path: root/drivers/s390/cio
diff options
authorEric Farman <farman@linux.ibm.com>2019-05-15 01:42:42 +0200
committerCornelia Huck <cohuck@redhat.com>2019-06-03 12:02:55 +0200
commit15f0eb3d6a62b22b27449329f04ee9aa0d218c6a (patch)
tree452124d08be1ea5b814f6bd661fd86c42161925a /drivers/s390/cio
parentMAINTAINERS: add Vasily Gorbik and Christian Borntraeger for s390 (diff)
s390/cio: Update SCSW if it points to the end of the chain
Per the POPs [1], when processing an interrupt the SCSW.CPA field of an IRB generally points to 8 bytes after the last CCW that was executed (there are exceptions, but this is the most common behavior). In the case of an error, this points us to the first un-executed CCW in the chain. But in the case of normal I/O, the address points beyond the end of the chain. While the guest generally only cares about this when possibly restarting a channel program after error recovery, we should convert the address even in the good scenario so that we provide a consistent, valid, response upon I/O completion. [1] Figure 16-6 in SA22-7832-11. The footnotes in that table also state that this is true even if the resulting address is invalid or protected, but moving to the end of the guest chain should not be a surprise. Signed-off-by: Eric Farman <farman@linux.ibm.com> Message-Id: <20190514234248.36203-2-farman@linux.ibm.com> Reviewed-by: Farhan Ali <alifm@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'drivers/s390/cio')
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index 0e79799e9a71..6e48b66ae31a 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -886,7 +886,11 @@ void cp_update_scsw(struct channel_program *cp, union scsw *scsw)
list_for_each_entry(chain, &cp->ccwchain_list, next) {
ccw_head = (u32)(u64)chain->ch_ccw;
- if (is_cpa_within_range(cpa, ccw_head, chain->ch_len)) {
+ /*
+ * On successful execution, cpa points just beyond the end
+ * of the chain.
+ */
+ if (is_cpa_within_range(cpa, ccw_head, chain->ch_len + 1)) {
* (cpa - ccw_head) is the offset value of the host
* physical ccw to its chain head.