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

On 02.07.20 16:48, Brian Gerst wrote:

On Wed, Jul 1, 2020 at 7:07 AM Juergen Gross [off-list ref] wrote:

quoted

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