x86: allow the MSI-X table to reside beyond 4G even on 32-bit systems

Underlying interfaces allow this, and unduly (and silently) truncating
addresses doesn't seem nice.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
xen-unstable changeset:   21779:08b2222ff505
xen-unstable date:        Mon Jul 12 10:43:57 2010 +0100

1 files changed, 7 insertions, 5 deletions

diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c
index 4f16bf23c4..ec7e5c9c06 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -57,10 +57,11 @@ static void msix_fixmap_free(int idx)
     spin_unlock(&msix_fixmap_lock);
 }
 
-static int msix_get_fixmap(struct pci_dev *dev, unsigned long table_paddr,
-                           unsigned long entry_paddr)
+static int msix_get_fixmap(struct pci_dev *dev, u64 table_paddr,
+                           u64 entry_paddr)
 {
-    int nr_page, idx;
+    long nr_page;
+    int idx;
 
     nr_page = (entry_paddr >> PAGE_SHIFT) - (table_paddr >> PAGE_SHIFT);
 
@@ -536,7 +537,7 @@ static int msix_capability_init(struct pci_dev *dev,
     struct msi_desc *entry;
     int pos;
     u16 control;
-    unsigned long table_paddr, entry_paddr;
+    u64 table_paddr, entry_paddr;
     u32 table_offset, entry_offset;
     u8 bir;
     void __iomem *base;
@@ -571,7 +572,8 @@ static int msix_capability_init(struct pci_dev *dev,
         xfree(entry);
         return idx;
     }
-    base = (void *)(fix_to_virt(idx) + (entry_paddr & ((1UL << PAGE_SHIFT) - 1)));
+    base = (void *)(fix_to_virt(idx) +
+        ((unsigned long)entry_paddr & ((1UL << PAGE_SHIFT) - 1)));
 
     entry->msi_attrib.type = PCI_CAP_ID_MSIX;
     entry->msi_attrib.is_64 = 1;