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. */
20enum 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 */
39struct lguest_pending {
40	__u8 trap;
41	__u8 insn[7];
42	__u32 addr;
43};
44#endif /* _LINUX_LGUEST_LAUNCHER */
45