linux-kernel - Re: [PATCH 1/3] KVM: Expose get_eoi_gsi for IRQ acking for assigned devices.

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Message-ID: <48591AD9.9050903@qumranet.com>
Date:	Wed, 18 Jun 2008 07:25:29 -0700
From:	Avi Kivity <avi@...ranet.com>
To:	Amit Shah <amit.shah@...ranet.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, muli@...ibm.com,
	benami@...ibm.com, allen.m.kay@...el.com, chrisw@...hat.com
Subject: Re: [PATCH 1/3] KVM: Expose get_eoi_gsi for IRQ acking for assigned
 devices.

Amit Shah wrote:
> Also add kvm_ prefix.
>
> Signed-off-by: Amit Shah <amit.shah@...ranet.com>
> ---
>  virt/kvm/ioapic.c |    4 ++--
>  virt/kvm/ioapic.h |    1 +
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
> index 99a1736..4c41a00 100644
> --- a/virt/kvm/ioapic.c
> +++ b/virt/kvm/ioapic.c
> @@ -284,7 +284,7 @@ void kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
>  	}
>  }
>  
> -static int get_eoi_gsi(struct kvm_ioapic *ioapic, int vector)
> +int kvm_get_eoi_gsi(struct kvm_ioapic *ioapic, int vector)
>  {
>  	int i;
>  
> @@ -300,7 +300,7 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
>  	union ioapic_redir_entry *ent;
>  	int gsi;
>  
> -	gsi = get_eoi_gsi(ioapic, vector);
> +	gsi = kvm_get_eoi_gsi(ioapic, vector);
>  	if (gsi == -1) {
>  		printk(KERN_WARNING "Can't find redir item for %d EOI\n",
>  		       vector);
>
>   

de53f0e48a1ec9880613a9bdbc5d1d3dcfada0f7 kills get_eoi_gsi, since there 
can be more than one irq mapped to a vector.  I guess the right way to 
deal with this is to install a callback in the pic and apic, to be 
called when the guest acks the interrupt.


-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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