[PATCH kernel v2 3/4] powerpc/pseries/iommu: Separate FW_FEATURE_MULTITCE to put/stuff features

[Ram Pai]

On Mon, Dec 16, 2019 at 03:19:23PM +1100, Alexey Kardashevskiy wrote:
> H_PUT_TCE_INDIRECT allows packing up to 512 TCE updates into a single
> hypercall; H_STUFF_TCE can clear lots in a single hypercall too.
> 
> However, unlike H_STUFF_TCE (which writes the same TCE to all entries),
> H_PUT_TCE_INDIRECT uses a 4K page with new TCEs. In a secure VM
> environment this means sharing a secure VM page with a hypervisor which
> we would rather avoid.
> 
> This splits the FW_FEATURE_MULTITCE feature into FW_FEATURE_PUT_TCE_IND

Can FW_FEATURE_PUT_TCE_IND be made FW_FEATURE_PUT_TCE_INDIRECT?
It conveys the meaning a bit better than FW_FEATURE_PUT_TCE_IND.

This patch is a good optimization. 

Reviewed-by: Ram Pai <linuxram at us.ibm.com>

Thanks,
RP
> -- 

snip..

> 2.17.1

-- 
Ram Pai