linux-kernel - Re: [PATCH] KVM: x86: Fixes posted interrupt check for IRQs delivery modes

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Date:   Fri, 1 May 2020 00:44:37 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     pbonzini@...hat.com, joro@...tes.org, jon.grimm@....com,
        Alexander Graf <graf@...zon.com>
Subject: Re: [PATCH] KVM: x86: Fixes posted interrupt check for IRQs delivery
 modes

Ping.

Thanks,
Suravee

On 4/7/20 1:13 PM, Suravee Suthikulpanit wrote:
> Current logic incorrectly uses the enum ioapic_irq_destination_types
> to check the posted interrupt destination types. However, the value was
> set using APIC_DM_XXX macros, which are left-shifted by 8 bits.
> 
> Fixes by using the APIC_DM_FIXED and APIC_DM_LOWEST instead.
> 
> Fixes: (fdcf75621375 'KVM: x86: Disable posted interrupts for non-standard IRQs delivery modes')
> Cc: Alexander Graf <graf@...zon.com>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>   arch/x86/include/asm/kvm_host.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 98959e8..f15e5b3 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1664,8 +1664,8 @@ void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
>   static inline bool kvm_irq_is_postable(struct kvm_lapic_irq *irq)
>   {
>   	/* We can only post Fixed and LowPrio IRQs */
> -	return (irq->delivery_mode == dest_Fixed ||
> -		irq->delivery_mode == dest_LowestPrio);
> +	return (irq->delivery_mode == APIC_DM_FIXED ||
> +		irq->delivery_mode == APIC_DM_LOWEST);
>   }
>   
>   static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
>