diff mbox series

[05/16] x86/mm: move guest_physmap_{add,remove}_page()

Message ID 3636b781-d84e-6e95-6bb8-bc6a7c596912@suse.com (mailing list archive)
State New
Headers show
Series x86/mm: large parts of P2M code and struct p2m_domain are HVM-only | expand

Commit Message

Jan Beulich July 5, 2021, 4:07 p.m. UTC
... to a new file, separating the functions from their HVM-specific
backing ones, themselves only dealing with the non-translated case.

To avoid having a new CONFIG_HVM conditional in there, do away with
the inline placeholder.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
diff mbox series

Patch

--- a/xen/arch/x86/mm/Makefile
+++ b/xen/arch/x86/mm/Makefile
@@ -10,6 +10,7 @@  obj-$(CONFIG_MEM_SHARING) += mem_sharing
 obj-y += p2m.o
 obj-$(CONFIG_HVM) += p2m-ept.o p2m-pod.o p2m-pt.o
 obj-y += paging.o
+obj-y += physmap.o
 
 guest_walk_%.o: guest_walk.c Makefile
 	$(CC) $(c_flags) -DGUEST_PAGING_LEVELS=$* -c $< -o $@
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -849,60 +849,6 @@  p2m_remove_page(struct domain *d, gfn_t
 }
 
 int
-guest_physmap_remove_page(struct domain *d, gfn_t gfn,
-                          mfn_t mfn, unsigned int page_order)
-{
-    /* IOMMU for PV guests is handled in get_page_type() and put_page(). */
-    if ( !paging_mode_translate(d) )
-        return 0;
-
-    return p2m_remove_page(d, gfn, mfn, page_order);
-}
-
-#endif /* CONFIG_HVM */
-
-int
-guest_physmap_add_page(struct domain *d, gfn_t gfn, mfn_t mfn,
-                       unsigned int page_order)
-{
-    /* IOMMU for PV guests is handled in get_page_type() and put_page(). */
-    if ( !paging_mode_translate(d) )
-    {
-        struct page_info *page = mfn_to_page(mfn);
-        unsigned long i;
-
-        /*
-         * Our interface for PV guests wrt IOMMU entries hasn't been very
-         * clear; but historically, pages have started out with IOMMU mappings,
-         * and only lose them when changed to a different page type.
-         *
-         * Retain this property by grabbing a writable type ref and then
-         * dropping it immediately.  The result will be pages that have a
-         * writable type (and an IOMMU entry), but a count of 0 (such that
-         * any guest-requested type changes succeed and remove the IOMMU
-         * entry).
-         */
-        for ( i = 0; i < (1UL << page_order); ++i, ++page )
-        {
-            if ( !need_iommu_pt_sync(d) )
-                /* nothing */;
-            else if ( get_page_and_type(page, d, PGT_writable_page) )
-                put_page_and_type(page);
-            else
-                return -EINVAL;
-
-            set_gpfn_from_mfn(mfn_x(mfn) + i, gfn_x(gfn) + i);
-        }
-
-        return 0;
-    }
-
-    return p2m_add_page(d, gfn, mfn, page_order, p2m_ram_rw);
-}
-
-#ifdef CONFIG_HVM
-
-int
 p2m_add_page(struct domain *d, gfn_t gfn, mfn_t mfn,
              unsigned int page_order, p2m_type_t t)
 {
--- /dev/null
+++ b/xen/arch/x86/mm/physmap.c
@@ -0,0 +1,85 @@ 
+/******************************************************************************
+ * arch/x86/mm/physmap.c
+ *
+ * Parts of this code are Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
+ * Parts of this code are Copyright (c) 2007 by Advanced Micro Devices.
+ * Parts of this code are Copyright (c) 2006-2007 by XenSource Inc.
+ * Parts of this code are Copyright (c) 2006 by Michael A Fetterman
+ * Parts based on earlier work by Michael A Fetterman, Ian Pratt et al.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <asm/p2m.h>
+
+#include "mm-locks.h"
+
+int
+guest_physmap_add_page(struct domain *d, gfn_t gfn, mfn_t mfn,
+                       unsigned int page_order)
+{
+    /* IOMMU for PV guests is handled in get_page_type() and put_page(). */
+    if ( !paging_mode_translate(d) )
+    {
+        struct page_info *page = mfn_to_page(mfn);
+        unsigned long i;
+
+        /*
+         * Our interface for PV guests wrt IOMMU entries hasn't been very
+         * clear; but historically, pages have started out with IOMMU mappings,
+         * and only lose them when changed to a different page type.
+         *
+         * Retain this property by grabbing a writable type ref and then
+         * dropping it immediately.  The result will be pages that have a
+         * writable type (and an IOMMU entry), but a count of 0 (such that
+         * any guest-requested type changes succeed and remove the IOMMU
+         * entry).
+         */
+        for ( i = 0; i < (1UL << page_order); ++i, ++page )
+        {
+            if ( !need_iommu_pt_sync(d) )
+                /* nothing */;
+            else if ( get_page_and_type(page, d, PGT_writable_page) )
+                put_page_and_type(page);
+            else
+                return -EINVAL;
+
+            set_gpfn_from_mfn(mfn_x(mfn) + i, gfn_x(gfn) + i);
+        }
+
+        return 0;
+    }
+
+    return p2m_add_page(d, gfn, mfn, page_order, p2m_ram_rw);
+}
+
+int
+guest_physmap_remove_page(struct domain *d, gfn_t gfn,
+                          mfn_t mfn, unsigned int page_order)
+{
+    /* IOMMU for PV guests is handled in get_page_type() and put_page(). */
+    if ( !paging_mode_translate(d) )
+        return 0;
+
+    return p2m_remove_page(d, gfn, mfn, page_order);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--- a/xen/include/xen/p2m-common.h
+++ b/xen/include/xen/p2m-common.h
@@ -8,18 +8,9 @@  int set_foreign_p2m_entry(struct domain
                           unsigned long gfn, mfn_t mfn);
 
 /* Remove a page from a domain's p2m table */
-#ifdef CONFIG_HVM
 int __must_check
 guest_physmap_remove_page(struct domain *d, gfn_t gfn, mfn_t mfn,
                           unsigned int page_order);
-#else
-static inline int
-guest_physmap_remove_page(struct domain *d, gfn_t gfn, mfn_t mfn,
-                          unsigned int page_order)
-{
-    return 0;
-}
-#endif
 
 /* Map MMIO regions in the p2m: start_gfn and nr describe the range in
  *  * the guest physical address space to map, starting from the machine