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

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.


>> - 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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