Problem about IO memory map

[Milon-yang]

Hi,

I am trying to create a memory region for "interrupt-controller" register in L4RE, using the below blocks:
reg = <0x0 0x06000000 0 0x10000>, // GIC Dist
<0x0 0x06200000 0 0x200000>, // GICR (RD_base + SGI_base)
<0x0 0x0c0c0000 0 0x2000>, // GICC
<0x0 0x0c0d0000 0 0x1000>, // GICH
<0x0 0x0c0e0000 0 0x20000>; // GICV

I also add memory map information in io.cfg as below:
gic = Hw.Device(function()
compatible = "arm,gic-v3", "arm,gic-400", "arm,cortex-a15-gic", "arm,cortex-a9-gic";
Property.hid = "fsl,gic";
Resource.reg0 = Res.mmio(0x6000000, 0x6000000 + 0x10000 - 1);
Resource.reg1 = Res.mmio(0x6200000, 0x6200000 + 0x200000 - 1);
Resource.reg2 = Res.mmio(0xc0c0000, 0xc0c0000 + 0x2000 - 1);
Resource.reg3 = Res.mmio(0xc0d0000, 0xc0d0000 + 0x1000 - 1);
Resource.reg4 = Res.mmio(0x6020000, 0x6020000 + 0x20000 - 1);
Resource.reg5 = Res.mmio(0xc0e0000, 0xc0e0000 + 0x20000 - 1);
Resource.irq0 = Res.irq(32 + 9, Io.Resource.Irq_type_level_high);
end)

But when L4RE boot, it will report the error:
VMM: FATAL: Unmergable mmio regions: [6200000:63fffff] (N12_GLOBAL__N_17Dist_v36RedistE) <-> [6200000:63fffff] (mmio
ds: [200000 - ?] -> [16000:6200000 - ?])
vm1 | terminate called after throwing an instance of 'N2L413Runtime_errorE'
vm1 | what: Invalid argument: Unmergable mmio regions

Please help to check the error reason, Thanks a lot.

[alacko]

Hi. For a VM the interrupt controller is handled by the virtualization layer and uvmm, i.e. there is no need to configure something in io for this. It is not passed through. I believe the error is coming the configuration that the regions are also available via io. My guess would be it disappears when the regions are removed from the io configuration.

[Milon-yang]

Hi, I remove the regions from the io configuration, the error disappeared, thanks.
But I need to use these regions for network, for example, my dts has "fsl-mc@80c000000" as below:

The “fsl-mc” node need a sub node " msi-parent = <&its>", while the "its"node is defind in "gic: interrupt-controller@6000000" as below:

The problem is when I use this dts to build and boot L4RE, it will report the error "gic-its@6020000: unable to locate ITS domain", you could refer to the log in attachment for more detail.

log.zip

[alacko]

Hi, thanks for describing your use-case. The network device needs MSI support which is not yet supported, however we're doing something about it. Stay tuned or talk to me directly. Thanks Adam

[Milon-yang]

OK, thanks Adam.