Re: [Xen-devel] Patch "x86/xen: Add pvh specific rsdp address retrieval function" has been added to the 4.16-stable tree

[Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>]

On Wed, May 02, 2018 at 11:23:12AM +0200, Juergen Gross wrote:
> On 02/05/18 00:33, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
> > 
> > This is a note to let you know that I've just added the patch titled
> > 
> >     x86/xen: Add pvh specific rsdp address retrieval function
> > 
> > to the 4.16-stable tree which can be found at:
> >     
> > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
> > 
> > The filename of the patch is:
> >      x86-xen-add-pvh-specific-rsdp-address-retrieval-function.patch
> > and it can be found in the queue-4.16 subdirectory.
> > 
> > If you, or anyone else, feels it should not be added to the stable tree,
> > please let <stable@xxxxxxxxxxxxxxx> know about it.
> > 
> > 
> > From foo@baz Tue May  1 14:59:18 PDT 2018
> > From: Juergen Gross <jgross@xxxxxxxx>
> > Date: Mon, 19 Feb 2018 11:09:06 +0100
> > Subject: x86/xen: Add pvh specific rsdp address retrieval function
> > 
> > From: Juergen Gross <jgross@xxxxxxxx>
> > 
> > [ Upstream commit b17d9d1df3c33a4f1d2bf397e2257aecf9dc56d4 ]
> > 
> > Add pvh_get_root_pointer() for Xen PVH guests to communicate the
> > address of the RSDP table given to the kernel via Xen start info.
> > 
> > This makes the kernel boot again in PVH mode after on recent Xen the
> > RSDP was moved to higher addresses. So up to that change it was pure
> > luck that the legacy method to locate the RSDP was working when
> > running as PVH mode.
> > 
> > Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> > Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> > Cc: Borislav Petkov <bp@xxxxxxxxx>
> > Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
> > Cc: H. Peter Anvin <hpa@xxxxxxxxx>
> > Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> > Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> > Cc: boris.ostrovsky@xxxxxxxxxx
> > Cc: lenb@xxxxxxxxxx
> > Cc: linux-acpi@xxxxxxxxxxxxxxx
> > Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
> > Link: http://lkml.kernel.org/r/20180219100906.14265-4-jgross@xxxxxxxx
> > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
> > Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> 
> Thanks for adding this patch.
> 
> For making it compile I think you'll need upstream commits
> 038bac2b02989acf1fc938cedcb7944c02672b9f and
> dfc9327ab7c99bc13e12106448615efba833886b.

I'll just drop this and if Sasha thinks it is worth it, he can backport
these other two patches and resend them.  Especially as I think we
already talked about this in the past :)

thanks,

greg k-h

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