[Xen-devel] [RFC v2 2/6] xen/arm: implement support for XENMEM_maximum_gpfn hypercall

[Wei Huang <w1.huang@xxxxxxxxxxx>]

From: Jaeyong Yoo <jaeyong.yoo@xxxxxxxxxxx>

This patch implements ddomain_get_maximum_gpfn by using max_mapped_gfn
field of P2M struct. A support function to retrieve guest VM pfn range
is also added.

Signed-off-by: Evgeny Fedotov <e.fedotov@xxxxxxxxxxx>
Signed-off-by: Wei Huang <w1.huang@xxxxxxxxxxx>
---
 xen/arch/arm/mm.c        |   21 ++++++++++++++++++++-
 xen/include/asm-arm/mm.h |    1 +
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 362bc8d..473ad04 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -947,7 +947,11 @@ 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;
+
+    domain_get_gpfn_range(d, NULL, &end);
+
+    return (unsigned long)end;
 }
 
 void share_xen_page_with_guest(struct page_info *page,
@@ -1235,6 +1239,21 @@ int is_iomem_page(unsigned long mfn)
         return 1;
     return 0;
 }
+
+/*
+ * Return start and end addresses of guest VM
+ */
+void domain_get_gpfn_range(struct domain *d, paddr_t *start, paddr_t *end)
+{
+    struct p2m_domain *p2m = &d->arch.p2m;
+
+    if ( start )
+        *start = GUEST_RAM_BASE;
+
+    if ( end )
+        *end = GUEST_RAM_BASE + ((paddr_t) p2m->max_mapped_gfn);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index b8d4e7d..8347524 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -319,6 +319,7 @@ int donate_page(
 #define domain_set_alloc_bitsize(d) ((void)0)
 #define domain_clamp_alloc_bitsize(d, b) (b)
 
+void domain_get_gpfn_range(struct domain *d, paddr_t *start, paddr_t *end);
 unsigned long domain_get_maximum_gpfn(struct domain *d);
 
 extern struct domain *dom_xen, *dom_io, *dom_cow;
-- 
1.7.9.5


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