From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [v5][PATCH 3/5] xen,
 gfx passthrough: support Intel IGD passthrough with VT-D
Date: Wed, 25 Jun 2014 08:25:44 +0200
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References: <1403662641-28526-1-git-send-email-tiejun.chen@intel.com>
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To: Tiejun Chen <tiejun.chen@intel.com>, anthony.perard@citrix.com, stefano.stabellini@eu.citrix.com, mst@redhat.com, Kelly.Zytaruk@amd.com
Cc: peter.maydell@linaro.org, xen-devel@lists.xensource.com, allen.m.kay@intel.com, qemu-devel@nongnu.org, anthony@codemonkey.ws, yang.z.zhang@intel.com
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Il 25/06/2014 04:17, Tiejun Chen ha scritto:
> +int pci_create_pch(PCIBus *bus)
> +{
> +    XenHostPCIDevice hdev;
> +    int r = 0;
> +
> +    if (!xen_has_gfx_passthru) {
> +        return r;
> +    }
> +

You could make this an assertion, since the function is never called 
with xen_has_gfx_passthru == 0.  Or just drop the check completely, so 
the function can be moved in patch 2.

Paolo