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785a19f9d1
linux/arch/arm64
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Chintan Pandya 785a19f9d1 ioremap: Update pgtable free interfaces with addr 
The following kernel panic was observed on ARM64 platform due to a stale
TLB entry.

 1. ioremap with 4K size, a valid pte page table is set.
 2. iounmap it, its pte entry is set to 0.
 3. ioremap the same address with 2M size, update its pmd entry with
    a new value.
 4. CPU may hit an exception because the old pmd entry is still in TLB,
    which leads to a kernel panic.

Commit b6bdb7517c ("mm/vmalloc: add interfaces to free unmapped page
table") has addressed this panic by falling to pte mappings in the above
case on ARM64.

To support pmd mappings in all cases, TLB purge needs to be performed
in this case on ARM64.

Add a new arg, 'addr', to pud_free_pmd_page() and pmd_free_pte_page()
so that TLB purge can be added later in seprate patches.

[toshi.kani@hpe.com: merge changes, rewrite patch description]
Fixes: 28ee90fe60 ("x86/mm: implement free pmd/pte page interfaces")
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: mhocko@suse.com
Cc: akpm@linux-foundation.org
Cc: hpa@zytor.com
Cc: linux-mm@kvack.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will.deacon@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: stable@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20180627141348.21777-3-toshi.kani@hpe.com
2018-07-04 21:37:08 +02:00
..
boot ARM64: hisi fixes for 4.18 2018-06-29 14:06:49 -07:00
configs arm64: defconfig: renormalize based on recent additions 2018-06-23 10:24:25 -07:00
crypto crypto: arm64/aes-blk - fix and move skcipher_walk_done out of kernel_neon_begin, _end 2018-06-15 23:06:46 +08:00
include arm64: Remove unnecessary ISBs from set_{pte,pmd,pud} 2018-06-27 18:26:20 +01:00
kernel arm64: Avoid flush_icache_range() in alternatives patching code 2018-06-27 18:21:53 +01:00
kvm KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus 2018-06-21 09:14:44 +01:00
lib arm64: export tishift functions to modules 2018-05-21 19:00:48 +01:00
mm ioremap: Update pgtable free interfaces with addr 2018-07-04 21:37:08 +02:00
net bpf, arm64: save 4 bytes in prologue when ebpf insns came from cbpf 2018-05-14 19:11:45 -07:00
xen arm64: mm: Add additional parameter to uaccess_ttbr0_disable 2018-01-17 13:57:49 +01:00
Kconfig Kbuild: rename HAVE_CC_STACKPROTECTOR config variable 2018-06-15 07:15:28 +09:00
Kconfig.debug
Kconfig.platforms arm64: dts: renesas: Add Renesas R8A77990 Kconfig support 2018-05-16 10:44:01 +02:00
Makefile arm64: move GCC version check for ARCH_SUPPORTS_INT128 to Kconfig 2018-06-08 18:56:02 +09:00