| 881 | } |
| 882 | |
| 883 | static int |
| 884 | vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t mapsize, |
| 885 | struct vm_object **objp, int nprot) |
| 886 | { |
| 887 | struct vmmdev_softc *sc; |
| 888 | vm_paddr_t gpa; |
| 889 | size_t len; |
| 890 | vm_ooffset_t segoff, first, last; |
| 891 | int error, found, segid; |
| 892 | uint16_t lastcpu; |
| 893 | bool sysmem; |
| 894 | |
| 895 | error = vmm_priv_check(curthread->td_ucred); |
| 896 | if (error) |
| 897 | return (error); |
| 898 | |
| 899 | first = *offset; |
| 900 | last = first + mapsize; |
| 901 | if ((nprot & PROT_EXEC) || first < 0 || first >= last) |
| 902 | return (EINVAL); |
| 903 | |
| 904 | sc = vmmdev_lookup2(cdev); |
| 905 | if (sc == NULL) { |
| 906 | /* virtual machine is in the process of being created */ |
| 907 | return (EINVAL); |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * Get a read lock on the guest memory map by freezing any vcpu. |
| 912 | */ |
| 913 | lastcpu = vm_get_maxcpus(sc->vm) - 1; |
| 914 | error = vcpu_lock_one(sc, lastcpu); |
| 915 | if (error) |
| 916 | return (error); |
| 917 | |
| 918 | gpa = 0; |
| 919 | found = 0; |
| 920 | while (!found) { |
| 921 | error = vm_mmap_getnext(sc->vm, &gpa, &segid, &segoff, &len, |
| 922 | NULL, NULL); |
| 923 | if (error) |
| 924 | break; |
| 925 | |
| 926 | if (first >= gpa && last <= gpa + len) |
| 927 | found = 1; |
| 928 | else |
| 929 | gpa += len; |
| 930 | } |
| 931 | |
| 932 | if (found) { |
| 933 | error = vm_get_memseg(sc->vm, segid, &len, &sysmem, objp); |
| 934 | KASSERT(error == 0 && *objp != NULL, |
| 935 | ("%s: invalid memory segment %d", __func__, segid)); |
| 936 | if (sysmem) { |
| 937 | vm_object_reference(*objp); |
| 938 | *offset = segoff + (first - gpa); |
| 939 | } else { |
| 940 | error = EINVAL; |
nothing calls this directly
no test coverage detected