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Adding MSI support for virtio-pci to QEMU as Xen backend on ARM
- To: "qemu-devel@xxxxxxxxxx" <qemu-devel@xxxxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Fri, 8 Dec 2023 09:59:49 +0000
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- Cc: David Woodhouse <dwmw@xxxxxxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Vikram Garhwal <vikram.garhwal@xxxxxxx>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>
- Delivery-date: Fri, 08 Dec 2023 10:00:08 +0000
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- Thread-topic: Adding MSI support for virtio-pci to QEMU as Xen backend on ARM
Hello everyone,
I am currently working on adding MSI support to virtio-pci on ARM with Xen.
As far as I understand QEMU Xen ARM machine that is used for virtio-pci device
emulation does not initialize any interrupt controllers. And that makes it
somewhat unclear what is the best approach to adding the MSI support. So, I
would appreciate some thoughts on this.
To trigger the MSI interrupt in Xen guests we basically need to call a single
DMOP, which I am also implementing.
So far, I have come up with 3 possible approaches:
1. Hooking up the existing GIC code to the Xen Arm machine and extending it
with the DMOP call.
2. Writing some new barebones GIC implementation with only the required methods
(something similar to xen_apic.c).
3. Just hooking up the DMOP call to the existing PCI code based on
xen_enabled() check.
Maybe there is something else that is better that I have missed.
Best regards
Mykyta
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