[Xen-devel] IOREQ server on Arm

[Julien Grall <julien.grall@xxxxxxx>]

Hi Paul,

I am looking at porting the IOREQ server infrastructure on Arm. I didn't 
need much modification to make it run for Arm. Although, the 
implementation could be simplified over the x86 implementation.
I noticed some issue while trying to implement the hypercall 
XENMEM_acquire_resource. Per my understanding, all the page mapped via 
that hypercall will use the type p2m_mapping_foreign.
This will result to trigger the ASSERT(fdom != dom) in get_page_from_gfn 
(asm-arm/p2m.h) because the IOREQ page has been allocated to the 
emulator domain and mapped to it. AFAICT x86 has the same assert in 
p2m_get_page_from_gfn(...).
IHMO, the ASSERT makes sense because you are only meant to map page 
belonging to other domain with that type.
So I am wondering whether IOREQ server running in PVH Dom0 has been 
tested? What would be the best course of action to fix the issue?
Cheers,

--
Julien Grall

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