From: Paolo Bonzini <pbonzini@redhat.com>
To: "Daniel P. Berrange" <berrange@redhat.com>,
Gerd Hoffmann <kraxel@redhat.com>
Cc: seabios@seabios.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v2 0/3] seabios: add serial console support
Date: Tue, 5 Jul 2016 13:45:10 +0200 [thread overview]
Message-ID: <06b3f67a-a3e8-021b-6b13-33062bd2d259@redhat.com> (raw)
In-Reply-To: <20160705100711.GJ6553@redhat.com>
On 05/07/2016 12:07, Daniel P. Berrange wrote:
>> > What the final default behavior will be is not clear yet. Not enabled?
>> > Enabled in case no VGA is present? Enabled unconditionally (simliar to
>> > ovmf)?
> (Bitter) experiance in libvirt has shown us that magically enabling
> things based on whether or not some other feature is enabled leads
> to pain and suffering in the long term.
>
> So from libvirt's POV, we would like an explicit command line flag
> to turn on/off seabios serial console support, with no dependancy
> on whether VGA is present or not.
With my other proposal, "-machine graphics=no -device sga" should do it.
However, for libvirt to do this, it should stop using "-nographic" to
disable all display backends, and instead use "-display none". The
advantage is that neither "-display none" nor "-machine graphics=no" do
any magic redirection of the monitor and the serial ports to stdio.
"-display none" is supported since QEMU 1.0. For old QEMU without
query-command-line-options it can be scraped from help text; for new
QEMU with query-command-line-options it can be treated as always there.
Paolo
next prev parent reply other threads:[~2016-07-05 11:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-04 20:39 [Qemu-devel] [PATCH v2 0/3] seabios: add serial console support Gerd Hoffmann
2016-07-04 20:39 ` [Qemu-devel] [PATCH 1/3] std: add cp437 to unicode map Gerd Hoffmann
2016-07-05 13:49 ` [Qemu-devel] [SeaBIOS] " Kevin O'Connor
2016-07-04 20:39 ` [Qemu-devel] [PATCH 2/3] kbd: make enqueue_key public, add ascii_to_keycode Gerd Hoffmann
2016-07-04 20:39 ` [Qemu-devel] [PATCH 3/3] add serial console support Gerd Hoffmann
2016-07-05 14:30 ` [Qemu-devel] [SeaBIOS] " Kevin O'Connor
2016-07-05 15:07 ` Gerd Hoffmann
2016-07-05 15:23 ` Kevin O'Connor
2016-07-05 8:06 ` [Qemu-devel] [PATCH v2 0/3] seabios: " Daniel P. Berrange
2016-07-05 10:00 ` Gerd Hoffmann
2016-07-05 10:07 ` Daniel P. Berrange
2016-07-05 11:45 ` Paolo Bonzini [this message]
2016-07-05 11:59 ` Daniel P. Berrange
2016-07-05 11:15 ` Paolo Bonzini
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