KVM: s390: Clear valid_wakeup in kvm_s390_handle_wait(), not in arch hook

Move the clearing of valid_wakeup from kvm_arch_vcpu_block_finish() so
that a future patch can drop said arch hook.  Unlike the other blocking-
related arch hooks, vcpu_blocking/unblocking(), vcpu_block_finish() needs
to be called even if the KVM doesn't actually block the vCPU.  This will
allow future patches to differentiate between truly blocking the vCPU and
emulating a halt condition without introducing a contradiction.

Alternatively, the hook could be renamed to kvm_arch_vcpu_halt_finish(),
but there's literally one call site in s390, and future cleanup can also
be done to handle valid_wakeup fully within kvm_s390_handle_wait() and
allow generic KVM to drop vcpu_valid_wakeup().

No functional change intended.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211009021236.4122790-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 1aa0948..3c8246f 100644 (file)
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1336,6 +1336,7 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 no_timer:
        srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
        kvm_vcpu_block(vcpu);
+       vcpu->valid_wakeup = false;
        __unset_cpu_idle(vcpu);
        vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
 

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 9653e40..8f577c7 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5049,7 +5049,7 @@ static inline unsigned long nonhyp_mask(int i)
 
 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
 {
-       vcpu->valid_wakeup = false;
+
 }
 
 static int __init kvm_s390_init(void)