kernel/linux.git/include/linux/vringh.h, branch v6.19.11

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: address kdoc warnings

2023-04-21T07:02:34+00:00

Address some minor kdoc warnings in vring.h. * Place kdoc for 'struct vringh_config_ops' immediately before the structure * Add missing documentation of members of 'vringh_iov' and 'vringh_kiov' Warnings flagged by: $ ./scripts/kernel-doc -none include/linux/vringh.h include/linux/vringh.h:68: error: Cannot parse struct or union! include/linux/vringh.h:92: warning: Function parameter or member 'iov' not described in 'vringh_iov' include/linux/vringh.h:92: warning: Function parameter or member 'consumed' not described in 'vringh_iov' include/linux/vringh.h:92: warning: Function parameter or member 'i' not described in 'vringh_iov' include/linux/vringh.h:92: warning: Function parameter or member 'used' not described in 'vringh_iov' include/linux/vringh.h:92: warning: Function parameter or member 'max_num' not described in 'vringh_iov' include/linux/vringh.h:104: warning: Function parameter or member 'iov' not described in 'vringh_kiov' include/linux/vringh.h:104: warning: Function parameter or member 'consumed' not described in 'vringh_kiov' include/linux/vringh.h:104: warning: Function parameter or member 'i' not described in 'vringh_kiov' include/linux/vringh.h:104: warning: Function parameter or member 'used' not described in 'vringh_kiov' include/linux/vringh.h:104: warning: Function parameter or member 'max_num' not described in 'vringh_kiov' Signed-off-by: Simon Horman Message-Id: <20230331-vhost-fixes-v1-2-1f046e735b9e@kernel.org> Signed-off-by: Michael S. Tsirkin

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

vringh: fix a typo in comments for vringh_kiov

2023-02-21T00:26:59+00:00

Probably it is a simple copy error from struct vring_iov. Signed-off-by: Shunsuke Mie Message-Id: <20230202104248.2040652-1-mie@igel.co.jp> Signed-off-by: Michael S. Tsirkin

vringh: pull in spinlock header

2021-08-11T10:44:24+00:00

we use a spinlock now pull in the correct header to make vring.h self sufficient. Signed-off-by: Michael S. Tsirkin

vringh: add vringh_kiov_length() helper

2021-05-03T08:55:53+00:00

This new helper returns the total number of bytes covered by a vringh_kiov. Suggested-by: Jason Wang Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20210315163450.254396-7-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vringh: implement vringh_kiov_advance()

2021-05-03T08:55:53+00:00

In some cases, it may be useful to provide a way to skip a number of bytes in a vringh_kiov. Let's implement vringh_kiov_advance() for this purpose, reusing the code from vringh_iov_xfer(). We replace that code calling the new vringh_kiov_advance(). Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20210315163450.254396-6-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

vringh: add 'iotlb_lock' to synchronize iotlb accesses

2021-05-03T08:55:52+00:00

Usually iotlb accesses are synchronized with a spinlock. Let's request it as a new parameter in vringh_set_iotlb() and hold it when we navigate the iotlb in iotlb_translate() to avoid race conditions with any new additions/deletions of ranges from the ioltb. Acked-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20210315163450.254396-3-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin

virtio: force spec specified alignment on types

2020-06-02T06:45:13+00:00

The ring element addresses are passed between components with different alignments assumptions. Thus, if guest/userspace selects a pointer and host then gets and dereferences it, we might need to decrease the compiler-selected alignment to prevent compiler on the host from assuming pointer is aligned. This actually triggers on ARM with -mabi=apcs-gnu - which is a deprecated configuration, but it seems safer to handle this generally. Note that userspace that allocates the memory is actually OK and does not need to be fixed, but userspace that gets it from guest or another process does need to be fixed. The later doesn't generally talk to the kernel so while it might be buggy it's not talking to the kernel in the buggy way - it's just using the header in the buggy way - so fixing header and asking userspace to recompile is the best we can do. I verified that the produced kernel binary on x86 is exactly identical before and after the change. Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang