Commit e8c71062 authored by Matt Fleming's avatar Matt Fleming Committed by Ingo Molnar
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x86, efi: Calling __pa() with an ioremap()ed address is invalid

If we encounter an efi_memory_desc_t without EFI_MEMORY_WB set
in ->attribute we currently call set_memory_uc(), which in turn
calls __pa() on a potentially ioremap'd address.

On CONFIG_X86_32 this is invalid, resulting in the following
oops on some machines:

  BUG: unable to handle kernel paging request at f7f22280
  IP: [<c10257b9>] reserve_ram_pages_type+0x89/0x210

  Call Trace:
   [<c104f8ca>] ? page_is_ram+0x1a/0x40
   [<c1025aff>] reserve_memtype+0xdf/0x2f0
   [<c1024dc9>] set_memory_uc+0x49/0xa0
   [<c19334d0>] efi_enter_virtual_mode+0x1c2/0x3aa
   [<c19216d4>] start_kernel+0x291/0x2f2
   [<c19211c7>] ? loglevel+0x1b/0x1b
   [<c19210bf>] i386_start_kernel+0xbf/0xc8

A better approach to this problem is to map the memory region
with the correct attributes from the start, instead of modifying
it after the fact. The uncached case can be handled by
ioremap_nocache() and the cached by ioremap_cache().

Despite first impressions, it's not possible to use
ioremap_cache() to map all cached memory regions on
CONFIG_X86_64 because EFI_RUNTIME_SERVICES_DATA regions really
don't like being mapped into the vmalloc space, as detailed in
the following bug report,

Therefore, we need to ensure that any EFI_RUNTIME_SERVICES_DATA
regions are covered by the direct kernel mapping table on
CONFIG_X86_64. To accomplish this we now map E820_RESERVED_EFI
regions via the direct kernel mapping with the initial call to
init_memory_mapping() in setup_arch(), whereas previously these
regions wouldn't be mapped if they were after the last E820_RAM
region until efi_ioremap() was called. Doing it this way allows
us to delete efi_ioremap() completely.
Signed-off-by: default avatarMatt Fleming <>
Cc: H. Peter Anvin <>
Cc: Matthew Garrett <>
Cc: Zhang Rui <>
Cc: Huang Ying <>
Cc: Linus Torvalds <>
Cc: Andrew Morton <>

Signed-off-by: default avatarIngo Molnar <>
parent 2ded6e6a
......@@ -53,6 +53,13 @@
#define E820_RESERVED_KERN 128
* Address ranges that need to be mapped by the kernel direct
* mapping. This is used to make sure regions such as
* EFI_RUNTIME_SERVICES_DATA are directly mapped. See setup_arch().
#define E820_RESERVED_EFI 129
#ifndef __ASSEMBLY__
#include <linux/types.h>
struct e820entry {
......@@ -115,6 +122,7 @@ static inline void early_memtest(unsigned long start, unsigned long end)
extern unsigned long e820_end_pfn(unsigned long limit_pfn, unsigned type);
extern unsigned long e820_end_of_ram_pfn(void);
extern unsigned long e820_end_of_low_ram_pfn(void);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
......@@ -33,8 +33,6 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...);
#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
efi_call_virt(f, a1, a2, a3, a4, a5, a6)
#define efi_ioremap(addr, size, type) ioremap_cache(addr, size)
#else /* !CONFIG_X86_32 */
extern u64 efi_call0(void *fp);
......@@ -84,9 +82,6 @@ extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
efi_call6((void *)(efi.systab->runtime->f), (u64)(a1), (u64)(a2), \
(u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
u32 type);
#endif /* CONFIG_X86_32 */
extern int add_efi_memmap;
......@@ -135,6 +135,7 @@ static void __init e820_print_type(u32 type)
printk(KERN_CONT "(usable)");
case E820_RESERVED:
printk(KERN_CONT "(reserved)");
case E820_ACPI:
......@@ -783,7 +784,7 @@ u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
* Find the highest page frame number we have available
static unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
unsigned long __init e820_end_pfn(unsigned long limit_pfn, unsigned type)
int i;
unsigned long last_pfn = 0;
......@@ -691,6 +691,8 @@ early_param("reservelow", parse_reservelow);
void __init setup_arch(char **cmdline_p)
unsigned long end_pfn;
#ifdef CONFIG_X86_32
memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
......@@ -932,7 +934,24 @@ void __init setup_arch(char **cmdline_p)
/* max_pfn_mapped is updated here */
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
end_pfn = max_low_pfn;
#ifdef CONFIG_X86_64
* There may be regions after the last E820_RAM region that we
* want to include in the kernel direct mapping, such as
if (efi_enabled) {
unsigned long efi_end;
efi_end = e820_end_pfn(MAXMEM>>PAGE_SHIFT, E820_RESERVED_EFI);
if (efi_end > max_low_pfn)
end_pfn = efi_end;
max_low_pfn_mapped = init_memory_mapping(0, end_pfn << PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
#ifdef CONFIG_X86_64
......@@ -323,10 +323,13 @@ static void __init do_add_efi_memmap(void)
e820_type = E820_UNUSABLE;
e820_type = E820_RESERVED_EFI;
e820_type = E820_RESERVED;
......@@ -671,10 +674,21 @@ void __init efi_enter_virtual_mode(void)
end_pfn = PFN_UP(end);
if (end_pfn <= max_low_pfn_mapped
|| (end_pfn > (1UL << (32 - PAGE_SHIFT))
&& end_pfn <= max_pfn_mapped))
&& end_pfn <= max_pfn_mapped)) {
va = __va(md->phys_addr);
va = efi_ioremap(md->phys_addr, size, md->type);
if (!(md->attribute & EFI_MEMORY_WB)) {
addr = (u64) (unsigned long)va;
npages = md->num_pages;
memrange_efi_to_native(&addr, &npages);
set_memory_uc(addr, npages);
} else {
if (!(md->attribute & EFI_MEMORY_WB))
va = ioremap_nocache(md->phys_addr, size);
va = ioremap_cache(md->phys_addr, size);
md->virt_addr = (u64) (unsigned long) va;
......@@ -684,13 +698,6 @@ void __init efi_enter_virtual_mode(void)
if (!(md->attribute & EFI_MEMORY_WB)) {
addr = md->virt_addr;
npages = md->num_pages;
memrange_efi_to_native(&addr, &npages);
set_memory_uc(addr, npages);
systab = (u64) (unsigned long) efi_phys.systab;
if (md->phys_addr <= systab && systab < end) {
systab += md->virt_addr - md->phys_addr;
......@@ -80,20 +80,3 @@ void __init efi_call_phys_epilog(void)
void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
u32 type)
unsigned long last_map_pfn;
return ioremap(phys_addr, size);
last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
unsigned long top = last_map_pfn << PAGE_SHIFT;
efi_ioremap(top, size - (top - phys_addr), type);
return (void __iomem *)__va(phys_addr);
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