On Fri, Apr 20, 2018 at 12:47:52PM -0400, Sinan Kaya wrote:
> On 4/20/2018 2:55 AM, Greg KH wrote:
> > On Thu, Apr 19, 2018 at 01:07:29PM -0400, Sinan Kaya 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.
>
> It looks like the commit 523184972b28 ("vfio/pci: Virtualize Maximum Payload Size")
> is already applied for 4.9.94.
>
> Go ahead and apply commit cf0d53ba4947 ("vfio/pci: Virtualize Maximum Read Request
> Size") for 4.9.y.
Yes, added that to the 4.14.y and 4.9.y trees (you can't forget
4.14.y...)
thanks,
greg k-h