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From d5f5a307f3396064d29ef0d300c7377756dd165b Mon Sep 17 00:00:00 2001
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From: Cornelia Huck <cohuck@redhat.com>
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Date: Tue, 23 Jun 2020 09:25:36 -0400
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Subject: [PATCH 02/12] vfio-ccw: allow non-prefetch ORBs
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RH-Author: Cornelia Huck <cohuck@redhat.com>
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Message-id: <20200623092543.358315-3-cohuck@redhat.com>
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Patchwork-id: 97692
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O-Subject: [RHEL-8.3.0 qemu-kvm PATCH 2/9] vfio-ccw: allow non-prefetch ORBs
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Bugzilla: 1660916
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RH-Acked-by: Claudio Imbrenda <cimbrend@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Jared Rossi <jrossi@linux.ibm.com>
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Remove the explicit prefetch check when using vfio-ccw devices.
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This check does not trigger in practice as all Linux channel programs
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are intended to use prefetch.
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Newer Linux kernel versions do not require to force the PFCH flag with
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vfio-ccw devices anymore.
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Signed-off-by: Jared Rossi <jrossi@linux.ibm.com>
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Reviewed-by: Eric Farman <farman@linux.ibm.com>
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Message-Id: <20200512181535.18630-2-jrossi@linux.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 24e58a7b1d411627e326144030a20dcf0093fed0)
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/vfio/ccw.c | 13 +++----------
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1 file changed, 3 insertions(+), 10 deletions(-)
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diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
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index 3b5520ae75..6bc612b5b7 100644
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--- a/hw/vfio/ccw.c
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+++ b/hw/vfio/ccw.c
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@@ -74,16 +74,9 @@ static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
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struct ccw_io_region *region = vcdev->io_region;
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int ret;
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- if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH)) {
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- if (!(vcdev->force_orb_pfch)) {
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- warn_once_pfch(vcdev, sch, "requires PFCH flag set");
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- sch_gen_unit_exception(sch);
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- css_inject_io_interrupt(sch);
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- return IOINST_CC_EXPECTED;
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- } else {
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- sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
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- warn_once_pfch(vcdev, sch, "PFCH flag forced");
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- }
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+ if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
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+ sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
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+ warn_once_pfch(vcdev, sch, "PFCH flag forced");
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}
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QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
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--
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2.27.0
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