[PATCH 5/7] virtio: use KVM_S390_VIRTIO_RING_ALIGN instead of relying on pagesize

[Rusty Russell]

This doesn't really matter, since s390 pagesize is 4k anyway.

Signed-off-by: Rusty Russell <[EMAIL PROTECTED]>
---
 arch/s390/include/asm/kvm_virtio.h |    3 +++
 drivers/s390/kvm/kvm_virtio.c      |    9 ++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff -r 5c9c0cc58458 arch/s390/include/asm/kvm_virtio.h
--- a/arch/s390/include/asm/kvm_virtio.h        Wed Nov 12 22:05:59 2008 +1030
+++ b/arch/s390/include/asm/kvm_virtio.h        Wed Nov 12 22:10:29 2008 +1030
@@ -50,6 +50,9 @@
 #define KVM_S390_VIRTIO_RESET          1
 #define KVM_S390_VIRTIO_SET_STATUS     2
 
+/* Overkill: we have the consumer and producer writing to separate pages. */
+#define KVM_S390_VIRTIO_RING_ALIGN     4096
+
 #ifdef __KERNEL__
 /* early virtio console setup */
 #ifdef CONFIG_S390_GUEST
diff -r 5c9c0cc58458 drivers/s390/kvm/kvm_virtio.c
--- a/drivers/s390/kvm/kvm_virtio.c     Wed Nov 12 22:05:59 2008 +1030
+++ b/drivers/s390/kvm/kvm_virtio.c     Wed Nov 12 22:10:29 2008 +1030
@@ -188,7 +188,8 @@
        config = kvm_vq_config(kdev->desc)+index;
 
        err = vmem_add_mapping(config->address,
-                              vring_size(config->num, PAGE_SIZE));
+                              vring_size(config->num,
+                                         KVM_S390_VIRTIO_RING_ALIGN));
        if (err)
                goto out;
 
@@ -209,7 +210,8 @@
        return vq;
 unmap:
        vmem_remove_mapping(config->address,
-                           vring_size(config->num, PAGE_SIZE));
+                           vring_size(config->num,
+                                      KVM_S390_VIRTIO_RING_ALIGN));
 out:
        return ERR_PTR(err);
 }
@@ -220,7 +222,8 @@
 
        vring_del_virtqueue(vq);
        vmem_remove_mapping(config->address,
-                           vring_size(config->num, PAGE_SIZE));
+                           vring_size(config->num,
+                                      KVM_S390_VIRTIO_RING_ALIGN));
 }
 
 /*


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