Re: [Xen-devel] [PATCH v11 0/3] xen: better grant v2 support

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 28/09/17 11:02, Juergen Gross wrote:
> Currently Linux has no support for grant v2 as this would reduce the
> maximum number of active grants by a factor of 2 compared to v1,
> because the number of possible grants are limited by the allowed number
> of grant frames and grant entries of v2 need twice as much bytes as
> those of v1.
>
> Unfortunately grant v2 is the only way to support either guests with
> more than 16TB memory size or PV guests with memory above the 16TB
> border, as grant v1 limits the frame number to be 32 bits wide.
>
> In order to remove the disadvantage of grant v2 this patch series
> adds support for setting per-domain values regarding grant limits.
> Additionally the default limit of grant frames is doubled in case
> of hosts with potential memory above the 16TB border.
>
> Changes in V11:
> - dropped patches 1-8, as already committed
> - patch 1: add comment in include/asm-arm/grant_table.h (Julien Grall)
> - patch 2: return max. subleaf number in EAX (Andrew Cooper)
> - patch 2: use flsl() instead of generic_flsl() (Jan Beulich)

Jan: You appear to have committed v10 of this series, which amongst
other things, is missing the max subleaf assignment.

Juergen: Would you mind rebasing v11 over staging, just to see what else
got missed?

~Andrew

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