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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>
 <d0a558e2-721f-517c-4d48-37fb933550f9@oracle.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
Message-ID: <a4694bd2-2f8d-6867-dc4a-b89c3e05ed75@oracle.com>
Date:   Wed, 8 Nov 2017 16:22:26 -0500
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On 11/06/2017 03:46 PM, Boris Ostrovsky wrote:
> 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>


Applied to for-linus-4.15.

-boris

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