Use new Xen HVMOP_get_mem_type hvmop hypercall option and new Linux kernel
register_oldmem_pfn_is_ram interface.

Signed-off-by: Olaf Hering <olaf@aepfle.de>

---
 unmodified_drivers/linux-2.6/platform-pci/platform-pci.c |   31 +++++++++++++++
 1 file changed, 31 insertions(+)

Index: xen-4.1.2-testing/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c
===================================================================
--- xen-4.1.2-testing.orig/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c
+++ xen-4.1.2-testing/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c
@@ -30,6 +30,7 @@
 #include <linux/interrupt.h>
 #include <linux/vmalloc.h>
 #include <linux/mm.h>
+#include <linux/crash_dump.h>
 #include <asm/system.h>
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -359,6 +360,32 @@ static int check_platform_magic(struct d
 	return -ENODEV;
 }
 
+#if defined(HAVE_OLDMEM_PFN_IS_RAM) && defined(HVMOP_get_mem_type)
+static int xen_oldmem_pfn_is_ram(unsigned long pfn)
+{
+	struct xen_hvm_get_mem_type a;
+	int ram;
+
+	a.domid = DOMID_SELF;
+	a.pfn = pfn;
+	if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
+		return -ENXIO;
+
+	switch (a.mem_type) {
+		case HVMMEM_mmio_dm:
+			ram = 0;
+			break;
+		case HVMMEM_ram_rw:
+		case HVMMEM_ram_ro:
+		default:
+			ram = 1;
+			break;
+	}
+
+	return ram;
+}
+#endif
+
 static int __devinit platform_pci_init(struct pci_dev *pdev,
 				       const struct pci_device_id *ent)
 {
@@ -427,6 +454,10 @@ static int __devinit platform_pci_init(s
 	if ((ret = xen_panic_handler_init()))
 		goto out;
 
+#if defined(HAVE_OLDMEM_PFN_IS_RAM) && defined(HVMOP_get_mem_type)
+	register_oldmem_pfn_is_ram(&xen_oldmem_pfn_is_ram);
+#endif
+
  out:
 	if (ret) {
 		pci_release_region(pdev, 0);