On 12/29/2013 08:16 PM, Alex Williamson wrote:
On Sat, 2013-12-28 at 23:32 -0800, Dana Goyette wrote:
On 12/28/2013 7:23 PM, Alex Williamson wrote:
On Sat, 2013-12-28 at 18:31 -0800, Dana Goyette wrote:
I have purchased both a SuperMicro X10SAE and an X10SAT, and I need to
soon decide which one to keep.
The SuperMicro X10SAT has all the PCIe x1 slots hidden behind a PLX
PEX8066 switch, which claims to support ACS. I'd expect the devices
downstream of the PLX switch to be in separate groups.
With Linux 3.13-rc5 and "enable overrides for missing ACS capabilities"
applied and set for the Intel root ports, the devices behind the switch
remain stuck in the same group.
In terms of passing devices to different VMs, which is better: all
devices on different root ports, or all devices behind the one
ACS-supporting switch?
Can you provide lspci -vvv info? If you're getting that for groups
either the switch has ACS capabilities, but doesn't support the features
we need or we're doing something wrong. Thanks,
I initially tried attaching the output as a .txt file, but it's too
large. Anyway, here's the output of lspci -nnvvv (you may notice that I
moved the Radeon to a different slot).
Well, something seems amiss since the downstream switch ports all seem
to support and enable the correct set of ACS capabilities. I'm tending
to suspect something wrong with the ACS override patch or how it's being
used since your IOMMU group is still based at the root port. Each root
port is isolated from the other root ports though, so something is
happening with the override patch. Can you provide the kernel command
line you use to enable ACS overrides and the override patch you're
using, as it applies to 3.13-rc5? Thanks,
Alex
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I'm using the original acs-override patch from this post:
https://lkml.org/lkml/2013/5/30/513
Kernel parameter is:
pcie_acs_override=id:8086:8c10,id:8086:8c12,id:8086:8c16,id:8086:8c18
When booting a kernel without the override patch, the following devices
are all in the same group: Intel Root Ports 1, 2, 4, 5; ASMedia SATA
controller; PLX PEX8606 switch; Renesas USB controller; TI Firewire
controller; Intel I210 Ethernet controller.
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