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

[Juergen Gross <jgross@xxxxxxxx>]

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

Juergen

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