Hi Sathya,
To your question, no. Most of memory region reserved as
EfiRuntimeServicesData will NOT be reported in RMRR table.
VT-d spec:
" BIOS allocated reserved memory ranges that may be DMA
targets. BIOS may report each such reserved memory region through the RMRR
structures, along
with the devices that requires access to the specified reserved memory
region. Reserved memory
ranges that are either not DMA targets, or memory ranges that may be target
of BIOS initiated DMA
only during pre-boot phase (such as from a boot disk drive) *must not be
included* in the reserved
memory region reporting."
Thanks,
Tao
On Tue, May 14, 2013 at 9:16 AM, Prakash, Sathya <[email protected]>wrote:
> Folks,
> We allocate some host memory as EfiRuntimeServicesData and utilize the
> memory in host driver for a certain purpose. This works fine with normal
> cases, but will it work with IOMMU?. I see the IOMMU module in linux needs
> to know about the reserved regions through RMRR address table to map the
> access, does the GetMemoryMap supports this?
>
> Thanks
> Sathya
>
>
>
>
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