[Xen-devel] [PATCH v3 1/5] xen: add a p2mt parameter to map_mmio_regions

[Stefano Stabellini <sstabellini@kernel.org>]

Add a p2mt parameter to map_mmio_regions, pass p2m_mmio_direct_dev on
ARM and p2m_mmio_direct on x86 -- no changes in behavior. On x86,
introduce a macro to strip away the last parameter and rename the
existing implementation of map_mmio_regions to __map_mmio_regions.
Use __map_mmio_regions in vpci as it is x86-only today.

On ARM, given the similarity between map_mmio_regions after the change
and map_regions_p2mt, remove un/map_regions_p2mt. Also add an ASSERT to
check that only p2m_mmio_* types are passed to it.

Also fix the style of the comment on top of map_mmio_regions since we
are at it.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
CC: JBeulich@suse.com
CC: andrew.cooper3@citrix.com
---
Changes in v3:
- code style
- introduce __map_mmio_regions on x86
- fix comment style on top of map_mmio_regions
- add an assert on allowed p2mt types in map_mmio_regions

Changes in v2:
- new patch
---
 xen/arch/arm/acpi/domain_build.c |  4 ++--
 xen/arch/arm/domain_build.c      |  2 +-
 xen/arch/arm/gic-v2.c            |  3 ++-
 xen/arch/arm/p2m.c               | 21 ++++-----------------
 xen/arch/arm/platforms/exynos5.c |  6 ++++--
 xen/arch/arm/platforms/omap5.c   | 12 ++++++++----
 xen/arch/arm/traps.c             |  2 +-
 xen/arch/arm/vgic-v2.c           |  2 +-
 xen/arch/arm/vgic/vgic-v2.c      |  2 +-
 xen/arch/x86/hvm/dom0_build.c    |  2 +-
 xen/arch/x86/mm/p2m.c            |  8 ++++----
 xen/common/domctl.c              |  7 ++++++-
 xen/drivers/vpci/header.c        |  2 +-
 xen/include/asm-arm/p2m.h        | 15 ---------------
 xen/include/asm-x86/p2m.h        |  8 ++++++++
 xen/include/xen/p2m-common.h     | 11 +++++++----
 16 files changed, 51 insertions(+), 56 deletions(-)

diff --git a/xen/arch/arm/acpi/domain_build.c b/xen/arch/arm/acpi/domain_build.c
index 5aae32ac20..f4ac91cdac 100644
--- a/xen/arch/arm/acpi/domain_build.c
+++ b/xen/arch/arm/acpi/domain_build.c
@@ -193,7 +193,7 @@ static void __init acpi_map_other_tables(struct domain *d)
     {
         addr = acpi_gbl_root_table_list.tables[i].address;
         size = acpi_gbl_root_table_list.tables[i].length;
-        res = map_regions_p2mt(d,
+        res = map_mmio_regions(d,
                                gaddr_to_gfn(addr),
                                PFN_UP(size),
                                maddr_to_mfn(addr),
@@ -547,7 +547,7 @@ int __init prepare_acpi(struct domain *d, struct kernel_info *kinfo)
     acpi_create_efi_mmap_table(d, &kinfo->mem, tbl_add);
 
     /* Map the EFI and ACPI tables to Dom0 */
-    rc = map_regions_p2mt(d,
+    rc = map_mmio_regions(d,
                           gaddr_to_gfn(d->arch.efi_acpi_gpa),
                           PFN_UP(d->arch.efi_acpi_len),
                           virt_to_mfn(d->arch.efi_acpi_table),
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index d9836779d1..1f808b2ff1 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1171,7 +1171,7 @@ static int __init map_range_to_domain(const struct dt_device_node *dev,
 
     if ( need_mapping )
     {
-        res = map_regions_p2mt(d,
+        res = map_mmio_regions(d,
                                gaddr_to_gfn(addr),
                                PFN_UP(len),
                                maddr_to_mfn(addr),
diff --git a/xen/arch/arm/gic-v2.c b/xen/arch/arm/gic-v2.c
index 256988c665..d2ef361fc7 100644
--- a/xen/arch/arm/gic-v2.c
+++ b/xen/arch/arm/gic-v2.c
@@ -701,7 +701,8 @@ static int gicv2_map_hwdown_extra_mappings(struct domain *d)
 
         ret = map_mmio_regions(d, gaddr_to_gfn(v2m_data->addr),
                                PFN_UP(v2m_data->size),
-                               maddr_to_mfn(v2m_data->addr));
+                               maddr_to_mfn(v2m_data->addr),
+                               p2m_mmio_direct_dev);
         if ( ret )
         {
             printk(XENLOG_ERR "GICv2: Map v2m frame to d%d failed.\n",
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index e28ea1c85a..d88df11e09 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1310,31 +1310,18 @@ static inline int p2m_remove_mapping(struct domain *d,
     return rc;
 }
 
-int map_regions_p2mt(struct domain *d,
+int map_mmio_regions(struct domain *d,
                      gfn_t gfn,
                      unsigned long nr,
                      mfn_t mfn,
                      p2m_type_t p2mt)
 {
+    ASSERT( p2mt == p2m_mmio_direct_dev ||
+            p2mt == p2m_mmio_direct_nc ||
+            p2mt == p2m_mmio_direct_c );
     return p2m_insert_mapping(d, gfn, nr, mfn, p2mt);
 }
 
-int unmap_regions_p2mt(struct domain *d,
-                       gfn_t gfn,
-                       unsigned long nr,
-                       mfn_t mfn)
-{
-    return p2m_remove_mapping(d, gfn, nr, mfn);
-}
-
-int map_mmio_regions(struct domain *d,
-                     gfn_t start_gfn,
-                     unsigned long nr,
-                     mfn_t mfn)
-{
-    return p2m_insert_mapping(d, start_gfn, nr, mfn, p2m_mmio_direct_dev);
-}
-
 int unmap_mmio_regions(struct domain *d,
                        gfn_t start_gfn,
                        unsigned long nr,
diff --git a/xen/arch/arm/platforms/exynos5.c b/xen/arch/arm/platforms/exynos5.c
index 6560507092..97cd080759 100644
--- a/xen/arch/arm/platforms/exynos5.c
+++ b/xen/arch/arm/platforms/exynos5.c
@@ -83,11 +83,13 @@ static int exynos5250_specific_mapping(struct domain *d)
 {
     /* Map the chip ID */
     map_mmio_regions(d, gaddr_to_gfn(EXYNOS5_PA_CHIPID), 1,
-                     maddr_to_mfn(EXYNOS5_PA_CHIPID));
+                     maddr_to_mfn(EXYNOS5_PA_CHIPID),
+                     p2m_mmio_direct_dev);
 
     /* Map the PWM region */
     map_mmio_regions(d, gaddr_to_gfn(EXYNOS5_PA_TIMER), 2,
-                     maddr_to_mfn(EXYNOS5_PA_TIMER));
+                     maddr_to_mfn(EXYNOS5_PA_TIMER),
+                     p2m_mmio_direct_dev);
 
     return 0;
 }
diff --git a/xen/arch/arm/platforms/omap5.c b/xen/arch/arm/platforms/omap5.c
index aee24e4d28..c5701dfd6c 100644
--- a/xen/arch/arm/platforms/omap5.c
+++ b/xen/arch/arm/platforms/omap5.c
@@ -99,19 +99,23 @@ static int omap5_specific_mapping(struct domain *d)
 {
     /* Map the PRM module */
     map_mmio_regions(d, gaddr_to_gfn(OMAP5_PRM_BASE), 2,
-                     maddr_to_mfn(OMAP5_PRM_BASE));
+                     maddr_to_mfn(OMAP5_PRM_BASE),
+                     p2m_mmio_direct_dev);
 
     /* Map the PRM_MPU */
     map_mmio_regions(d, gaddr_to_gfn(OMAP5_PRCM_MPU_BASE), 1,
-                     maddr_to_mfn(OMAP5_PRCM_MPU_BASE));
+                     maddr_to_mfn(OMAP5_PRCM_MPU_BASE),
+                     p2m_mmio_direct_dev);
 
     /* Map the Wakeup Gen */
     map_mmio_regions(d, gaddr_to_gfn(OMAP5_WKUPGEN_BASE), 1,
-                     maddr_to_mfn(OMAP5_WKUPGEN_BASE));
+                     maddr_to_mfn(OMAP5_WKUPGEN_BASE),
+                     p2m_mmio_direct_dev);
 
     /* Map the on-chip SRAM */
     map_mmio_regions(d, gaddr_to_gfn(OMAP5_SRAM_PA), 32,
-                     maddr_to_mfn(OMAP5_SRAM_PA));
+                     maddr_to_mfn(OMAP5_SRAM_PA),
+                     p2m_mmio_direct_dev);
 
     return 0;
 }
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 3103620323..ec125cfd4f 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1884,7 +1884,7 @@ static bool try_map_mmio(gfn_t gfn)
     if ( !iomem_access_permitted(d, mfn_x(mfn), mfn_x(mfn) + 1) )
         return false;
 
-    return !map_regions_p2mt(d, gfn, 1, mfn, p2m_mmio_direct_c);
+    return !map_mmio_regions(d, gfn, 1, mfn, p2m_mmio_direct_c);
 }
 
 static void do_trap_stage2_abort_guest(struct cpu_user_regs *regs,
diff --git a/xen/arch/arm/vgic-v2.c b/xen/arch/arm/vgic-v2.c
index 64b141fea5..1543625ea4 100644
--- a/xen/arch/arm/vgic-v2.c
+++ b/xen/arch/arm/vgic-v2.c
@@ -691,7 +691,7 @@ static int vgic_v2_domain_init(struct domain *d)
      * region of the guest.
      */
     ret = map_mmio_regions(d, gaddr_to_gfn(cbase), csize / PAGE_SIZE,
-                           maddr_to_mfn(vbase));
+                           maddr_to_mfn(vbase), p2m_mmio_direct_dev);
     if ( ret )
         return ret;
 
diff --git a/xen/arch/arm/vgic/vgic-v2.c b/xen/arch/arm/vgic/vgic-v2.c
index b5ba4ace87..04f34ddab5 100644
--- a/xen/arch/arm/vgic/vgic-v2.c
+++ b/xen/arch/arm/vgic/vgic-v2.c
@@ -309,7 +309,7 @@ int vgic_v2_map_resources(struct domain *d)
      * region of the guest.
      */
     ret = map_mmio_regions(d, gaddr_to_gfn(cbase), csize / PAGE_SIZE,
-                           maddr_to_mfn(vbase));
+                           maddr_to_mfn(vbase), p2m_mmio_direct_dev);
     if ( ret )
     {
         gdprintk(XENLOG_ERR, "Unable to remap VGIC CPU to VCPU\n");
diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
index 8845399ae9..3a43234f69 100644
--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -79,7 +79,7 @@ static int __init modify_identity_mmio(struct domain *d, unsigned long pfn,
 
     for ( ; ; )
     {
-        rc = map ?   map_mmio_regions(d, _gfn(pfn), nr_pages, _mfn(pfn))
+        rc = map ?   __map_mmio_regions(d, _gfn(pfn), nr_pages, _mfn(pfn))
                  : unmap_mmio_regions(d, _gfn(pfn), nr_pages, _mfn(pfn));
         if ( rc == 0 )
             break;
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 4c9954867c..e007eee42f 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -2276,10 +2276,10 @@ static unsigned int mmio_order(const struct domain *d,
 
 #define MAP_MMIO_MAX_ITER 64 /* pretty arbitrary */
 
-int map_mmio_regions(struct domain *d,
-                     gfn_t start_gfn,
-                     unsigned long nr,
-                     mfn_t mfn)
+int __map_mmio_regions(struct domain *d,
+                       gfn_t start_gfn,
+                       unsigned long nr,
+                       mfn_t mfn)
 {
     int ret = 0;
     unsigned long i;
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 72a44953d0..c6fd88d285 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -927,6 +927,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
         unsigned long nr_mfns = op->u.memory_mapping.nr_mfns;
         unsigned long mfn_end = mfn + nr_mfns - 1;
         int add = op->u.memory_mapping.add_mapping;
+        p2m_type_t p2mt;
 
         ret = -EINVAL;
         if ( mfn_end < mfn || /* wrap? */
@@ -939,6 +940,10 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
         /* Must break hypercall up as this could take a while. */
         if ( nr_mfns > 64 )
             break;
+
+        p2mt = p2m_mmio_direct_dev;
+#else
+        p2mt = p2m_mmio_direct;
 #endif
 
         ret = -EPERM;
@@ -956,7 +961,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
                    "memory_map:add: dom%d gfn=%lx mfn=%lx nr=%lx\n",
                    d->domain_id, gfn, mfn, nr_mfns);
 
-            ret = map_mmio_regions(d, _gfn(gfn), nr_mfns, _mfn(mfn));
+            ret = map_mmio_regions(d, _gfn(gfn), nr_mfns, _mfn(mfn), p2mt);
             if ( ret < 0 )
                 printk(XENLOG_G_WARNING
                        "memory_map:fail: dom%d gfn=%lx mfn=%lx nr=%lx ret:%ld\n",
diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c
index 258b91deed..ade6d19b45 100644
--- a/xen/drivers/vpci/header.c
+++ b/xen/drivers/vpci/header.c
@@ -52,7 +52,7 @@ static int map_range(unsigned long s, unsigned long e, void *data,
          * - {un}map_mmio_regions doesn't support preemption.
          */
 
-        rc = map->map ? map_mmio_regions(map->d, _gfn(s), size, _mfn(s))
+        rc = map->map ? __map_mmio_regions(map->d, _gfn(s), size, _mfn(s))
                       : unmap_mmio_regions(map->d, _gfn(s), size, _mfn(s));
         if ( rc == 0 )
         {
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 2f89bb00c3..76aadc215d 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -252,21 +252,6 @@ void p2m_toggle_cache(struct vcpu *v, bool was_enabled);
 
 void p2m_flush_vm(struct vcpu *v);
 
-/*
- * Map a region in the guest p2m with a specific p2m type.
- * The memory attributes will be derived from the p2m type.
- */
-int map_regions_p2mt(struct domain *d,
-                     gfn_t gfn,
-                     unsigned long nr,
-                     mfn_t mfn,
-                     p2m_type_t p2mt);
-
-int unmap_regions_p2mt(struct domain *d,
-                       gfn_t gfn,
-                       unsigned long nr,
-                       mfn_t mfn);
-
 int map_dev_mmio_region(struct domain *d,
                         gfn_t gfn,
                         unsigned long nr,
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 09ef7e02fd..8321dc1f2a 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -1000,6 +1000,14 @@ static inline int p2m_entry_modify(struct p2m_domain *p2m, p2m_type_t nt,
     return 0;
 }
 
+/* x86 doesn't use the p2mt parameter, just strip it away */
+#define map_mmio_regions(d, start_gfn, nr, mfn, p2mt) \
+            __map_mmio_regions(d, start_gfn, nr, mfn)
+int __map_mmio_regions(struct domain *d,
+                       gfn_t start_gfn,
+                       unsigned long nr,
+                       mfn_t mfn);
+
 #endif /* _XEN_ASM_X86_P2M_H */
 
 /*
diff --git a/xen/include/xen/p2m-common.h b/xen/include/xen/p2m-common.h
index 58031a6ea8..e20b4974b0 100644
--- a/xen/include/xen/p2m-common.h
+++ b/xen/include/xen/p2m-common.h
@@ -8,13 +8,16 @@ int __must_check
 guest_physmap_remove_page(struct domain *d, gfn_t gfn, mfn_t mfn,
                           unsigned int page_order);
 
-/* 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
- *   * frame number mfn. */
+/*
+ * 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
+ * frame number mfn.
+ */
 int map_mmio_regions(struct domain *d,
                      gfn_t start_gfn,
                      unsigned long nr,
-                     mfn_t mfn);
+                     mfn_t mfn,
+                     p2m_type_t p2mt);
 int unmap_mmio_regions(struct domain *d,
                        gfn_t start_gfn,
                        unsigned long nr,
-- 
2.17.1


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