include/linux/lguest_launcher.h

   1 #ifndef _LINUX_LGUEST_LAUNCHER
   2 #define _LINUX_LGUEST_LAUNCHER
   3 /* Everything the "lguest" userspace program needs to know. */
   4 #include <linux/types.h>
   5
   6 /*D:010
   7  * Drivers
   8  *
   9  * The Guest needs devices to do anything useful.  Since we don't let it touch
  10  * real devices (think of the damage it could do!) we provide virtual devices.
  11  * We emulate a PCI bus with virtio devices on it; we used to have our own
  12  * lguest bus which was far simpler, but this tests the virtio 1.0 standard.
  13  *
  14  * Virtio devices are also used by kvm, so we can simply reuse their optimized
  15  * device drivers.  And one day when everyone uses virtio, my plan will be
  16  * complete.  Bwahahahah!
  17  */
  18
  19 /* Write command first word is a request. */
  20 enum lguest_req
  21 {
  22         LHREQ_INITIALIZE, /* + base, pfnlimit, start */
  23         LHREQ_GETDMA, /* No longer used */
  24         LHREQ_IRQ, /* + irq */
  25         LHREQ_BREAK, /* No longer used */
  26         LHREQ_EVENTFD, /* No longer used. */
  27         LHREQ_GETREG, /* + offset within struct pt_regs (then read value). */
  28         LHREQ_SETREG, /* + offset within struct pt_regs, value. */
  29         LHREQ_TRAP, /* + trap number to deliver to guest. */
  30 };
  31
  32 /*
  33  * This is what read() of the lguest fd populates.  trap ==
  34  * LGUEST_TRAP_ENTRY for an LHCALL_NOTIFY (addr is the
  35  * argument), 14 for a page fault in the MMIO region (addr is
  36  * the trap address, insn is the instruction), or 13 for a GPF
  37  * (insn is the instruction).
  38  */
  39 struct lguest_pending {
  40         __u8 trap;
  41         __u8 insn[7];
  42         __u32 addr;
  43 };
  44 #endif /* _LINUX_LGUEST_LAUNCHER */