[Xen-devel] [PATCH RESEND v5 2/6] xen/arm: Implement get_maximum_gpfn hypercall for arm

[Jaeyong Yoo <jaeyong.yoo@xxxxxxxxxxx>]

From: Evgeny Fedotov <e.fedotov@xxxxxxxxxxx>

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

Changes from v4: Use GUEST_RAM_BASE as the start physical address of guest
RAM. And, purge set-memory-map patch

Singed-off-by: Evgeny Fedotov <e.fedotov@xxxxxxxxxxx>
---
 xen/arch/arm/mm.c        | 22 +++++++++++++++++++++-
 xen/include/asm-arm/mm.h |  2 ++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 123280e..3801f07 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -927,7 +927,11 @@ int page_is_ram_type(unsigned long mfn, unsigned long 
mem_type)
 
 unsigned long domain_get_maximum_gpfn(struct domain *d)
 {
-    return -ENOSYS;
+    paddr_t end;
+
+    get_gma_start_end(d, NULL, &end);
+
+    return (unsigned long) (end >> PAGE_SHIFT);
 }
 
 void share_xen_page_with_guest(struct page_info *page,
@@ -1308,6 +1312,22 @@ int is_iomem_page(unsigned long mfn)
         return 1;
     return 0;
 }
+
+/* Guest RAM base */
+#define GUEST_RAM_BASE 0x80000000
+/*
+ *  XXX: Use correct definition for RAM base when the following patch
+ *  xen: arm: 64-bit guest support and domU FDT autogeneration
+ *  will be upstreamed.
+ */
+void get_gma_start_end(struct domain *d, paddr_t *start, paddr_t *end)
+{
+    if ( start )
+        *start = GUEST_RAM_BASE;
+    if ( end )
+        *end = GUEST_RAM_BASE + ((paddr_t) d->max_pages << PAGE_SHIFT);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index ce66099..c5cb3af 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -341,6 +341,8 @@ static inline void put_page_and_type(struct page_info *page)
     put_page(page);
 }
 
+void get_gma_start_end(struct domain *d, paddr_t *start, paddr_t *end);
+
 #endif /*  __ARCH_ARM_MM__ */
 /*
  * Local variables:
-- 
1.8.1.2


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