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Purpose of translate MSI interrupt into INTx for guest passthrough
- To: Qing He <qing.he@xxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 12 Jan 2021 15:10:57 +0100
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 12 Jan 2021 14:11:34 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
While trying to do some cleanup of the Xen interrupt support for pci
pass though I came across the MSI to INTx translation that Xen is in
theory capable of performing (ie: use a physical MSI interrupt source
and inject that as an INTx to a guest).
AFAICT such functionality is not wired up to the toolstack, so it's
hard to tell what's the indented purpose, or whether it has seen any
usage.
The commit that introduces it seems to be:
11f8ac5ebf passthrough: MSI-INTx translation for HVM
Which contains your SoB. Could you elaborate a bit on what was the
intended purpose, and whether this has never been used?
Thanks, Roger.
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