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Subject: Re: [PATCH v2 0/5] xen: grant table interface v2 support
To:     Juergen Gross <jgross@suse.com>, linux-kernel@vger.kernel.org,
        xen-devel@lists.xenproject.org
References: <20171102091921.32344-1-jgross@suse.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
Message-ID: <d0a558e2-721f-517c-4d48-37fb933550f9@oracle.com>
Date:   Mon, 6 Nov 2017 15:46:14 -0500
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On 11/02/2017 05:19 AM, Juergen Gross wrote:
> In order to support Linux to run as a pv guest on machines with huge
> memory (>16TB) or as a hvm guest with more than 16TB of memory the
> kernel has to support grant table interface v2, as v1 is limited to
> 32 bit frame numbers.
>
> This series re-adds that support (it has been removed in 2015) and
> restricts usage of v2 to the features of v1 in order to support
> migration to hosts which only support v1.
>
> V2 is selected only in the following cases:
> - the user has specified v2 via module parameter
> - in a pv guest if the maximum possible memory address of the host is
>   above 16TB (memory hotplug taken into account)
> - in a hvm guest if the maximum guest memory address is above 16TB
>   (again with memory hotplug taken into account)
>
> Changes in V2:
> - patch 2: remove update_trans_entry() from gnttab_ops (Boris Ostrovsky)
> - added new patch 4
> - patch 5: use cpuid on pv and max_possible_pfn on hvm for version select
>
> Juergen Gross (5):
>   xen: re-introduce support for grant v2 interface
>   xen: limit grant v2 interface to the v1 functionality
>   xen: add grant interface version dependent constants to gnttab_ops
>   xen: update arch/x86/include/asm/xen/cpuid.h
>   xen: select grant interface version
>
>  arch/arm/xen/grant-table.c       |   9 +-
>  arch/x86/include/asm/xen/cpuid.h |  42 +++++--
>  arch/x86/xen/grant-table.c       |  60 +++++++++-
>  drivers/xen/grant-table.c        | 244 +++++++++++++++++++++++++++++++++++----
>  include/xen/grant_table.h        |   5 +-
>  5 files changed, 318 insertions(+), 42 deletions(-)
>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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