Re: [Xen-devel] Design doc of adding ACPI support for arm64 on Xen - version 2

[Christoffer Dall <christoffer.dall@xxxxxxxxxx>]

On Fri, Aug 7, 2015 at 12:33 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Shannon,
>
> Just some clarification questions.
>
> On 07/08/15 03:11, Shannon Zhao wrote:
>> 3. Dom0 gets grant table and event channel irq information
>> -----------------------------------------------------------
>> As said above, we assign the hypervisor_id be "XenVMM" to tell Dom0 that
>> it runs on Xen hypervisor.
>>
>> For grant table, add two new HVM_PARAMs: HVM_PARAM_GNTTAB_START_ADDRESS
>> and HVM_PARAM_GNTTAB_SIZE.
>>
>> For event channel irq, reuse HVM_PARAM_CALLBACK_IRQ and add a new
>> delivery type:
>> val[63:56] == 3: val[15:8] is flag: val[7:0] is a PPI (ARM and ARM64
>> only)
>
> Can you describe the content of flag?
>
>> When constructing Dom0 in Xen, save these values. Then Dom0 could get
>> them through hypercall HVMOP_get_param.
>>
>> 4. Map MMIO regions
>> -------------------
>> Register a bus_notifier for platform and amba bus in Linux. Add a new
>> XENMAPSPACE "XENMAPSPACE_dev_mmio". Within the register, check if the
>> device is newly added, then call hypercall XENMEM_add_to_physmap to map
>> the mmio regions.
>>
>> 5. Route device interrupts to Dom0
>> ----------------------------------
>> Route all the SPI interrupts to Dom0 before Dom0 booting.
>
> Not all the SPI will be routed to DOM0. Some are used by Xen and should
> never be used by any guest. I have in mind the UART and SMMU interrupts.
>
> You will have to find away to skip them nicely. Note that not all the
> IRQs used by Xen are properly registered when we build DOM0 (see the SMMU).
>
Just to clarify; Xen should map all SPIs which are not reserved for
Xen to Dom0, right?

-Christoffer

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