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-rw-r--r--drivers/xen/xlate_mmu.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
new file mode 100644
index 000000000000..7724d90fc697
--- /dev/null
+++ b/drivers/xen/xlate_mmu.c
@@ -0,0 +1,133 @@
+/*
+ * MMU operations common to all auto-translated physmap guests.
+ *
+ * Copyright (C) 2015 Citrix Systems R&D Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/memory.h>
+
+/* map fgmfn of domid to lpfn in the current domain */
+static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
+ unsigned int domid)
+{
+ int rc;
+ struct xen_add_to_physmap_range xatp = {
+ .domid = DOMID_SELF,
+ .foreign_domid = domid,
+ .size = 1,
+ .space = XENMAPSPACE_gmfn_foreign,
+ };
+ xen_ulong_t idx = fgmfn;
+ xen_pfn_t gpfn = lpfn;
+ int err = 0;
+
+ set_xen_guest_handle(xatp.idxs, &idx);
+ set_xen_guest_handle(xatp.gpfns, &gpfn);
+ set_xen_guest_handle(xatp.errs, &err);
+
+ rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
+ return rc < 0 ? rc : err;
+}
+
+struct remap_data {
+ xen_pfn_t fgmfn; /* foreign domain's gmfn */
+ pgprot_t prot;
+ domid_t domid;
+ struct vm_area_struct *vma;
+ int index;
+ struct page **pages;
+ struct xen_remap_mfn_info *info;
+};
+
+static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
+ void *data)
+{
+ struct remap_data *info = data;
+ struct page *page = info->pages[info->index++];
+ unsigned long pfn = page_to_pfn(page);
+ pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
+ int rc;
+
+ rc = map_foreign_page(pfn, info->fgmfn, info->domid);
+ if (rc < 0)
+ return rc;
+ set_pte_at(info->vma->vm_mm, addr, ptep, pte);
+
+ return 0;
+}
+
+int xen_xlate_remap_gfn_range(struct vm_area_struct *vma,
+ unsigned long addr,
+ xen_pfn_t gfn, int nr,
+ pgprot_t prot, unsigned domid,
+ struct page **pages)
+{
+ int err;
+ struct remap_data data;
+
+ /* TBD: Batching, current sole caller only does page at a time */
+ if (nr > 1)
+ return -EINVAL;
+
+ data.fgmfn = gfn;
+ data.prot = prot;
+ data.domid = domid;
+ data.vma = vma;
+ data.index = 0;
+ data.pages = pages;
+ err = apply_to_page_range(vma->vm_mm, addr, nr << PAGE_SHIFT,
+ remap_pte_fn, &data);
+ return err;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_range);
+
+int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
+ int nr, struct page **pages)
+{
+ int i;
+
+ for (i = 0; i < nr; i++) {
+ struct xen_remove_from_physmap xrp;
+ unsigned long pfn;
+
+ pfn = page_to_pfn(pages[i]);
+
+ xrp.domid = DOMID_SELF;
+ xrp.gpfn = pfn;
+ (void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);