xen: add pages parameter to xen_remap_domain_mfn_range

Also introduce xen_unmap_domain_mfn_range. These are the parts of
Mukesh's "xen/pvh: Implement MMU changes for PVH" which are also
needed as a baseline for ARM privcmd support.

The original patch was:

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

This derivative is also:

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

3 files changed, 21 insertions, 4 deletions

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 6226c99729b..0f6386a5b43 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2479,7 +2479,9 @@ static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,
 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
                                unsigned long addr,
                                unsigned long mfn, int nr,
-                               pgprot_t prot, unsigned domid)
+                               pgprot_t prot, unsigned domid,
+                               struct page **pages)
+
 {
         struct remap_data rmd;
         struct mmu_update mmu_update[REMAP_BATCH_SIZE];
@@ -2523,3 +2525,14 @@ out:
         return err;
 }
 EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
+
+/* Returns: 0 success */
+int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
+                               int numpgs, struct page **pages)
+{
+        if (!pages || !xen_feature(XENFEAT_auto_translated_physmap))
+                return 0;
+
+        return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 8adb9cc267f..b612267a8cb 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -178,7 +178,7 @@ static int mmap_mfn_range(void *data, void *state)
                                         msg->va & PAGE_MASK,
                                         msg->mfn, msg->npages,
                                         vma->vm_page_prot,
-                                        st->domain);
+                                        st->domain, NULL);
         if (rc < 0)
                 return rc;
 
@@ -267,7 +267,8 @@ static int mmap_batch_fn(void *data, void *state)
         int ret;
 
         ret = xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
-                                         st->vma->vm_page_prot, st->domain);
+                                         st->vma->vm_page_prot, st->domain,
+                                         NULL);
 
         /* Store error code for second pass. */
         *(st->err++) = ret;
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 6a198e46ab6..990b43e441e 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -27,6 +27,9 @@ struct vm_area_struct;
 int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
                                unsigned long addr,
                                unsigned long mfn, int nr,
-                               pgprot_t prot, unsigned domid);
+                               pgprot_t prot, unsigned domid,
+                               struct page **pages);
+int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
+                               int numpgs, struct page **pages);
 
 #endif /* INCLUDE_XEN_OPS_H */