xen/privcmd: move remap_domain_mfn_range() to core xen code and export.

This allows xenfs to be built as a module, previously it required flush_tlb_all
and arbitrary_virt_to_machine to be exported.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 1ceb0f2fa0af..f08ea045620f 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2265,6 +2265,72 @@ void __init xen_hvm_init_mmu_ops(void)
 }
 #endif
 
+#define REMAP_BATCH_SIZE 16
+
+struct remap_data {
+        unsigned long mfn;
+        pgprot_t prot;
+        struct mmu_update *mmu_update;
+};
+
+static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,
+                                 unsigned long addr, void *data)
+{
+        struct remap_data *rmd = data;
+        pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
+
+        rmd->mmu_update->ptr = arbitrary_virt_to_machine(ptep).maddr;
+        rmd->mmu_update->val = pte_val_ma(pte);
+        rmd->mmu_update++;
+
+        return 0;
+}
+
+int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
+                               unsigned long addr,
+                               unsigned long mfn, int nr,
+                               pgprot_t prot, unsigned domid)
+{
+        struct remap_data rmd;
+        struct mmu_update mmu_update[REMAP_BATCH_SIZE];
+        int batch;
+        unsigned long range;
+        int err = 0;
+
+        prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
+
+        vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
+
+        rmd.mfn = mfn;
+        rmd.prot = prot;
+
+        while (nr) {
+                batch = min(REMAP_BATCH_SIZE, nr);
+                range = (unsigned long)batch << PAGE_SHIFT;
+
+                rmd.mmu_update = mmu_update;
+                err = apply_to_page_range(vma->vm_mm, addr, range,
+                                          remap_area_mfn_pte_fn, &rmd);
+                if (err)
+                        goto out;
+
+                err = -EFAULT;
+                if (HYPERVISOR_mmu_update(mmu_update, batch, NULL, domid) < 0)
+                        goto out;
+
+                nr -= batch;
+                addr += range;
+        }
+
+        err = 0;
+out:
+
+        flush_tlb_all();
+
+        return err;
+}
+EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
+
 #ifdef CONFIG_XEN_DEBUG_FS
 
 static struct dentry *d_mmu_debug;