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lguest: remove lguest bus definitions from header. 

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-02-11 15:22:01 +10:30
parent d9028eda7b
commit b3e28b65de
1 changed files with 2 additions and 47 deletions
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49
include/linux/lguest_launcher.h
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@ -8,52 +8,13 @@
*
* The Guest needs devices to do anything useful. Since we don't let it touch
* real devices (think of the damage it could do!) we provide virtual devices.
* We could emulate a PCI bus with various devices on it, but that is a fairly
* complex burden for the Host and suboptimal for the Guest, so we have our own
* simple lguest bus and we use "virtio" drivers. These drivers need a set of
* routines from us which will actually do the virtual I/O, but they handle all
* the net/block/console stuff themselves. This means that if we want to add
* a new device, we simply need to write a new virtio driver and create support
* for it in the Launcher: this code won't need to change.
* We emulate a PCI bus with virtio devices on it; we used to have our own
* lguest bus which was far simpler, but this tests the virtio 1.0 standard.
*
* Virtio devices are also used by kvm, so we can simply reuse their optimized
* device drivers. And one day when everyone uses virtio, my plan will be
* complete. Bwahahahah!
*
* Devices are described by a simplified ID, a status byte, and some "config"
* bytes which describe this device's configuration. This is placed by the
* Launcher just above the top of physical memory:
*/
struct lguest_device_desc {
/* The device type: console, network, disk etc. Type 0 terminates. */
__u8 type;
/* The number of virtqueues (first in config array) */
__u8 num_vq;
/*
* The number of bytes of feature bits. Multiply by 2: one for host
* features and one for Guest acknowledgements.
*/
__u8 feature_len;
/* The number of bytes of the config array after virtqueues. */
__u8 config_len;
/* A status byte, written by the Guest. */
__u8 status;
__u8 config[0];
};
/*D:135
* This is how we expect the device configuration field for a virtqueue
* to be laid out in config space.
*/
struct lguest_vqconfig {
/* The number of entries in the virtio_ring */
__u16 num;
/* The interrupt we get when something happens. */
__u16 irq;
/* The page number of the virtio ring for this device. */
__u32 pfn;
};
/*:*/
/* Write command first word is a request. */
enum lguest_req
@ -80,10 +41,4 @@ struct lguest_pending {
__u8 insn[7];
__u32 addr;
};
/*
* The alignment to use between consumer and producer parts of vring.
* x86 pagesize for historical reasons.
*/
#define LGUEST_VRING_ALIGN 4096
#endif /* _LINUX_LGUEST_LAUNCHER */