Marc Zyngier b20c9f29c5 arm/arm64: KVM: detect CPU reset on CPU_PM_EXIT ... Commit 1fcf7ce0c6 (arm: kvm: implement CPU PM notifier) added support for CPU power-management, using a cpu_notifier to re-init KVM on a CPU that entered CPU idle. The code assumed that a CPU entering idle would actually be powered off, loosing its state entierely, and would then need to be reinitialized. It turns out that this is not always the case, and some HW performs CPU PM without actually killing the core. In this case, we try to reinitialize KVM while it is still live. It ends up badly, as reported by Andre Przywara (using a Calxeda Midway): [ 3.663897] Kernel panic - not syncing: unexpected prefetch abort in Hyp mode at: 0x685760 [ 3.663897] unexpected data abort in Hyp mode at: 0xc067d150 [ 3.663897] unexpected HVC/SVC trap in Hyp mode at: 0xc0901dd0 The trick here is to detect if we've been through a full re-init or not by looking at HVBAR (VBAR_EL2 on arm64). This involves implementing the backend for __hyp_get_vectors in the main KVM HYP code (rather small), and checking the return value against the default one when the CPU notifier is called on CPU_PM_EXIT. Reported-by: Andre Przywara <osp@andrep.de> Tested-by: Andre Przywara <osp@andrep.de> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Rob Herring <rob.herring@linaro.org> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2014-02-27 19:27:10 +01:00
..
boot	A collection of ARM SoC fixes for v3.14-rc1.	2014-02-15 15:01:33 -08:00
common	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
configs	ARM: multi_v7_defconfig: Select CONFIG_SOC_DRA7XX	2014-02-10 10:38:06 -08:00
crypto	CRYPTO: Fix more AES build errors	2014-01-05 13:59:56 +00:00
firmware	ARM: add basic support for Trusted Foundations	2013-12-13 12:50:30 -07:00
include	Merge branches 'fixes' and 'misc' into for-linus	2014-01-28 21:38:48 +00:00
kernel	Merge branches 'fixes' and 'misc' into for-linus	2014-01-28 21:38:48 +00:00
kvm	arm/arm64: KVM: detect CPU reset on CPU_PM_EXIT	2014-02-27 19:27:10 +01:00
lib	ARM: 7877/1: use built-in byte swap function	2013-12-29 12:32:45 +00:00
mach-at91	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-bcm	ARM: pinctrl: Add Broadcom Capri pinctrl driver	2014-01-16 14:25:38 +01:00
mach-bcm2835	ARM: bcm2835: Fix grammar in help message	2014-01-02 12:07:52 -08:00
mach-berlin	ARM: add initial support for Marvell Berlin SoCs	2013-12-13 16:31:07 +01:00
mach-clps711x	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-cns3xxx
mach-davinci	ARM: driver updates for 3.14	2014-01-23 18:49:36 -08:00
mach-dove	ARM: Dove: Fix compiler warnings with C=1 builds	2013-11-24 02:36:55 +00:00
mach-ebsa110
mach-efm32	ARM: new platform for Energy Micro's EFM32 Cortex-M3 SoCs	2013-12-16 17:51:33 +01:00
mach-ep93xx	ARM: ep93xx: use soc bus	2013-11-25 14:24:28 -08:00
mach-exynos	ACPI and power management updates for 3.14-rc1	2014-01-24 15:51:02 -08:00
mach-footbridge	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2014-01-24 17:17:30 -08:00
mach-gemini	GPIO bulk changes for the v3.13 development cycle	2013-11-12 15:50:46 +09:00
mach-highbank	Merge branches 'amba', 'fixes', 'kees', 'misc' and 'unstable/sa11x0' into for-next	2014-01-21 21:26:33 +00:00
mach-hisi	ARM: hisi: fix kconfig warning on HAVE_ARM_TWD	2014-02-02 19:52:42 -08:00
mach-imx	ARM: imx6: Initialize low-power mode early again	2014-02-10 10:37:32 -08:00
mach-integrator	ARM: integrator: restore static map on the CP	2014-01-31 14:58:52 -08:00
mach-iop13xx	dmaengine: remove DMA unmap from drivers	2013-11-14 11:04:38 -08:00
mach-iop32x	ARM: iop32x: fix power off handling for the EM7210 board	2014-01-31 14:58:53 -08:00
mach-iop33x
mach-ixp4xx	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-keystone	ARM: keystone: config: fix build warning when CONFIG_DMADEVICES is not set	2014-01-31 15:03:53 -08:00
mach-kirkwood	mvebu fixes for v3.13 (incremental #2)	2014-01-31 14:59:28 -08:00
mach-ks8695	ARM: ks8695: delete local <mach/gpio.h> header	2013-12-03 11:26:05 +01:00
mach-lpc32xx	ARM: lpc32xx: move custom GPIO header	2013-12-03 11:26:06 +01:00
mach-mmp	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-moxart	ARM: moxart: move DMA_OF selection to driver	2014-02-02 19:52:45 -08:00
mach-msm	ARM: driver updates for 3.14	2014-01-23 18:49:36 -08:00
mach-mv78xx0	ARM: mv78xx0: delete local <mach/gpio.h> header	2013-12-03 11:26:06 +01:00
mach-mvebu	mvebu fixes for v3.13 (incremental #2)	2014-01-31 14:59:28 -08:00
mach-mxs	ARM: SoC DT updates for 3.13	2013-11-11 17:34:56 +09:00
mach-netx
mach-nomadik	ARM: nomadik: get rid of explicit ethernet GPIO management	2013-11-28 21:08:42 +01:00
mach-nspire
mach-omap1	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-omap2	ARM: fix HAVE_ARM_TWD selection for OMAP and shmobile	2014-02-02 19:52:53 -08:00
mach-orion5x	ARM: orion5x: drop unused include from common.c	2013-11-24 03:02:20 +00:00
mach-picoxcell
mach-prima2	ARM: clean up cache handling in platform code	2013-12-11 16:24:34 -08:00
mach-pxa	ARM: pxa: fix various compilation problems	2014-02-10 10:33:04 -08:00
mach-realview
mach-rockchip	ARM: SoC board updates for 3.13	2013-11-11 16:57:16 +09:00
mach-rpc
mach-s3c24xx	ARM: SoC cleanups for 3.14	2014-01-23 18:36:55 -08:00
mach-s3c64xx	ARM: SoC cleanups for 3.14	2014-01-23 18:36:55 -08:00
mach-s5p64x0
mach-s5pc100
mach-s5pv210	pwm: Changes for v3.13-rc1	2013-11-16 12:21:40 -08:00
mach-sa1100	ACPI and power management updates for 3.14-rc1	2014-01-24 15:51:02 -08:00
mach-shmobile	ARM: fix HAVE_ARM_TWD selection for OMAP and shmobile	2014-02-02 19:52:53 -08:00
mach-socfpga	arm: socfpga: Enable ARM_TWD for socfpga	2013-12-03 14:19:48 -08:00
mach-spear
mach-sti	ARM: clean up cache handling in platform code	2013-12-11 16:24:34 -08:00
mach-sunxi	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-tegra	ARM: driver updates for 3.14	2014-01-23 18:49:36 -08:00
mach-u300	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
mach-ux500	ARM: SoC DT updates for 3.14	2014-01-23 18:45:38 -08:00
mach-versatile	ARM: versatile: move GPIO2 and GPIO3 to core	2013-12-20 18:22:47 +01:00
mach-vexpress	ARM: vexpress/TC2: Implement MCPM power_down_finish()	2013-11-25 14:12:14 -08:00
mach-virt
mach-vt8500
mach-w90x900
mach-zynq	ARM: zynq: Reserve not DMAable space in front of the kernel	2014-02-10 10:45:42 -08:00
mm	Merge branches 'fixes' and 'misc' into for-linus	2014-01-28 21:38:48 +00:00
net	bpf: do not use reciprocal divide	2014-01-15 17:02:08 -08:00
nwfpe
oprofile
plat-iop	Merge branch 'soc/sched_clock' into next/soc	2013-12-06 08:05:55 -08:00
plat-omap	Merge branch 'efm32/soc' into next/soc	2013-12-20 08:59:30 -08:00
plat-orion	mvebu fixes for v3.13 (incremental #2)	2014-01-31 14:59:28 -08:00
plat-pxa	ARM: pxa: remove IRQF_DISABLED	2013-12-11 17:32:41 -08:00
plat-samsung	MTD updates for 3.14:	2014-01-28 18:56:37 -08:00
plat-versatile	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
tools
vfp	ARM: 7873/1: vfp: clear vfp_current_hw_state for dying cpu	2013-10-30 22:10:10 +00:00
xen	xen/gnttab: Use phys_addr_t to describe the grant frame base address	2014-01-30 12:56:34 +00:00
Kconfig	Bug-fixes:	2014-01-31 08:38:18 -08:00
Kconfig-nommu
Kconfig.debug	ARM: SoC platform changes for 3.14	2014-01-23 18:40:49 -08:00
Makefile	Merge branches 'fixes' and 'misc' into for-linus	2014-01-28 21:38:48 +00:00