mirror of https://github.com/proxmox/mirror_qemu
s390x/css: only suspend when enabled by orb
We must not allow a channel program to suspend if the suspend control bit in the orb had not been specified. Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>master
parent
d90527178c
commit
ce350f32e4
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@ -342,7 +342,8 @@ static CCW1 copy_ccw_from_guest(hwaddr addr, bool fmt1)
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return ret;
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return ret;
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}
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}
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static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
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static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
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bool suspend_allowed)
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{
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{
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int ret;
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int ret;
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bool check_len;
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bool check_len;
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@ -370,7 +371,7 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr)
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}
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}
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if (ccw.flags & CCW_FLAG_SUSPEND) {
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if (ccw.flags & CCW_FLAG_SUSPEND) {
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return -EINPROGRESS;
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return suspend_allowed ? -EINPROGRESS : -EINVAL;
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}
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}
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check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
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check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
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@ -468,6 +469,7 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
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SCSW *s = &sch->curr_status.scsw;
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SCSW *s = &sch->curr_status.scsw;
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int path;
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int path;
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int ret;
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int ret;
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bool suspend_allowed;
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/* Path management: In our simple css, we always choose the only path. */
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/* Path management: In our simple css, we always choose the only path. */
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path = 0x80;
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path = 0x80;
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@ -487,12 +489,15 @@ static void sch_handle_start_func(SubchDev *sch, ORB *orb)
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}
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}
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sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT);
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sch->ccw_fmt_1 = !!(orb->ctrl0 & ORB_CTRL0_MASK_FMT);
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sch->ccw_no_data_cnt = 0;
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sch->ccw_no_data_cnt = 0;
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suspend_allowed = !!(orb->ctrl0 & ORB_CTRL0_MASK_SPND);
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} else {
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} else {
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s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND);
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s->ctrl &= ~(SCSW_ACTL_SUSP | SCSW_ACTL_RESUME_PEND);
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/* The channel program had been suspended before. */
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suspend_allowed = true;
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}
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}
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sch->last_cmd_valid = false;
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sch->last_cmd_valid = false;
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do {
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do {
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ret = css_interpret_ccw(sch, sch->channel_prog);
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ret = css_interpret_ccw(sch, sch->channel_prog, suspend_allowed);
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switch (ret) {
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switch (ret) {
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case -EAGAIN:
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case -EAGAIN:
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/* ccw chain, continue processing */
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/* ccw chain, continue processing */
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