diff options
| author | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2013-08-05 15:04:46 +0100 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2014-03-10 13:38:36 +0800 |
| commit | 582ae86b286ac72bce852737882a0bfd20f3b864 (patch) | |
| tree | 16ded74d4cba2997a24fbb114b3191d6c7e5ac80 /arch | |
| parent | 82c76f166d477c49c22d05688385041b9a8a74de (diff) | |
arm: kvm: implement CPU PM notifier
Upon CPU shutdown and consequent warm-reboot, the hypervisor CPU state
must be re-initialized. This patch implements a CPU PM notifier that
upon warm-boot calls a KVM hook to reinitialize properly the hypervisor
state so that the CPU can be safely resumed.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kvm/arm.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index ef1703b9587b..1d55afe7fd4b 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -17,6 +17,7 @@ */ #include <linux/cpu.h> +#include <linux/cpu_pm.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/kvm_host.h> @@ -835,6 +836,33 @@ static struct notifier_block hyp_init_cpu_nb = { .notifier_call = hyp_init_cpu_notify, }; +#ifdef CONFIG_CPU_PM +static int hyp_init_cpu_pm_notifier(struct notifier_block *self, + unsigned long cmd, + void *v) +{ + if (cmd == CPU_PM_EXIT) { + cpu_init_hyp_mode(NULL); + return NOTIFY_OK; + } + + return NOTIFY_DONE; +} + +static struct notifier_block hyp_init_cpu_pm_nb = { + .notifier_call = hyp_init_cpu_pm_notifier, +}; + +static void __init hyp_cpu_pm_init(void) +{ + cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); +} +#else +static inline void hyp_cpu_pm_init(void) +{ +} +#endif + /** * Inits Hyp-mode on all online CPUs */ @@ -995,6 +1023,8 @@ int kvm_arch_init(void *opaque) goto out_err; } + hyp_cpu_pm_init(); + kvm_coproc_table_init(); return 0; out_err: |