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vfio-ccw: allow non-prefetch ORBs 

Remove the explicit prefetch check when using vfio-ccw devices.
This check does not trigger in practice as all Linux channel programs
are intended to use prefetch.

Newer Linux kernel versions do not require to force the PFCH flag with
vfio-ccw devices anymore.

Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20200512181535.18630-2-jrossi@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Jared Rossi 2020-05-12 14:15:35 -04:00 committed by Cornelia Huck
parent 61a3d5eded
commit 24e58a7b1d
1 changed files with 3 additions and 10 deletions
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13
hw/vfio/ccw.c
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@ -74,16 +74,9 @@ static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
struct ccw_io_region *region = vcdev->io_region;
int ret;
if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH)) {
if (!(vcdev->force_orb_pfch)) {
warn_once_pfch(vcdev, sch, "requires PFCH flag set");
sch_gen_unit_exception(sch);
css_inject_io_interrupt(sch);
return IOINST_CC_EXPECTED;
} else {
sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
warn_once_pfch(vcdev, sch, "PFCH flag forced");
}
if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
warn_once_pfch(vcdev, sch, "PFCH flag forced");
}
QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));