kernel/linux.git/drivers/vhost/vhost.h, branch linux-5.9.y

vhost: add helper to check if a vq has been setup

2020-12-02T07:51:50+00:00

[ Upstream commit 6bcf34224ac1e94103797fd68b9836061762f2b2 ] This adds a helper check if a vq has been setup. The next patches will use this when we move the vhost scsi cmd preallocation from per session to per vq. In the per vq case, we only want to allocate cmds for vqs that have actually been setup and not for all the possible vqs. Signed-off-by: Mike Christie Link: https://lore.kernel.org/r/1604986403-4931-2-git-send-email-michael.christie@oracle.com Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang Acked-by: Stefan Hajnoczi Signed-off-by: Sasha Levin

vhost: generialize backend features setting/getting

2020-08-05T22:39:18+00:00

Move the backend features setting/getting from net.c to vhost.c to be reused by vhost-vdpa. Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200804162048.22587-3-eli@mellanox.com Signed-off-by: Michael S. Tsirkin

vhost: introduce vhost_vring_call

2020-08-05T15:08:42+00:00

This commit introduces struct vhost_vring_call which replaced raw struct eventfd_ctx *call_ctx in struct vhost_virtqueue. Besides eventfd_ctx, it contains a spin lock and an irq_bypass_producer in its structure. Signed-off-by: Zhu Lingshan Suggested-by: Jason Wang Link: https://lore.kernel.org/r/20200731065533.4144-2-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin

vhost: allow device that does not depend on vhost worker

2020-06-04T19:36:51+00:00

vDPA device currently relays the eventfd via vhost worker. This is inefficient due the latency of wakeup and scheduling, so this patch tries to introduce a use_worker attribute for the vhost device. When use_worker is not set with vhost_dev_init(), vhost won't try to allocate a worker thread and the vhost_poll will be processed directly in the wakeup function. This help for vDPA since it reduces the latency caused by vhost worker. In my testing, it saves 0.2 ms in pings between VMs on a mutual host. Signed-off-by: Zhu Lingshan Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200529080303.15449-2-jasowang@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

vhost: Create accessors for virtqueues private_data

2020-04-16T22:31:07+00:00

Signed-off-by: Eugenio Pérez Link: https://lore.kernel.org/r/20200331192804.6019-2-eperezma@redhat.com Signed-off-by: Michael S. Tsirkin

vhost: factor out IOTLB

2020-04-01T16:06:26+00:00

This patch factors out IOTLB into a dedicated module in order to be reused by other modules like vringh. User may choose to enable the automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit for the case of vhost device IOTLB implementation. Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200326140125.19794-4-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin

vhost: allow per device message handler

2020-04-01T16:06:26+00:00

This patch allow device to register its own message handler during vhost_dev_init(). vDPA device will use it to implement its own DMA mapping logic. Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200326140125.19794-3-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin

vhost, kcov: collect coverage from vhost_worker

2019-12-05T03:44:14+00:00

Add kcov_remote_start()/kcov_remote_stop() annotations to the vhost_worker() function, which is responsible for processing vhost works. Since vhost_worker() threads are spawned per vhost device instance the common kcov handle is used for kcov_remote_start()/stop() annotations (see Documentation/dev-tools/kcov.rst for details). As the result kcov can now be used to collect coverage from vhost worker threads. Link: http://lkml.kernel.org/r/e49d5d154e5da6c9ada521d2b7ce10a49ce9f98b.1572366574.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov Cc: Alan Stern Cc: Alexander Potapenko Cc: Anders Roxell Cc: Arnd Bergmann Cc: David Windsor Cc: Dmitry Vyukov Cc: Elena Reshetova Cc: Greg Kroah-Hartman Cc: Jason Wang Cc: Marco Elver Cc: "Michael S. Tsirkin" Cc: Steven Rostedt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Revert "vhost: access vq metadata through kernel virtual address"

2019-09-04T11:39:48+00:00

This reverts commit 7f466032dc ("vhost: access vq metadata through kernel virtual address"). The commit caused a bunch of issues, and while commit 73f628ec9e ("vhost: disable metadata prefetch optimization") disabled the optimization it's not nice to keep lots of dead code around. Signed-off-by: Michael S. Tsirkin