illumos gate

With the patch applied, the newly written unit tests now passes. Normal bhyve guests can still boot and run as expected. Walking the devmem list associated with the instance shows the lowmem and highmem segments for that guest, in addition to the bootrom:

{
    vde_node = {
        list_next = 0xfffffe5dcb04b400
        list_prev = 0xfffffe59f02abd30
    }
    vde_segid = 0x1
    vde_name = [ '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', ... ]
    vde_len = 0x1400000
    vde_off = 0x400000000000
}
{
    vde_node = {
        list_next = 0xfffffe5dcb04b500
        list_prev = 0xfffffe5dcb04b300
    }
    vde_segid = 0
    vde_name = [ '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', ... ]
    vde_len = 0xc0000000
    vde_off = 0x400001400000
}
{
    vde_node = {
        list_next = 0xfffffe59f02abd30
        list_prev = 0xfffffe5dcb04b400
    }
    vde_segid = 0x2
    vde_name = [ "bootrom" ]
    vde_len = 0x1000000
    vde_off = 0x4000c1400000
}

The propolis runtime is able to use the new devmem access to sysmem segments in addition to the bootrom.

A dump of the machine after the tests was taken to confirm that no kmem leaks or corruption occurred and no problems on that front were observed.