[Xen-devel,05/27] xen/mm: Use typesafe MFN for alloc_boot_pages return

Message ID 20170814142418.13267-6-julien.grall@arm.com
State New
Headers show
Series
  • xen/arm: Memory subsystem clean-up
Related show

Commit Message

Julien Grall Aug. 14, 2017, 2:23 p.m.
At the moment, most of the callers will have to use mfn_x. However
follow-up patches will remove some of them by propagating the typesafe a
bit further.

Signed-off-by: Julien Grall <julien.grall@arm.com>
---

Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
---
 xen/arch/arm/mm.c       | 26 ++++++++++++++------------
 xen/arch/arm/setup.c    |  4 ++--
 xen/arch/x86/mm.c       |  4 ++--
 xen/arch/x86/numa.c     |  2 +-
 xen/arch/x86/srat.c     |  2 +-
 xen/common/page_alloc.c |  7 +++----
 xen/drivers/acpi/osl.c  |  2 +-
 xen/include/xen/mm.h    |  3 +--
 8 files changed, 25 insertions(+), 25 deletions(-)

Comments

Jan Beulich Aug. 22, 2017, 8:28 a.m. | #1
>>> On 14.08.17 at 16:23, <julien.grall@arm.com> wrote:
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -200,7 +200,7 @@ static void __init init_frametable_chunk(void *start, void *end)
>           */
>          while ( step && s + (step << PAGE_SHIFT) > e + (4 << PAGE_SHIFT) )
>              step >>= PAGETABLE_ORDER;
> -        mfn = alloc_boot_pages(step, step);
> +        mfn = mfn_x(alloc_boot_pages(step, step));
>          map_pages_to_xen(s, mfn, step, PAGE_HYPERVISOR);

I think overall it would be better if mfn had its type changed here.

> --- a/xen/arch/x86/srat.c
> +++ b/xen/arch/x86/srat.c
> @@ -193,7 +193,7 @@ void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
>  		       "Not used.\n");
>  		return;
>  	}
> -	mfn = alloc_boot_pages(PFN_UP(slit->header.length), 1);
> +	mfn = mfn_x(alloc_boot_pages(PFN_UP(slit->header.length), 1));
>  	acpi_slit = mfn_to_virt(mfn);

Same here.

Jan

Patch

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index a810a056d7..b3def63ed7 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -864,13 +864,13 @@  void __init setup_xenheap_mappings(unsigned long base_mfn,
         }
         else
         {
-            unsigned long first_mfn = alloc_boot_pages(1, 1);
+            mfn_t first_mfn = alloc_boot_pages(1, 1);
 
-            clear_page(mfn_to_virt(first_mfn));
-            pte = mfn_to_xen_entry(_mfn(first_mfn), WRITEALLOC);
+            clear_page(mfn_to_virt(mfn_x(first_mfn)));
+            pte = mfn_to_xen_entry(first_mfn, WRITEALLOC);
             pte.pt.table = 1;
             write_pte(p, pte);
-            first = mfn_to_virt(first_mfn);
+            first = mfn_to_virt(mfn_x(first_mfn));
         }
 
         pte = mfn_to_xen_entry(_mfn(mfn), WRITEALLOC);
@@ -891,11 +891,12 @@  void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
     unsigned long nr_pages = (pe - ps) >> PAGE_SHIFT;
     unsigned long nr_pdxs = pfn_to_pdx(nr_pages);
     unsigned long frametable_size = nr_pdxs * sizeof(struct page_info);
-    unsigned long base_mfn;
+    mfn_t base_mfn;
     const unsigned long mapping_size = frametable_size < MB(32) ? MB(2) : MB(32);
 #ifdef CONFIG_ARM_64
     lpae_t *second, pte;
-    unsigned long nr_second, second_base;
+    unsigned long nr_second;
+    mfn_t second_base;
     int i;
 #endif
 
@@ -908,18 +909,19 @@  void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
     /* Compute the number of second level pages. */
     nr_second = ROUNDUP(frametable_size, FIRST_SIZE) >> FIRST_SHIFT;
     second_base = alloc_boot_pages(nr_second, 1);
-    second = mfn_to_virt(second_base);
+    second = mfn_to_virt(mfn_x(second_base));
     for ( i = 0; i < nr_second; i++ )
     {
-        clear_page(mfn_to_virt(second_base + i));
-        pte = mfn_to_xen_entry(_mfn(second_base + i), WRITEALLOC);
+        clear_page(mfn_to_virt(mfn_x(mfn_add(second_base, i))));
+        pte = mfn_to_xen_entry(mfn_add(second_base, i), WRITEALLOC);
         pte.pt.table = 1;
         write_pte(&xen_first[first_table_offset(FRAMETABLE_VIRT_START)+i], pte);
     }
-    create_mappings(second, 0, base_mfn, frametable_size >> PAGE_SHIFT, mapping_size);
+    create_mappings(second, 0, mfn_x(base_mfn), frametable_size >> PAGE_SHIFT,
+                    mapping_size);
 #else
-    create_mappings(xen_second, FRAMETABLE_VIRT_START,
-                    base_mfn, frametable_size >> PAGE_SHIFT, mapping_size);
+    create_mappings(xen_second, FRAMETABLE_VIRT_START, mfn_x(base_mfn),
+                    frametable_size >> PAGE_SHIFT, mapping_size);
 #endif
 
     memset(&frame_table[0], 0, nr_pdxs * sizeof(struct page_info));
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 3b34855668..277b566b88 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -561,7 +561,7 @@  static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
     init_boot_pages(pfn_to_paddr(boot_mfn_start), pfn_to_paddr(boot_mfn_end));
 
     /* Copy the DTB. */
-    fdt = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
+    fdt = mfn_to_virt(mfn_x(alloc_boot_pages(dtb_pages, 1)));
     copy_from_paddr(fdt, dtb_paddr, dtb_size);
     device_tree_flattened = fdt;
 
@@ -671,7 +671,7 @@  static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
     dtb_pages = (dtb_size + PAGE_SIZE-1) >> PAGE_SHIFT;
 
     /* Copy the DTB. */
-    fdt = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
+    fdt = mfn_to_virt(mfn_x(alloc_boot_pages(dtb_pages, 1)));
     copy_from_paddr(fdt, dtb_paddr, dtb_size);
     device_tree_flattened = fdt;
 
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 66e337109d..dc54ebf2e6 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -200,7 +200,7 @@  static void __init init_frametable_chunk(void *start, void *end)
          */
         while ( step && s + (step << PAGE_SHIFT) > e + (4 << PAGE_SHIFT) )
             step >>= PAGETABLE_ORDER;
-        mfn = alloc_boot_pages(step, step);
+        mfn = mfn_x(alloc_boot_pages(step, step));
         map_pages_to_xen(s, mfn, step, PAGE_HYPERVISOR);
     }
 
@@ -5417,7 +5417,7 @@  void *alloc_xen_pagetable(void)
         return ptr;
     }
 
-    return mfn_to_virt(alloc_boot_pages(1, 1));
+    return mfn_to_virt(mfn_x(alloc_boot_pages(1, 1)));
 }
 
 void free_xen_pagetable(void *v)
diff --git a/xen/arch/x86/numa.c b/xen/arch/x86/numa.c
index ffeba6e180..90422517b0 100644
--- a/xen/arch/x86/numa.c
+++ b/xen/arch/x86/numa.c
@@ -99,7 +99,7 @@  static int __init populate_memnodemap(const struct node *nodes,
 static int __init allocate_cachealigned_memnodemap(void)
 {
     unsigned long size = PFN_UP(memnodemapsize * sizeof(*memnodemap));
-    unsigned long mfn = alloc_boot_pages(size, 1);
+    unsigned long mfn = mfn_x(alloc_boot_pages(size, 1));
 
     memnodemap = mfn_to_virt(mfn);
     mfn <<= PAGE_SHIFT;
diff --git a/xen/arch/x86/srat.c b/xen/arch/x86/srat.c
index 95660a9bbc..5d38a9ac62 100644
--- a/xen/arch/x86/srat.c
+++ b/xen/arch/x86/srat.c
@@ -193,7 +193,7 @@  void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 		       "Not used.\n");
 		return;
 	}
-	mfn = alloc_boot_pages(PFN_UP(slit->header.length), 1);
+	mfn = mfn_x(alloc_boot_pages(PFN_UP(slit->header.length), 1));
 	acpi_slit = mfn_to_virt(mfn);
 	memcpy(acpi_slit, slit, slit->header.length);
 }
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 64fe951e8d..ecffac6a28 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -315,8 +315,7 @@  void __init init_boot_pages(paddr_t ps, paddr_t pe)
     }
 }
 
-unsigned long __init alloc_boot_pages(
-    unsigned long nr_pfns, unsigned long pfn_align)
+mfn_t __init alloc_boot_pages(unsigned long nr_pfns, unsigned long pfn_align)
 {
     unsigned long pg, _e;
     unsigned int i = nr_bootmem_regions;
@@ -345,14 +344,14 @@  unsigned long __init alloc_boot_pages(
             if ( pg + nr_pfns > PFN_DOWN(highmem_start) )
                 continue;
             r->s = pg + nr_pfns;
-            return pg;
+            return _mfn(pg);
         }
 #endif
 
         _e = r->e;
         r->e = pg;
         bootmem_region_add(pg + nr_pfns, _e);
-        return pg;
+        return _mfn(pg);
     }
 
     BUG();
diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
index 9881db19da..52c9b4ba9a 100644
--- a/xen/drivers/acpi/osl.c
+++ b/xen/drivers/acpi/osl.c
@@ -214,7 +214,7 @@  void *__init acpi_os_alloc_memory(size_t sz)
 	void *ptr;
 
 	if (system_state == SYS_STATE_early_boot)
-		return mfn_to_virt(alloc_boot_pages(PFN_UP(sz), 1));
+		return mfn_to_virt(mfn_x(alloc_boot_pages(PFN_UP(sz), 1)));
 
 	ptr = xmalloc_bytes(sz);
 	ASSERT(!ptr || is_xmalloc_memory(ptr));
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index eb0409d832..cf3f0fc396 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -157,8 +157,7 @@  struct domain *__must_check page_get_owner_and_reference(struct page_info *);
 
 /* Boot-time allocator. Turns into generic allocator after bootstrap. */
 void init_boot_pages(paddr_t ps, paddr_t pe);
-unsigned long alloc_boot_pages(
-    unsigned long nr_pfns, unsigned long pfn_align);
+mfn_t alloc_boot_pages(unsigned long nr_pfns, unsigned long pfn_align);
 void end_boot_allocator(void);
 
 /* Xen suballocator. These functions are interrupt-safe. */