diff options
| author | Lorenzo Pieralisi <[email protected]> | 2014-05-08 17:31:40 +0100 |
|---|---|---|
| committer | Russell King <[email protected]> | 2014-05-25 23:49:27 +0100 |
| commit | 0e0779da2233f2dfc85e9c3a6ea142476d326811 (patch) | |
| tree | 8222330d72936e63a8cec7d45956cb669bed6d14 /arch/arm/include/asm/assembler.h | |
| parent | 72e6ae285a1dbff553734985bedadf409d99c02d (diff) | |
ARM: 8053/1: kernel: sleep: restore HYP mode configuration in cpu_resume
On CPUs with virtualization extensions the kernel installs HYP mode
configuration on both primary and secondary cpus upon cold boot.
On platforms where CPUs are shutdown in idle paths (ie CPU core gating),
when a CPU resumes from low-power states it currently does not execute
code that reinstalls the HYP configuration, which means that the kernel
cannot run eg KVM properly on such machines.
This patch, mirroring cold-boot behaviour, executes position independent
code that reinstalls HYP configuration and drops to SVC mode safely on
warmboot, so that deep idle states can be enabled in kernel running as
hosts on platforms with power management HW.
Cc: Christoffer Dall <[email protected]>
Cc: Dave Martin <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Nicolas Pitre <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Reviewed-by: Dave Martin <[email protected]>
Signed-off-by: Russell King <[email protected]>
Diffstat (limited to 'arch/arm/include/asm/assembler.h')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index b974184f9941..57f0584e8d97 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -312,7 +312,7 @@ * you cannot return to the original mode. */ .macro safe_svcmode_maskall reg:req -#if __LINUX_ARM_ARCH__ >= 6 +#if __LINUX_ARM_ARCH__ >= 6 && !defined(CONFIG_CPU_V7M) mrs \reg , cpsr eor \reg, \reg, #HYP_MODE tst \reg, #MODE_MASK |