x86: fix EFI mapping

The patch updates EFI runtime memory mapping code, by making EFI
areas explicitly executable.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 41 insertions, 38 deletions

diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index 1411324a625c..32dd62b36ff7 100644
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -379,11 +379,9 @@ void __init efi_init(void)
 #endif
 }
 
-#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 static void __init runtime_code_page_mkexec(void)
 {
         efi_memory_desc_t *md;
-        unsigned long end;
         void *p;
 
         if (!(__supported_pte_mask & _PAGE_NX))
@@ -392,18 +390,13 @@ static void __init runtime_code_page_mkexec(void)
         /* Make EFI runtime service code area executable */
         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
                 md = p;
-                end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
-                if (md->type == EFI_RUNTIME_SERVICES_CODE &&
-                    (end >> PAGE_SHIFT) <= max_pfn_mapped) {
-                        set_memory_x(md->virt_addr, md->num_pages);
-                        set_memory_uc(md->virt_addr, md->num_pages);
-                }
+
+                if (md->type != EFI_RUNTIME_SERVICES_CODE)
+                        continue;
+
+                set_memory_x(md->virt_addr, md->num_pages << EFI_PAGE_SHIFT);
         }
-        __flush_tlb_all();
 }
-#else
-static inline void __init runtime_code_page_mkexec(void) { }
-#endif
 
 /*
  * This function will switch the EFI runtime services to virtual mode.
@@ -417,30 +410,40 @@ void __init efi_enter_virtual_mode(void)
 {
         efi_memory_desc_t *md;
         efi_status_t status;
-        unsigned long end;
-        void *p;
+        unsigned long size;
+        u64 end, systab;
+        void *p, *va;
 
         efi.systab = NULL;
         for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
                 md = p;
                 if (!(md->attribute & EFI_MEMORY_RUNTIME))
                         continue;
-                end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
-                if ((md->attribute & EFI_MEMORY_WB) &&
-                    ((end >> PAGE_SHIFT) <= max_pfn_mapped))
-                        md->virt_addr = (unsigned long)__va(md->phys_addr);
+
+                size = md->num_pages << EFI_PAGE_SHIFT;
+                end = md->phys_addr + size;
+
+                if ((end >> PAGE_SHIFT) <= max_pfn_mapped)
+                        va = __va(md->phys_addr);
                 else
-                        md->virt_addr = (unsigned long)
-                                efi_ioremap(md->phys_addr,
-                                            md->num_pages << EFI_PAGE_SHIFT);
-                if (!md->virt_addr)
+                        va = efi_ioremap(md->phys_addr, size);
+
+                if (md->attribute & EFI_MEMORY_WB)
+                        set_memory_uc(md->virt_addr, size);
+
+                md->virt_addr = (u64) (unsigned long) va;
+
+                if (!va) {
                         printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
                                (unsigned long long)md->phys_addr);
-                if ((md->phys_addr <= (unsigned long)efi_phys.systab) &&
-                    ((unsigned long)efi_phys.systab < end))
-                        efi.systab = (efi_system_table_t *)(unsigned long)
-                                (md->virt_addr - md->phys_addr +
-                                 (unsigned long)efi_phys.systab);
+                        continue;
+                }
+
+                systab = (u64) (unsigned long) efi_phys.systab;
+                if (md->phys_addr <= systab && systab < end) {
+                        systab += md->virt_addr - md->phys_addr;
+                        efi.systab = (efi_system_table_t *) (unsigned long) systab;
+                }
         }
 
         BUG_ON(!efi.systab);
diff --git a/arch/x86/kernel/efi_64.c b/arch/x86/kernel/efi_64.c
index 674f2379480f..09d5c2330934 100644
--- a/arch/x86/kernel/efi_64.c
+++ b/arch/x86/kernel/efi_64.c
@@ -54,10 +54,10 @@ static void __init early_mapping_set_exec(unsigned long start,
                 else
                         set_pte(kpte, __pte((pte_val(*kpte) | _PAGE_NX) & \
                                             __supported_pte_mask));
-                if (level == 4)
-                        start = (start + PMD_SIZE) & PMD_MASK;
-                else
+                if (level == PG_LEVEL_4K)
                         start = (start + PAGE_SIZE) & PAGE_MASK;
+                else
+                        start = (start + PMD_SIZE) & PMD_MASK;
         }
 }
 
@@ -109,23 +109,23 @@ void __init efi_reserve_bootmem(void)
                                 memmap.nr_map * memmap.desc_size);
 }
 
-void __iomem * __init efi_ioremap(unsigned long offset,
-                                  unsigned long size)
+void __iomem * __init efi_ioremap(unsigned long phys_addr, unsigned long size)
 {
         static unsigned pages_mapped;
-        unsigned long last_addr;
         unsigned i, pages;
 
-        last_addr = offset + size - 1;
-        offset &= PAGE_MASK;
-        pages = (PAGE_ALIGN(last_addr) - offset) >> PAGE_SHIFT;
+        /* phys_addr and size must be page aligned */
+        if ((phys_addr & ~PAGE_MASK) || (size & ~PAGE_MASK))
+                return NULL;
+
+        pages = size >> PAGE_SHIFT;
         if (pages_mapped + pages > MAX_EFI_IO_PAGES)
                 return NULL;
 
         for (i = 0; i < pages; i++) {
                 __set_fixmap(FIX_EFI_IO_MAP_FIRST_PAGE - pages_mapped,
-                             offset, PAGE_KERNEL_EXEC_NOCACHE);
-                offset += PAGE_SIZE;
+                             phys_addr, PAGE_KERNEL);
+                phys_addr += PAGE_SIZE;
                 pages_mapped++;
         }