Re: [PATCH v2 0/4] Remove 32-bit Xen PV guest support

[JÃrgen GroÃ]

On 02.07.20 16:48, Brian Gerst wrote:
> On Wed, Jul 1, 2020 at 7:07 AM Juergen Gross <jgross@xxxxxxxx> wrote:
> > The long term plan has been to replace Xen PV guests by PVH. The first
> > victim of that plan are now 32-bit PV guests, as those are used only
> > rather seldom these days. Xen on x86 requires 64-bit support and with
> > Grub2 now supporting PVH officially since version 2.04 there is no
> > need to keep 32-bit PV guest support alive in the Linux kernel.
> > Additionally Meltdown mitigation is not available in the kernel running
> > as 32-bit PV guest, so dropping this mode makes sense from security
> > point of view, too.
>
> One thing that you missed is removing VDSO_NOTE_NONEGSEG_BIT from
> vdso32/note.S.  With that removed there is no difference from the
> 64-bit version.

Oh, this means we can probably remove arch/x86/xen/vdso.h completely.

> Otherwise this series looks good to me.

Thanks,


Juergen