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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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25
include/hw/s390x/css.h
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@ -192,16 +192,25 @@ extern PropertyInfo css_devid_ro_propinfo;
/**
* Create a subchannel for the given bus id.
*
* If @p bus_id is valid, verify that it uses the virtual channel
* subsystem id and is not already in use, and find a free subchannel
* id for it. If @p bus_id is not valid, find a free subchannel id and
* device number across all subchannel sets. If either of the former
* actions succeed, allocate a subchannel structure, initialise it
* with the bus id, subchannel id and device number, register it with
* the CSS and return it. Otherwise return NULL.
* If @p bus_id is valid, and @p squash_mcss is true, verify that it is
* not already in use in the default css, and find a free devno from the
* default css image for it.
* If @p bus_id is valid, and @p squash_mcss is false, verify that it is
* not already in use, and find a free devno for it.
* If @p bus_id is not valid, and if either @p squash_mcss or @p is_virtual
* is true, find a free subchannel id and device number across all
* subchannel sets from the default css image.
* If @p bus_id is not valid, and if both @p squash_mcss and @p is_virtual
* are false, find a non-full css image and find a free subchannel id and
* device number across all subchannel sets from it.
*
* If either of the former actions succeed, allocate a subchannel structure,
* initialise it with the bus id, subchannel id and device number, register
* it with the CSS and return it. Otherwise return NULL.
*
* The caller becomes owner of the returned subchannel structure and
* is responsible for unregistering and freeing it.
*/
SubchDev *css_create_virtual_sch(CssDevId bus_id, Error **errp);
SubchDev *css_create_sch(CssDevId bus_id, bool is_virtual, bool squash_mcss,
Error **errp);
#endif