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Re: [libvirt] [PATCH v2 1/9] qemu: Set QEMU_AUDIO_DRV=none with -nographic

On Mon, Aug 19, 2013 at 12:24:39PM -0400, Cole Robinson wrote:
> On my machine, a guest fails to boot if it has a sound card, but not
> graphical device/display is configured, because pulseaudio fails to
> initialize since it can't access $HOME.
> A workaround is removing the audio device, however on ARM boards there
> isn't any option to do that, so -nographic always fails.
> Set QEMU_AUDIO_DRV=none if no <graphics> are configured. Unfortunately
> this has massive test suite fallout.
> @@ -7559,9 +7559,13 @@ qemuBuildCommandLine(virConnectPtr conn,
>       * if you ask for nographic. So we have to make sure we override
>       * these defaults ourselves...
>       */
> -    if (!def->graphics)
> +    if (!def->graphics) {
>          virCommandAddArg(cmd, "-nographic");
> +        /* trying to talk directly to pulseaudio is generally problematic */
> +        virCommandAddEnvString(cmd, "QEMU_AUDIO_DRV=none");
> +    }

We do something similar with VNC by default, but we have a global qemu.conf
override for that.

    /* Unless user requested it, set the audio backend to none, to
     * prevent it opening the host OS audio devices, since that causes
     * security issues and might not work when using VNC.
    if (cfg->vncAllowHostAudio)
        virCommandAddEnvPass(cmd, "QEMU_AUDIO_DRV");
        virCommandAddEnvString(cmd, "QEMU_AUDIO_DRV=none");

I think we probably want todo the same here, since it is in theory
possible to make pulseaudio work for the QEMU driver.

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