MSI's came into existence after PIIX3. Yes, if you need MSI you need to use ICH9. PIIX3 doesn't support MSI On Mar 21, 2016 6:43 PM, "Vilbig, Ric" <ric_vil...@mentor.com> wrote:
> Hi Experts, > > > > I posted the following on the VIrtualBox forum, but Perry recommended I > contact you by the email list. > > https://forums.virtualbox.org/viewtopic.php?f=10&t=76867 > > > ------------------------------ > > I am working on a custom PCI device model, plugged into VirtualBox via > PDM. It's mostly working, lspci for example shows it's present. But I am > having a problem with Message Signaled Interrupts (MSI). > > > > The following quote from Ch.3 of the VirtualBox User Manual implies that > the ICP9 chipset must be used for MSI support, and I have seen supporting > evidence in web searches and VBox source code (OSE 5.0.16 tarball). > > > > “...VirtualBox 4.0 introduced an emulation of the more modern ICH9 > chipset, which supports PCI express, > > three PCI buses, PCI-to-PCI bridges and Message Signaled Interrupts > (MSI)...” > > > > *Can someone confirm or refute with certainty that the PIIX3 chipset does > not support MSI and ICH9 is required for device models using MSI?* > > > > How worried should I be about this excerpt from the same paragraph? A > quick test of ICH9 VM did not go well. I've actually tried with Fedora 23, > Fedora 18 and Ubuntu 14 guests (all 64-bit) without success, but not yet > dug into it because this quote worries me. > > > > “Note that the ICH9 support is experimental and not recommended for guest > operating systems which do not require it.” > ------------------------------ > > > > Thanks in advance for your help. > > > > _____________________________________________ > > > > *Ric Vilbig* > > Mentor Graphics, Emulation Division > > 46871 Bayside Parkway, Fremont CA, 94538 > > Phone: 510-354-7360 > > Mobile: 408-529-2365 > > email: ric_vil...@mentor.com > > > > > > _______________________________________________ > vbox-dev mailing list > vbox-dev@virtualbox.org > https://www.virtualbox.org/mailman/listinfo/vbox-dev > >
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