s390x/css: Add passthrough IRB

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>

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 1a3aad516363c5fd0b8aca72015838016cf2d206..133ddea5757e8bec8fee5cc0431328ca445546ce 100644 (file)
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1335,7 +1335,7 @@ 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);
@@ -1650,6 +1650,20 @@ 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 c227c77984cec2aeff9a79da20be3b97ec79eaf3..2fc8bb9c232739b6b7118c6a41f4d688c53d03a0 100644 (file)
--- a/hw/s390x/s390-ccw.c
+++ b/hw/s390x/s390-ccw.c
@@ -124,6 +124,7 @@ 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 139a3d9d1b950c5309368373ed4407f8e821372d..000992fb9fb6df8761a31cc52b41c4f696ddecae 100644 (file)
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -321,6 +321,7 @@ 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)) {
@@ -371,6 +372,9 @@ 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 7c23a13f3d3dc3a4d0116ec286cf1bd9cddbe9b7..10ed1df1bb74b313656eae4bcd6ba10837ad10af 100644 (file)
--- 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);