From: Alexander Graf <agraf@suse.de>
To: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>, KVM <kvm@vger.kernel.org>,
linux-s390 <linux-s390@vger.kernel.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Carsten Otte <cotte@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Sebastian Ott <sebott@linux.vnet.ibm.com>
Subject: Re: [PATCH 5/5] KVM: s390: Split out early console code.
Date: Tue, 30 Oct 2012 14:43:10 +0100 [thread overview]
Message-ID: <508FD96E.1010209@suse.de> (raw)
In-Reply-To: <20121030135926.2db07255@BR9GNB5Z>
On 10/30/2012 01:59 PM, Cornelia Huck wrote:
> On Mon, 29 Oct 2012 19:14:19 +0100
> Alexander Graf<agraf@suse.de> wrote:
>
>> On 29.10.2012, at 14:07, Cornelia Huck wrote:
>>
>>> This code is transport agnostic and can be used by both the legacy
>>> virtio code and virtio_ccw.
>> Would it be possible to actually send real virtio or sclp console commands for early printk? That'd make things a lot easier on the user space end. Combining two completely separate character channels (early printk + sclp or early printk + virtio-console) is really tricky.
>>
> This code is only used if we use a virtio console device. The sclp
> code path is completely different.
Ah, so the sclp early console works differently?
> What do you mean with "real virtio console commands"? The message is
> just put on the output queue anyway.
For virtio-console, yes. For the early printk it is sent to the
hypervisor using a hypercall, not through the virtio queue. So it
arrives at a completely different end point that usually has no
knowledge of the virtio-console output driver.
Alex
next prev parent reply other threads:[~2012-10-30 13:43 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-29 13:07 [PATCH 0/5] s390: Guest support for virtio-ccw Cornelia Huck
2012-10-29 13:07 ` [PATCH 1/5] KVM: s390: Handle hosts not supporting s390-virtio Cornelia Huck
2012-10-29 13:07 ` [PATCH 2/5] s390: Move css limits from drivers/s390/cio/ to include/asm/ Cornelia Huck
2012-10-29 13:07 ` [PATCH 3/5] s390: Add a mechanism to get the subchannel id Cornelia Huck
2012-10-29 13:07 ` [PATCH 4/5] KVM: s390: Add a channel I/O based virtio transport driver Cornelia Huck
2012-10-29 18:12 ` Alexander Graf
2012-10-29 18:34 ` Cornelia Huck
2012-10-29 18:37 ` Alexander Graf
2012-10-30 13:03 ` Cornelia Huck
2012-10-30 13:41 ` Alexander Graf
2012-10-30 14:00 ` Cornelia Huck
2012-10-30 14:05 ` Alexander Graf
2012-10-30 14:35 ` Cornelia Huck
2012-10-30 15:11 ` Alexander Graf
2012-10-29 13:07 ` [PATCH 5/5] KVM: s390: Split out early console code Cornelia Huck
2012-10-29 18:14 ` Alexander Graf
2012-10-30 12:59 ` Cornelia Huck
2012-10-30 13:43 ` Alexander Graf [this message]
2012-10-30 14:29 ` Cornelia Huck
2012-10-30 15:12 ` Alexander Graf
2012-10-30 15:35 ` Cornelia Huck
2012-10-30 15:42 ` Alexander Graf
2012-10-29 17:55 ` [PATCH 0/5] s390: Guest support for virtio-ccw Alexander Graf
2012-10-29 18:15 ` Cornelia Huck
2012-10-29 18:33 ` Alexander Graf
2012-10-30 13:04 ` Cornelia Huck
2012-10-30 13:43 ` Alexander Graf
-- strict thread matches above, loose matches on Subject: below --
2012-12-07 12:29 [PATCH v3 " Cornelia Huck
2012-12-07 12:29 ` [PATCH 5/5] KVM: s390: Split out early console code Cornelia Huck
2012-12-09 12:45 ` Alexander Graf
2012-12-10 9:06 ` Cornelia Huck
2012-12-11 10:10 ` Alexander Graf
2012-12-11 12:36 ` Cornelia Huck
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