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From: | Laine Stump |
Subject: | Re: [Qemu-devel] [PATCH RFC] docs: add PCIe devices placement guidelines |
Date: | Tue, 4 Oct 2016 13:54:26 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 |
On 10/04/2016 12:10 PM, Laine Stump wrote:
On 10/04/2016 11:40 AM, Laszlo Ersek wrote:
Small correction to your wording though: you don't want to attach the DMI-PCI bridge to the PXB device, but to the extra root bus provided by the PXB.This made me realize something - the root bus on a pxb-pcie controller has a single slot and that slot can accept either a pcie-root-port (ioh3420) or a dmi-to-pci-bridge. If you want to have both express and legacy PCI devices on the same NUMA node, then you would either need to create one pxb-pcie for the pcie-root-port and another for the dmi-to-pci-bridge, or you would need to put the pcie-root-port and dmi-to-pci-bridge onto different functions of the single slot. Should the latter work properly?
We were discussing pxb-pcie today while Dan was trying to get a particular configuration working, and there was some disagreement about two points that I stated above as fact (but which may just be misunderstanding again):
1) Does pxb-pcie only provide a single slot (0)? Or does it provide 32 slots (0-31) just like the pcie root complex?
2) can you really only plug a pcie-root-port (ioh3420) into a pxb-pcie? Or will it accept anything that pcie.0 accepts?
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