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Date: Wed, 4 Apr 2018 16:27:02 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: Juergen Gross <jgross@suse.com>
Cc: stable <stable@vger.kernel.org>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: Patches for stable
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On Wed, Apr 04, 2018 at 12:38:43PM +0200, Juergen Gross wrote:
> Please add the patches:
> 
> commit 038bac2b02989acf1fc938cedcb7944c02672b9f upstream
> commit dfc9327ab7c99bc13e12106448615efba833886b upstream
> commit b17d9d1df3c33a4f1d2bf397e2257aecf9dc56d4 upstream
> 
> to the 4.15 and 4.16 stable kernels.
> 
> Those patches are needed to boot Linux as PVH guest on recent Xen.

So a new feature?  Why is that ok for stable kernels?

> In PVH mode there is no guarantee the kernel can find the RSDP table
> at the legacy location in low memory, which is a requirement for the
> kernel to boot successful without those patches.

Why not just use newer kernels for new Xen features?  This really
doesn't look like a bugfix to me, does it to you?

thanks,

greg k-h