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lguest: the guest code

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lguest is a simple hypervisor for Linux on Linux.  Unlike kvm it doesn't need
VT/SVM hardware.  Unlike Xen it's simply "modprobe and go".  Unlike both, it's
5000 lines and self-contained.

Performance is ok, but not great (-30% on kernel compile).  But given its
hackability, I expect this to improve, along with the paravirt_ops code which
it supplies a complete example for.  There's also a 64-bit version being
worked on and other craziness.

But most of all, lguest is awesome fun!  Too much of the kernel is a big ball
of hair.  lguest is simple enough to dive into and hack, plus has some warts
which scream "fork me!".

This patch:

This is the code and headers required to make an i386 kernel an lguest guest.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
2007-07-19 01:49:22 -07:00
committed by Linus Torvalds
parent 5992b6dac0
commit 07ad157f6e
5 changed files with 878 additions and 0 deletions
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48
include/linux/lguest_bus.h Normal file
View File

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#ifndef _ASM_LGUEST_DEVICE_H
#define _ASM_LGUEST_DEVICE_H
/* Everything you need to know about lguest devices. */
#include <linux/device.h>
#include <linux/lguest.h>
#include <linux/lguest_launcher.h>
struct lguest_device {
/* Unique busid, and index into lguest_page->devices[] */
unsigned int index;
struct device dev;
/* Driver can hang data off here. */
void *private;
};
/* By convention, each device can use irq index+1 if it wants to. */
static inline int lgdev_irq(const struct lguest_device *dev)
{
return dev->index + 1;
}
/* dma args must not be vmalloced! */
void lguest_send_dma(unsigned long key, struct lguest_dma *dma);
int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
unsigned int num, u8 irq);
void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas);
/* Map the virtual device space */
void *lguest_map(unsigned long phys_addr, unsigned long pages);
void lguest_unmap(void *);
struct lguest_driver {
const char *name;
struct module *owner;
u16 device_type;
int (*probe)(struct lguest_device *dev);
void (*remove)(struct lguest_device *dev);
struct device_driver drv;
};
extern int register_lguest_driver(struct lguest_driver *drv);
extern void unregister_lguest_driver(struct lguest_driver *drv);
extern struct lguest_device_desc *lguest_devices; /* Just past max_pfn */
#endif /* _ASM_LGUEST_DEVICE_H */