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 */

 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 could emulate a PCI bus with various devices on it, but that is a fairly
12 * complex burden for the Host and suboptimal for the Guest, so we have our own
13 * simple lguest bus and we use "virtio" drivers.  These drivers need a set of
14 * routines from us which will actually do the virtual I/O, but they handle all
15 * the net/block/console stuff themselves.  This means that if we want to add
16 * a new device, we simply need to write a new virtio driver and create support
17 * for it in the Launcher: this code won't need to change.
18 *
19 * Virtio devices are also used by kvm, so we can simply reuse their optimized
20 * device drivers.  And one day when everyone uses virtio, my plan will be
21 * complete.  Bwahahahah!
22 *
23 * Devices are described by a simplified ID, a status byte, and some "config"
24 * bytes which describe this device's configuration.  This is placed by the
25 * Launcher just above the top of physical memory:
26 */
27struct lguest_device_desc {
28	/* The device type: console, network, disk etc.  Type 0 terminates. */
29	__u8 type;
30	/* The number of virtqueues (first in config array) */
31	__u8 num_vq;
32	/*
33	 * The number of bytes of feature bits.  Multiply by 2: one for host
34	 * features and one for Guest acknowledgements.
35	 */
36	__u8 feature_len;
37	/* The number of bytes of the config array after virtqueues. */
38	__u8 config_len;
39	/* A status byte, written by the Guest. */
40	__u8 status;
41	__u8 config[0];
42};
43
44/*D:135
45 * This is how we expect the device configuration field for a virtqueue
46 * to be laid out in config space.
47 */
48struct lguest_vqconfig {
49	/* The number of entries in the virtio_ring */
50	__u16 num;
51	/* The interrupt we get when something happens. */
52	__u16 irq;
53	/* The page number of the virtio ring for this device. */
54	__u32 pfn;
55};
56/*:*/
57
58/* Write command first word is a request. */
59enum lguest_req
60{
61	LHREQ_INITIALIZE, /* + base, pfnlimit, start */
62	LHREQ_GETDMA, /* No longer used */
63	LHREQ_IRQ, /* + irq */
64	LHREQ_BREAK, /* No longer used */
65	LHREQ_EVENTFD, /* + address, fd. */
 
 
 
66};
67
68/*
69 * The alignment to use between consumer and producer parts of vring.
70 * x86 pagesize for historical reasons.
 
 
 
71 */
72#define LGUEST_VRING_ALIGN	4096
 
 
 
 
73#endif /* _LINUX_LGUEST_LAUNCHER */