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Re: [Xen-devel] [PATCH for 4.13] x86/shim: don't reserve 640k - 1M region in E820


  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
  • Date: Mon, 28 Oct 2019 11:08:59 +0000
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  • Cc: Juergen Gross <jgross@xxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 28 Oct 2019 11:09:11 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 28/10/2019 09:06, Jan Beulich wrote:
> On 28.10.2019 09:56, Sergey Dyasli wrote:
>> Converting a guest from PV to PV-in-PVH makes the guest to have 384k
>> less memory, which may confuse guest's balloon driver. This happens
>> because Xen unconditionally reserves 640k - 1M region in E820 despite
>> the fact that it's really a usable RAM in PVH boot mode.
> 
> This is a PVH property according to your description and according
> to my understanding. Why would you then ...
> 
>> Fix this by skipping the region type change for pv-shim mode.
> 
> ... alter behavior for shim mode only, rather than when booted in
> PVH mode in general?

This is just me being cautious.

My original email does have this text after ---
"The condition can be relaxed to be just !pvh_boot if there are no
plans to support VGA MMIO / ROMs for PVH guests."

I wanted to check with the community about this first.

Thanks,
Sergey

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