linux-kernel - Re: [PATCH 2/7] KVM: kvm_host: add kvm_extended

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Message-ID: <55956EDE.6030300@arm.com>
Date:	Thu, 2 Jul 2015 18:03:26 +0100
From:	Andre Przywara <andre.przywara@....com>
To:	Eric Auger <eric.auger@...aro.org>,
	"eric.auger@...com" <eric.auger@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"p.fedin@...sung.com" <p.fedin@...sung.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH 2/7] KVM: kvm_host: add kvm_extended_msi

Hi Eric,

just played a bit with the code and I could make things easier by the
following change:

On 29/06/15 16:37, Eric Auger wrote:
> Add a new kvm_extended_msi struct to store the additional device ID
> specific to ARM. kvm_kernel_irq_routing_entry union now encompasses
> this new struct.
> 
> Signed-off-by: Eric Auger <eric.auger@...aro.org>
> 
> ---
> 
> RFC -> PATCH:
> - reword the commit message after change in first patch (uapi)
> ---
>  include/linux/kvm_host.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index ad45054..e1c1c0d 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -304,6 +304,13 @@ struct kvm_s390_adapter_int {
>  	u32 adapter_id;
>  };
>  
> +struct kvm_extended_msi {
> +	u32     address_lo;     /* low 32 bits of msi message address */
> +	u32     address_hi;     /* high 32 bits of msi message address */
> +	u32     data;           /* 16 bits of msi message data */
> +	u32	devid;		/* out-of-band device ID */
> +};
> +

I got rid of this structure at all, instead using:

 @@ -317,6 +324,7 @@ struct kvm_kernel_irq_routing_entry {
  		} irqchip;
-		struct msi_msg msi;
+		struct {
+			struct msi_msg msi;
+			u32 devid;
+		};
  		struct kvm_s390_adapter_int adapter;
  	};
  	struct hlist_node link;
  };

This re-uses the existing MSI fields in struct msi_msg, so all the extra
code you added in the next patches to set address and data could be
skipped. If needed we can add a flags field here as well to avoid that
extra type.
That simplified a lot for me.

Cheers,
André
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