Re: [Xen-devel] [PATCH V3] tools/libxc, xen/x86: Added xc_set_mem_access_multi()

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Razvan Cojocaru writes ("[PATCH V3] tools/libxc, xen/x86: Added 
xc_set_mem_access_multi()"):
> Currently it is only possible to set mem_access restrictions only for
> a contiguous range of GFNs (or, as a particular case, for a single GFN).
> This patch introduces a new libxc function taking an array of GFNs.
> The alternative would be to set each page in turn, using a userspace-HV
> roundtrip for each call, and triggering a TLB flush per page set.
> 
> Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

I have no objection with my tools maintainer hat on.  But I have a
question for you and/or the hypervisor maintainers:

Could this aim be achieved with a multicall ?  (Can multicalls defer
the TLB flush?)

Ian.

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