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



Hello Wei,

Thank you for the patch.

On 15/04/14 22:05, Wei Huang wrote:
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)

The content of the function doesn't match the name.

This function should return a PFN not an address.
Actually, libxc (i.e the return of domain_get_maximum_gpfn) expect a pfn.

+{
+    struct p2m_domain *p2m = &d->arch.p2m;
+
+    if ( start )
+        *start = GUEST_RAM_BASE;

You can use  p2m->lowest_mapped_gfn here.

+    if ( end )
+        *end = GUEST_RAM_BASE + ((paddr_t) p2m->max_mapped_gfn);

This is wrong, max_mapped_gpfn contains a guest frame number, not a number of frames.

The code should be smth like:

*end = pfn_to_paddr(p2m->max_mapped_gfn);

Regards,

--
Julien Grall

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