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https://gitlab.uni-freiburg.de/opensourcevdi/spice-protocol
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72b225b9fc
While discussing various things with Alon in Vancouver, it came up that having a channel which simply passes through data coming out of a qemu chardev frontend unmodified, like the usbredir channel does, can be used for a lot of other cases too. To facilitate this the usbredir channel code will be turned into a generic spicevmc channel, which is just a passthrough to the client, from the spicevmc chardev. This patch renames the msg types to make clear that they are not usbredir specific, but instead are generic spicevmc data passthrough messages. The usbredir channel id is unmodified by this, although the same code and messages can now be used for multiple purposes, we still need unique ids for each purpose, so that the client knows how to interpret / represent the passed through data. Some examples of why having a generic spicevmc pass through is good: 1) We could add a monitor channel, allowing access to the qemu monitor from the spice client, since the monitor is a chardev frontend we could re-use the generic spicevmc channel server code, so all that is needed to add this (server side) would be reserving a new channel id for this. 2) We could allow users to come up with new channels of their own, without requiring qemu or server modification. The idea is to allow doing something like this on the qemu startup cmdline: -chardev spicevmc,name=generic,channelid=128 To ensure these new "generic" channels cannot conflict with newly added official types, the must start at the SPICE_CHANNEL_USER_DEFINED_START value this patch adds (128 or higher). These new user defined channels could then either be used with a special modified client, with client plugins (if we add support for those), or by exporting them on the client side for use by an external ap, see below. 3) We could also add support to the client to make user-defined channels end in a unix socket / pipe, allowing handling of the data by an external app, we could for example have a new spice client cmdline argument like this: --custom-channel unixsocket=/tmp/mysocket,channelid=128 This would allow for something like: $random app on guest -> virtio-serial -> spicevmc chardev -> -> spicevmc channel -> unix socket -> $random app on client 4) On hind sight this could also have been used for the smartcard stuff, with a 1 channel / reader model, rather then the current multiplexing code where we've our own multiplexing protocol wrapper over the libcacard smartcard protocol. Signed-off-by: Hans de Goede <hdegoede@redhat.com> |
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| .. | ||
| barrier.h | ||
| controller_prot.h | ||
| end-packed.h | ||
| enums.h | ||
| error_codes.h | ||
| foreign_menu_prot.h | ||
| ipc_ring.h | ||
| macros.h | ||
| Makefile.am | ||
| protocol.h | ||
| qxl_dev.h | ||
| start-packed.h | ||
| stats.h | ||
| types.h | ||
| vd_agent.h | ||
| vdi_dev.h | ||