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Re: Segment truncation in multi-segment PCI handling?
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 7 Jun 2024 20:52:33 +0100
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- Delivery-date: Fri, 07 Jun 2024 19:52:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07/06/2024 8:46 pm, Marek Marczykowski-Górecki wrote:
> Hi,
>
> I've got a new system, and it has two PCI segments:
>
> 0000:00:00.0 Host bridge: Intel Corporation Device 7d14 (rev 04)
> 0000:00:02.0 VGA compatible controller: Intel Corporation Meteor Lake-P
> [Intel Graphics] (rev 08)
> ...
> 10000:e0:06.0 System peripheral: Intel Corporation RST VMD Managed
> Controller
> 10000:e0:06.2 PCI bridge: Intel Corporation Device 7ecb (rev 10)
> 10000:e1:00.0 Non-Volatile memory controller: Phison Electronics
> Corporation PS5021-E21 PCIe4 NVMe Controller (DRAM-less) (rev 01)
>
> But looks like Xen doesn't handle it correctly:
>
> (XEN) 0000:e0:06.0: unknown type 0
> (XEN) 0000:e0:06.2: unknown type 0
> (XEN) 0000:e1:00.0: unknown type 0
> ...
> (XEN) ==== PCI devices ====
> (XEN) ==== segment 0000 ====
> (XEN) 0000:e1:00.0 - NULL - node -1
> (XEN) 0000:e0:06.2 - NULL - node -1
> (XEN) 0000:e0:06.0 - NULL - node -1
> (XEN) 0000:2b:00.0 - d0 - node -1 - MSIs < 161 >
> (XEN) 0000:00:1f.6 - d0 - node -1 - MSIs < 148 >
> ...
>
> This isn't exactly surprising, since pci_sbdf_t.seg is uint16_t, so
> 0x10000 doesn't fit. OSDev wiki says PCI Express can have 65536 PCI
> Segment Groups, each with 256 bus segments.
>
> Fortunately, I don't need this to work, if I disable VMD in the
> firmware, I get a single segment and everything works fine.
>
This is a known issue. Works is being done, albeit slowly.
0x10000 is indeed not a spec-compliant PCI segment. It's something
model specific the Linux VMD driver is doing.
~Andrew
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