kernel/linux.git/drivers/vhost/vringh.c, branch linux-7.1.y

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

vhost: vringh: Fix copy_to_iter return value check

2025-10-01T11:24:31+00:00

The return value of copy_to_iter can't be negative, check whether the copied length is equal to the requested length instead of checking for negative values. Fixes: 309bba39c945 ("vringh: iterate on iotlb_translate to handle large translations") Cc: "Stefano Garzarella" Cc: zhang jiao Link: https://lore.kernel.org/all/20250910091739.2999-1-zhangjiao2@cmss.chinamobile.com Message-ID: Signed-off-by: Michael S. Tsirkin

vhost: vringh: Modify the return value check

2025-10-01T11:24:20+00:00

The return value of copy_from_iter and copy_to_iter can't be negative, check whether the copied lengths are equal. Fixes: 309bba39c945 ("vringh: iterate on iotlb_translate to handle large translations") Cc: "Stefano Garzarella" Signed-off-by: zhang jiao Message-Id: <20250910091739.2999-1-zhangjiao2@cmss.chinamobile.com> Signed-off-by: Michael S. Tsirkin

vhost: vringh: Remove unused functions

2025-08-01T13:11:08+00:00

The functions: vringh_abandon_kern() vringh_abandon_user() vringh_iov_pull_kern() and vringh_iov_push_kern() were all added in 2013 by commit f87d0fbb5798 ("vringh: host-side implementation of virtio rings.") but have remained unused. Remove them and the two helper functions they used. Signed-off-by: Dr. David Alan Gilbert Message-Id: <20250617001838.114457-3-linux@treblig.org> Signed-off-by: Michael S. Tsirkin Acked-by: Eugenio Pérez Tested-by: Lei Yang Reviewed-by: Simon Horman

vhost: vringh: Remove unused iotlb functions

2025-08-01T13:11:08+00:00

The functions: vringh_abandon_iotlb() vringh_notify_disable_iotlb() and vringh_notify_enable_iotlb() were added in 2020 by commit 9ad9c49cfe97 ("vringh: IOTLB support") but have remained unused. Remove them. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Simon Horman Message-Id: <20250617001838.114457-2-linux@treblig.org> Signed-off-by: Michael S. Tsirkin Acked-by: Eugenio Pérez Tested-by: Lei Yang

vringh: use bvec_kmap_local

2025-05-27T14:27:53+00:00

Use the bvec_kmap_local helper rather than digging into the bvec internals. Signed-off-by: Christoph Hellwig Message-Id: <20250501142244.2888227-1-hch@lst.de> Signed-off-by: Michael S. Tsirkin Reviewed-by: Chaitanya Kulkarni

vhost: vringh: Use matching allocation type in resize_iovec()

2025-05-27T14:27:53+00:00

In preparation for making the kmalloc family of allocators type aware, we need to make sure that the returned type from the allocation matches the type of the variable being assigned. (Before, the allocator would always return "void *", which can be implicitly cast to any pointer type.) The assigned type is "struct kvec *", but the returned type will be "struct iovec *". These have the same allocation size, so there is no bug: struct kvec { void *iov_base; /* and that should *never* hold a userland pointer */ size_t iov_len; }; struct iovec { void __user *iov_base; /* BSD uses caddr_t (1003.1g requires void *) */ __kernel_size_t iov_len; /* Must be size_t (1003.1g) */ }; Adjust the allocation type to match the assignment. Signed-off-by: Kees Cook Message-Id: <20250426062214.work.334-kees@kernel.org> Signed-off-by: Michael S. Tsirkin

vringh: add MODULE_DESCRIPTION()

2024-07-09T12:42:40+00:00

Fix the allmodconfig 'make w=1' issue: WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/vhost/vringh.o Signed-off-by: Jeff Johnson Message-Id: <20240516-md-vringh-v1-1-31bf37779a5a@quicinc.com> Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang

vringh: don't use vringh_kiov_advance() in vringh_iov_xfer()

2023-10-04T07:26:48+00:00

In the while loop of vringh_iov_xfer(), `partlen` could be 0 if one of the `iov` has 0 lenght. In this case, we should skip the iov and go to the next one. But calling vringh_kiov_advance() with 0 lenght does not cause the advancement, since it returns immediately if asked to advance by 0 bytes. Let's restore the code that was there before commit b8c06ad4d67d ("vringh: implement vringh_kiov_advance()"), avoiding using vringh_kiov_advance(). Fixes: b8c06ad4d67d ("vringh: implement vringh_kiov_advance()") Cc: stable@vger.kernel.org Reported-by: Jason Wang Signed-off-by: Stefano Garzarella Acked-by: Jason Wang Signed-off-by: David S. Miller

vringh: support VA with iotlb

2023-04-21T07:02:33+00:00

vDPA supports the possibility to use user VA in the iotlb messages. So, let's add support for user VA in vringh to use it in the vDPA simulators. Acked-by: Eugenio Pérez Signed-off-by: Stefano Garzarella Message-Id: <20230404131716.45855-1-sgarzare@redhat.com> Signed-off-by: Michael S. Tsirkin