Hi,
My name is Pratik Pranav, a second-year undergraduate student, majoring in Computer Science at Indian Institute of Technology(IIT), Delhi. I am currently working on building a messaging layer between two VMs(x86 and ARM) using ivshmem and currently deploying on QEMU.
I am facing a problem while registering an interrupt in doorbell registers. Whenever I am registering an interrupt on doorbell-registers, I can see the interrupt handler run when the interrupt is registered from ARM to x86, but not from x86 to ARM. Although I think interrupts are reaching the ARM VM concluded from the following output obtained by changing IVSHMEM_DEBUG to 1 in ivshmem.c.
-------------------------------------------------------------
IVSHMEM: interrupt on vector 0x56430d1ce940 3
IVSHMEM: interrupt on vector 0x56430d1ce940 2
IVSHMEM: interrupt on vector 0x56430d1ce940 1
IVSHMEM: interrupt on vector 0x56430d1ce940 0
-------------------------------------------------------------
I have tried interrupting using ivshmem-client(other than using doorbell), but the problem remains the same.
All the interrupt lines are visible in /proc/interrupts in both the VMs with MSIX enabled.
The command prompts I am using currently are:
x86: sudo qemu/x86_64-softmmu/qemu-system-x86_64 --enable-kvm -m 2048 -smp 4 -chardev socket,path=/tmp/ivshmem_socket,id=foo -device ivshmem-doorbell,chardev=foo,vectors=4 -hda x86.img -netdev tap,id=x86nic,ifname=tap0 -device e1000,netdev=x86nic,mac=52:54:00:12:34:60 -nographic
arm: sudo qemu/aarch64-softmmu/qemu-system-aarch64 -cpu cortex-a57 -smp 2 -chardev socket,path=/tmp/ivshmem_socket,id=foo -device ivshmem-doorbell,chardev=foo,vectors=4 -m 2048 -M virt -bios qemu_efi.fd -drive if=none,file=arm.img,id=hd0 -device virtio-blk-device,drive=hd0 -netdev tap,id=armnic,ifname=tap1 -device e1000,netdev=armnic,mac=52:54:00:12:34:63 -nographic
Could you guys suggest anything?
I will be highly thankful to you.
Thank you for your consideration.
Keenly awaiting your reply,
Yours Sincerely,
Pratik Pranav
Second-Year Undergraduate
Computer Science and Technology
Indian Institute of Technology(IIT), Delhi
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