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s390x/css: realize css_create_sch

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The S390 virtual css support already has a mechanism to create a
virtual subchannel and provide it to the guest. However, to
pass-through subchannels to a guest, we need to introduce a new
mechanism to create the subchannel according to the real device
information. Thus we reconstruct css_create_virtual_sch to a new
css_create_sch function to handle all these cases and do allocation
and initialization of the subchannel according to the device type
and machine configuration.

Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170517004813.58227-6-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Dong Jia Shi 2017-05-17 02:48:05 +02:00 • committed by Cornelia Huck
parent 8f3cf0128c
commit 817d4a6bc8
7 changed files with 76 additions and 20 deletions
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11
hw/s390x/s390-virtio-ccw.c
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@ -136,10 +136,15 @@ static void ccw_init(MachineState *machine)
kvm_s390_enable_css_support(s390_cpu_addr2state(0));
}
/*
* Create virtual css and set it as default so that non mcss-e
* enabled guests only see virtio devices.
* Non mcss-e enabled guests only see the devices from the default
* css, which is determined by the value of the squash_mcss property.
* Note: we must not squash non virtual devices to css 0xFE.
*/
ret = css_create_css_image(VIRTUAL_CSSID, true);
if (css_bus->squash_mcss) {
ret = css_create_css_image(0, true);
} else {
ret = css_create_css_image(VIRTUAL_CSSID, true);
}
assert(ret == 0);
/* Create VirtIO network adapters */