On 2017-08-05 02:59, Pontes, Otavio wrote:
> Hi,
> 
> I am using jailhouse in an Intel x86 hardware and I am having some
> problems to start ivshmem-net driver in a root cell, in order to
> communicate with a Linux inmate cell.
> I have successfully use this driver to stablish a communication between
> two Linux inmate cells, but the driver fails when I load it in the root
> cell.
> Can anyone help me in understanding this issue and debbuging the
> problem?
> 
> In the root cell configuration file I have addeded the following:
> 
> mem_regions:
>     /* IVSHMEM shared memory region (networking) */
>     {
>         .phys_start = 0x3f100000,
>         .virt_start = 0x3f100000,
>         .size = 0xff000,
>         .flags = JAILHOUSE_MEM_READ | JAILHOUSE_MEM_WRITE |
>             JAILHOUSE_MEM_ROOTSHARED,
>     },
> 
> pci_devices:
>     /* IVSHMEM (networking) */
>     {
>         .type = JAILHOUSE_PCI_TYPE_IVSHMEM,
>         .domain = 0x0000,
>         .bdf = 0x0f << 3, //This doesn't conflict with other bdf
>         .bar_mask = {
>             0xffffff00, 0xffffffff, 0x00000000,
>             0x00000000, 0xffffffe0, 0xffffffff,
>         },
>         .num_msix_vectors = 1,
>         .shmem_region = 0, //This is pointing to the mem_region above
>         .shmem_protocol = JAILHOUSE_SHMEM_PROTO_VETH,
>     },
> 
> And when I run:
>  $ ./tools/jailhouse enable configs/root.cell
> 
> The driver ivshmem-net is loaded and the following message is printed
> in the kernel log
> [   20.956367] ivshmem-net 0000:00:0f.0: invalid IVPosition -1
> 
> I noticed when I was debbuging this issue that the function
> ivshmem_register_mmio is not called when ivshmem-net driver tries to
> get the ivpos value. I suspected then that value of bar0_address and
> bar4_address may be wrong. Is there an way to know what would be the
> expected value for this addresses? Or is there any other thing I should
> check to try to debug this?

If that function isn't called, the guest may not have enabled the
virtual PCI device properly (trapped by ivshmem_write_command), or the
address it programmed into that BARs is not trapped by the Jailhouse
configuration for that cell - IOW, the config maps it to something real.

Jan

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