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2025-07-15hw/vfio-user: wait for proxy close correctlyJohn Levon1-4/+6
Coverity reported: CID 1611806: Concurrent data access violations (BAD_CHECK_OF_WAIT_COND) A wait is performed without a loop. If there is a spurious wakeup, the condition may not be satisfied. Fix this by checking ->state for VFIO_PROXY_CLOSED in a loop. Also rename the callback for clarity. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Mark Cave-Ayland <markcaveayland@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250715115954.515819-4-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: add coalesced posted writesJohn Levon1-0/+84
Add new message to send multiple writes to server in a single message. Prevents the outgoing queue from overflowing when a long latency operation is followed by a series of posted writes. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-18-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: support posted writesJohn Levon1-2/+10
Support an asynchronous send of a vfio-user socket message (no wait for a reply) when the write is posted. This is only safe when no regions are mappable by the VM. Add an option to explicitly disable this as well. Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-17-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: add 'x-msg-timeout' optionJohn Levon1-3/+4
By default, the vfio-user subsystem will wait 5 seconds for a message reply from the server. Add an option to allow this to be configurable. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-16-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: implement VFIO_USER_DMA_READ/WRITEJohn Levon1-0/+97
Unlike most other messages, this is a server->client message, for when a server wants to do "DMA"; this is slow, so normally the server has memory directly mapped instead. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-15-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: implement VFIO_USER_DMA_MAP/UNMAPJohn Levon1-2/+82
When the vfio-user container gets mapping updates, share them with the vfio-user by sending a message; this can include the region fd, allowing the server to directly mmap() the region as needed. For performance, we only wait for the message responses when we're doing with a series of updates via the listener_commit() callback. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-14-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: implement VFIO_USER_DEVICE_GET_INFOJohn Levon1-6/+4
Add support for getting basic device information. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-6-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: implement message send infrastructureJohn Levon1-0/+515
Add plumbing for sending vfio-user messages on the control socket. Add initial version negotation on connection. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-5-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: implement message receive infrastructureJohn Levon1-0/+411
Add the basic implementation for receiving vfio-user messages from the control socket. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-4-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-06-26vfio-user: connect vfio proxy to remote serverJohn Levon1-0/+162
Introduce the vfio-user "proxy": this is the client code responsible for sending and receiving vfio-user messages across the control socket. The new files hw/vfio-user/proxy.[ch] contain some basic plumbing for managing the proxy; initialize the proxy during realization of the VFIOUserPCIDevice instance. Originally-by: John Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John Levon <john.levon@nutanix.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250625193012.2316242-3-john.levon@nutanix.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
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