Re: [PATCH 4.19 08/57] KVM: x86: Fix split-irqchip vs interrupt injection window request

[Pavel Machek]

Hi!

> - in order to tell userspace we will inject its interrupt ("IRQ
>   window open" i.e. kvm_vcpu_ready_for_interrupt_injection), both
>   KVM and the vCPU need to be ready to accept the interrupt.
> 
> ... and this is what the patch implements.
> 
> Reported-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Analyzed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

This makes no difference for -stable, but the patch is confused about
types:

> +++ b/arch/x86/kvm/x86.c
> @@ -3351,21 +3351,23 @@ static int kvm_vcpu_ioctl_set_lapic(stru
>  
>  static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu)
>  {
> +	/*
> +	 * We can accept userspace's request for interrupt injection
> +	 * as long as we have a place to store the interrupt number.
> +	 * The actual injection will happen when the CPU is able to
> +	 * deliver the interrupt.
> +	 */
> +	if (kvm_cpu_has_extint(vcpu))
> +		return false;

Since function is "static int" it should probably return 0.

Best regards,
								Pavel
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