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ARM/KVM: save and restore generic timer registers

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For migration to work we need to save (and later restore) the state of
each core's virtual generic timer.
Since this is per VCPU, we can use the [gs]et_one_reg ioctl and export
the three needed registers (control, counter, compare value).
Though they live in cp15 space, we don't use the existing list, since
they need special accessor functions and the arch timer is optional.

Acked-by: Marc Zynger <marc.zyngier@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Andre Przywara
2013-12-13 14:23:26 +01:00
committed by Christoffer Dall
parent a1a64387ad
commit 39735a3a39
5 changed files with 166 additions and 1 deletions
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arch/arm/include/asm/kvm_host.h
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@@ -225,4 +225,7 @@ static inline int kvm_arch_dev_ioctl_check_extension(long ext)
int kvm_perf_init(void);
int kvm_perf_teardown(void);
u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
#endif /* __ARM_KVM_HOST_H__ */