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s390x: add css_migration_enabled to machine class

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Currently the migration of the channel subsystem (css) is only partial
and is done by the virtio ccw proxies -- the only migratable css devices
existing at the moment.

With the current work on emulated and passthrough devices we need to
decouple the migration of the channel subsystem state from virtio ccw,
and have a separate section for it. A new section  however necessarily
breaks the migration compatibility.

So let us introduce a switch at the machine class, and put it in 'off'
state for now. We will turn the switch 'on' for future machines once all
preparations are met. For compatibility  machines the switch will stay
'off'.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Message-Id: <20170711145441.33925-3-pasic@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Halil Pasic 2017-07-11 16:54:37 +02:00 • committed by Christian Borntraeger
parent cec8bbf7d6
commit 52629b3ba8
2 changed files with 20 additions and 0 deletions
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7
include/hw/s390x/s390-virtio-ccw.h
View file

@ -39,6 +39,7 @@ typedef struct S390CcwMachineClass {
/*< public >*/
bool ri_allowed;
bool cpu_model_allowed;
bool css_migration_enabled;
} S390CcwMachineClass;
/* runtime-instrumentation allowed by the machine */
@ -46,4 +47,10 @@ bool ri_allowed(void);
/* cpu model allowed by the machine */
bool cpu_model_allowed(void);
/**
* Returns true if (vmstate based) migration of the channel subsystem
* is enabled, false if it is disabled.
*/
bool css_migration_enabled(void);
#endif