[PATCH RFC 1/5] s390x: move setting of maximum ram size to machine init

From: David Hildenbrand <david@redhat.com>
To: qemu-devel@nongnu.org
Cc: Thomas Huth <thuth@redhat.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Halil Pasic <pasic@linux.ibm.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	qemu-s390x@nongnu.org, David Hildenbrand <david@redhat.com>,
	Claudio Imbrenda <imbrenda@linux.ibm.com>,
	Richard Henderson <rth@twiddle.net>
Subject: [PATCH RFC 1/5] s390x: move setting of maximum ram size to machine init
Date: Wed,  8 Jul 2020 20:51:31 +0200	[thread overview]
Message-ID: <20200708185135.46694-2-david@redhat.com> (raw)
In-Reply-To: <20200708185135.46694-1-david@redhat.com>

As we no longer fixup the maximum ram size in sclp code, let's move
setting the maximum ram size to ccw_init()->s390_memory_init(), which
now looks like a better fit.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/s390x/s390-virtio-ccw.c | 19 ++++++++++++++++---
 hw/s390x/sclp.c            | 20 +-------------------
 2 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 023fd25f2b..2e6d292c23 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -160,13 +160,26 @@ static void virtio_ccw_register_hcalls(void)
                                    virtio_ccw_hcall_early_printk);
 }
 
-static void s390_memory_init(MemoryRegion *ram)
+static void s390_memory_init(MachineState *machine)
 {
     MemoryRegion *sysmem = get_system_memory();
     Error *local_err = NULL;
+    uint64_t hw_limit;
+    int ret;
+
+    /* We have to set the memory limit before adding any regions to sysmem. */
+    ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
+    if (ret == -E2BIG) {
+        error_report("host supports a maximum of %" PRIu64 " GB",
+                     hw_limit / GiB);
+        exit(EXIT_FAILURE);
+    } else if (ret) {
+        error_report("setting the guest size failed");
+        exit(EXIT_FAILURE);
+    }
 
     /* allocate RAM for core */
-    memory_region_add_subregion(sysmem, 0, ram);
+    memory_region_add_subregion(sysmem, 0, machine->ram);
 
     /*
      * Configure the maximum page size. As no memory devices were created
@@ -249,7 +262,7 @@ static void ccw_init(MachineState *machine)
 
     s390_sclp_init();
     /* init memory + setup max page size. Required for the CPU model */
-    s390_memory_init(machine->ram);
+    s390_memory_init(machine);
 
     /* init CPUs (incl. CPU model) early so s390_has_feature() works */
     s390_init_cpus(machine);
diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index d39f6d7785..f59195e15a 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -327,32 +327,14 @@ void s390_sclp_init(void)
 
 static void sclp_realize(DeviceState *dev, Error **errp)
 {
-    MachineState *machine = MACHINE(qdev_get_machine());
     SCLPDevice *sclp = SCLP(dev);
-    Error *err = NULL;
-    uint64_t hw_limit;
-    int ret;
 
     /*
      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
      * as we can't find a fitting bus via the qom tree, we have to add the
      * event facility to the sysbus, so e.g. a sclp console can be created.
      */
-    sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), &err);
-    if (err) {
-        goto out;
-    }
-
-    ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
-    if (ret == -E2BIG) {
-        error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
-                   hw_limit / GiB);
-    } else if (ret) {
-        error_setg(&err, "setting the guest size failed");
-    }
-
-out:
-    error_propagate(errp, err);
+    sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp);
 }
 
 static void sclp_memory_init(SCLPDevice *sclp)
-- 
2.26.2


