Re: [Xen-devel] [PATCH v2] libxl: put RSDP for PVH guest near 4GB

[George Dunlap <dunlapg@xxxxxxxxx>]

On Wed, Jan 24, 2018 at 3:20 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
> On 24/01/18 16:07, George Dunlap wrote:
>> On Wed, Jan 24, 2018 at 2:10 PM, Boris Ostrovsky
>> <boris.ostrovsky@xxxxxxxxxx> wrote:
>>> On 01/24/2018 07:06 AM, Juergen Gross wrote:
>>>> On 24/01/18 11:54, Roger Pau Monné wrote:
>>>>> On Wed, Jan 24, 2018 at 10:42:39AM +0000, George Dunlap wrote:
>>>>>> On Wed, Jan 24, 2018 at 2:41 AM, Boris Ostrovsky
>>>>>> <boris.ostrovsky@xxxxxxxxxx> wrote:
>>>>>>> On 01/18/2018 05:33 AM, Wei Liu wrote:
>>>>>>>> On Thu, Jan 18, 2018 at 11:31:32AM +0100, Juergen Gross wrote:
>>>>>>>>> Wei,
>>>>>>>>>
>>>>>>>>> On 01/12/17 15:14, Juergen Gross wrote:
>>>>>>>>>> Instead of locating the RSDP table below 1MB put it just below 4GB
>>>>>>>>>> like the rest of the ACPI tables in case of PVH guests. This will
>>>>>>>>>> avoid punching more holes than necessary into the memory map.
>>>>>>>>>>
>>>>>>>>>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>>>>>>>>>> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
>>>>>>>>> Mind applying this one?
>>>>>>>> Don't worry, it is in my queue.
>>>>>>>>
>>>>>>>> Will come to this and other patches I accumulated soon.
>>>>>>>>
>>>>>>>> Wei.
>>>>>>> This requires kernel changes, doesn't it?
>>>>>>>
>>>>>>> https://lists.xenproject.org/archives/html/xen-devel/2017-12/msg00714.html
>>>>>>>
>>>>>>> And this series apparently never made it to the tree.
>>>>>>>
>>>>>>> PVH guests are broken now on staging.
>>>>>> And the Linux side of PVH is officially supported now, right?
>>>
>>>
>>> AFAIK PVH is still considered a tech preview --- Linux or Xen.
>>
>> From SUPPORT.md:
>>
>> ### x86/PVH guest
>>
>>     Status: Supported
>>
>> I was under the impression that PVH guest in Linux was complete and
>> stable as of Linux 4.11.  If that's not true it should have been
>> brought up during the 4.10 development cycle, where we declared PVH
>> domUs as "supported".
>
> So what is the problem here?
>
> - current Linux can't be booted as PVH guest with xen-unstable due to
>   a bug in Linux, patches for Linux are being worked on
> - booting Linux as PVH guest with xen 4.10 is working

I was responding to Boris's claim that PVH is considered tech preview.
I can't say anything one way or the other about PVH in Linux, but PVH
in Xen is definitely now considered supported.

My subsequent response to Roger ("FWIW I can buy this argument") was
meant to indicate I didn't have any more objection to the approach you
guys were planning on taking.

 -George

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