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vfio-ccw: support async command subregion

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A vfio-ccw device may provide an async command subregion for
issuing halt/clear subchannel requests. If it is present, use
it for sending halt/clear request to the device; if not, fall
back to emulation (as done today).

Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Message-Id: <20190613092542.2834-1-cohuck@redhat.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cornelia Huck 2019-05-07 17:47:33 +02:00
parent b5e89f044d
commit 8fadea24de
5 changed files with 159 additions and 6 deletions
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3
include/hw/s390x/css.h
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@ -215,6 +215,9 @@ IOInstEnding s390_ccw_cmd_request(SubchDev *sch);
IOInstEnding do_subchannel_work_virtual(SubchDev *sub);
IOInstEnding do_subchannel_work_passthrough(SubchDev *sub);
int s390_ccw_halt(SubchDev *sch);
int s390_ccw_clear(SubchDev *sch);
typedef enum {
CSS_IO_ADAPTER_VIRTIO = 0,
CSS_IO_ADAPTER_PCI = 1,