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[S390] kvm_s390: Fix oops in virtio device detection with "mem=" 

The current virtio model on s390 has the descriptor page above the main
memory. The guest virtio detection will oops if the mem= parameter is
used to reduce/change the memory size.
We have to use real_memory_size instead of max_pfn to detect the virtio
descriptor pages.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2008-11-14 18:18:02 +01:00 committed by Martin Schwidefsky
parent 675be97a32
commit cc835f7872
1 changed files with 2 additions and 2 deletions
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4
drivers/s390/kvm/kvm_virtio.c
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@ -322,13 +322,13 @@ static int __init kvm_devices_init(void)
return rc;
}
rc = vmem_add_mapping(PFN_PHYS(max_pfn), PAGE_SIZE);
rc = vmem_add_mapping(real_memory_size, PAGE_SIZE);
if (rc) {
s390_root_dev_unregister(kvm_root);
return rc;
}
kvm_devices = (void *) PFN_PHYS(max_pfn);
kvm_devices = (void *) real_memory_size;
ctl_set_bit(0, 9);
register_external_interrupt(0x2603, kvm_extint_handler);