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From: | Jiri 'Ghormoon' Novak |
Subject: | Re: [Qemu-devel] virtio-input questions |
Date: | Mon, 16 Nov 2015 18:28:48 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0 SeaMonkey/2.33.1 |
Hi, Gerd Hoffmann wrote:
Maybe I've formulated it bit wrong, the part I should be taking from curses was mainly about how to feed it to qemu input. I'll have to look into that a more in detail, I don't understand it much yet :)Hi,Seems I'll try to start from the curses.c then, if that's better way (my knowledge of qemu codebase is zero and I'm not a good developer either, but I may try in my free time since I need this and I'd likeI wouldn't bother with curses. Better grab input events directly at the source, like virtio-input-host does. Check out hw/input/virtio-input-host.c, or https://www.kraxel.org/cgit/input/ (probably gives a better idea how to interpret the linux input layer events). Also note that hw/input/virtio-input-hid.c has a qcode -> linux mapping table, which should be usable to generate a reverse mapping. You'll need that to feed linux keyboard events into the qemu input code.
Well, but eg. for Debian, stable doesn't have the drivers yet. You need a backport kernel :) Or even worse - Windows guest which won't take it at all yet. Or maybe others. if you're booting something in the guest with vga and keyboard passthrough, there's still big chance you won't have the keyboard working. so that's the reason to use qemu input. And for the windows - that's a quite common reason for vga passthrough - you have disposable gaming VM (running on LUKS+ZFS drive and it doesn't complain :P)to see it upstream - there are more people trying vga passthrough who possibly need this :)) At least keyboard, mouse is nice to have, but that can be done with the virtio-input, it's not crucial eg. during installation where you may not have those drivers.If virtio-input works for the mouse it should work equally well for keyboard. Guest drivers are upstream in kernel 4.1 & newer. Fedora 22 should work once you've updated the kernel (shipped with kernel 4.0.x, now at 4.2.x). With the just released Fedora 23 virtio-input should even work on the install media (didn't test that yet though ...).
I was just wondering if you don't have a bunch of testing VMs that you've already used for this to quickly rule out one side (host or guest).I'm using standard fedora install, without any special tweaks (other than a self-compiled kernel in the early days, but even that isn't needed any more). cheers, Gerd
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