~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/linux/lguest_launcher.h

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp