diff options
Diffstat (limited to 'tools')
96 files changed, 6366 insertions, 2298 deletions
diff --git a/tools/lguest/.gitignore b/tools/lguest/.gitignore new file mode 100644 index 00000000000..115587fd5f6 --- /dev/null +++ b/tools/lguest/.gitignore @@ -0,0 +1 @@ +lguest diff --git a/tools/lguest/Makefile b/tools/lguest/Makefile new file mode 100644 index 00000000000..0ac34206f7a --- /dev/null +++ b/tools/lguest/Makefile @@ -0,0 +1,8 @@ +# This creates the demonstration utility "lguest" which runs a Linux guest. +# Missing headers? Add "-I../../../include -I../../../arch/x86/include" +CFLAGS:=-m32 -Wall -Wmissing-declarations -Wmissing-prototypes -O3 -U_FORTIFY_SOURCE + +all: lguest + +clean: + rm -f lguest diff --git a/tools/lguest/extract b/tools/lguest/extract new file mode 100644 index 00000000000..7730bb6e4b9 --- /dev/null +++ b/tools/lguest/extract @@ -0,0 +1,58 @@ +#! /bin/sh + +set -e + +PREFIX=$1 +shift + +trap 'rm -r $TMPDIR' 0 +TMPDIR=`mktemp -d` + +exec 3>/dev/null +for f; do + while IFS=" +" read -r LINE; do + case "$LINE" in + *$PREFIX:[0-9]*:\**) + NUM=`echo "$LINE" | sed "s/.*$PREFIX:\([0-9]*\).*/\1/"` + if [ -f $TMPDIR/$NUM ]; then + echo "$TMPDIR/$NUM already exits prior to $f" + exit 1 + fi + exec 3>>$TMPDIR/$NUM + echo $f | sed 's,\.\./,,g' > $TMPDIR/.$NUM + /bin/echo "$LINE" | sed -e "s/$PREFIX:[0-9]*//" -e "s/:\*/*/" >&3 + ;; + *$PREFIX:[0-9]*) + NUM=`echo "$LINE" | sed "s/.*$PREFIX:\([0-9]*\).*/\1/"` + if [ -f $TMPDIR/$NUM ]; then + echo "$TMPDIR/$NUM already exits prior to $f" + exit 1 + fi + exec 3>>$TMPDIR/$NUM + echo $f | sed 's,\.\./,,g' > $TMPDIR/.$NUM + /bin/echo "$LINE" | sed "s/$PREFIX:[0-9]*//" >&3 + ;; + *:\**) + /bin/echo "$LINE" | sed -e "s/:\*/*/" -e "s,/\*\*/,," >&3 + echo >&3 + exec 3>/dev/null + ;; + *) + /bin/echo "$LINE" >&3 + ;; + esac + done < $f + echo >&3 + exec 3>/dev/null +done + +LASTFILE="" +for f in $TMPDIR/*; do + if [ "$LASTFILE" != $(cat $TMPDIR/.$(basename $f) ) ]; then + LASTFILE=$(cat $TMPDIR/.$(basename $f) ) + echo "[ $LASTFILE ]" + fi + cat $f +done + diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c new file mode 100644 index 00000000000..f759f4f097c --- /dev/null +++ b/tools/lguest/lguest.c @@ -0,0 +1,2065 @@ +/*P:100 + * This is the Launcher code, a simple program which lays out the "physical" + * memory for the new Guest by mapping the kernel image and the virtual + * devices, then opens /dev/lguest to tell the kernel about the Guest and + * control it. +:*/ +#define _LARGEFILE64_SOURCE +#define _GNU_SOURCE +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <err.h> +#include <stdint.h> +#include <stdlib.h> +#include <elf.h> +#include <sys/mman.h> +#include <sys/param.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <sys/eventfd.h> +#include <fcntl.h> +#include <stdbool.h> +#include <errno.h> +#include <ctype.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <sys/time.h> +#include <time.h> +#include <netinet/in.h> +#include <net/if.h> +#include <linux/sockios.h> +#include <linux/if_tun.h> +#include <sys/uio.h> +#include <termios.h> +#include <getopt.h> +#include <assert.h> +#include <sched.h> +#include <limits.h> +#include <stddef.h> +#include <signal.h> +#include <pwd.h> +#include <grp.h> + +#include <linux/virtio_config.h> +#include <linux/virtio_net.h> +#include <linux/virtio_blk.h> +#include <linux/virtio_console.h> +#include <linux/virtio_rng.h> +#include <linux/virtio_ring.h> +#include <asm/bootparam.h> +#include "../../include/linux/lguest_launcher.h" +/*L:110 + * We can ignore the 43 include files we need for this program, but I do want + * to draw attention to the use of kernel-style types. + * + * As Linus said, "C is a Spartan language, and so should your naming be." I + * like these abbreviations, so we define them here. Note that u64 is always + * unsigned long long, which works on all Linux systems: this means that we can + * use %llu in printf for any u64. + */ +typedef unsigned long long u64; +typedef uint32_t u32; +typedef uint16_t u16; +typedef uint8_t u8; +/*:*/ + +#define BRIDGE_PFX "bridge:" +#ifndef SIOCBRADDIF +#define SIOCBRADDIF 0x89a2 /* add interface to bridge */ +#endif +/* We can have up to 256 pages for devices. */ +#define DEVICE_PAGES 256 +/* This will occupy 3 pages: it must be a power of 2. */ +#define VIRTQUEUE_NUM 256 + +/*L:120 + * verbose is both a global flag and a macro. The C preprocessor allows + * this, and although I wouldn't recommend it, it works quite nicely here. + */ +static bool verbose; +#define verbose(args...) \ + do { if (verbose) printf(args); } while(0) +/*:*/ + +/* The pointer to the start of guest memory. */ +static void *guest_base; +/* The maximum guest physical address allowed, and maximum possible. */ +static unsigned long guest_limit, guest_max; +/* The /dev/lguest file descriptor. */ +static int lguest_fd; + +/* a per-cpu variable indicating whose vcpu is currently running */ +static unsigned int __thread cpu_id; + +/* This is our list of devices. */ +struct device_list { + /* Counter to assign interrupt numbers. */ + unsigned int next_irq; + + /* Counter to print out convenient device numbers. */ + unsigned int device_num; + + /* The descriptor page for the devices. */ + u8 *descpage; + + /* A single linked list of devices. */ + struct device *dev; + /* And a pointer to the last device for easy append. */ + struct device *lastdev; +}; + +/* The list of Guest devices, based on command line arguments. */ +static struct device_list devices; + +/* The device structure describes a single device. */ +struct device { + /* The linked-list pointer. */ + struct device *next; + + /* The device's descriptor, as mapped into the Guest. */ + struct lguest_device_desc *desc; + + /* We can't trust desc values once Guest has booted: we use these. */ + unsigned int feature_len; + unsigned int num_vq; + + /* The name of this device, for --verbose. */ + const char *name; + + /* Any queues attached to this device */ + struct virtqueue *vq; + + /* Is it operational */ + bool running; + + /* Device-specific data. */ + void *priv; +}; + +/* The virtqueue structure describes a queue attached to a device. */ +struct virtqueue { + struct virtqueue *next; + + /* Which device owns me. */ + struct device *dev; + + /* The configuration for this queue. */ + struct lguest_vqconfig config; + + /* The actual ring of buffers. */ + struct vring vring; + + /* Last available index we saw. */ + u16 last_avail_idx; + + /* How many are used since we sent last irq? */ + unsigned int pending_used; + + /* Eventfd where Guest notifications arrive. */ + int eventfd; + + /* Function for the thread which is servicing this virtqueue. */ + void (*service)(struct virtqueue *vq); + pid_t thread; +}; + +/* Remember the arguments to the program so we can "reboot" */ +static char **main_args; + +/* The original tty settings to restore on exit. */ +static struct termios orig_term; + +/* + * We have to be careful with barriers: our devices are all run in separate + * threads and so we need to make sure that changes visible to the Guest happen + * in precise order. + */ +#define wmb() __asm__ __volatile__("" : : : "memory") +#define mb() __asm__ __volatile__("" : : : "memory") + +/* + * Convert an iovec element to the given type. + * + * This is a fairly ugly trick: we need to know the size of the type and + * alignment requirement to check the pointer is kosher. It's also nice to + * have the name of the type in case we report failure. + * + * Typing those three things all the time is cumbersome and error prone, so we + * have a macro which sets them all up and passes to the real function. + */ +#define convert(iov, type) \ + ((type *)_convert((iov), sizeof(type), __alignof__(type), #type)) + +static void *_convert(struct iovec *iov, size_ |