[Bug 203874] [patch] MSI/MSI-X interrupts don't work in VMware virtual machines

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203874

Mahmoud Al-Qudsi <mqudsi at neosmart.net> changed:

           What    |Removed                     |Added
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                 CC|                            |mqudsi at neosmart.net

--- Comment #28 from Mahmoud Al-Qudsi <mqudsi at neosmart.net> ---
Hopefully this isn't too late but I know there were some issues caused with
pass-through PCI-e devices and MSI-X support under ESX 5.5+, but I cannot for
the life of me find the issue that I know exists somewhere in bugzilla (either
this one or on the FreeNAS one).

This is not the issue I was searching for (which is one that I've commented
on), but here is a report that was originally filed against a FreeBSD system
running under ESX 5.1 (not pre-5.0 as claimed in some of the comments above):
https://redmine.ixsystems.com/issues/2056

This must have been before the hack was added to pci.c because the fix back
then was to globally set hw.pci.enable_msix=0 (or else individually blacklist
the LSI device).

I personally ran into interrupt storms with MSI-X enabled under 6.0 and a LSI
9211-8i a few years back, which is how I first came across this back in the
day. Googling for some variation of `esxi, freebsd, mps, interrupt storm, lsi,
pass-through, vmware` brings up a lot of relevant results, almost all of which
are post ESX 5.0

I am reminded heavily of Chesterton's fence here and would recommend proceeding
only with extreme caution (and after looking into LSI HBA passthrough
configurations and scenarios).

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