x86: fixes some bugs about EFI memory map handling

This patch fixes some bugs of EFI memory handing code.

- On x86_64, it is possible that EFI memory map can not be mapped via
  identity map, so efi_map_memmap is removed, just use early_ioremap.

- On i386, the EFI memory map mapping take effect cross paging_init,
  so it is not necessary to use efi_map_memmap.

- EFI memory map is unmapped in efi_enter_virtual_mode to avoid
  early_ioremap leak.

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>

5 files changed, 3 insertions, 29 deletions

diff --git a/arch/x86/kernel/efi.c b/arch/x86/kernel/efi.c
index 174b067b9d03..1411324a625c 100644
--- a/arch/x86/kernel/efi.c
+++ b/arch/x86/kernel/efi.c
@@ -474,6 +474,8 @@ void __init efi_enter_virtual_mode(void)
         efi.reset_system = virt_efi_reset_system;
         efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
         runtime_code_page_mkexec();
+        early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
+        memmap.map = NULL;
 }
 
 /*
diff --git a/arch/x86/kernel/efi_32.c b/arch/x86/kernel/efi_32.c
index 114b896d7573..cb91f985b4a1 100644
--- a/arch/x86/kernel/efi_32.c
+++ b/arch/x86/kernel/efi_32.c
@@ -109,18 +109,3 @@ void efi_call_phys_epilog(void)
 
         local_irq_restore(efi_rt_eflags);
 }
-
-/*
- * We need to map the EFI memory map again after paging_init().
- */
-void __init efi_map_memmap(void)
-{
-        memmap.map = NULL;
-
-        memmap.map = early_ioremap((unsigned long) memmap.phys_map,
-                        (memmap.nr_map * memmap.desc_size));
-        if (memmap.map == NULL)
-                printk(KERN_ERR "Could not remap the EFI memmap!\n");
-
-        memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
-}
diff --git a/arch/x86/kernel/efi_64.c b/arch/x86/kernel/efi_64.c
index 9f8a75594398..4b73992c1e11 100644
--- a/arch/x86/kernel/efi_64.c
+++ b/arch/x86/kernel/efi_64.c
@@ -103,15 +103,6 @@ void __init efi_call_phys_epilog(void)
         local_irq_restore(efi_flags);
 }
 
-/*
- * We need to map the EFI memory map again after init_memory_mapping().
- */
-void __init efi_map_memmap(void)
-{
-        memmap.map = __va(memmap.phys_map);
-        memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
-}
-
 void __init efi_reserve_bootmem(void)
 {
         reserve_bootmem_generic((unsigned long)memmap.phys_map,
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index c038b09b1723..9c0ef4945a58 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -808,8 +808,6 @@ void __init setup_arch(char **cmdline_p)
 #ifdef CONFIG_X86_GENERICARCH
         generic_apic_probe();
 #endif
-        if (efi_enabled)
-                efi_map_memmap();
 
 #ifdef CONFIG_ACPI
         /*
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 4ccad185ab7e..697533e86822 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -378,10 +378,8 @@ void __init setup_arch(char **cmdline_p)
        acpi_reserve_bootmem();
 #endif
 
-        if (efi_enabled) {
-                efi_map_memmap();
+        if (efi_enabled)
                 efi_reserve_bootmem();
-        }
 
        /*
         * Find and reserve possible boot-time SMP configuration: