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[PATCH v2 0/1] s390x: css: report errors from ccw_dstream_read/write
From: |
Pierre Morel |
Subject: |
[PATCH v2 0/1] s390x: css: report errors from ccw_dstream_read/write |
Date: |
Thu, 8 Apr 2021 18:32:08 +0200 |
By checking the results of errors on SSCH in the kvm-unit-tests
We noticed that no error was reported when a SSCH is started
to access addresses not existing in the guest.
For exemple accessing 3G on a guest with 1G memory.
If we look at QEMU ccw_dstream_write/write functions we see that they
are often not checked for error in various places.
It follows that accessing an invalid address does not trigger a
subchannel status program check to the guest as it should.
Regards,
Pierre
Pierre Morel (1):
s390x: css: report errors from ccw_dstream_read/write
hw/char/terminal3270.c | 11 +++++--
hw/s390x/3270-ccw.c | 5 +++-
hw/s390x/css.c | 14 +++++----
hw/s390x/virtio-ccw.c | 66 ++++++++++++++++++++++++++++++------------
4 files changed, 69 insertions(+), 27 deletions(-)
--
2.17.1
changelog:
from v1:
- handle_payload_3270_read, return CSS error on CSS access errors
keep returning -EIO for other 3270 internal errors.
(Connie)
- css_interpret_ccw, let CSS handle the residual count even on errors
it is supposed to do it right.
(Connie)