<div dir="ltr">You could check MSI enablement by running down config space of the device. Check the capabilities pointer and track down MSI capability.<div><br></div><div>I am assuming you have added MSI registration code in your device model matching the end point device.</div><div>Past that, you simply need to look out for any upstream memory writes @ address 0xFEEXXXXX, upon receiving, simply invoke <span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px">PDMDevHlpPCISetIrq(). As long as the model is MSI enabled code will pick appropriate MSI related functions. </span></div><div><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px"><br></span></div><div><span style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px">I am not sure I can comment more on Legacy without actually knowing, debugging through the code.</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 30, 2016 at 6:33 PM, Vilbig, Ric <span dir="ltr"><<a href="mailto:ric_vilbig@mentor.com" target="_blank">ric_vilbig@mentor.com</a>></span> wrote:<br><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="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I am not sure if the drivers are MSI enabled, or how to check that — I just installed the guest from standard iso distribution. But I should think when the
driver is bound to a new device, it would check the capabilities of that device. This particular device (USB mass storage controller) does not support MSI.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Yes, I am calling PDMDevHlpPCISetIrq() to signal the interrupt. This same virtual device model works well in a VM that uses the PIIX3 chipset, but I need to
move to the ICH9 chipset to support a different device (PCIe switch) which does require MSI support. That is actually my goal right now, I just thought moving the older device that already works with PIIX3 over to ICH9 would be a good first step in that transition.
In the end I need both of these devices working in the same VM.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">// RicV<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Ananth Pallapothu [mailto:<a href="mailto:apallapothu@gmail.com" target="_blank">apallapothu@gmail.com</a>]
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<b>Sent:</b> Saturday, March 26, 2016 11:00<br>
<b>To:</b> Vilbig, Ric<br>
<b>Cc:</b> <a href="mailto:vbox-dev@virtualbox.org" target="_blank">vbox-dev@virtualbox.org</a></span></p><div><div class="h5"><br>
<b>Subject:</b> Re: [vbox-dev] Chipset support for Message Signaled Interrupts (MSI)<u></u><u></u></div></div><p></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Are you sure your drivers aren't MSI enabled ? Not any known issues with Legacy on ICH9 or I should rather say I didn't have any issue using Legacy interrupts.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">I am assuming you invoked PDM*irq function with your device appropriately (upon receiving the interrupt) ?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Mar 24, 2016 at 7:11 PM, Vilbig, Ric <<a href="mailto:ric_vilbig@mentor.com" target="_blank">ric_vilbig@mentor.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Now I have the opposite question. Are IRQ type interrupts (as in PCI Config 0x3d IntPin) expected
to work with ICH9?</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I have a virtual PCI device which works with PIIX3 quite nicely using IRQ4 — a USB3 mass storage
device. But when plugged into the ICH9 VM the device is not detected within the guest, using IRQ1/2/3/4.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The guest must know the device is present, because it does lots of MMIO Rd/Wr to it, and then the
device does some DMA, and raises an interrupt. Everything looks quite similar between the ICH9 and PIIX3 case, except the former does nothing more after raising the interrupt, whereas the latter continues working with lots more DMA, interrupts, and a usable
mass storage device in the guest.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">From what I have found so far, the interrupt is passed down into PDM, but does not actually do anything,
and dmesg in the guest says "can't derive routing for PCI INT n".</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">// RicV</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Ananth Pallapothu [mailto:<a href="mailto:apallapothu@gmail.com" target="_blank">apallapothu@gmail.com</a>]
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<b>Sent:</b> Monday, March 21, 2016 15:55<br>
<b>To:</b> Vilbig, Ric<br>
<b>Cc:</b> VirtualBox developer's list<br>
<b>Subject:</b> Re: [vbox-dev] Chipset support for Message Signaled Interrupts (MSI)</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
<p>MSI's came into existence after PIIX3.<u></u><u></u></p>
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<p>Yes, if you need MSI you need to use ICH9.<br>
PIIX3 doesn't support MSI<u></u><u></u></p>
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<p class="MsoNormal">On Mar 21, 2016 6:43 PM, "Vilbig, Ric" <<a href="mailto:ric_vilbig@mentor.com" target="_blank">ric_vilbig@mentor.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="color:#002060">Hi Experts,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#002060"> </span><u></u><u></u></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.</span><u></u><u></u></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></span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#002060"> </span><u></u><u></u></p>
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<span style="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).</span><u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<span style="color:#002060"> </span><u></u><u></u></p>
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<span style="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).</span><u></u><u></u></p>
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<span style="color:#002060"> </span><u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<span style="color:#002060">“...VirtualBox 4.0 introduced an emulation of the more modern ICH9 chipset, which supports PCI express,</span><u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<span style="color:#002060">three PCI buses, PCI-to-PCI bridges and Message Signaled Interrupts (MSI)...”</span><u></u><u></u></p>
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<span style="color:#002060"> </span><u></u><u></u></p>
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<b><span style="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?</span></b><u></u><u></u></p>
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<span style="color:#002060"> </span><u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<span style="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.</span><u></u><u></u></p>
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<span style="color:#002060"> </span><u></u><u></u></p>
<p class="MsoNormal" style="margin-left:.5in">
<span style="color:#002060">“Note that the ICH9 support is experimental and not recommended for guest operating systems which do not require it.”</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="color:#002060"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#002060">Thanks in advance for your help.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#002060"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#002060">_____________________________________________</span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#002060"> </span></b><u></u><u></u></p>
<p class="MsoNormal"><b><span style="color:#002060">Ric Vilbig</span></b><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">Mentor Graphics, Emulation Division</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">46871 Bayside Parkway, Fremont CA, 94538</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">Phone:
<a href="tel:510-354-7360" target="_blank">510-354-7360</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">Mobile:
<a href="tel:408-529-2365" target="_blank">408-529-2365</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060">email:
<a href="mailto:ric_vilbig@mentor.com" target="_blank">ric_vilbig@mentor.com</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#002060"> </span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
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