Displaying 20 results from an estimated 263 matches for "put_us".
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put_user
2010 Oct 28
1
[PATCH] xen: xenfs: privcmd: check put_user() return code
put_user() may fail. In this case propagate error code from
privcmd_ioctl_mmap_batch().
Signed-off-by: Vasiliy Kulikov <segooon at gmail.com>
---
Compile tested.
drivers/xen/xenfs/privcmd.c | 8 ++------
1 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/xen/xenfs/privcmd...
2010 Oct 28
1
[PATCH] xen: xenfs: privcmd: check put_user() return code
put_user() may fail. In this case propagate error code from
privcmd_ioctl_mmap_batch().
Signed-off-by: Vasiliy Kulikov <segooon at gmail.com>
---
Compile tested.
drivers/xen/xenfs/privcmd.c | 8 ++------
1 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/xen/xenfs/privcmd...
2015 Jan 14
1
[PULL] uaccess: fix sparse warning on get/put_user for bitwise types
...rnel/git/mst/vhost.git tags/uaccess_for_upstream
for you to fetch changes up to 0795cb1b46e7938ed679ccd48f933e75272b30e3:
sparc32: nocheck uaccess coding style tweaks (2015-01-13 15:24:14 +0200)
----------------------------------------------------------------
uaccess: fix sparse warning on get/put_user for bitwise types
At the moment, if p and x are both tagged as bitwise types,
some of get_user(x, p), put_user(x, p), __get_user(x, p), __put_user(x, p)
might produce a sparse warning on many architectures.
This is a false positive: *p on these architectures is loaded into long
(typically using...
2015 Jan 14
1
[PULL] uaccess: fix sparse warning on get/put_user for bitwise types
...rnel/git/mst/vhost.git tags/uaccess_for_upstream
for you to fetch changes up to 0795cb1b46e7938ed679ccd48f933e75272b30e3:
sparc32: nocheck uaccess coding style tweaks (2015-01-13 15:24:14 +0200)
----------------------------------------------------------------
uaccess: fix sparse warning on get/put_user for bitwise types
At the moment, if p and x are both tagged as bitwise types,
some of get_user(x, p), put_user(x, p), __get_user(x, p), __put_user(x, p)
might produce a sparse warning on many architectures.
This is a false positive: *p on these architectures is loaded into long
(typically using...
2007 May 04
1
[PATCH 1/3] Documentation and example updates
1) Example code: old libc headers don't have SIOCBRADDIF, and old zlibs
don't have gzdirect() -- it's a sanity check anyway.
2) Some people don't build in their source directories, so .config
isn't there (thanks to Tony Breeds <tony@bakeyournoodle.com>).
3) Point out that guest and host kernel are usually the same.
4) Set the "no checksum" option on the
2007 May 04
1
[PATCH 1/3] Documentation and example updates
1) Example code: old libc headers don't have SIOCBRADDIF, and old zlibs
don't have gzdirect() -- it's a sanity check anyway.
2) Some people don't build in their source directories, so .config
isn't there (thanks to Tony Breeds <tony@bakeyournoodle.com>).
3) Point out that guest and host kernel are usually the same.
4) Set the "no checksum" option on the
2019 May 13
5
[PATCH net] vhost: don't use kmap() to log dirty pages
...p using userspace virtual
address. Fortunately, futex has arch_futex_atomic_op_inuser() which
could be used for setting a bit to user.
Note there're several cases that futex helper can fail e.g a page
fault or the arch that doesn't have the support. For those cases, a
simplified get_user()/put_user() pair protected by a global mutex is
provided as a fallback. The fallback may lead false positive that
userspace may see more dirty pages.
Cc: Christoph Hellwig <hch at infradead.org>
Cc: James Bottomley <James.Bottomley at HansenPartnership.com>
Cc: Andrea Arcangeli <aarcange at...
2019 May 13
5
[PATCH net] vhost: don't use kmap() to log dirty pages
...p using userspace virtual
address. Fortunately, futex has arch_futex_atomic_op_inuser() which
could be used for setting a bit to user.
Note there're several cases that futex helper can fail e.g a page
fault or the arch that doesn't have the support. For those cases, a
simplified get_user()/put_user() pair protected by a global mutex is
provided as a fallback. The fallback may lead false positive that
userspace may see more dirty pages.
Cc: Christoph Hellwig <hch at infradead.org>
Cc: James Bottomley <James.Bottomley at HansenPartnership.com>
Cc: Andrea Arcangeli <aarcange at...
2011 Jun 21
1
[PATCH 1/2] vhost: init used ring after backend was set
...ost.c
+++ b/drivers/vhost/vhost.c
@@ -578,15 +578,14 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return 0;
}
-static int init_used(struct vhost_virtqueue *vq,
- struct vring_used __user *used)
+int init_used(struct vhost_virtqueue *vq)
{
- int r = put_user(vq->used_flags, &used->flags);
+ int r = put_user(vq->used_flags, &vq->used->flags);
if (r)
return r;
vq->signalled_used_valid = false;
- return get_user(vq->last_used_idx, &used->idx);
+ return get_user(vq->last_used_idx, &vq->used->idx);...
2011 Jun 21
1
[PATCH 1/2] vhost: init used ring after backend was set
...ost.c
+++ b/drivers/vhost/vhost.c
@@ -578,15 +578,14 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return 0;
}
-static int init_used(struct vhost_virtqueue *vq,
- struct vring_used __user *used)
+int init_used(struct vhost_virtqueue *vq)
{
- int r = put_user(vq->used_flags, &used->flags);
+ int r = put_user(vq->used_flags, &vq->used->flags);
if (r)
return r;
vq->signalled_used_valid = false;
- return get_user(vq->last_used_idx, &used->idx);
+ return get_user(vq->last_used_idx, &vq->used->idx);...
2011 Jun 16
1
[PATCH] vhost: set dirty log when updating flags of used ring
.../vhost.c
index 2ab2912..7c46aed 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -573,8 +573,10 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
static int init_used(struct vhost_virtqueue *vq,
struct vring_used __user *used)
{
- int r = put_user(vq->used_flags, &used->flags);
+ int r;
+ vq->used = used;
+ r = vhost_update_used_flags(vq);
if (r)
return r;
return get_user(vq->last_used_idx, &used->idx);
@@ -700,7 +702,6 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
vq-&...
2011 Jun 16
1
[PATCH] vhost: set dirty log when updating flags of used ring
.../vhost.c
index 2ab2912..7c46aed 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -573,8 +573,10 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
static int init_used(struct vhost_virtqueue *vq,
struct vring_used __user *used)
{
- int r = put_user(vq->used_flags, &used->flags);
+ int r;
+ vq->used = used;
+ r = vhost_update_used_flags(vq);
if (r)
return r;
return get_user(vq->last_used_idx, &used->idx);
@@ -700,7 +702,6 @@ static long vhost_set_vring(struct vhost_dev *d, int ioctl, void __user *argp)
vq-&...
2007 Apr 18
1
[rfc][patch][linux] ioctl32() compat plumbing for xen calls
...ed long arg)
+{
+ int ret;
+
+ switch (cmd) {
+ case IOCTL_PRIVCMD_MMAP_32: {
+ struct privcmd_mmap *p;
+ struct privcmd_mmap_32 *p32;
+ struct privcmd_mmap_32 n32;
+
+ p32 = compat_ptr(arg);
+ p = compat_alloc_user_space(sizeof(*p));
+ if (copy_from_user(&n32, p32, sizeof(n32)) ||
+ put_user(n32.num, &p->num) ||
+ put_user(n32.dom, &p->dom) ||
+ put_user(compat_ptr(n32.entry), &p->entry))
+ return -EFAULT;
+
+ ret = sys_ioctl(fd, IOCTL_PRIVCMD_MMAP, (unsigned long)p);
+ }
+ break;
+ case IOCTL_PRIVCMD_MMAPBATCH_32: {
+ struct privcmd_mmapbatch *p...
2019 May 07
4
[PATCH RFC] vhost: don't use kmap() to log dirty pages
...arch that has virtually tagged
caches. The way to fix is to keep using userspace virtual address.
Fortunately, futex has a cmpxchg to userspace memory helper
futex_atomic_cmpxchg_inatomic(). So switch to use it to exchange the
userspace bitmap with zero, set the bit and then write it back through
put_user().
Note: there're archs (few non popular ones) that don't implement
futex helper, we can't log dirty pages. We can fix them on top or
simply disable LOG_ALL features of vhost.
Cc: Christoph Hellwig <hch at infradead.org>
Cc: James Bottomley <James.Bottomley at HansenPartner...
2019 May 07
4
[PATCH RFC] vhost: don't use kmap() to log dirty pages
...arch that has virtually tagged
caches. The way to fix is to keep using userspace virtual address.
Fortunately, futex has a cmpxchg to userspace memory helper
futex_atomic_cmpxchg_inatomic(). So switch to use it to exchange the
userspace bitmap with zero, set the bit and then write it back through
put_user().
Note: there're archs (few non popular ones) that don't implement
futex helper, we can't log dirty pages. We can fix them on top or
simply disable LOG_ALL features of vhost.
Cc: Christoph Hellwig <hch at infradead.org>
Cc: James Bottomley <James.Bottomley at HansenPartner...
2010 Mar 03
1
[RFC][ PATCH 1/3] vhost-net: support multiple buffer heads in receiver
...t iovec *heads, int
count)
{
struct vring_used_elem *used;
+ int i;
- /* The virtqueue contains a ring of used buffers. Get a pointer
to the
- * next entry in that used ring. */
- used = &vq->used->ring[vq->last_used_idx % vq->num];
- if (put_user(head, &used->id)) {
- vq_err(vq, "Failed to write used id");
- return -EFAULT;
- }
- if (put_user(len, &used->len)) {
- vq_err(vq, "Failed to write used len");
- return -EFAULT;
+ for (i=0;...
2010 Mar 03
1
[RFC][ PATCH 1/3] vhost-net: support multiple buffer heads in receiver
...t iovec *heads, int
count)
{
struct vring_used_elem *used;
+ int i;
- /* The virtqueue contains a ring of used buffers. Get a pointer
to the
- * next entry in that used ring. */
- used = &vq->used->ring[vq->last_used_idx % vq->num];
- if (put_user(head, &used->id)) {
- vq_err(vq, "Failed to write used id");
- return -EFAULT;
- }
- if (put_user(len, &used->len)) {
- vq_err(vq, "Failed to write used len");
- return -EFAULT;
+ for (i=0;...
2009 Jan 24
5
[LLVMdev] inline asm semantics: output constraint width smaller than input
...6,7 +176,7 @@ extern int __get_user_bad(void);
break; \
} \
(x) = (__typeof__(*(ptr)))__val_gu; \
- __ret_gu; \
+ (int)__ret_gu; \
})
#define __put_user_x(size, x, ptr, __ret_pu) \
@@ -239,11 +239,13 @@ extern void __put_user_8(void);
*/
#define put_user(x, ptr) \
({ \
- int __ret_pu; \
+ __typeof__(*(ptr)) __ret_pu; \
__typeof__(*(pt...
2014 Dec 01
0
[PATCH v8 32/50] vhost: switch to __get/__put_user exclusively
Most places in vhost can use __get/__put_user rather than
get/put_user since addresses are pre-validated.
This should be good for performance, but this also
will help make code sparse-clean: get/put_user macros
don't play well with __virtioXX bitwise tags.
Switch to get/put_user to __ variants everywhere in vhost.
There's one excepti...
2014 Dec 01
0
[PATCH v8 32/50] vhost: switch to __get/__put_user exclusively
Most places in vhost can use __get/__put_user rather than
get/put_user since addresses are pre-validated.
This should be good for performance, but this also
will help make code sparse-clean: get/put_user macros
don't play well with __virtioXX bitwise tags.
Switch to get/put_user to __ variants everywhere in vhost.
There's one excepti...