diff options
Diffstat (limited to 'Documentation/lguest/lguest.c')
| -rw-r--r-- | Documentation/lguest/lguest.c | 84 |
1 files changed, 34 insertions, 50 deletions
diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c index 1432b502a2d9..62a8133393e1 100644 --- a/Documentation/lguest/lguest.c +++ b/Documentation/lguest/lguest.c @@ -47,12 +47,14 @@ static bool verbose; #define verbose(args...) \ do { if (verbose) printf(args); } while(0) static int waker_fd; +static u32 top; struct device_list { fd_set infds; int max_infd; + struct lguest_device_desc *descs; struct device *dev; struct device **lastdev; }; @@ -324,8 +326,7 @@ static void concat(char *dst, char *args[]) static int tell_kernel(u32 pgdir, u32 start, u32 page_offset) { u32 args[] = { LHREQ_INITIALIZE, - LGUEST_GUEST_TOP/getpagesize(), /* Just below us */ - pgdir, start, page_offset }; + top/getpagesize(), pgdir, start, page_offset }; int fd; fd = open_or_die("/dev/lguest", O_RDWR); @@ -382,7 +383,7 @@ static int setup_waker(int lguest_fd, struct device_list *device_list) static void *_check_pointer(unsigned long addr, unsigned int size, unsigned int line) { - if (addr >= LGUEST_GUEST_TOP || addr + size >= LGUEST_GUEST_TOP) + if (addr >= top || addr + size >= top) errx(1, "%s:%i: Invalid address %li", __FILE__, line, addr); return (void *)addr; } @@ -629,24 +630,26 @@ static void handle_input(int fd, struct device_list *devices) } } -static struct lguest_device_desc *new_dev_desc(u16 type, u16 features, - u16 num_pages) +static struct lguest_device_desc * +new_dev_desc(struct lguest_device_desc *descs, + u16 type, u16 features, u16 num_pages) { - static unsigned long top = LGUEST_GUEST_TOP; - struct lguest_device_desc *desc; + unsigned int i; - desc = malloc(sizeof(*desc)); - desc->type = type; - desc->num_pages = num_pages; - desc->features = features; - desc->status = 0; - if (num_pages) { - top -= num_pages*getpagesize(); - map_zeroed_pages(top, num_pages); - desc->pfn = top / getpagesize(); - } else - desc->pfn = 0; - return desc; + for (i = 0; i < LGUEST_MAX_DEVICES; i++) { + if (!descs[i].type) { + descs[i].type = type; + descs[i].features = features; + descs[i].num_pages = num_pages; + if (num_pages) { + map_zeroed_pages(top, num_pages); + descs[i].pfn = top/getpagesize(); + top += num_pages*getpagesize(); + } + return &descs[i]; + } + } + errx(1, "too many devices"); } static struct device *new_device(struct device_list *devices, @@ -669,7 +672,7 @@ static struct device *new_device(struct device_list *devices, dev->fd = fd; if (handle_input) set_fd(dev->fd, devices); - dev->desc = new_dev_desc(type, features, num_pages); + dev->desc = new_dev_desc(devices->descs, type, features, num_pages); dev->mem = (void *)(dev->desc->pfn * getpagesize()); dev->handle_input = handle_input; dev->watch_key = (unsigned long)dev->mem + watch_off; @@ -866,30 +869,6 @@ static void setup_tun_net(const char *arg, struct device_list *devices) verbose("attached to bridge: %s\n", br_name); } -/* Now we know how much memory we have, we copy in device descriptors */ -static void map_device_descriptors(struct device_list *devs, unsigned long mem) -{ - struct device *i; - unsigned int num; - struct lguest_device_desc *descs; - - /* Device descriptor array sits just above top of normal memory */ - descs = map_zeroed_pages(mem, 1); - - for (i = devs->dev, num = 0; i; i = i->next, num++) { - if (num == LGUEST_MAX_DEVICES) - errx(1, "too many devices"); - verbose("Device %i: %s\n", num, - i->desc->type == LGUEST_DEVICE_T_NET ? "net" - : i->desc->type == LGUEST_DEVICE_T_CONSOLE ? "console" - : i->desc->type == LGUEST_DEVICE_T_BLOCK ? "block" - : "unknown"); - descs[num] = *i->desc; - free(i->desc); - i->desc = &descs[num]; - } -} - static void __attribute__((noreturn)) run_guest(int lguest_fd, struct device_list *device_list) { @@ -934,8 +913,8 @@ static void usage(void) int main(int argc, char *argv[]) { - unsigned long mem, pgdir, start, page_offset, initrd_size = 0; - int c, lguest_fd; + unsigned long mem = 0, pgdir, start, page_offset, initrd_size = 0; + int i, c, lguest_fd; struct device_list device_list; void *boot = (void *)0; const char *initrd_name = NULL; @@ -945,6 +924,15 @@ int main(int argc, char *argv[]) device_list.lastdev = &device_list.dev; FD_ZERO(&device_list.infds); + /* We need to know how much memory so we can allocate devices. */ + for (i = 1; i < argc; i++) { + if (argv[i][0] != '-') { + mem = top = atoi(argv[i]) * 1024 * 1024; + device_list.descs = map_zeroed_pages(top, 1); + top += getpagesize(); + break; + } + } while ((c = getopt_long(argc, argv, "v", opts, NULL)) != EOF) { switch (c) { case 'v': @@ -974,16 +962,12 @@ int main(int argc, char *argv[]) setup_console(&device_list); /* First we map /dev/zero over all of guest-physical memory. */ - mem = atoi(argv[optind]) * 1024 * 1024; map_zeroed_pages(0, mem / getpagesize()); /* Now we load the kernel */ start = load_kernel(open_or_die(argv[optind+1], O_RDONLY), &page_offset); - /* Write the device descriptors into memory. */ - map_device_descriptors(&device_list, mem); - /* Map the initrd image if requested */ if (initrd_name) { initrd_size = load_initrd(initrd_name, mem); |