[Xen-devel] [Patch] allocate_empty_lowmem_region in non-privileged domains

[Ross McIlroy <ross.mcilroy@xxxxxxxxx>]

Below is a patch to the enable allocate_empty_lowmem_region in
on-privileged domains, so that backend drivers can map granted foreign
pages even if they are running in an unprivileged domain. (as per the
"allocate_empty_lowmem_region hypervisor function" thread discussion)

Thanks

Ross


# HG changeset patch
# User rcmcilro@xxxxxxxxxxxxxxxxxxxxx
# Node ID b235cde45efbb903d3e0e9626df6a90adde20577
# Parent  2f743309f21afdc6adaef01421da40f7ff1e8b0d
Add allocate_empty_lowmem_region() for unprivileged domains

diff -r 2f743309f21a -r b235cde45efb
linux-2.6-xen-sparse/arch/xen/i386/mm/hypervisor.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/mm/hypervisor.c        Tue Aug  2
12:37:37 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/mm/hypervisor.c        Tue Aug  2
13:58:30 2005
@@ -35,6 +35,7 @@
 #include <asm/pgtable.h>
 #include <asm-xen/hypervisor.h>
 #include <asm-xen/balloon.h>
+#include <linux/module.h>
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
 #include <linux/percpu.h>
 #include <asm/tlbflush.h>
@@ -312,7 +313,6 @@
     balloon_unlock(flags);
 }
 
-#ifdef CONFIG_XEN_PHYSDEV_ACCESS
 
 unsigned long allocate_empty_lowmem_region(unsigned long pages)
 {
@@ -360,4 +360,4 @@
     return vstart;
 }
 
-#endif /* CONFIG_XEN_PHYSDEV_ACCESS */
+EXPORT_SYMBOL(allocate_empty_lowmem_region);
diff -r 2f743309f21a -r b235cde45efb
linux-2.6-xen-sparse/include/asm-xen/hypervisor.h
--- a/linux-2.6-xen-sparse/include/asm-xen/hypervisor.h Tue Aug  2 12:37:37 2005
+++ b/linux-2.6-xen-sparse/include/asm-xen/hypervisor.h Tue Aug  2 13:58:30 2005
@@ -136,10 +136,8 @@
 
 void xen_contig_memory(unsigned long vstart, unsigned int order);
 
-#ifdef CONFIG_XEN_PHYSDEV_ACCESS
 /* Allocate a contiguous empty region of low memory. Return virtual start. */
 unsigned long allocate_empty_lowmem_region(unsigned long pages);
-#endif
 
 #include <asm/hypercall.h>

allocate_empty_lowmem_region.patch
Description: Text Data

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