[Qemu-devel] [PATCH 6/8] [PATCH RFC v2] s390-qemu: cpu hotplug - Storage key Global Access

["Jason J. Herne" <jjherne@us.ibm.com>]

From: "Jason J. Herne" <jjherne@us.ibm.com>

In preparation for treating cpus as devices we refactor the code such that cpu
initialization no longer relies on cpu 0 to obtain a pointer to the storage key
data.  This patch introduces global access to that data.

Signed-off-by: Jason J. Herne <jjherne@us.ibm.com>
---
 hw/s390x/s390-virtio-ccw.c |    5 ++---
 hw/s390x/s390-virtio.c     |   21 ++++++++++++++++-----
 hw/s390x/s390-virtio.h     |    2 +-
 target-s390x/cpu.h         |    3 +++
 4 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index eb774d9..70bd858 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -65,7 +65,6 @@ static void ccw_init(QEMUMachineInitArgs *args)
     MemoryRegion *sysmem = get_system_memory();
     MemoryRegion *ram = g_new(MemoryRegion, 1);
     int shift = 0;
-    uint8_t *storage_keys;
     int ret;
     VirtualCssBus *css_bus;
 
@@ -94,10 +93,10 @@ static void ccw_init(QEMUMachineInitArgs *args)
     memory_region_add_subregion(sysmem, 0, ram);
 
     /* allocate storage keys */
-    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
+    s390_set_storage_keys_p(g_malloc0(my_ram_size / TARGET_PAGE_SIZE));
 
     /* init CPUs */
-    s390_init_cpus(args->cpu_model, storage_keys);
+    s390_init_cpus(args->cpu_model);
 
     if (kvm_enabled()) {
         kvm_s390_enable_css_support(s390_cpu_addr2state(0));
diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c
index ef4f1ae..4af2d86 100644
--- a/hw/s390x/s390-virtio.c
+++ b/hw/s390x/s390-virtio.c
@@ -136,6 +136,18 @@ static void s390_virtio_register_hcalls(void)
                                    s390_virtio_hcall_set_status);
 }
 
+static uint8_t *storage_keys;
+
+uint8_t *s390_get_storage_keys_p(void)
+{
+    return storage_keys;
+}
+
+void s390_set_storage_keys_p(uint8_t *keys_p)
+{
+    storage_keys = keys_p;
+}
+
 /*
  * The number of running CPUs. On s390 a shutdown is the state of all CPUs
  * being either stopped or disabled (for interrupts) waiting. We have to
@@ -189,7 +201,7 @@ void s390_init_ipl_dev(const char *kernel_filename,
     qdev_init_nofail(dev);
 }
 
-void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
+void s390_init_cpus(const char *cpu_model)
 {
     int i;
 
@@ -209,7 +221,7 @@ void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys)
         ipi_states[i] = cpu;
         cs->halted = 1;
         cpu->env.exception_index = EXCP_HLT;
-        cpu->env.storage_keys = storage_keys;
+        cpu->env.storage_keys = s390_get_storage_keys_p();
     }
 }
 
@@ -244,7 +256,6 @@ static void s390_init(QEMUMachineInitArgs *args)
     MemoryRegion *sysmem = get_system_memory();
     MemoryRegion *ram = g_new(MemoryRegion, 1);
     int shift = 0;
-    uint8_t *storage_keys;
     void *virtio_region;
     hwaddr virtio_region_len;
     hwaddr virtio_region_start;
@@ -283,10 +294,10 @@ static void s390_init(QEMUMachineInitArgs *args)
                               virtio_region_len);
 
     /* allocate storage keys */
-    storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
+    s390_set_storage_keys_p(g_malloc0(my_ram_size / TARGET_PAGE_SIZE));
 
     /* init CPUs */
-    s390_init_cpus(args->cpu_model, storage_keys);
+    s390_init_cpus(args->cpu_model);
 
     /* Create VirtIO network adapters */
     s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390");
diff --git a/hw/s390x/s390-virtio.h b/hw/s390x/s390-virtio.h
index 5c405e7..c1cb042 100644
--- a/hw/s390x/s390-virtio.h
+++ b/hw/s390x/s390-virtio.h
@@ -20,7 +20,7 @@
 typedef int (*s390_virtio_fn)(const uint64_t *args);
 void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn);
 
-void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys);
+void s390_init_cpus(const char *cpu_model);
 void s390_init_ipl_dev(const char *kernel_filename,
                        const char *kernel_cmdline,
                        const char *initrd_filename,
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 029d0c5..a4b87bf 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -393,6 +393,9 @@ uint16_t s390_cpu_get_free_state_idx(void);
 void s390_add_running_cpu(S390CPU *cpu);
 unsigned s390_del_running_cpu(S390CPU *cpu);
 
+uint8_t *s390_get_storage_keys_p(void);
+void s390_set_storage_keys_p(uint8_t *keys_p);
+
 /* service interrupts are floating therefore we must not pass an cpustate */
 void s390_sclp_extint(uint32_t parm);
 
-- 
1.7.10.4