linux-kernel - Re: [PATCH v3 5/5] KVM: X86: Fix callers of kvm_apic_match

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Date:   Tue, 03 Dec 2019 14:23:47 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org
Cc:     Nitesh Narayan Lal <nitesh@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] KVM: X86: Fix callers of kvm_apic_match_dest() to use correct macros

Peter Xu <peterx@...hat.com> writes:

> Callers of kvm_apic_match_dest() should always pass in APIC_DEST_*
> macros for either dest_mode and short_hand parameters.  Fix up all the
> callers of kvm_apic_match_dest() that are not following the rule.
>
> Reported-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Reported-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  arch/x86/kvm/ioapic.c   | 11 +++++++----
>  arch/x86/kvm/irq_comm.c |  3 ++-
>  2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c
> index 901d85237d1c..1082ca8d11e5 100644
> --- a/arch/x86/kvm/ioapic.c
> +++ b/arch/x86/kvm/ioapic.c
> @@ -108,8 +108,9 @@ static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
>  	union kvm_ioapic_redirect_entry *e;
>  
>  	e = &ioapic->redirtbl[RTC_GSI];
> -	if (!kvm_apic_match_dest(vcpu, NULL, 0,	e->fields.dest_id,
> -				e->fields.dest_mode))
> +	if (!kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
> +				 e->fields.dest_id,
> +				 kvm_lapic_irq_dest_mode(e->fields.dest_mode)))
>  		return;
>  
>  	new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
> @@ -237,6 +238,7 @@ void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, ulong *ioapic_handled_vectors)
>  	struct dest_map *dest_map = &ioapic->rtc_status.dest_map;
>  	union kvm_ioapic_redirect_entry *e;
>  	int index;
> +	u16 dm;
>  
>  	spin_lock(&ioapic->lock);
>  
> @@ -250,8 +252,9 @@ void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, ulong *ioapic_handled_vectors)
>  		if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
>  		    kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index) ||
>  		    index == RTC_GSI) {
> -			if (kvm_apic_match_dest(vcpu, NULL, 0,
> -			             e->fields.dest_id, e->fields.dest_mode) ||
> +			dm = kvm_lapic_irq_dest_mode(e->fields.dest_mode);

Nit: you could've defined 'dm' right here in the block (after '{') but
in any case I'd suggest to stick to 'dest_mode' and not shorten it to
'dm' for consistency.

> +			if (kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
> +						e->fields.dest_id, dm) ||
>  			    kvm_apic_pending_eoi(vcpu, e->fields.vector))
>  				__set_bit(e->fields.vector,
>  					  ioapic_handled_vectors);
> diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
> index 5f59e5ebdbed..e89c2160b39f 100644
> --- a/arch/x86/kvm/irq_comm.c
> +++ b/arch/x86/kvm/irq_comm.c
> @@ -417,7 +417,8 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
>  
>  			kvm_set_msi_irq(vcpu->kvm, entry, &irq);
>  
> -			if (irq.level && kvm_apic_match_dest(vcpu, NULL, 0,
> +			if (irq.level &&
> +			    kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
>  						irq.dest_id, irq.dest_mode))
>  				__set_bit(irq.vector, ioapic_handled_vectors);
>  		}

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly