Re: [Xen-devel] [PATCH v2] AMD/IO-APIC: Use old IO-APIC ack method if AMD 813{1, 2} PCI-X tunnel is present

[George Dunlap <dunlapg@xxxxxxxxx>]

On Tue, Jun 4, 2013 at 11:13 AM, Andrew Cooper
<andrew.cooper3@xxxxxxxxxx> wrote:
> References at time of patch:
>
> AMD 8132 PCI-X HyperTransport Tunnel
> http://support.amd.com/us/ChipsetMotherboard_TechDocs/30801.pdf
>
> AMD 8131 PCI-X HyperTransport Tunnel
> http://support.amd.com/us/ChipsetMotherboard_TechDocs/26310_AMD-8131_HyperTransport_PCI-X_Tunnel_Revision_Guide_rev_3_18.pdf
>
> The IO-APICs on the above two PCI-X HyperTransport Tunnels will issue illegal
> HT packets if an interrupt gets masked while active.
>
> This is sadly exactly what the "new" IO-APIC ack mode does.  The "old" ack
> mode does however avoid this bad behaviour, and stabilises an affected system
> belonging to a customer.
>
> Original patch:
> Signed-off-by: Malcolm Crossley <malcolm.crossley@xxxxxxxxxx>
>
> Forward ported and tweaked for upstream:
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Re the release:

Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

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