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Re: [Xen-devel] [PATCH v2] x86/save: reserve HVM save record numbers that have been consumed...
- To: "Durrant, Paul" <pdurrant@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 19 Dec 2019 13:08:05 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 19 Dec 2019 13:08:40 +0000
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On 19/12/2019 12:37, Durrant, Paul wrote:
>> -----Original Message-----
>> From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> Sent: 19 December 2019 12:16
>> To: Durrant, Paul <pdurrant@xxxxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
>> Cc: Wei Liu <wl@xxxxxxx>; Jan Beulich <jbeulich@xxxxxxxx>; Roger Pau Monné
>> <roger.pau@xxxxxxxxxx>
>> Subject: Re: [PATCH v2] x86/save: reserve HVM save record numbers that
>> have been consumed...
>>
>> On 19/12/2019 12:04, Paul Durrant wrote:
>>> ...for patches not (yet) upstream.
>>>
>>> This patch is simply adding a comment to reserve save record number
>> space
>>> to avoid the risk of clashes between existent downstream changes made by
>>> Amazon and future upstream changes which may be incompatible.
>>>
>>> Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
>>> Reviewed-by: Wei Liu <wl@xxxxxxx>
>>> ---
>>> Cc: Jan Beulich <jbeulich@xxxxxxxx>
>>> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>
>>>
>>> v2:
>>> - Reduce patch to just a comment
>>> ---
>>> xen/include/public/arch-x86/hvm/save.h | 2 ++
>>> 1 file changed, 2 insertions(+)
>>>
>>> diff --git a/xen/include/public/arch-x86/hvm/save.h
>> b/xen/include/public/arch-x86/hvm/save.h
>>> index b2ad3fcd74..b3d445acf7 100644
>>> --- a/xen/include/public/arch-x86/hvm/save.h
>>> +++ b/xen/include/public/arch-x86/hvm/save.h
>>> @@ -639,6 +639,8 @@ struct hvm_msr {
>>>
>>> #define CPU_MSR_CODE 20
>>>
>>> +/* Range 22 - 40 reserved for Amazon */
>> What about 21 and 22? And where does the actual number stop, because
>> based on v1, its not 40.
>>
> The range is inclusive (maybe that's not obvious?). For some reason 21 was
> skipped but why do you say the top is not 40? That was what I set
> HVM_SAVE_CODE_MAX to in v1.
You also said that included prospective headroom, which definitely isn't
fair to reserve for ABI breakage reasons.
Which numbers have actually been allocated?
~Andrew
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