[PATCH v3 0/7] Remove 32-bit Xen PV guest support

From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org, x86@kernel.org,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org
Cc: Juergen Gross <jgross@suse.com>,
	Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Deep Shah <sdeep@vmware.com>,
	"VMware, Inc." <pv-drivers@vmware.com>
Subject: [PATCH v3 0/7] Remove 32-bit Xen PV guest support
Date: Fri,  7 Aug 2020 10:38:19 +0200	[thread overview]
Message-ID: <20200807083826.16794-1-jgross@suse.com> (raw)

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.

Changes in V3:
- addressed comments to V2
- split patch 1 into 2 patches
- new patches 3 and 7

Changes in V2:
- rebase to 5.8 kernel
- addressed comments to V1
- new patches 3 and 4

Juergen Gross (7):
  x86/xen: remove 32-bit Xen PV guest support
  x86/xen: eliminate xen-asm_64.S
  x86/xen: drop tests for highmem in pv code
  x86/paravirt: remove 32-bit support from PARAVIRT_XXL
  x86/paravirt: cleanup paravirt macros
  x86/paravirt: use CONFIG_PARAVIRT_XXL instead of CONFIG_PARAVIRT
  x86/entry/32: revert "Fix XEN_PV build dependency"

 arch/x86/entry/entry_32.S                   | 109 +----
 arch/x86/entry/entry_64.S                   |   4 +-
 arch/x86/entry/vdso/vdso32/note.S           |  30 --
 arch/x86/entry/vdso/vdso32/vclock_gettime.c |   1 +
 arch/x86/include/asm/fixmap.h               |   2 +-
 arch/x86/include/asm/idtentry.h             |   4 +-
 arch/x86/include/asm/paravirt.h             | 107 +----
 arch/x86/include/asm/paravirt_types.h       |  21 -
 arch/x86/include/asm/pgtable-3level_types.h |   5 -
 arch/x86/include/asm/proto.h                |   2 +-
 arch/x86/include/asm/required-features.h    |   2 +-
 arch/x86/include/asm/segment.h              |   6 +-
 arch/x86/kernel/cpu/common.c                |   8 -
 arch/x86/kernel/head_32.S                   |  31 --
 arch/x86/kernel/kprobes/core.c              |   1 -
 arch/x86/kernel/kprobes/opt.c               |   1 -
 arch/x86/kernel/paravirt.c                  |  18 -
 arch/x86/kernel/paravirt_patch.c            |  17 -
 arch/x86/xen/Kconfig                        |   3 +-
 arch/x86/xen/Makefile                       |   3 +-
 arch/x86/xen/apic.c                         |  17 -
 arch/x86/xen/enlighten_pv.c                 |  78 +---
 arch/x86/xen/mmu_pv.c                       | 488 ++++----------------
 arch/x86/xen/p2m.c                          |   6 +-
 arch/x86/xen/setup.c                        |  36 +-
 arch/x86/xen/smp_pv.c                       |  18 -
 arch/x86/xen/vdso.h                         |   6 -
 arch/x86/xen/xen-asm.S                      | 193 +++++++-
 arch/x86/xen/xen-asm_32.S                   | 185 --------
 arch/x86/xen/xen-asm_64.S                   | 192 --------
 arch/x86/xen/xen-head.S                     |   6 -
 drivers/xen/Kconfig                         |   4 +-
 32 files changed, 305 insertions(+), 1299 deletions(-)
 delete mode 100644 arch/x86/xen/vdso.h
 delete mode 100644 arch/x86/xen/xen-asm_32.S
 delete mode 100644 arch/x86/xen/xen-asm_64.S

-- 
2.26.2