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Re: [Xen-devel] [PATCH 20/24] xen/arm: mm: Redefine virt_to_mfn to support typesafe
Hi Stefano,
On 16/06/2017 00:44, Stefano Stabellini wrote:
On Tue, 13 Jun 2017, Julien Grall wrote:
The file xen/arch/arm/mm.c is using the typesafe MFN in most of the
place. This requires all caller of virt_to_mfn to prefixed by _mfn(...).
To avoid the extra _mfn(...), re-defined virt_to_mfn within arch/arm/mm.c
to handle typesafe MFN.
This patch also introduce __virt_to_mfn, so virt_to_mfn can be
re-defined easily.
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
---
xen/arch/arm/mm.c | 16 ++++++++++------
xen/include/asm-arm/mm.h | 3 ++-
2 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 452c1e26c3..2ff1688f3f 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -44,6 +44,10 @@
struct domain *dom_xen, *dom_io, *dom_cow;
+/* Override macros from asm/page.h to make them work with mfn_t */
+#undef virt_to_mfn
+#define virt_to_mfn(va) _mfn(__virt_to_mfn(va))
+
/* Static start-of-day pagetables that we use before the allocators
* are up. These are used by all CPUs during bringup before switching
* to the CPUs own pagetables.
@@ -479,7 +483,7 @@ unsigned long domain_page_map_to_mfn(const void *ptr)
unsigned long offset = (va>>THIRD_SHIFT) & LPAE_ENTRY_MASK;
if ( va >= VMAP_VIRT_START && va < VMAP_VIRT_END )
- return virt_to_mfn(va);
+ return mfn_x(virt_to_mfn(va));
__virt_to_mfn?
Ok.
Cheers,
--
Julien Grall
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