From 4eb1f0936bfc921cad9af37f1573075148843b1d Mon Sep 17 00:00:00 2001
From: Eric Farman <farman@linux.ibm.com>
Date: Thu, 24 Jun 2021 14:15:16 -0400
Subject: [PATCH 04/43] s390x/css: Add passthrough IRB

RH-Author: Miroslav Rezanina <mrezanin@redhat.com>
RH-Bugzilla: 1957194

Wire in the subchannel callback for building the IRB
ESW and ECW space for passthrough devices, and copy
the hardware's ESW into the IRB we are building.

If the hardware presented concurrent sense, then copy
that sense data into the IRB's ECW space.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20210617232537.1337506-5-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit c626710fc755628d0d6b88aab0514c9238a84522)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/s390x/css.c         | 16 +++++++++++++++-
 hw/s390x/s390-ccw.c    |  1 +
 hw/vfio/ccw.c          |  4 ++++
 include/hw/s390x/css.h |  3 +++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index e77a0e523d..c3150da4f7 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1336,7 +1336,7 @@ static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src)
     }
 }
 
-static void copy_esw_to_guest(ESW *dest, const ESW *src)
+void copy_esw_to_guest(ESW *dest, const ESW *src)
 {
     dest->word0 = cpu_to_be32(src->word0);
     dest->erw = cpu_to_be32(src->erw);
@@ -1651,6 +1651,20 @@ static void build_irb_sense_data(SubchDev *sch, IRB *irb)
     }
 }
 
+void build_irb_passthrough(SubchDev *sch, IRB *irb)
+{
+    /* Copy ESW from hardware */
+    irb->esw = sch->esw;
+
+    /*
+     * If (irb->esw.erw & ESW_ERW_SENSE) is true, then the contents
+     * of the ECW is sense data. If false, then it is model-dependent
+     * information. Either way, copy it into the IRB for the guest to
+     * read/decide what to do with.
+     */
+    build_irb_sense_data(sch, irb);
+}
+
 void build_irb_virtual(SubchDev *sch, IRB *irb)
 {
     SCHIB *schib = &sch->curr_status;
diff --git a/hw/s390x/s390-ccw.c b/hw/s390x/s390-ccw.c
index b497571863..39cbea615b 100644
--- a/hw/s390x/s390-ccw.c
+++ b/hw/s390x/s390-ccw.c
@@ -125,6 +125,7 @@ static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
     }
     sch->driver_data = cdev;
     sch->do_subchannel_work = do_subchannel_work_passthrough;
+    sch->irb_cb = build_irb_passthrough;
 
     ccw_dev->sch = sch;
     ret = css_sch_build_schib(sch, &cdev->hostid);
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index b2df708e4b..5f141d44a4 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -322,6 +322,7 @@ static void vfio_ccw_io_notifier_handler(void *opaque)
     SCHIB *schib = &sch->curr_status;
     SCSW s;
     IRB irb;
+    ESW esw;
     int size;
 
     if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
@@ -372,6 +373,9 @@ static void vfio_ccw_io_notifier_handler(void *opaque)
     copy_scsw_to_guest(&s, &irb.scsw);
     schib->scsw = s;
 
+    copy_esw_to_guest(&esw, &irb.esw);
+    sch->esw = esw;
+
     /* If a uint check is pending, copy sense data. */
     if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
         (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
diff --git a/include/hw/s390x/css.h b/include/hw/s390x/css.h
index 7c23a13f3d..10ed1df1bb 100644
--- a/include/hw/s390x/css.h
+++ b/include/hw/s390x/css.h
@@ -141,6 +141,7 @@ struct SubchDev {
     void (*irb_cb)(SubchDev *, IRB *);
     SenseId id;
     void *driver_data;
+    ESW esw;
 };
 
 static inline void sch_gen_unit_exception(SubchDev *sch)
@@ -202,6 +203,7 @@ int css_sch_build_schib(SubchDev *sch, CssDevId *dev_id);
 unsigned int css_find_free_chpid(uint8_t cssid);
 uint16_t css_build_subchannel_id(SubchDev *sch);
 void copy_scsw_to_guest(SCSW *dest, const SCSW *src);
+void copy_esw_to_guest(ESW *dest, const ESW *src);
 void css_inject_io_interrupt(SubchDev *sch);
 void css_reset(void);
 void css_reset_sch(SubchDev *sch);
@@ -216,6 +218,7 @@ void css_clear_sei_pending(void);
 IOInstEnding s390_ccw_cmd_request(SubchDev *sch);
 IOInstEnding do_subchannel_work_virtual(SubchDev *sub);
 IOInstEnding do_subchannel_work_passthrough(SubchDev *sub);
+void build_irb_passthrough(SubchDev *sch, IRB *irb);
 void build_irb_virtual(SubchDev *sch, IRB *irb);
 
 int s390_ccw_halt(SubchDev *sch);
-- 
2.27.0