drivers/vhost/vhost.c:937:16: sparse: sparse: restricted __virtio16 degrades to integer
From: kernel test robot
Date: Wed Aug 05 2020 - 03:50:40 EST
Hi Jason,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4da9f3302615f4191814f826054846bf843e24fa
commit: 20c384f1ea1a0bc7320bc445c72dd02d2970d594 vhost: refine vhost and vringh kconfig
date: 4 months ago
config: riscv-randconfig-s032-20200805 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.2-117-g8c7aee71-dirty
git checkout 20c384f1ea1a0bc7320bc445c72dd02d2970d594
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=riscv
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
sparse warnings: (new ones prefixed by >>)
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
>> drivers/vhost/vhost.c:937:16: sparse: sparse: restricted __virtio16 degrades to integer
>> drivers/vhost/vhost.c:937:16: sparse: sparse: restricted __virtio16 degrades to integer
>> drivers/vhost/vhost.c:937:16: sparse: sparse: cast from restricted __virtio16
drivers/vhost/vhost.c:937:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asn:1> * @@
drivers/vhost/vhost.c:937:16: sparse: expected void *addr
drivers/vhost/vhost.c:937:16: sparse: got restricted __virtio16 [noderef] <asn:1> *
>> drivers/vhost/vhost.c:937:16: sparse: sparse: restricted __virtio16 degrades to integer
>> drivers/vhost/vhost.c:937:16: sparse: sparse: restricted __virtio16 degrades to integer
>> drivers/vhost/vhost.c:937:16: sparse: sparse: cast from restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:922:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:922:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:922:16: sparse: sparse: cast from restricted __virtio16
drivers/vhost/vhost.c:922:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] [usertype] <asn:1> * @@
drivers/vhost/vhost.c:922:16: sparse: expected void *addr
drivers/vhost/vhost.c:922:16: sparse: got restricted __virtio16 [noderef] [usertype] <asn:1> *
drivers/vhost/vhost.c:922:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:922:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:922:16: sparse: sparse: cast from restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:1014:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1014:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1014:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:1014:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asn:1> * @@
drivers/vhost/vhost.c:1014:16: sparse: expected void *addr
drivers/vhost/vhost.c:1014:16: sparse: got restricted __virtio16 [noderef] <asn:1> *
drivers/vhost/vhost.c:1014:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1014:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1014:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:989:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:989:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:989:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asn:1> * @@
drivers/vhost/vhost.c:989:16: sparse: expected void *addr
drivers/vhost/vhost.c:989:16: sparse: got restricted __virtio16 [noderef] <asn:1> *
drivers/vhost/vhost.c:989:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:989:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:989:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:995:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:995:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:995:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:995:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asn:1> * @@
drivers/vhost/vhost.c:995:16: sparse: expected void *addr
drivers/vhost/vhost.c:995:16: sparse: got restricted __virtio16 [noderef] <asn:1> *
drivers/vhost/vhost.c:995:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:995:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:995:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:944:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:944:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:944:16: sparse: sparse: cast from restricted __virtio16
drivers/vhost/vhost.c:944:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asn:1> * @@
drivers/vhost/vhost.c:944:16: sparse: expected void *addr
drivers/vhost/vhost.c:944:16: sparse: got restricted __virtio16 [noderef] <asn:1> *
drivers/vhost/vhost.c:944:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:944:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:944:16: sparse: sparse: cast from restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:1002:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1002:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1002:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:1002:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] <asn:1> * @@
drivers/vhost/vhost.c:1002:16: sparse: expected void *addr
drivers/vhost/vhost.c:1002:16: sparse: got restricted __virtio16 [noderef] <asn:1> *
drivers/vhost/vhost.c:1002:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1002:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1002:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:900:42: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void [noderef] <asn:1> *addr @@ got void *addr @@
drivers/vhost/vhost.c:900:42: sparse: expected void [noderef] <asn:1> *addr
drivers/vhost/vhost.c:900:42: sparse: got void *addr
drivers/vhost/vhost.c:753:17: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] <asn:1> * @@ got void * @@
drivers/vhost/vhost.c:753:17: sparse: expected void [noderef] <asn:1> *
drivers/vhost/vhost.c:753:17: sparse: got void *
drivers/vhost/vhost.c:1008:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1008:16: sparse: sparse: restricted __virtio16 degrades to integer
drivers/vhost/vhost.c:1008:16: sparse: sparse: cast to restricted __virtio16
drivers/vhost/vhost.c:1008:16: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void *addr @@ got restricted __virtio16 [noderef] [usertype] <asn:1> * @@
vim +937 drivers/vhost/vhost.c
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 743
f889491380582b4 Jason Wang 2017-02-28 744 static inline void __user *vhost_vq_meta_fetch(struct vhost_virtqueue *vq,
f889491380582b4 Jason Wang 2017-02-28 745 u64 addr, unsigned int size,
f889491380582b4 Jason Wang 2017-02-28 746 int type)
f889491380582b4 Jason Wang 2017-02-28 747 {
f889491380582b4 Jason Wang 2017-02-28 748 const struct vhost_umem_node *node = vq->meta_iotlb[type];
f889491380582b4 Jason Wang 2017-02-28 749
f889491380582b4 Jason Wang 2017-02-28 750 if (!node)
f889491380582b4 Jason Wang 2017-02-28 751 return NULL;
f889491380582b4 Jason Wang 2017-02-28 752
f889491380582b4 Jason Wang 2017-02-28 @753 return (void *)(uintptr_t)(node->userspace_addr + addr - node->start);
f889491380582b4 Jason Wang 2017-02-28 754 }
f889491380582b4 Jason Wang 2017-02-28 755
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 756 /* Can we switch to this memory table? */
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 757 /* Caller should have device mutex but not vq mutex */
ddd3d4081ffa806 Stefan Hajnoczi 2018-04-11 758 static bool memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 759 int log_all)
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 760 {
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 761 int i;
d47effe1be0c4fc Krishna Kumar 2011-03-01 762
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 763 for (i = 0; i < d->nvqs; ++i) {
ddd3d4081ffa806 Stefan Hajnoczi 2018-04-11 764 bool ok;
ea16c51433510f7 Michael S. Tsirkin 2014-06-05 765 bool log;
ea16c51433510f7 Michael S. Tsirkin 2014-06-05 766
3ab2e420ec1caf4 Asias He 2013-04-27 767 mutex_lock(&d->vqs[i]->mutex);
ea16c51433510f7 Michael S. Tsirkin 2014-06-05 768 log = log_all || vhost_has_feature(d->vqs[i], VHOST_F_LOG_ALL);
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 769 /* If ring is inactive, will check when it's enabled. */
3ab2e420ec1caf4 Asias He 2013-04-27 770 if (d->vqs[i]->private_data)
a9709d6874d5513 Jason Wang 2016-06-23 771 ok = vq_memory_access_ok(d->vqs[i]->log_base,
a9709d6874d5513 Jason Wang 2016-06-23 772 umem, log);
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 773 else
ddd3d4081ffa806 Stefan Hajnoczi 2018-04-11 774 ok = true;
3ab2e420ec1caf4 Asias He 2013-04-27 775 mutex_unlock(&d->vqs[i]->mutex);
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 776 if (!ok)
ddd3d4081ffa806 Stefan Hajnoczi 2018-04-11 777 return false;
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 778 }
ddd3d4081ffa806 Stefan Hajnoczi 2018-04-11 779 return true;
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 780 }
3a4d5c94e959359 Michael S. Tsirkin 2010-01-14 781
6b1e6cc7855b09a Jason Wang 2016-06-23 782 static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
6b1e6cc7855b09a Jason Wang 2016-06-23 783 struct iovec iov[], int iov_size, int access);
bfe2bc512884d0b Jason Wang 2016-06-23 784
72952cc0614b616 Michael S. Tsirkin 2016-12-06 785 static int vhost_copy_to_user(struct vhost_virtqueue *vq, void __user *to,
bfe2bc512884d0b Jason Wang 2016-06-23 786 const void *from, unsigned size)
bfe2bc512884d0b Jason Wang 2016-06-23 787 {
6b1e6cc7855b09a Jason Wang 2016-06-23 788 int ret;
6b1e6cc7855b09a Jason Wang 2016-06-23 789
6b1e6cc7855b09a Jason Wang 2016-06-23 790 if (!vq->iotlb)
bfe2bc512884d0b Jason Wang 2016-06-23 791 return __copy_to_user(to, from, size);
6b1e6cc7855b09a Jason Wang 2016-06-23 792 else {
6b1e6cc7855b09a Jason Wang 2016-06-23 793 /* This function should be called after iotlb
6b1e6cc7855b09a Jason Wang 2016-06-23 794 * prefetch, which means we're sure that all vq
6b1e6cc7855b09a Jason Wang 2016-06-23 795 * could be access through iotlb. So -EAGAIN should
6b1e6cc7855b09a Jason Wang 2016-06-23 796 * not happen in this case.
6b1e6cc7855b09a Jason Wang 2016-06-23 797 */
6b1e6cc7855b09a Jason Wang 2016-06-23 798 struct iov_iter t;
f889491380582b4 Jason Wang 2017-02-28 799 void __user *uaddr = vhost_vq_meta_fetch(vq,
f889491380582b4 Jason Wang 2017-02-28 800 (u64)(uintptr_t)to, size,
7ced6c98c7ab7a1 Eric Auger 2018-04-11 801 VHOST_ADDR_USED);
f889491380582b4 Jason Wang 2017-02-28 802
f889491380582b4 Jason Wang 2017-02-28 803 if (uaddr)
f889491380582b4 Jason Wang 2017-02-28 804 return __copy_to_user(uaddr, from, size);
f889491380582b4 Jason Wang 2017-02-28 805
6b1e6cc7855b09a Jason Wang 2016-06-23 806 ret = translate_desc(vq, (u64)(uintptr_t)to, size, vq->iotlb_iov,
6b1e6cc7855b09a Jason Wang 2016-06-23 807 ARRAY_SIZE(vq->iotlb_iov),
6b1e6cc7855b09a Jason Wang 2016-06-23 808 VHOST_ACCESS_WO);
6b1e6cc7855b09a Jason Wang 2016-06-23 809 if (ret < 0)
6b1e6cc7855b09a Jason Wang 2016-06-23 810 goto out;
6b1e6cc7855b09a Jason Wang 2016-06-23 811 iov_iter_init(&t, WRITE, vq->iotlb_iov, ret, size);
6b1e6cc7855b09a Jason Wang 2016-06-23 812 ret = copy_to_iter(from, size, &t);
6b1e6cc7855b09a Jason Wang 2016-06-23 813 if (ret == size)
6b1e6cc7855b09a Jason Wang 2016-06-23 814 ret = 0;
6b1e6cc7855b09a Jason Wang 2016-06-23 815 }
6b1e6cc7855b09a Jason Wang 2016-06-23 816 out:
6b1e6cc7855b09a Jason Wang 2016-06-23 817 return ret;
bfe2bc512884d0b Jason Wang 2016-06-23 818 }
bfe2bc512884d0b Jason Wang 2016-06-23 819
bfe2bc512884d0b Jason Wang 2016-06-23 820 static int vhost_copy_from_user(struct vhost_virtqueue *vq, void *to,
72952cc0614b616 Michael S. Tsirkin 2016-12-06 821 void __user *from, unsigned size)
bfe2bc512884d0b Jason Wang 2016-06-23 822 {
6b1e6cc7855b09a Jason Wang 2016-06-23 823 int ret;
6b1e6cc7855b09a Jason Wang 2016-06-23 824
6b1e6cc7855b09a Jason Wang 2016-06-23 825 if (!vq->iotlb)
bfe2bc512884d0b Jason Wang 2016-06-23 826 return __copy_from_user(to, from, size);
6b1e6cc7855b09a Jason Wang 2016-06-23 827 else {
6b1e6cc7855b09a Jason Wang 2016-06-23 828 /* This function should be called after iotlb
6b1e6cc7855b09a Jason Wang 2016-06-23 829 * prefetch, which means we're sure that vq
6b1e6cc7855b09a Jason Wang 2016-06-23 830 * could be access through iotlb. So -EAGAIN should
6b1e6cc7855b09a Jason Wang 2016-06-23 831 * not happen in this case.
6b1e6cc7855b09a Jason Wang 2016-06-23 832 */
f889491380582b4 Jason Wang 2017-02-28 833 void __user *uaddr = vhost_vq_meta_fetch(vq,
f889491380582b4 Jason Wang 2017-02-28 834 (u64)(uintptr_t)from, size,
f889491380582b4 Jason Wang 2017-02-28 835 VHOST_ADDR_DESC);
6b1e6cc7855b09a Jason Wang 2016-06-23 836 struct iov_iter f;
f889491380582b4 Jason Wang 2017-02-28 837
f889491380582b4 Jason Wang 2017-02-28 838 if (uaddr)
f889491380582b4 Jason Wang 2017-02-28 839 return __copy_from_user(to, uaddr, size);
f889491380582b4 Jason Wang 2017-02-28 840
6b1e6cc7855b09a Jason Wang 2016-06-23 841 ret = translate_desc(vq, (u64)(uintptr_t)from, size, vq->iotlb_iov,
6b1e6cc7855b09a Jason Wang 2016-06-23 842 ARRAY_SIZE(vq->iotlb_iov),
6b1e6cc7855b09a Jason Wang 2016-06-23 843 VHOST_ACCESS_RO);
6b1e6cc7855b09a Jason Wang 2016-06-23 844 if (ret < 0) {
6b1e6cc7855b09a Jason Wang 2016-06-23 845 vq_err(vq, "IOTLB translation failure: uaddr "
6b1e6cc7855b09a Jason Wang 2016-06-23 846 "%p size 0x%llx\n", from,
6b1e6cc7855b09a Jason Wang 2016-06-23 847 (unsigned long long) size);
6b1e6cc7855b09a Jason Wang 2016-06-23 848 goto out;
6b1e6cc7855b09a Jason Wang 2016-06-23 849 }
6b1e6cc7855b09a Jason Wang 2016-06-23 850 iov_iter_init(&f, READ, vq->iotlb_iov, ret, size);
6b1e6cc7855b09a Jason Wang 2016-06-23 851 ret = copy_from_iter(to, size, &f);
6b1e6cc7855b09a Jason Wang 2016-06-23 852 if (ret == size)
6b1e6cc7855b09a Jason Wang 2016-06-23 853 ret = 0;
6b1e6cc7855b09a Jason Wang 2016-06-23 854 }
6b1e6cc7855b09a Jason Wang 2016-06-23 855
6b1e6cc7855b09a Jason Wang 2016-06-23 856 out:
6b1e6cc7855b09a Jason Wang 2016-06-23 857 return ret;
6b1e6cc7855b09a Jason Wang 2016-06-23 858 }
6b1e6cc7855b09a Jason Wang 2016-06-23 859
f889491380582b4 Jason Wang 2017-02-28 860 static void __user *__vhost_get_user_slow(struct vhost_virtqueue *vq,
f889491380582b4 Jason Wang 2017-02-28 861 void __user *addr, unsigned int size,
f889491380582b4 Jason Wang 2017-02-28 862 int type)
6b1e6cc7855b09a Jason Wang 2016-06-23 863 {
6b1e6cc7855b09a Jason Wang 2016-06-23 864 int ret;
6b1e6cc7855b09a Jason Wang 2016-06-23 865
6b1e6cc7855b09a Jason Wang 2016-06-23 866 ret = translate_desc(vq, (u64)(uintptr_t)addr, size, vq->iotlb_iov,
6b1e6cc7855b09a Jason Wang 2016-06-23 867 ARRAY_SIZE(vq->iotlb_iov),
6b1e6cc7855b09a Jason Wang 2016-06-23 868 VHOST_ACCESS_RO);
6b1e6cc7855b09a Jason Wang 2016-06-23 869 if (ret < 0) {
6b1e6cc7855b09a Jason Wang 2016-06-23 870 vq_err(vq, "IOTLB translation failure: uaddr "
6b1e6cc7855b09a Jason Wang 2016-06-23 871 "%p size 0x%llx\n", addr,
6b1e6cc7855b09a Jason Wang 2016-06-23 872 (unsigned long long) size);
6b1e6cc7855b09a Jason Wang 2016-06-23 873 return NULL;
6b1e6cc7855b09a Jason Wang 2016-06-23 874 }
6b1e6cc7855b09a Jason Wang 2016-06-23 875
6b1e6cc7855b09a Jason Wang 2016-06-23 876 if (ret != 1 || vq->iotlb_iov[0].iov_len != size) {
6b1e6cc7855b09a Jason Wang 2016-06-23 877 vq_err(vq, "Non atomic userspace memory access: uaddr "
6b1e6cc7855b09a Jason Wang 2016-06-23 878 "%p size 0x%llx\n", addr,
6b1e6cc7855b09a Jason Wang 2016-06-23 879 (unsigned long long) size);
6b1e6cc7855b09a Jason Wang 2016-06-23 880 return NULL;
6b1e6cc7855b09a Jason Wang 2016-06-23 881 }
6b1e6cc7855b09a Jason Wang 2016-06-23 882
6b1e6cc7855b09a Jason Wang 2016-06-23 883 return vq->iotlb_iov[0].iov_base;
6b1e6cc7855b09a Jason Wang 2016-06-23 884 }
6b1e6cc7855b09a Jason Wang 2016-06-23 885
f889491380582b4 Jason Wang 2017-02-28 886 /* This function should be called after iotlb
f889491380582b4 Jason Wang 2017-02-28 887 * prefetch, which means we're sure that vq
f889491380582b4 Jason Wang 2017-02-28 888 * could be access through iotlb. So -EAGAIN should
f889491380582b4 Jason Wang 2017-02-28 889 * not happen in this case.
f889491380582b4 Jason Wang 2017-02-28 890 */
f889491380582b4 Jason Wang 2017-02-28 891 static inline void __user *__vhost_get_user(struct vhost_virtqueue *vq,
f889491380582b4 Jason Wang 2017-02-28 892 void *addr, unsigned int size,
f889491380582b4 Jason Wang 2017-02-28 893 int type)
f889491380582b4 Jason Wang 2017-02-28 894 {
f889491380582b4 Jason Wang 2017-02-28 895 void __user *uaddr = vhost_vq_meta_fetch(vq,
f889491380582b4 Jason Wang 2017-02-28 896 (u64)(uintptr_t)addr, size, type);
f889491380582b4 Jason Wang 2017-02-28 897 if (uaddr)
f889491380582b4 Jason Wang 2017-02-28 898 return uaddr;
f889491380582b4 Jason Wang 2017-02-28 899
f889491380582b4 Jason Wang 2017-02-28 900 return __vhost_get_user_slow(vq, addr, size, type);
f889491380582b4 Jason Wang 2017-02-28 901 }
f889491380582b4 Jason Wang 2017-02-28 902
6b1e6cc7855b09a Jason Wang 2016-06-23 903 #define vhost_put_user(vq, x, ptr) \
6b1e6cc7855b09a Jason Wang 2016-06-23 904 ({ \
6b1e6cc7855b09a Jason Wang 2016-06-23 905 int ret = -EFAULT; \
6b1e6cc7855b09a Jason Wang 2016-06-23 906 if (!vq->iotlb) { \
6b1e6cc7855b09a Jason Wang 2016-06-23 907 ret = __put_user(x, ptr); \
6b1e6cc7855b09a Jason Wang 2016-06-23 908 } else { \
6b1e6cc7855b09a Jason Wang 2016-06-23 909 __typeof__(ptr) to = \
f889491380582b4 Jason Wang 2017-02-28 910 (__typeof__(ptr)) __vhost_get_user(vq, ptr, \
f889491380582b4 Jason Wang 2017-02-28 911 sizeof(*ptr), VHOST_ADDR_USED); \
6b1e6cc7855b09a Jason Wang 2016-06-23 912 if (to != NULL) \
6b1e6cc7855b09a Jason Wang 2016-06-23 913 ret = __put_user(x, to); \
6b1e6cc7855b09a Jason Wang 2016-06-23 914 else \
6b1e6cc7855b09a Jason Wang 2016-06-23 915 ret = -EFAULT; \
6b1e6cc7855b09a Jason Wang 2016-06-23 916 } \
6b1e6cc7855b09a Jason Wang 2016-06-23 917 ret; \
6b1e6cc7855b09a Jason Wang 2016-06-23 918 })
6b1e6cc7855b09a Jason Wang 2016-06-23 919
7b5d753ebc22c5b Jason Wang 2019-05-24 920 static inline int vhost_put_avail_event(struct vhost_virtqueue *vq)
7b5d753ebc22c5b Jason Wang 2019-05-24 921 {
7b5d753ebc22c5b Jason Wang 2019-05-24 922 return vhost_put_user(vq, cpu_to_vhost16(vq, vq->avail_idx),
7b5d753ebc22c5b Jason Wang 2019-05-24 923 vhost_avail_event(vq));
7b5d753ebc22c5b Jason Wang 2019-05-24 924 }
7b5d753ebc22c5b Jason Wang 2019-05-24 925
7b5d753ebc22c5b Jason Wang 2019-05-24 926 static inline int vhost_put_used(struct vhost_virtqueue *vq,
7b5d753ebc22c5b Jason Wang 2019-05-24 927 struct vring_used_elem *head, int idx,
7b5d753ebc22c5b Jason Wang 2019-05-24 928 int count)
7b5d753ebc22c5b Jason Wang 2019-05-24 929 {
7b5d753ebc22c5b Jason Wang 2019-05-24 930 return vhost_copy_to_user(vq, vq->used->ring + idx, head,
7b5d753ebc22c5b Jason Wang 2019-05-24 931 count * sizeof(*head));
7b5d753ebc22c5b Jason Wang 2019-05-24 932 }
7b5d753ebc22c5b Jason Wang 2019-05-24 933
7b5d753ebc22c5b Jason Wang 2019-05-24 934 static inline int vhost_put_used_flags(struct vhost_virtqueue *vq)
7b5d753ebc22c5b Jason Wang 2019-05-24 935
7b5d753ebc22c5b Jason Wang 2019-05-24 936 {
7b5d753ebc22c5b Jason Wang 2019-05-24 @937 return vhost_put_user(vq, cpu_to_vhost16(vq, vq->used_flags),
7b5d753ebc22c5b Jason Wang 2019-05-24 938 &vq->used->flags);
7b5d753ebc22c5b Jason Wang 2019-05-24 939 }
7b5d753ebc22c5b Jason Wang 2019-05-24 940
:::::: The code at line 937 was first introduced by commit
:::::: 7b5d753ebc22c5b6935a70ce9a857dc6220784f8 vhost: fine grain userspace memory accessors
:::::: TO: Jason Wang <jasowang@xxxxxxxxxx>
:::::: CC: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
Attachment:
.config.gz
Description: application/gzip