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path: root/hw/9pfs/xen-9p-backend.c
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2018-05-22xen: remove other open-coded use of libxengnttabPaul Durrant1-17/+15
Now that helpers are available in xen_backend, use them throughout all Xen PV backends. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Acked-by: Anthony Perard <anthony.perard@citrix.com> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
2018-02-09Move include qemu/option.h from qemu-common.h to actual usersMarkus Armbruster1-0/+1
qemu-common.h includes qemu/option.h, but most places that include the former don't actually need the latter. Drop the include, and add it to the places that actually need it. While there, drop superfluous includes of both headers, and separate #include from file comment with a blank line. This cleanup makes the number of objects depending on qemu/option.h drop from 4545 (out of 4743) to 284 in my "build everything" tree. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180201111846.21846-20-armbru@redhat.com> [Semantic conflict with commit bdd6a90a9e in block/nvme.c resolved]
2018-02-019pfs: drop v9fs_register_transport()Greg Kurz1-2/+1
No good reasons to do this outside of v9fs_device_realize_common(). Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
2018-01-089pfs: fix some type definitionsGreg Kurz1-1/+1
To comply with the QEMU coding style. Signed-off-by: Greg Kurz <groug@kaod.org>
2017-06-29xen-9pfs: disconnect if buffers are misconfiguredStefano Stabellini1-21/+64
Implement xen_9pfs_disconnect by unbinding the event channels. On xen_9pfs_free, call disconnect if any event channels haven't been disconnected. If the frontend misconfigured the buffers set the backend to "Closing" and disconnect it. Misconfigurations include requesting a read of more bytes than available on the ring buffer, or claiming to be writing more data than available on the ring buffer. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> Signed-off-by: Greg Kurz <groug@kaod.org>
2017-06-29virtio-9p: break device if buffers are misconfiguredGreg Kurz1-1/+2
The 9P protocol is transport agnostic: if the guest misconfigured the buffers, the best we can do is to set the broken flag on the device. Signed-off-by: Greg Kurz <groug@kaod.org>
2017-05-25virtio-9p/xen-9p: move 9p specific bits to core 9p codeGreg Kurz1-5/+1
These bits aren't related to the transport so let's move them to the core code. Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
2017-05-16xen: call qemu_set_cloexec instead of fcntlStefano Stabellini1-1/+1
Use the common utility function, which contains checks on return values and first calls F_GETFD as recommended by POSIX.1-2001, instead of manually calling fcntl. CID: 1374831 Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> CC: anthony.perard@citrix.com CC: groug@kaod.org CC: aneesh.kumar@linux.vnet.ibm.com CC: Eric Blake <eblake@redhat.com>
2017-05-16xen/9pfs: fix two resource leaks on error paths, discovered by CoverityStefano Stabellini1-0/+2
CID: 1374836 Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> CC: anthony.perard@citrix.com CC: groug@kaod.org CC: aneesh.kumar@linux.vnet.ibm.com
2017-04-25xen/9pfs: send responses back to the frontendStefano Stabellini1-0/+19
Once a request is completed, xen_9pfs_push_and_notify gets called. In xen_9pfs_push_and_notify, update the indexes (data has already been copied to the sg by the common code) and send a notification to the frontend. Schedule the bottom-half to check if we already have any other requests pending. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org>
2017-04-25xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshalStefano Stabellini1-2/+97
Implement xen_9pfs_init_in/out_iov_from_pdu and xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the data on the ring. This is safe as we only handle one request per ring at any given time. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org>
2017-04-25xen/9pfs: receive requests from the frontendStefano Stabellini1-0/+50
Upon receiving an event channel notification from the frontend, schedule the bottom half. From the bottom half, read one request from the ring, create a pdu and call pdu_submit to handle it. For now, only handle one request per ring at a time. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org>
2017-04-25xen/9pfs: connect to the frontendStefano Stabellini1-1/+181
Write the limits of the backend to xenstore. Connect to the frontend. Upon connection, allocate the rings according to the protocol specification. Initialize a QEMUBH to schedule work upon receiving an event channel notification from the frontend. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org>
2017-04-25xen/9pfs: introduce Xen 9pfs backendStefano Stabellini1-0/+96
Introduce the Xen 9pfs backend: add struct XenDevOps to register as a Xen backend and add struct V9fsTransport to register as v9fs transport. All functions are empty stubs for now. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> Reviewed-by: Greg Kurz <groug@kaod.org> CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> CC: Greg Kurz <groug@kaod.org>
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