I added .vpci_irq_base = 136-32 to the bare-metal cell config (.cell) and now I
can see the interrupts generated by uio_send through the output of cat
/proc/interrupts:
CPU0 CPU1 CPU2
38: 38 0 0 GICv2 136 Edge uio_ivshmem,
uio_ivshmem
When uio_send writes, the interrupt handler of the uio driver is called twice
per write (why??).
.vpci_irq_base = 136-32 has the same value as defined in the root-cell.
I added some prints to the
hypervisor/arch/arm-common/ivshmem.c:arch_ivshmem_trigger_interrupt and
hypervisor/arch/arm-common/irqchip.c as described in another thread
(https://www.mail-archive.com/[email protected]/msg02605.html),
but I can't see any output.
So, something is still not well configured.
The bare-metal inmate outputs the following when it starts:
IVSHMEM: Found 1af4:1110 at 00:00.0
IVSHMEM ERROR: device is not MSI-X capable
IVSHMEM: shmem is at 0x0000000800400000, shmemsz is 0x0000000000100000
IVSHMEM: bar0 is at 0x00000000fc100000
IVSHMEM: mapped shmem and bars, got position 0x0000000000000001 - bdf = 0
IVSHMEM: memcpy(0x0000000800400000, Hello from bare-metal ivshmem-demo
inmate!!! , 64)
IVSHMEM: 0x0000000800400000:Hello from bare-metal ivshmem-demo inmate!!!
IVSHMEM: Enabled IRQ:0x88
IVSHMEM: Enabling IVSHMEM_IRQs registers = 0x00000000fc100000
IVSHMEM: Done setting up...
IVSHMEM: Hello from bare-metal ivshmem-demo inmate!!!
IVSHMEM: sending interrupt.
IVSHMEM: sending IRQ - addr = 0x00000000fc10000c
IVSHMEM: waiting for interrupt.
I'm not sure about the IVSHMEM_IRQ number, that's why I inserted the prints.
Is there any other parameter that must be add to the bare-metal cell to allow
it to handle ivshmem interrupts?
Giovani
>
> Both values aren't evaluated by the current Jailhouse implementation
> (see hypervisor/ivshmem.c, ivshmem_register_mmio, IVSHMEM_REG_DBELL
> handling). There is only one vector per device (currently), and that is
> send to the SPI configured in the peer cell's config.
>
> Maybe there is a mismatch in what is configured and what the device tree
> of that cell tells the Linux guest.
>
> Jan
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