From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Fri, 14 Nov 2008 17:18:02 +0000 (+0100)
Subject: [S390] kvm_s390: Fix oops in virtio device detection with "mem="
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cc835f7872adef35076e4a3b6632ef79bb4805be;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

[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>
---

diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index ff4a6931bb8e..3d442444c618 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -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);