cpuid2])