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-[Qemu-devel] Can I have someone's feedback on [bug 1809075] Concurrency bug on keyboard events: capslock LED messing up keycode streams causes character misses at guest kernel
-
-Hi everyone.
-Can I please have someone's feedback on this bug?
-https://bugs.launchpad.net/qemu/+bug/1809075
-Briefly, guest OS loses characters sent to it via vnc. And I spot the
-bug in relation to ps2 driver.
-I'm thinking of possible fixes and I might want to use a memory barrier.
-But I would really like to have some suggestion from a qemu developer
-first. For example, can we brutally drop capslock LED key events in ps2
-queue?
-It is actually relevant to openQA, an automated QA tool for openSUSE.
-And this bug blocks a few test cases for us.
-Thank you in advance!
-
-Kind regards,
-Gao Zhiyuan
-
-Cc'ing Marc-André & Gerd.
-
-On 12/19/18 10:31 AM, Gao Zhiyuan wrote:
->
-Hi everyone.
->
->
-Can I please have someone's feedback on this bug?
->
-https://bugs.launchpad.net/qemu/+bug/1809075
->
-Briefly, guest OS loses characters sent to it via vnc. And I spot the
->
-bug in relation to ps2 driver.
->
->
-I'm thinking of possible fixes and I might want to use a memory barrier.
->
-But I would really like to have some suggestion from a qemu developer
->
-first. For example, can we brutally drop capslock LED key events in ps2
->
-queue?
->
->
-It is actually relevant to openQA, an automated QA tool for openSUSE.
->
-And this bug blocks a few test cases for us.
->
->
-Thank you in advance!
->
->
-Kind regards,
->
-Gao Zhiyuan
->
-
-On Thu, Jan 03, 2019 at 12:05:54PM +0100, Philippe Mathieu-Daudé wrote:
->
-Cc'ing Marc-André & Gerd.
->
->
-On 12/19/18 10:31 AM, Gao Zhiyuan wrote:
->
-> Hi everyone.
->
->
->
-> Can I please have someone's feedback on this bug?
->
->
-https://bugs.launchpad.net/qemu/+bug/1809075
->
-> Briefly, guest OS loses characters sent to it via vnc. And I spot the
->
-> bug in relation to ps2 driver.
->
->
->
-> I'm thinking of possible fixes and I might want to use a memory barrier.
->
-> But I would really like to have some suggestion from a qemu developer
->
-> first. For example, can we brutally drop capslock LED key events in ps2
->
-> queue?
-There is no "capslock LED key event".  0xfa is KBD_REPLY_ACK, and the
-device queues it in response to guest port writes.  Yes, the ack can
-race with actual key events.  But IMO that isn't a bug in qemu.
-
-Probably the linux kernel just throws away everything until it got the
-ack for the port write, and that way the key event gets lost.  On
-physical hardware you will not notice because it is next to impossible
-to type fast enough to hit the race window.
-
-So, go fix the kernel.
-
-Alternatively fix vncdotool to send uppercase letters properly with
-shift key pressed.  Then qemu wouldn't generate capslock key events
-(that happens because qemu thinks guest and host capslock state is out
-of sync) and the guests's capslock led update request wouldn't get into
-the way.
-
-cheers,
-  Gerd
-