Re: [PATCH] KVM: SVM: unconditionally wake up VCPU on IOMMU interrupt

[Radim KrÄmÃÅ]

2017-10-10 12:57+0200, Paolo Bonzini:
> Checking the mode is unnecessary, and is done without a memory barrier
> separating the LAPIC write from the vcpu->mode read; in addition,
> kvm_vcpu_wake_up is already doing a check for waiters on the wait queue
> that has the same effect.
> 
> In practice it's safe because spin_lock has full-barrier semantics on x86,
> but don't be too clever.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> ---

Reviewed-by: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>