s390/kvm: Change the virtual memory mapping location for Virtio devices

The current location for mapping Virtio devices does not take
into consideration of the standby memory. This causes the failure
of mapping standby memory since the location for the mapping is
already taken by the Virtio devices. To fix the problem, we move
the location to beyond the end of standby memory.

Signed-off-by: Nick Wang <jfwang@us.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 6711e65764b5e7a4482564014ac6aa0e78189242..2ea6165366b6f4d8da48f74859aeae3e705f5b7d 100644 (file)
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -443,29 +443,30 @@ static int __init test_devices_support(unsigned long addr)
 }
 /*
  * Init function for virtio
- * devices are in a single page above top of "normal" mem
+ * devices are in a single page above top of "normal" + standby mem
  */
 static int __init kvm_devices_init(void)
 {
        int rc;
+       unsigned long total_memory_size = sclp_get_rzm() * sclp_get_rnmax();
 
        if (!MACHINE_IS_KVM)
                return -ENODEV;
 
-       if (test_devices_support(real_memory_size) < 0)
+       if (test_devices_support(total_memory_size) < 0)
                return -ENODEV;
 
-       rc = vmem_add_mapping(real_memory_size, PAGE_SIZE);
+       rc = vmem_add_mapping(total_memory_size, PAGE_SIZE);
        if (rc)
                return rc;
 
-       kvm_devices = (void *) real_memory_size;
+       kvm_devices = (void *) total_memory_size;
 
        kvm_root = root_device_register("kvm_s390");
        if (IS_ERR(kvm_root)) {
                rc = PTR_ERR(kvm_root);
                printk(KERN_ERR "Could not register kvm_s390 root device");
-               vmem_remove_mapping(real_memory_size, PAGE_SIZE);
+               vmem_remove_mapping(total_memory_size, PAGE_SIZE);
                return rc;
        }