[vbox-dev] Chipset support for Message Signaled Interrupts (MSI)

[Ananth Pallapothu]

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.

I am assuming you invoked PDM*irq function with your device appropriately
(upon receiving the interrupt) ?

On Thu, Mar 24, 2016 at 7:11 PM, Vilbig, Ric <ric_vilbig at mentor.com> wrote:

> Now I have the opposite question.  Are IRQ type interrupts (as in PCI
> Config 0x3d IntPin) expected to work with ICH9?
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> 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".
>
>
>
> Thanks,
>
>
>
> //  RicV
>
>
>
>
>
> *From:* Ananth Pallapothu [mailto:apallapothu at gmail.com]
> *Sent:* Monday, March 21, 2016 15:55
> *To:* Vilbig, Ric
> *Cc:* VirtualBox developer's list
> *Subject:* Re: [vbox-dev] Chipset support for Message Signaled Interrupts
> (MSI)
>
>
>
> 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_vilbig at 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_vilbig at mentor.com
>
>
>
>
>
>
> _______________________________________________
> vbox-dev mailing list
> vbox-dev at virtualbox.org
> https://www.virtualbox.org/mailman/listinfo/vbox-dev
>
> _______________________________________________
> vbox-dev mailing list
> vbox-dev at virtualbox.org
> https://www.virtualbox.org/mailman/listinfo/vbox-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.virtualbox.org/pipermail/vbox-dev/attachments/20160326/739f7703/attachment.html>