bwlp/qemu.git/hw/virtio/trace-events, branch master

vhost: enable vrings in vhost_dev_start() for vhost-user devices

2022-12-01T07:30:04+00:00

Commit 02b61f38d3 ("hw/virtio: incorporate backend features in features") properly negotiates VHOST_USER_F_PROTOCOL_FEATURES with the vhost-user backend, but we forgot to enable vrings as specified in docs/interop/vhost-user.rst: If ``VHOST_USER_F_PROTOCOL_FEATURES`` has not been negotiated, the ring starts directly in the enabled state. If ``VHOST_USER_F_PROTOCOL_FEATURES`` has been negotiated, the ring is initialized in a disabled state and is enabled by ``VHOST_USER_SET_VRING_ENABLE`` with parameter 1. Some vhost-user front-ends already did this by calling vhost_ops.vhost_set_vring_enable() directly: - backends/cryptodev-vhost.c - hw/net/virtio-net.c - hw/virtio/vhost-user-gpio.c But most didn't do that, so we would leave the vrings disabled and some backends would not work. We observed this issue with the rust version of virtiofsd [1], which uses the event loop [2] provided by the vhost-user-backend crate where requests are not processed if vring is not enabled. Let's fix this issue by enabling the vrings in vhost_dev_start() for vhost-user front-ends that don't already do this directly. Same thing also in vhost_dev_stop() where we disable vrings. [1] https://gitlab.com/virtio-fs/virtiofsd [2] https://github.com/rust-vmm/vhost/blob/240fc2966/crates/vhost-user-backend/src/event_loop.rs#L217 Fixes: 02b61f38d3 ("hw/virtio: incorporate backend features in features") Reported-by: German Maglione Tested-by: German Maglione Signed-off-by: Stefano Garzarella Acked-by: Raphael Norwitz Message-Id: <20221123131630.52020-1-sgarzare@redhat.com> Signed-off-by: Alex Bennée Reviewed-by: Michael S. Tsirkin Message-Id: <20221130112439.2527228-3-alex.bennee@linaro.org> Signed-off-by: Michael S. Tsirkin

hw/virtio: add boilerplate for vhost-user-gpio device

2022-10-07T13:41:51+00:00

This creates the QEMU side of the vhost-user-gpio device which connects to the remote daemon. It is based of vhost-user-i2c code. Signed-off-by: Viresh Kumar Reviewed-by: Alex Bennée Message-Id: <5390324a748194a21bc99b1538e19761a8c64092.1641987128.git.viresh.kumar@linaro.org> [AJB: fixes for qtest, tweaks to feature bits] Signed-off-by: Alex Bennée Cc: Vincent Whitchurch Message-Id: <20220802095010.3330793-13-alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin

hw/virtio: add some vhost-user trace events

2022-10-07T13:41:51+00:00

These are useful for tracing the lifetime of vhost-user connections. Signed-off-by: Alex Bennée Message-Id: <20220802095010.3330793-10-alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Philippe Mathieu-Daudé

virtio-iommu: Add bypass mode support to assigned device

2022-06-16T16:54:58+00:00

Currently assigned devices can not work in virtio-iommu bypass mode. Guest driver fails to probe the device due to DMA failure. And the reason is because of lacking GPA -> HPA mappings when VM is created. Add a root container memory region to hold both bypass memory region and iommu memory region, so the switch between them is supported just like the implementation in virtual VT-d. Signed-off-by: Zhenzhong Duan Message-Id: <20220613061010.2674054-2-zhenzhong.duan@intel.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin

virtio/vhost-user: dynamically assign VhostUserHostNotifiers

2022-05-16T08:38:40+00:00

At a couple of hundred bytes per notifier allocating one for every potential queue is very wasteful as most devices only have a few queues. Instead of having this handled statically dynamically assign them and track in a GPtrArray. [AJB: it's hard to trigger the vhost notifiers code, I assume as it requires a KVM guest with appropriate backend] Signed-off-by: Alex Bennée Message-Id: <20220321153037.3622127-14-alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin

hw/virtio: add vhost_user_[read|write] trace points

2022-05-16T08:38:40+00:00

These are useful when trying to debug the initial vhost-user negotiation, especially when it hard to get logging from the low level library on the other side. Signed-off-by: Alex Bennée Message-Id: <20220321153037.3622127-4-alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Philippe Mathieu-Daudé

virtio-pci: add notification trace points

2022-05-16T08:38:40+00:00

Signed-off-by: Alex Bennée Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20200925125147.26943-6-alex.bennee@linaro.org> Signed-off-by: Alex Bennée Message-Id: <20220321153037.3622127-3-alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin

vdpa: Add missing tracing to batch mapping functions

2022-04-26T10:32:47+00:00

These functions were not traced properly. Signed-off-by: Eugenio Pérez Reviewed-by: Laurent Vivier Reviewed-by: Stefano Garzarella Acked-by: Jason Wang Message-Id: <20220405063628.853745-1-eperezma@redhat.com> Signed-off-by: Laurent Vivier

virtio-iommu: Default to bypass during boot

2022-03-06T10:08:23+00:00

Currently the virtio-iommu device must be programmed before it allows DMA from any PCI device. This can make the VM entirely unusable when a virtio-iommu driver isn't present, for example in a bootloader that loads the OS from storage. Similarly to the other vIOMMU implementations, default to DMA bypassing the IOMMU during boot. Add a "boot-bypass" property, defaulting to true, that lets users change this behavior. Replace the VIRTIO_IOMMU_F_BYPASS feature, which didn't support bypass before feature negotiation, with VIRTIO_IOMMU_F_BYPASS_CONFIG. We add the bypass field to the migration stream without introducing subsections, based on the assumption that this virtio-iommu device isn't being used in production enough to require cross-version migration at the moment (all previous version required workarounds since they didn't support ACPI and boot-bypass). Reviewed-by: Eric Auger Signed-off-by: Jean-Philippe Brucker Message-Id: <20220214124356.872985-3-jean-philippe@linaro.org> Acked-by: Cornelia Huck Reviewed-by: Eric Auger Tested-by: Eric Auger Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin

Revert "vhost-vdpa: add support for config interrupt"

2022-01-10T21:01:44+00:00

This reverts commit 634f7c89fbd78f57d00d5d6b39c0ade9df1fe27f. Fixes: 634f7c89fb ("vhost-vdpa: add support for config interrupt") Cc: "Cindy Lu" Signed-off-by: Michael S. Tsirkin