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s390x/css: Refactor IRB construction

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Currently, all subchannel types have "sense data" copied into
the IRB.ECW space, and a couple flags enabled in the IRB.SCSW
and IRB.ESW. But for passthrough (vfio-ccw) subchannels,
this data isn't populated in the first place, so enabling
those flags leads to unexpected behavior if the guest tries to
process the sense data (zeros) in the IRB.ECW.

Let's add a subchannel callback that builds these portions of
the IRB, and move the existing code into a routine for those
virtual subchannels. The passthrough subchannels will be able
to piggy-back onto this later.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20210617232537.1337506-4-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Eric Farman 2021-06-18 01:25:36 +02:00 • committed by Cornelia Huck
parent 1b01dedaed
commit 0599a046ac
4 changed files with 33 additions and 16 deletions
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1
hw/s390x/virtio-ccw.c
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@ -753,6 +753,7 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
sch->id.reserved = 0xff;
sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
sch->do_subchannel_work = do_subchannel_work_virtual;
sch->irb_cb = build_irb_virtual;
ccw_dev->sch = sch;
dev->indicators = NULL;
dev->revision = -1;