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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 | */ |
27 | struct 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 | */ |
48 | struct 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. */ |
59 | enum 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 */ |
74 |
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od-2011-09-04
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v2.6.34-rc5
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