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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 12:29:30 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv: Gecko/20080226 SUSE/ Thunderbird/ Mnenhy/

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.

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.


Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux

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