s390x: always provide pci support

We tried to make pci support optional on s390x in the past; unfortunately, we still require the s390 phb to be created unconditionally due to backwards compatibility issues. Instead of sinking more effort into this (including compat handling for older machines etc.) for non-obvious gains, let's just make CONFIG_PCI something that is always set on s390x. Note that you can still fence off pci for the _guest_ if you provide a cpu model without the zpci feature. Message-Id: <20190211113255.3837-1-cohuck@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
qemu · Feb 18, 2019 · 09ced81 · 09ced81
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commit 09ced81
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Showing 6 changed files with 2 additions and 92 deletions.
diff --git a/hw/s390x/Makefile.objs b/hw/s390x/Makefile.objs
@@ -21,8 +21,7 @@ obj-$(call land,$(CONFIG_VIRTIO_9P),$(CONFIG_VIRTFS)) += virtio-ccw-9p.o
 obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock-ccw.o
 obj-y += css-bridge.o
 obj-y += ccw-device.o
-obj-$(CONFIG_PCI) += s390-pci-bus.o s390-pci-inst.o
-obj-$(call lnot,$(CONFIG_PCI)) += s390-pci-stub.o
+obj-y += s390-pci-bus.o s390-pci-inst.o
 obj-y += s390-skeys.o
 obj-y += s390-stattrib.o
 obj-y += tod.o

diff --git a/hw/s390x/s390-pci-stub.c b/hw/s390x/s390-pci-stub.c
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
@@ -272,10 +272,6 @@ static void ccw_init(MachineState *machine)
                       machine->initrd_filename, "s390-ccw.img",
                       "s390-netboot.img", true);
 
-    /*
-     * We cannot easily make the pci host bridge conditional as older QEMUs
-     * always created it. Doing so would break migration across QEMU versions.
-     */
     dev = qdev_create(NULL, TYPE_S390_PCI_HOST_BRIDGE);
     object_property_add_child(qdev_get_machine(), TYPE_S390_PCI_HOST_BRIDGE,
                               OBJECT(dev), NULL);

diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
@@ -1314,11 +1314,6 @@ static void register_types(void)
 
     /* init all bitmaps from gnerated data initially */
     s390_init_feat_bitmap(qemu_max_cpu_feat_init, qemu_max_cpu_feat);
-#ifndef CONFIG_USER_ONLY
-    if (!pci_available) {
-        clear_bit(S390_FEAT_ZPCI, qemu_max_cpu_feat);
-    }
-#endif
     for (i = 0; i < ARRAY_SIZE(s390_cpu_defs); i++) {
         s390_init_feat_bitmap(s390_cpu_defs[i].base_init,
                               s390_cpu_defs[i].base_feat);

diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
@@ -598,7 +598,6 @@ static uint16_t qemu_MAX[] = {
     S390_FEAT_STFLE_53,
     /* generates a dependency warning, leave it out for now */
     S390_FEAT_MSA_EXT_5,
-    /* only with CONFIG_PCI */
     S390_FEAT_ZPCI,
 };
 

diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
@@ -2278,9 +2278,7 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
     }
 
     /* We emulate a zPCI bus and AEN, therefore we don't need HW support */
-    if (pci_available) {
-        set_bit(S390_FEAT_ZPCI, model->features);
-    }
+    set_bit(S390_FEAT_ZPCI, model->features);
     set_bit(S390_FEAT_ADAPTER_EVENT_NOTIFICATION, model->features);
 
     if (s390_known_cpu_type(cpu_type)) {