diff options
Diffstat (limited to 'drivers/lguest/lguest_user.c')
| -rw-r--r-- | drivers/lguest/lguest_user.c | 39 |
1 files changed, 5 insertions, 34 deletions
diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index 61b177e1e649..ee405b38383d 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -2,37 +2,12 @@ * controls and communicates with the Guest. For example, the first write will * tell us the Guest's memory layout, pagetable, entry point and kernel address * offset. A read will run the Guest until something happens, such as a signal - * or the Guest doing a DMA out to the Launcher. Writes are also used to get a - * DMA buffer registered by the Guest and to send the Guest an interrupt. :*/ + * or the Guest doing a NOTIFY out to the Launcher. :*/ #include <linux/uaccess.h> #include <linux/miscdevice.h> #include <linux/fs.h> #include "lg.h" -/*L:310 To send DMA into the Guest, the Launcher needs to be able to ask for a - * DMA buffer. This is done by writing LHREQ_GETDMA and the key to - * /dev/lguest. */ -static long user_get_dma(struct lguest *lg, const unsigned long __user *input) -{ - unsigned long key, udma, irq; - - /* Fetch the key they wrote to us. */ - if (get_user(key, input) != 0) - return -EFAULT; - /* Look for a free Guest DMA buffer bound to that key. */ - udma = get_dma_buffer(lg, key, &irq); - if (!udma) - return -ENOENT; - - /* We need to tell the Launcher what interrupt the Guest expects after - * the buffer is filled. We stash it in udma->used_len. */ - lgwrite_u32(lg, udma + offsetof(struct lguest_dma, used_len), irq); - - /* The (guest-physical) address of the DMA buffer is returned from - * the write(). */ - return udma; -} - /*L:315 To force the Guest to stop running and return to the Launcher, the * Waker sets writes LHREQ_BREAK and the value "1" to /dev/lguest. The * Launcher then writes LHREQ_BREAK and "0" to release the Waker. */ @@ -102,10 +77,10 @@ static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o) return len; } - /* If we returned from read() last time because the Guest sent DMA, + /* If we returned from read() last time because the Guest notified, * clear the flag. */ - if (lg->dma_is_pending) - lg->dma_is_pending = 0; + if (lg->pending_notify) + lg->pending_notify = 0; /* Run the Guest until something interesting happens. */ return run_guest(lg, (unsigned long __user *)user); @@ -216,7 +191,7 @@ unlock: /*L:010 The first operation the Launcher does must be a write. All writes * start with a 32 bit number: for the first write this must be * LHREQ_INITIALIZE to set up the Guest. After that the Launcher can use - * writes of other values to get DMA buffers and send interrupts. */ + * writes of other values to send interrupts. */ static ssize_t write(struct file *file, const char __user *in, size_t size, loff_t *off) { @@ -245,8 +220,6 @@ static ssize_t write(struct file *file, const char __user *in, switch (req) { case LHREQ_INITIALIZE: return initialize(file, input); - case LHREQ_GETDMA: - return user_get_dma(lg, input); case LHREQ_IRQ: return user_send_irq(lg, input); case LHREQ_BREAK: @@ -276,8 +249,6 @@ static int close(struct inode *inode, struct file *file) mutex_lock(&lguest_lock); /* Cancels the hrtimer set via LHCALL_SET_CLOCKEVENT. */ hrtimer_cancel(&lg->hrt); - /* Free any DMA buffers the Guest had bound. */ - release_all_dma(lg); /* Free up the shadow page tables for the Guest. */ free_guest_pagetable(lg); /* Now all the memory cleanups are done, it's safe to release the |