KVM: arm64: arch_timer: Make vtimer_irqbypass a Distributor attr

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K89F


CVE: NA

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Having the vtimer_irqbypass flag in the per-vcpu structure is actually
pointless, as we will keep the vtimer interrupt delivery capability the
same among all vcpus (either direct injection via MBIGEN-ITS-RDist, or
purely emulated by KVM).

Let's instead make it a Distributor attribute. This way, we configure the
vtimer information for *all* vcpus in kvm_vtimer_config(), in one go.
Otherwise we need to configure it for each vcpu in its first run (we may
end-up missing the activation of vtimer interrupt for some vcpus whose
vtimer_info hasn't been configures yet, and bad things will happen...).

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>