# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID 5b3ec078993b11433ba6345e0651143d350b488d
# Parent d2e6a7be622d306528074b62ea21d0b672ebd0ea
[IA64] Add support for enforcing singleshot mmap() semantics at the
privcmd interface.
From: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c | 14 ++++++++++++++
linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c | 14 +++++++-------
linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h | 1 +
3 files changed, 22 insertions(+), 7 deletions(-)
diff -r d2e6a7be622d -r 5b3ec078993b
linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c
--- a/linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c Thu Oct 12 11:44:53
2006 +0100
+++ b/linux-2.6-xen-sparse/arch/ia64/xen/hypervisor.c Thu Oct 12 13:55:03
2006 +0100
@@ -546,6 +546,7 @@ struct xen_ia64_privcmd_range {
};
struct xen_ia64_privcmd_vma {
+ int is_privcmd_mmapped;
struct xen_ia64_privcmd_range* range;
unsigned long num_entries;
@@ -684,12 +685,15 @@ static void
static void
xen_ia64_privcmd_vma_open(struct vm_area_struct* vma)
{
+ struct xen_ia64_privcmd_vma* old_privcmd_vma = (struct
xen_ia64_privcmd_vma*)vma->vm_private_data;
struct xen_ia64_privcmd_vma* privcmd_vma = (struct
xen_ia64_privcmd_vma*)vma->vm_private_data;
struct xen_ia64_privcmd_range* privcmd_range = privcmd_vma->range;
atomic_inc(&privcmd_range->ref_count);
// vm_op->open() can't fail.
privcmd_vma = kmalloc(sizeof(*privcmd_vma), GFP_KERNEL | __GFP_NOFAIL);
+ // copy original value if necessary
+ privcmd_vma->is_privcmd_mmapped = old_privcmd_vma->is_privcmd_mmapped;
__xen_ia64_privcmd_vma_open(vma, privcmd_vma, privcmd_range);
}
@@ -722,6 +726,14 @@ xen_ia64_privcmd_vma_close(struct vm_are
kfree(privcmd_range->res);
vfree(privcmd_range);
}
+}
+
+int
+privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
+{
+ struct xen_ia64_privcmd_vma* privcmd_vma =
+ (struct xen_ia64_privcmd_vma *)vma->vm_private_data;
+ return (xchg(&privcmd_vma->is_privcmd_mmapped, 1) == 0);
}
int
@@ -749,6 +761,8 @@ privcmd_mmap(struct file * file, struct
if (privcmd_vma == NULL) {
goto out_enomem1;
}
+ privcmd_vma->is_privcmd_mmapped = 0;
+
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (res == NULL) {
goto out_enomem1;
diff -r d2e6a7be622d -r 5b3ec078993b
linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c
--- a/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c Thu Oct 12
11:44:53 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/privcmd/privcmd.c Thu Oct 12
13:55:03 2006 +0100
@@ -35,14 +35,9 @@ static struct proc_dir_entry *privcmd_in
static struct proc_dir_entry *privcmd_intf;
static struct proc_dir_entry *capabilities_intf;
-static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
-{
#ifndef HAVE_ARCH_PRIVCMD_MMAP
- if (xchg(&vma->vm_private_data, (void *)1) != NULL)
- return 0;
-#endif
- return 1;
-}
+static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
+#endif
static int privcmd_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long data)
@@ -255,6 +250,11 @@ static int privcmd_mmap(struct file * fi
return 0;
}
+
+static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
+{
+ return (xchg(&vma->vm_private_data, (void *)1) == NULL);
+}
#endif
static struct file_operations privcmd_file_ops = {
diff -r d2e6a7be622d -r 5b3ec078993b
linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h
--- a/linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h Thu Oct 12
11:44:53 2006 +0100
+++ b/linux-2.6-xen-sparse/include/asm-ia64/hypervisor.h Thu Oct 12
13:55:03 2006 +0100
@@ -138,6 +138,7 @@ int direct_remap_pfn_range(struct vm_are
pgprot_t prot,
domid_t domid);
struct file;
+int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
int privcmd_mmap(struct file * file, struct vm_area_struct * vma);
#define HAVE_ARCH_PRIVCMD_MMAP
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