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linux-stable/arch/arm64
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Dmitry Safonov 739586951b arm64/vdso: Support mremap() for vDSO 
vDSO VMA address is saved in mm_context for the purpose of using
restorer from vDSO page to return to userspace after signal handling.

In Checkpoint Restore in Userspace (CRIU) project we place vDSO VMA
on restore back to the place where it was on the dump.
With the exception for x86 (where there is API to map vDSO with
arch_prctl()), we move vDSO inherited from CRIU task to restoree
position by mremap().

CRIU does support arm64 architecture, but kernel doesn't update
context.vdso pointer after mremap(). Which results in translation
fault after signal handling on restored application:
https://github.com/xemul/criu/issues/288

Make vDSO code track the VMA address by supplying .mremap() fops
the same way it's done for x86 and arm32 by:
commit b059a453b1 ("x86/vdso: Add mremap hook to vm_special_mapping")
commit 280e87e98c ("ARM: 8683/1: ARM32: Support mremap() for sigpage/vDSO").

Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-08-09 12:16:28 +01:00
..
boot Allwinner fixes for 4.13 2017-08-04 13:04:42 +02:00
configs arm64: defconfig: enable missing HWSPINLOCK 2017-07-27 23:09:54 -05:00
crypto crypto: arm64/sha - avoid non-standard inline asm tricks 2017-05-18 13:19:52 +08:00
include arm64: uaccess: Implement *_flushcache variants 2017-08-09 12:16:26 +01:00
kernel arm64/vdso: Support mremap() for vDSO 2017-08-09 12:16:28 +01:00
kvm KVM: arm/arm64: PMU: Fix overflow interrupt injection 2017-07-25 14:18:01 +01:00
lib arm64: uaccess: Implement *_flushcache variants 2017-08-09 12:16:26 +01:00
mm arm64: Implement pmem API support 2017-08-09 12:15:45 +01:00
net arm64 updates for 4.13: 2017-07-05 17:09:27 -07:00
xen xen/privcmd: Add IOCTL_PRIVCMD_DM_OP 2017-02-14 15:13:43 -05:00
Kconfig arm64: uaccess: Implement *_flushcache variants 2017-08-09 12:16:26 +01:00
Kconfig.debug arm64: relocation testing module 2017-04-04 17:03:32 +01:00
Kconfig.platforms ARM: SoC 64-bit changes 2017-07-04 14:53:26 -07:00
Makefile arm64: pass endianness info to sparse 2017-06-26 10:15:06 +01:00