[PATCH v3 04/10] xen/arm: Implement get_maximum_gpfn hypercall for arm

[Jaeyong Yoo <jaeyong.yoo@samsung.com>]

From: Evgeny Fedotov <e.fedotov@samsung.com>

By using the memory map info in arch_domain (from set_memory_map hypercall)
implement get_maximum_gpfn hypercall.

Singed-off-by: Evgeny Fedotov <e.fedotov@samsung.com>
---
 xen/arch/arm/mm.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 3c83447..9d5d3e0 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -762,7 +762,16 @@ int page_is_ram_type(unsigned long mfn, unsigned long mem_type)
 
 unsigned long domain_get_maximum_gpfn(struct domain *d)
 {
-    return -ENOSYS;
+    xen_pfn_t max = 0;
+    int nr_banks;
+
+    spin_lock(&d->arch.map_lock);
+    nr_banks = d->arch.map_domain.nr_banks;
+    if ( nr_banks )
+        max = (d->arch.map_domain.bank[nr_banks - 1].start +
+            d->arch.map_domain.bank[nr_banks - 1].size) >> PAGE_SHIFT;
+    spin_unlock(&d->arch.map_lock);
+    return (unsigned long) max;
 }
 
 void share_xen_page_with_guest(struct page_info *page,
-- 
1.8.1.2