diff options
Diffstat (limited to 'drivers/lguest')
| -rw-r--r-- | drivers/lguest/core.c | 14 | ||||
| -rw-r--r-- | drivers/lguest/hypercalls.c | 4 | ||||
| -rw-r--r-- | drivers/lguest/io.c | 10 | ||||
| -rw-r--r-- | drivers/lguest/lg.h | 5 | ||||
| -rw-r--r-- | drivers/lguest/lguest_user.c | 17 |
5 files changed, 13 insertions, 37 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index eb95860..ca581ef 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -47,10 +47,6 @@ static struct { DEFINE_MUTEX(lguest_lock); static DEFINE_PER_CPU(struct lguest *, last_guest); -/* FIXME: Make dynamic. */ -#define MAX_LGUEST_GUESTS 16 -struct lguest lguests[MAX_LGUEST_GUESTS]; - /* Offset from where switcher.S was compiled to where we've copied it */ static unsigned long switcher_offset(void) { @@ -660,16 +656,6 @@ int run_guest(struct lguest *lg, unsigned long __user *user) * deliver_trap() and demand_page(). After all those, we'll be ready to * examine the Switcher, and our philosophical understanding of the Host/Guest * duality will be complete. :*/ - -int find_free_guest(void) -{ - unsigned int i; - for (i = 0; i < MAX_LGUEST_GUESTS; i++) - if (!lguests[i].tsk) - return i; - return -1; -} - static void adjust_pge(void *on) { if (on) diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 02e67b4..8bde209 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -225,9 +225,7 @@ static void initialize(struct lguest *lg) /* We tell the Guest that it can't use the top 4MB of virtual * addresses used by the Switcher. */ || put_user(4U*1024*1024, &lg->lguest_data->reserve_mem) - || put_user(tsc_speed, &lg->lguest_data->tsc_khz) - /* We also give the Guest a unique id, as used in lguest_net.c. */ - || put_user(lg->guestid, &lg->lguest_data->guestid)) + || put_user(tsc_speed, &lg->lguest_data->tsc_khz)) kill_guest(lg, "bad guest page %p", lg->lguest_data); /* We write the current time into the Guest's data page once now. */ diff --git a/drivers/lguest/io.c b/drivers/lguest/io.c index 3a84533..0e842e9 100644 --- a/drivers/lguest/io.c +++ b/drivers/lguest/io.c @@ -212,7 +212,7 @@ int bind_dma(struct lguest *lg, lg->dma[i].num_dmas = numdmas; lg->dma[i].next_dma = 0; lg->dma[i].key = key; - lg->dma[i].guestid = lg->guestid; + lg->dma[i].owner = lg; lg->dma[i].interrupt = interrupt; /* Now we add it to the hash table: the position @@ -412,7 +412,7 @@ static int dma_transfer(struct lguest *srclg, /* From the "struct lguest_dma_info" we found in the hash, grab the * Guest. */ - dstlg = &lguests[dst->guestid]; + dstlg = dst->owner; /* Read in the source "struct lguest_dma" handed to SEND_DMA. */ lgread(srclg, &src_dma, udma, sizeof(src_dma)); @@ -506,8 +506,8 @@ again: struct lguest_dma_info *i; /* Look through the hash for other Guests. */ list_for_each_entry(i, &dma_hash[hash(&key)], list) { - /* Don't send to ourselves. */ - if (i->guestid == lg->guestid) + /* Don't send to ourselves (would deadlock). */ + if (i->owner->mm == lg->mm) continue; if (!key_eq(&key, &i->key)) continue; @@ -594,7 +594,7 @@ unsigned long get_dma_buffer(struct lguest *lg, * send to its own Guest for the moment, so the entry must be for this * Guest) */ list_for_each_entry(i, &dma_hash[hash(&key)], list) { - if (key_eq(&key, &i->key) && i->guestid == lg->guestid) { + if (key_eq(&key, &i->key) && i->owner == lg) { unsigned int j; /* Look through the registered DMA array for an * available buffer. */ diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 54f2c24..c9d1dc2 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -51,9 +51,9 @@ struct lguest_dma_info struct list_head list; union futex_key key; unsigned long dmas; + struct lguest *owner; u16 next_dma; u16 num_dmas; - u16 guestid; u8 interrupt; /* 0 when not registered */ }; @@ -140,7 +140,6 @@ struct lguest struct lguest_data __user *lguest_data; struct task_struct *tsk; struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ - u16 guestid; u32 pfn_limit; /* This provides the offset to the base of guest-physical * memory in the Launcher. */ @@ -195,7 +194,6 @@ struct lguest DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); }; -extern struct lguest lguests[]; extern struct mutex lguest_lock; /* core.c: */ @@ -203,7 +201,6 @@ u32 lgread_u32(struct lguest *lg, unsigned long addr); void lgwrite_u32(struct lguest *lg, unsigned long addr, u32 val); void lgread(struct lguest *lg, void *buf, unsigned long addr, unsigned len); void lgwrite(struct lguest *lg, unsigned long, const void *buf, unsigned len); -int find_free_guest(void); int lguest_address_ok(const struct lguest *lg, unsigned long addr, unsigned long len); int run_guest(struct lguest *lg, unsigned long __user *user); diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index 816d4d1..5632ed8 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -167,11 +167,11 @@ static int initialize(struct file *file, const u32 __user *input) /* "struct lguest" contains everything we (the Host) know about a * Guest. */ struct lguest *lg; - int err, i; + int err; u32 args[5]; - /* We grab the Big Lguest lock, which protects the global array - * "lguests" and multiple simultaneous initializations. */ + /* We grab the Big Lguest lock, which protects against multiple + * simultaneous initializations. */ mutex_lock(&lguest_lock); /* You can't initialize twice! Close the device and start again... */ if (file->private_data) { @@ -184,18 +184,13 @@ static int initialize(struct file *file, const u32 __user *input) goto unlock; } - /* Find an unused guest. */ - i = find_free_guest(); - if (i < 0) { - err = -ENOSPC; + lg = kzalloc(sizeof(*lg), GFP_KERNEL); + if (!lg) { + err = -ENOMEM; goto unlock; } - /* OK, we have an index into the "lguest" array: "lg" is a convenient - * pointer. */ - lg = &lguests[i]; /* Populate the easy fields of our "struct lguest" */ - lg->guestid = i; lg->mem_base = (void __user *)(long)args[0]; lg->pfn_limit = args[1]; lg->page_offset = args[4]; |
