[PATCH v3 8/8] xen/arm: p2m_cache_flush: Use the correct terminology and typesafe gfn

[Julien Grall <julien.grall@arm.com>]

p2m_cache_flush is expecting GFNs in parameter and not MFNs. Rename
the variable to *gfn* and use typesafe to avoid possible misusage.

Note that the type of the parameters 'start' and 'end' is changed
from xen_pfn_t (aka uint64_t) to gfn_t (aka unsigned long). This
means that a truncation will occur for ARM32. It is fine because it
will always be encoded on 28 bits maximum (40 bits address).

Signed-off-by: Julien Grall <julien.grall@arm.com>

---
    Changes in v3:
        - Add a word in the commit message about the truncation.

    Changes in v2:
        - Drop _gfn suffix
---
 xen/arch/arm/domctl.c     |  2 +-
 xen/arch/arm/p2m.c        | 10 +++++-----
 xen/include/asm-arm/p2m.h |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/xen/arch/arm/domctl.c b/xen/arch/arm/domctl.c
index 30453d8..b94e97c 100644
--- a/xen/arch/arm/domctl.c
+++ b/xen/arch/arm/domctl.c
@@ -30,7 +30,7 @@ long arch_do_domctl(struct xen_domctl *domctl, struct domain *d,
         if ( e < s )
             return -EINVAL;
 
-        return p2m_cache_flush(d, s, e);
+        return p2m_cache_flush(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 f3330dd..9149981 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1469,16 +1469,16 @@ int relinquish_p2m_mapping(struct domain *d)
                               d->arch.p2m.default_access);
 }
 
-int p2m_cache_flush(struct domain *d, xen_pfn_t start_mfn, xen_pfn_t end_mfn)
+int p2m_cache_flush(struct domain *d, gfn_t start, gfn_t end)
 {
     struct p2m_domain *p2m = &d->arch.p2m;
 
-    start_mfn = MAX(start_mfn, p2m->lowest_mapped_gfn);
-    end_mfn = MIN(end_mfn, p2m->max_mapped_gfn);
+    start = gfn_max(start, _gfn(p2m->lowest_mapped_gfn));
+    end = gfn_min(end, _gfn(p2m->max_mapped_gfn));
 
     return apply_p2m_changes(d, CACHEFLUSH,
-                             pfn_to_paddr(start_mfn),
-                             pfn_to_paddr(end_mfn),
+                             pfn_to_paddr(gfn_x(start)),
+                             pfn_to_paddr(gfn_x(end)),
                              pfn_to_paddr(INVALID_MFN),
                              MATTR_MEM, 0, p2m_invalid,
                              d->arch.p2m.default_access);
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index f204482..976e51e 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -139,7 +139,7 @@ void p2m_dump_info(struct domain *d);
 mfn_t p2m_lookup(struct domain *d, gfn_t gfn, p2m_type_t *t);
 
 /* Clean & invalidate caches corresponding to a region of guest address space */
-int p2m_cache_flush(struct domain *d, xen_pfn_t start_mfn, xen_pfn_t end_mfn);
+int p2m_cache_flush(struct domain *d, gfn_t start, gfn_t end);
 
 /* Setup p2m RAM mapping for domain d from start-end. */
 int p2m_populate_ram(struct domain *d, paddr_t start, paddr_t end);
-- 
1.9.1


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