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Re: [Qemu-devel] Re: Question about KVM and PC speaker
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] Re: Question about KVM and PC speaker |
Date: |
Thu, 23 Apr 2009 19:42:14 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
Avi Kivity wrote:
> Jan Kiszka wrote:
>> Avi Kivity wrote:
>>
>>> Jan Kiszka wrote:
>>>
>>>> Huh, it is! Then the problem is a KVM-only thing: The kernel part hooks
>>>> onto those resources but doesn't communicate changes to this user space
>>>> backend.
>>>>
>>> In this case, the -no-kvm-pit option should help.
>>>
>>
>> Probably fine in many cases (where the PIT is no longer used anyway),
>> just a bit unintuitive for users.
>>
>
> Yes, it's only a workaround.
>
>> I wonder why KVM moved port 0x61 handling into kernel space at all. By
>> leaving it in pcspk hands and extending the latter to sync with the
>> in-kernel PIT on sample generation, this speaker regression (of
>> kvm-userspace) should have been avoidable.
>>
>
> I'd rather not have partial components in the kernel. This case is
> particularly icky though.
But you surely don't want to issue the sound from kernel space.
Moreover, these are separate components: the PIT doesn't bother about
the speaker, if it's on or off. We just need to make pcspk KVM-aware. I
think I will post a patch later today.
Jan
--
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
- [Qemu-devel] Re: Question about KVM and PC speaker, (continued)
- [Qemu-devel] Re: Question about KVM and PC speaker, Jan Kiszka, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Samuel Thibault, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Jan Kiszka, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Samuel Thibault, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Jan Kiszka, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Avi Kivity, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Jan Kiszka, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker, Avi Kivity, 2009/04/23
- Re: [Qemu-devel] Re: Question about KVM and PC speaker,
Jan Kiszka <=
[Qemu-devel] Question about KVM and PC speaker, Simon Bienlein, 2009/04/23