<p dir="ltr">MSI's came into existence after PIIX3.</p>
<p dir="ltr"> Yes, if you need MSI you need to use ICH9.<br>
PIIX3 doesn't support MSI</p>
<div class="gmail_quote">On Mar 21, 2016 6:43 PM, "Vilbig, Ric" <<a href="mailto:ric_vilbig@mentor.com">ric_vilbig@mentor.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





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<p class="MsoNormal"><span style="color:#002060">Hi Experts,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#002060">I posted the following on the VIrtualBox forum, but Perry recommended I contact you by the email list.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#002060"><a href="https://forums.virtualbox.org/viewtopic.php?f=10&t=76867" target="_blank">https://forums.virtualbox.org/viewtopic.php?f=10&t=76867</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#002060"><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060">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).<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060">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).<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060">“...VirtualBox 4.0 introduced an emulation of the more modern ICH9 chipset, which supports PCI express,<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060">three PCI buses, PCI-to-PCI bridges and Message Signaled Interrupts (MSI)...”<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-family:"Times New Roman","serif";color:#002060">Can someone confirm or refute with certainty that the PIIX3 chipset does not support MSI and ICH9 is required for device models using MSI?<u></u><u></u></span></b></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060">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.<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman","serif";color:#002060">“Note that the ICH9 support is experimental and not recommended for guest operating systems which do not require it.”<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#002060">Thanks in advance for your help.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#002060">_____________________________________________<u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#002060"><u></u> <u></u></span></b></p>
<p class="MsoNormal"><b><span style="color:#002060">Ric Vilbig</span></b><span style="color:#002060"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">Mentor Graphics, Emulation Division</span><span style="font-size:10.0pt;color:#002060"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">46871 Bayside Parkway, Fremont CA, 94538<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">Phone:  <a href="tel:510-354-7360" value="+15103547360" target="_blank">510-354-7360</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">Mobile: <a href="tel:408-529-2365" value="+14085292365" target="_blank">408-529-2365</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">email:  <a href="mailto:ric_vilbig@mentor.com" target="_blank">
<span style="color:blue">ric_vilbig@mentor.com</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060"><u></u> <u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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