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KVM: Add kvm_arch_vcpu_{un}blocking callbacks

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Some times it is useful for architecture implementations of KVM to know
when the VCPU thread is about to block or when it comes back from
blocking (arm/arm64 needs to know this to properly implement timers, for
example).

Therefore provide a generic architecture callback function in line with
what we do elsewhere for KVM generic-arch interactions.

Reviewed-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Christoffer Dall 2015-08-27 16:41:15 +02:00
commit 3217f7c25b
8 changed files with 20 additions and 0 deletions
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3
virt/kvm/kvm_main.c
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@ -2018,6 +2018,8 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
} while (single_task_running() && ktime_before(cur, stop));
}
kvm_arch_vcpu_blocking(vcpu);
for (;;) {
prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
@ -2031,6 +2033,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
finish_wait(&vcpu->wq, &wait);
cur = ktime_get();
kvm_arch_vcpu_unblocking(vcpu);
out:
block_ns = ktime_to_ns(cur) - ktime_to_ns(start);