# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Node ID 6c3d5f671d1760d6d301fe3160156375e8ac39c6
# Parent  d4879708b89968cb860c324c27b69c9d3955fda5
add read only mapping support.
PATCHNAME: read_only_mapping_linux

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r d4879708b899 -r 6c3d5f671d17 linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c
--- a/linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c	Tue May 16 13:25:43 2006 +0900
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c	Tue May 16 13:25:45 2006 +0900
@@ -313,12 +313,6 @@ gnttab_map_grant_ref_pre(struct gnttab_m
 	uint32_t flags;
 
 	flags = uop->flags;
-	if (flags & GNTMAP_readonly) {
-#if 0
-		xprintd("GNTMAP_readonly is not supported yet\n");
-#endif
-		flags &= ~GNTMAP_readonly;
-	}
 
 	if (flags & GNTMAP_host_map) {
 		if (flags & GNTMAP_application_map) {
@@ -400,8 +394,8 @@ xen_ia64_privcmd_entry_mmap(struct vm_ar
 	}
 	gpfn = page_to_pfn(page);
 
-	error = HYPERVISOR_add_physmap(gpfn, mfn, 0/* prot:XXX */,
-				       domid);
+	error = HYPERVISOR_add_physmap(gpfn, mfn,
+				       (pgprot_val(prot) == PROT_READ), domid);
 	if (error != 0) {
 		goto out;
 	}
diff -r d4879708b899 -r 6c3d5f671d17 linux-2.6-xen-sparse/include/asm-ia64/hypercall.h
--- a/linux-2.6-xen-sparse/include/asm-ia64/hypercall.h	Tue May 16 13:25:43 2006 +0900
+++ b/linux-2.6-xen-sparse/include/asm-ia64/hypercall.h	Tue May 16 13:25:45 2006 +0900
@@ -476,21 +476,21 @@ HYPERVISOR_zap_physmap(unsigned long gpf
 
 static inline unsigned long
 __HYPERVISOR_add_physmap(unsigned long gpfn, unsigned long mfn,
-			 unsigned int flags, domid_t domid)
+			 unsigned int readonly, domid_t domid)
 {
 	return _hypercall_imm4(unsigned long, ia64_dom0vp_op,
-			       IA64_DOM0VP_add_physmap, gpfn, mfn, flags,
+			       IA64_DOM0VP_add_physmap, gpfn, mfn, readonly,
 			       domid);
 }
 
 static inline unsigned long
 HYPERVISOR_add_physmap(unsigned long gpfn, unsigned long mfn,
-		       unsigned int flags, domid_t domid)
+		       unsigned int readonly, domid_t domid)
 {
 	unsigned long ret = 0;
 	BUG_ON(!running_on_xen);//XXX
 	if (running_on_xen) {
-		ret = __HYPERVISOR_add_physmap(gpfn, mfn, flags, domid);
+		ret = __HYPERVISOR_add_physmap(gpfn, mfn, readonly, domid);
 	}
 	return ret;
 }
@@ -503,6 +503,6 @@ HYPERVISOR_add_physmap(unsigned long gpf
 #define HYPERVISOR_phystomach(gpfn)			(gpfn)
 #define HYPERVISOR_machtophys(mfn)			(mfn)
 #define HYPERVISOR_zap_physmap(gpfn, extent_order)	(0)
-#define HYPERVISOR_add_physmap(gpfn, mfn, flags)	(0)
+#define HYPERVISOR_add_physmap(gpfn, mfn, readonly)	(0)
 #endif
 #endif /* __HYPERCALL_H__ */