On Thu, 19 Apr 2018 13:07:29 -0400
Sinan Kaya <okaya@xxxxxxxxxxxxxx> wrote:
> Hi Greg,
>
> Upstream commit cf0d53ba4947 ("vfio/pci: Virtualize Maximum Read Request
> Size") and commit 523184972b28 ("vfio/pci: Virtualize Maximum Payload Size")
> fixes nasty PCIe virtualization issues for platforms that support Maximum
> Payload Size bigger than 128.
>
> Issue shows up when a device is assigned to the guest machine as a passthrough.
> Guest machine configures the MPS/MRRS settings to values that are incompatible
> with the parent bridge device.
>
> This causes PCIe transaction timeouts and AER errors to be spilled in the host
> kernel.
>
> Please apply commit cf0d53ba4947 and 523184972b28 to all affected releases to
> fix the resulting regression.
Acked-by: Alex Williamson <alex.williamson@xxxxxxxxxx>