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Re: [Qemu-devel] [IGDVFIO] [PATCH 3/8] RFC and help completing: Intel IG
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [IGDVFIO] [PATCH 3/8] RFC and help completing: Intel IGD Direct Assignment with VFIO |
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Date: |
Wed, 24 Sep 2014 22:31:43 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
Il 24/09/2014 21:47, Alex Williamson ha scritto:
> So the opregion is mapped by a config write on the IGD device itself and
> the other 3 regions, that we know about so far, are mapped via writes to
> the host bridge.
AFAIU the opregion is mapped by the (host) BIOS, that writes the address
to a well-known scratch dword in the configuration space. The host
reads from the dword and finds the opregion that way.
Paolo