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authorCatalin Marinas <catalin.marinas@arm.com>2014-02-04 16:01:31 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-20 11:06:11 -0800
commitf35f27e775d6f8aa265fb698975c9c95f2757ef4 (patch)
tree4fc18801a58a85af2d5000bf6ecbaa93bb4f0808 /arch
parent6737eaebff6297e5b6aeb458a4b4ad4b61df8f57 (diff)
downloadlinaro-lsk-f35f27e775d6f8aa265fb698975c9c95f2757ef4.tar.gz
arm64: Invalidate the TLB when replacing pmd entries during boot
commit a55f9929a9b257f84b6cc7b2397379cabd744a22 upstream. With the 64K page size configuration, __create_page_tables in head.S maps enough memory to get started but using 64K pages rather than 512M sections with a single pgd/pud/pmd entry pointing to a pte table. create_mapping() may override the pgd/pud/pmd table entry with a block (section) one if the RAM size is more than 512MB and aligned correctly. For the end of this block to be accessible, the old TLB entry must be invalidated. Reported-by: Mark Salter <msalter@redhat.com> Tested-by: Mark Salter <msalter@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm64/mm/mmu.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 80a369eab63..ba7477efad5 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -203,10 +203,18 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
do {
next = pmd_addr_end(addr, end);
/* try section mapping first */
- if (((addr | next | phys) & ~SECTION_MASK) == 0)
+ if (((addr | next | phys) & ~SECTION_MASK) == 0) {
+ pmd_t old_pmd =*pmd;
set_pmd(pmd, __pmd(phys | prot_sect_kernel));
- else
+ /*
+ * Check for previous table entries created during
+ * boot (__create_page_tables) and flush them.
+ */
+ if (!pmd_none(old_pmd))
+ flush_tlb_all();
+ } else {
alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys));
+ }
phys += next - addr;
} while (pmd++, addr = next, addr != end);
}