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Re: [Qemu-devel] question about share flatviews
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] question about share flatviews |
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Date: |
Mon, 15 Jan 2018 10:29:00 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 |
On 14/01/2018 13:20, CheneyLin wrote:
> I'm wondering why we have to shares flatviews between different ASes. In
> my opinion, arch like x86 only have two ASes(memory AS and io AS), each
> AS is related with only one flatview. Their ASes are definitely different.
Every PCI device has its own AddressSpace. A PCI device's is either the
same as the memory AS or the same as the empty AS, hence sharing the
FlatView can provide substantial memory usage improvements.
Paolo