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

[Juergen Gross <jgross@xxxxxxxx>]

On 24/01/18 17:10, Boris Ostrovsky wrote:
> On 01/24/2018 10:26 AM, George Dunlap wrote:
>> 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".
> 
> 
> OK, I missed that, sorry.
> 
> I though we were going to wait for PCI passthrough to become available
> until declaring it 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
> 
> I would prefer for patches to first show up in Linux. Otherwise we will
> be adding Xen code without any means to test it with PVH guests. And
> then, when Linux does get proper RSDP support for PVH and tries to boot,
> we may discover that all sorts of unrelated things are broken.

I wanted to do it this way.

My Linux patches were accepted for 4.16 and only then I sent the Xen
patches. Unfortunately the grub2 bug resulted in the Linux patches being
put on hold.


Juergen

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