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Re: [Xen-devel] [for-4.10] Re: [PATCH v2] tools/libxl: mark special pages as reserved in e820 map for PVH


On 12/06/2017 11:47 AM, Roger Pau Monné wrote:
On Wed, Dec 06, 2017 at 12:22:00PM +0100, Juergen Gross wrote:
On 06/12/17 10:53, Julien Grall wrote:
Hi Juergen,

On 12/05/2017 04:19 PM, Juergen Gross wrote:
On 05/12/17 16:23, Julien Grall wrote:
Hi Juergen,

On 04/12/17 15:49, Juergen Gross wrote:
On 21/11/17 12:06, Juergen Gross wrote:
The "special pages" for PVH guests include the frames for console and
Xenstore ring buffers. Those have to be marked as "Reserved" in the
guest's E820 map, as otherwise conflicts might arise later e.g. when
hotplugging memory into the guest.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
This is a bugfix for PVH guests. Please consider for 4.10.


I was waiting an ack from tools maintainers before looking for a release

I would recommend to tag your patch is 4.10 to help reviewers prioritize
review on your patch. I have done it now.

I am looking at releasing Xen 4.10 in the next few days. Can you explain
the pros/cons of this patch?

Pros: PVH guests with 4GB of memory or more will work. :-)

They never worked before? Or is it a regression? If it is a regression
when did it appear?

Hmm, seems we are lucky: Linux kernel will not try to map any memory
there (I just tested it). So we don't need that patch in 4.10 for Linux
running as PVH guest. Not sure about BSD, though.

I haven't yet committed any PVHv2 support to FreeBSD, but in any case
I always avoid using memory below 4GB just in case...

I will defer this patch post 4.10. We can add a release note if you think it is worth it.


Julien Grall

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