ARM: 8667/3: Fix memory attribute inconsistencies when using fixmap

To cope with the variety in ARM architectures and configurations, the
pagetable attributes for kernel memory are generated at runtime to match
the system the kernel finds itself on. This calculated value is stored
in pgprot_kernel.

However, when early fixmap support was added for ARM (commit
a5f4c561b3b1) the attributes used for mappings were hard coded because
pgprot_kernel is not set up early enough. Unfortunately, when fixmap is
used after early boot this means the memory being mapped can have
different attributes to existing mappings, potentially leading to
unpredictable behaviour. A specific problem also exists due to the hard
coded values not include the 'shareable' attribute which means on
systems where this matters (e.g. those with multiple CPU clusters) the
cache contents for a memory location can become inconsistent between
CPUs.

To resolve these issues we change fixmap to use the same memory
attributes (from pgprot_kernel) that the rest of the kernel uses. To
enable this we need to refactor the initialisation code so
build_mem_type_table() is called early enough. Note, that relies on early
param parsing for memory type overrides passed via the kernel command
line, so we need to make sure this call is still after
parse_early_params().

[ardb: keep early_fixmap_init() before param parsing, for earlycon]

Fixes: a5f4c561b3b1 ("ARM: 8415/1: early fixmap support for earlycon")
Cc: <stable@vger.kernel.org> # v4.3+
Tested-by: afzal mohammed <afzal.mohd.ma@gmail.com>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
index 5c17d2dec777f627eaf6b706f92053065d5fa06b..8f967d1373f67ba96beeb1f70357ecce6a7bc95b 100644 (file)
--- a/arch/arm/include/asm/fixmap.h
+++ b/arch/arm/include/asm/fixmap.h
@@ -41,7 +41,7 @@ static const enum fixed_addresses __end_of_fixed_addresses =
 
 #define FIXMAP_PAGE_COMMON     (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY)
 
-#define FIXMAP_PAGE_NORMAL     (FIXMAP_PAGE_COMMON | L_PTE_MT_WRITEBACK)
+#define FIXMAP_PAGE_NORMAL     (pgprot_kernel | L_PTE_XN)
 #define FIXMAP_PAGE_RO         (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY)
 
 /* Used by set_fixmap_(io|nocache), both meant for mapping a device */

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index f4e54503afa9587106fad19c0932273f81995993..32e1a9513dc70eba4787ca1af0ba3e32b9f29d7e 100644 (file)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -80,7 +80,7 @@ __setup("fpe=", fpe_setup);
 
 extern void init_default_cache_policy(unsigned long);
 extern void paging_init(const struct machine_desc *desc);
-extern void early_paging_init(const struct machine_desc *);
+extern void early_mm_init(const struct machine_desc *);
 extern void adjust_lowmem_bounds(void);
 extern enum reboot_mode reboot_mode;
 extern void setup_dma_zone(const struct machine_desc *desc);
@@ -1088,7 +1088,7 @@ void __init setup_arch(char **cmdline_p)
        parse_early_param();
 
 #ifdef CONFIG_MMU
-       early_paging_init(mdesc);
+       early_mm_init(mdesc);
 #endif
        setup_dma_zone(mdesc);
        xen_early_init();

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4e016d7f37b3af6568282aa1a909a14406247bb2..347cca9657838bb9f937cbeb8ad9d6bcaae6de6f 100644 (file)
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -414,6 +414,11 @@ void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
                     FIXADDR_END);
        BUG_ON(idx >= __end_of_fixed_addresses);
 
+       /* we only support device mappings until pgprot_kernel has been set */
+       if (WARN_ON(pgprot_val(prot) != pgprot_val(FIXMAP_PAGE_IO) &&
+                   pgprot_val(pgprot_kernel) == 0))
+               return;
+
        if (pgprot_val(prot))
                set_pte_at(NULL, vaddr, pte,
                        pfn_pte(phys >> PAGE_SHIFT, prot));
@@ -1492,7 +1497,7 @@ pgtables_remap lpae_pgtables_remap_asm;
  * early_paging_init() recreates boot time page table setup, allowing machines
  * to switch over to a high (>4G) address space on LPAE systems
  */
-void __init early_paging_init(const struct machine_desc *mdesc)
+static void __init early_paging_init(const struct machine_desc *mdesc)
 {
        pgtables_remap *lpae_pgtables_remap;
        unsigned long pa_pgd;
@@ -1560,7 +1565,7 @@ void __init early_paging_init(const struct machine_desc *mdesc)
 
 #else
 
-void __init early_paging_init(const struct machine_desc *mdesc)
+static void __init early_paging_init(const struct machine_desc *mdesc)
 {
        long long offset;
 
@@ -1616,7 +1621,6 @@ void __init paging_init(const struct machine_desc *mdesc)
 {
        void *zero_page;
 
-       build_mem_type_table();
        prepare_page_table();
        map_lowmem();
        memblock_set_current_limit(arm_lowmem_limit);
@@ -1636,3 +1640,9 @@ void __init paging_init(const struct machine_desc *mdesc)
        empty_zero_page = virt_to_page(zero_page);
        __flush_dcache_page(NULL, empty_zero_page);
 }
+
+void __init early_mm_init(const struct machine_desc *mdesc)
+{
+       build_mem_type_table();
+       early_paging_init(mdesc);
+}