Handle interception of the CHSC SEI instruction for requests
indicating the guest's AP configuration has changed.
If configuring --without-default-devices, hw/s390x/ap-stub.c
was created to handle such circumstance. Also added the
following to hw/s390x/meson.build if CONFIG_VFIO_AP is
false, it will use the stub file.
Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
---
MAINTAINERS | 1 +
hw/s390x/ap-stub.c | 25 +++++++++++++++++++++++++
hw/s390x/meson.build | 1 +
target/s390x/ioinst.c | 11 +++++++++--
4 files changed, 36 insertions(+), 2 deletions(-)
create mode 100644 hw/s390x/ap-stub.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 23174b4ca7..070c746c69 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -112,6 +112,7 @@ F: hw/intc/s390_flic.c
F: hw/intc/s390_flic_kvm.c
F: hw/s390x/
F: hw/vfio/ap.c
+F: hw/s390x/ap-stub.c
F: hw/vfio/ccw.c
F: hw/watchdog/wdt_diag288.c
F: include/hw/s390x/
diff --git a/hw/s390x/ap-stub.c b/hw/s390x/ap-stub.c
new file mode 100644
index 0000000000..e2dacff959
--- /dev/null
+++ b/hw/s390x/ap-stub.c
@@ -0,0 +1,25 @@
+/*
+ * VFIO based AP matrix device assignment
+ *
+ * Copyright 2025 IBM Corp.
+ * Author(s): Rorie Reyes <rreyes@linux.ibm.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/s390x/ap-bridge.h"
+
+int ap_chsc_sei_nt0_get_event(void *res)
+{
+ return 0;
+}
+
+int ap_chsc_sei_nt0_have_event(void)
+{
+ return 0;
+}
diff --git a/hw/s390x/meson.build b/hw/s390x/meson.build
index 3bbebfd817..99cbcbd7d6 100644
--- a/hw/s390x/meson.build
+++ b/hw/s390x/meson.build
@@ -33,6 +33,7 @@ s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true: files(
))
s390x_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('3270-ccw.c'))
s390x_ss.add(when: 'CONFIG_VFIO', if_true: files('s390-pci-vfio.c'))
+s390x_ss.add(when: 'CONFIG_VFIO_AP', if_false: files('ap-stub.c'))
virtio_ss = ss.source_set()
virtio_ss.add(files('virtio-ccw.c'))
diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c
index fe62ba5b06..2320dd4c12 100644
--- a/target/s390x/ioinst.c
+++ b/target/s390x/ioinst.c
@@ -18,6 +18,7 @@
#include "trace.h"
#include "hw/s390x/s390-pci-bus.h"
#include "target/s390x/kvm/pv.h"
+#include "hw/s390x/ap-bridge.h"
/* All I/O instructions but chsc use the s format */
static uint64_t get_address_from_regs(CPUS390XState *env, uint32_t ipb,
@@ -574,13 +575,19 @@ out:
static int chsc_sei_nt0_get_event(void *res)
{
- /* no events yet */
+ if (s390_has_feat(S390_FEAT_AP)) {
+ return ap_chsc_sei_nt0_get_event(res);
+ }
+
return 1;
}
static int chsc_sei_nt0_have_event(void)
{
- /* no events yet */
+ if (s390_has_feat(S390_FEAT_AP)) {
+ return ap_chsc_sei_nt0_have_event();
+ }
+
return 0;
}