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Julien Grall 0b61f2c0f3 arm/xen: Enable user access to the kernel before issuing a privcmd call 
When Xen is copying data to/from the guest it will check if the kernel
has the right to do the access. If not, the hypercall will return an
error.

After the commit a5e090acbf "ARM:
software-based privileged-no-access support", the kernel can't access
any longer the user space by default. This will result to fail on every
hypercall made by the userspace (i.e via privcmd).

We have to enable the userspace access and then restore the correct
permission every time the privcmd is used to made an hypercall.

I didn't find generic helpers to do a these operations, so the change
is only arm32 specific.

Reported-by: Riku Voipio <riku.voipio@linaro.org>
Signed-off-by: Julien Grall <julien.grall@citrix.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-09-11 18:50:03 +01:00
..
boot ARM: SoC: late fixes and dependencies 2015-07-02 14:40:49 -07:00
common TTY/Serial driver patches for 4.2-rc1 2015-06-26 15:53:22 -07:00
configs ARM: multi_v7_defconfig: Enable BRCMNAND driver 2015-07-01 13:04:13 -07:00
crypto
firmware
include ARM: domains: add memory dependencies to get_domain/set_domain 2015-09-11 16:08:18 +01:00
kernel ARM: uaccess: fix undefined instruction on ARMv7M/noMMU 2015-09-09 23:26:44 +01:00
kvm Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-06-26 12:20:00 -07:00
lib ARM: software-based priviledged-no-access support 2015-08-26 20:34:24 +01:00
mach-alpine
mach-asm9260
mach-at91 genalloc: rename dev_get_gen_pool() to gen_pool_get() 2015-06-30 19:45:01 -07:00
mach-axxia
mach-bcm ARM: BCM: Do not select CONFIG_MTD_NAND_BRCMNAND 2015-07-01 13:04:13 -07:00
mach-berlin ARM: SoC: driver updates for v4.2 2015-06-26 11:54:29 -07:00
mach-clps711x
mach-cns3xxx
mach-davinci ARM: SoC cleanups for v4.2 2015-06-26 11:08:27 -07:00
mach-digicolor
mach-dove ARM: dove: fix legacy dove IRQ numbers 2015-06-24 11:05:57 +02:00
mach-ebsa110
mach-efm32
mach-ep93xx ARM: ep93xx: simone: support for SPI-based MMC/SD cards 2015-06-11 14:21:29 -07:00
mach-exynos The changes to the common clock framework for 4.2 are dominated by new 2015-07-01 19:22:00 -07:00
mach-footbridge
mach-gemini ARM: gemini: Fix race in installing GPIO chained IRQ handler 2015-06-18 14:03:08 +02:00
mach-highbank
mach-hisi arm/mach-hisi: remove legacy __CPUINIT section that crept in 2015-06-16 14:12:21 -04:00
mach-imx genalloc: rename dev_get_gen_pool() to gen_pool_get() 2015-06-30 19:45:01 -07:00
mach-integrator
mach-iop13xx
mach-iop32x
mach-iop33x
mach-ixp4xx
mach-keystone Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-06-26 12:20:00 -07:00
mach-ks8695
mach-lpc18xx
mach-lpc32xx Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-01 15:19:35 -07:00
mach-mediatek
mach-meson
mach-mmp
mach-moxart
mach-mv78xx0
mach-mvebu ARM: SoC: late fixes and dependencies 2015-07-02 14:40:49 -07:00
mach-mxs
mach-netx
mach-nomadik
mach-nspire
mach-omap1 ARM: SoC: platform support for v4.2 2015-06-26 11:34:35 -07:00
mach-omap2 - hwspinlock core DT support from Suman Anna 2015-07-03 14:52:25 -07:00
mach-orion5x
mach-picoxcell
mach-prima2
mach-pxa ARM: SoC: platform support for v4.2 2015-06-26 11:34:35 -07:00
mach-qcom
mach-realview
mach-rockchip Remove __cpuinit macros and users. 2015-07-02 09:54:14 -07:00
mach-rpc
mach-s3c24xx
mach-s3c64xx
mach-s5pv210
mach-sa1100 Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-06-26 12:20:00 -07:00
mach-shmobile ARM: SoC: platform support for v4.2 2015-06-26 11:34:35 -07:00
mach-socfpga genalloc: rename dev_get_gen_pool() to gen_pool_get() 2015-06-30 19:45:01 -07:00
mach-spear
mach-sti
mach-stm32
mach-sunxi
mach-tegra ARM: SoC: platform support for v4.2 2015-06-26 11:34:35 -07:00
mach-u300
mach-uniphier
mach-ux500
mach-versatile
mach-vexpress arm: don't use module_init in non-modular mach-vexpress/spc.c code 2015-06-16 14:12:29 -04:00
mach-vt8500
mach-w90x900
mach-zx
mach-zynq ARM: SoC: platform support for v4.2 2015-06-26 11:34:35 -07:00
mm ARM: entry: provide uaccess assembly macro hooks 2015-08-26 20:27:02 +01:00
net
nwfpe ARM: swpan: fix nwfpe for uaccess changes 2015-09-09 23:26:11 +01:00
oprofile
plat-iop
plat-omap
plat-orion
plat-pxa
plat-samsung ARM: SAMSUNG: Constify platform_device_id 2015-06-06 02:18:02 +09:00
plat-versatile
probes
tools
vdso ARM: 8384/1: VDSO: force use of BFD linker 2015-06-06 10:37:12 +01:00
vfp
xen arm/xen: Enable user access to the kernel before issuing a privcmd call 2015-09-11 18:50:03 +01:00
Kconfig ARM: software-based priviledged-no-access support 2015-08-26 20:34:24 +01:00
Kconfig-nommu
Kconfig.debug Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-06-26 12:20:00 -07:00
Makefile Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-06-26 12:20:00 -07:00