[Xen-devel] [RFC 12/16] xen/arm: Rework p2m_cache_flush to take a range [begin, end)

[Julien Grall <julien.grall@xxxxxxx>]

The function will be easier to re-use in a follow-up patch if you have
only the begin and end.

At the same time, rename the function to reflect the change in the
prototype.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/domctl.c     | 2 +-
 xen/arch/arm/p2m.c        | 3 +--
 xen/include/asm-arm/p2m.h | 7 +++++--
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/xen/arch/arm/domctl.c b/xen/arch/arm/domctl.c
index 4587c75826..c10f568aad 100644
--- a/xen/arch/arm/domctl.c
+++ b/xen/arch/arm/domctl.c
@@ -61,7 +61,7 @@ long arch_do_domctl(struct xen_domctl *domctl, struct domain 
*d,
         if ( e < s )
             return -EINVAL;
 
-        return p2m_cache_flush(d, _gfn(s), domctl->u.cacheflush.nr_pfns);
+        return p2m_cache_flush_range(d, _gfn(s), _gfn(e));
     }
     case XEN_DOMCTL_bind_pt_irq:
     {
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index af445d3313..8537b7bab1 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1507,10 +1507,9 @@ int relinquish_p2m_mapping(struct domain *d)
     return rc;
 }
 
-int p2m_cache_flush(struct domain *d, gfn_t start, unsigned long nr)
+int p2m_cache_flush_range(struct domain *d, gfn_t start, gfn_t end)
 {
     struct p2m_domain *p2m = p2m_get_hostp2m(d);
-    gfn_t end = gfn_add(start, nr);
     gfn_t next_gfn;
     p2m_type_t t;
     unsigned int order;
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index c03557544a..d7afa2bbe8 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -224,8 +224,11 @@ int p2m_set_entry(struct p2m_domain *p2m,
                   p2m_type_t t,
                   p2m_access_t a);
 
-/* Clean & invalidate caches corresponding to a region of guest address space 
*/
-int p2m_cache_flush(struct domain *d, gfn_t start, unsigned long nr);
+/*
+ * Clean & invalidate caches corresponding to a region [start,end) of guest
+ * address space.
+ */
+int p2m_cache_flush_range(struct domain *d, gfn_t start, gfn_t end);
 
 /*
  * Map a region in the guest p2m with a specific p2m type.
-- 
2.11.0


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