[PATCH v2 0/5] KVM: drop 32-bit host support on all architectures

Arnd Bergmann
2024-12-21T21:49:14Z

From: Arnd Bergmann <arnd@arndb.de>

I've updated my RFC patches based on the feedback, changing mainly
the powerpc code.

I submitted a patch to remove KVM support for x86-32 hosts earlier
this month, but there were still concerns that this might be useful for
testing 32-bit host in general, as that remains supported on three other
architectures. I have gone through those three now and prepared similar
patches, as all of them seem to be equally obsolete.

Support for 32-bit KVM host on Arm hardware was dropped back in 2020
because of lack of users, despite Cortex-A7/A15/A17 based SoCs being
much more widely deployed than the other virtualization capable 32-bit
CPUs (Intel Core Duo/Silverthorne, PowerPC e300/e500/e600, MIPS P5600)
combined.

I hope this can get merged through the KVM tree as a whole series.

Arnd

---
v2 changes:
- rebase to kvm #next branch
- improve changelog text for x86
- many updates for powerpc, thanks to Christophe Leroy for suggestions

Link: https://lore.kernel.org/lkml/Z1B1phcpbiYWLgCD@google.com/
Link: https://lore.kernel.org/lkml/20241212125516.467123-1-arnd@kernel.org/

Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Naveen N Rao <naveen@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Crystal Wood <crwood@redhat.com>
Cc: Anup Patel <anup@brainfault.org>
Cc: Atish Patra <atishp@atishpatra.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: x86@kernel.org
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Paul Durrant <paul@xen.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: kvm@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: kvm-riscv@lists.infradead.org
Cc: linux-riscv@lists.infradead.org

Arnd Bergmann (5):
mips: kvm: drop support for 32-bit hosts
riscv: kvm: drop 32-bit host support
powerpc: kvm: drop 32-bit booke
powerpc: kvm: drop 32-bit book3s
x86: kvm drop 32-bit host support

MAINTAINERS | 2 +-
arch/mips/Kconfig | 3 -
arch/mips/include/asm/kvm_host.h | 4 -
arch/mips/kvm/Kconfig | 1 +
arch/mips/kvm/emulate.c | 8 -
arch/mips/kvm/msa.S | 12 -
arch/mips/kvm/vz.c | 22 -
arch/powerpc/include/asm/kvm_book3s.h | 17 -
arch/powerpc/include/asm/kvm_book3s_32.h | 36 --
arch/powerpc/include/asm/kvm_book3s_asm.h | 10 -
arch/powerpc/include/asm/kvm_booke.h | 4 -
arch/powerpc/include/asm/kvm_booke_hv_asm.h | 2 -
arch/powerpc/include/asm/kvm_host.h | 2 +-
arch/powerpc/include/asm/kvm_ppc.h | 2 +-
arch/powerpc/include/asm/processor.h | 3 -
arch/powerpc/kernel/asm-offsets.c | 21 +-
arch/powerpc/kernel/head_32.h | 10 -
arch/powerpc/kernel/head_85xx.S | 14 -
arch/powerpc/kernel/head_book3s_32.S | 5 -
arch/powerpc/kernel/head_booke.h | 39 --
arch/powerpc/kvm/Kconfig | 44 +-
arch/powerpc/kvm/Makefile | 30 --
arch/powerpc/kvm/book3s.c | 18 -
arch/powerpc/kvm/book3s_32_mmu_host.c | 396 --------------
arch/powerpc/kvm/book3s_emulate.c | 37 --
arch/powerpc/kvm/book3s_interrupts.S | 11 -
arch/powerpc/kvm/book3s_mmu_hpte.c | 12 -
arch/powerpc/kvm/book3s_pr.c | 122 +----
arch/powerpc/kvm/book3s_rmhandlers.S | 110 ----
arch/powerpc/kvm/book3s_segment.S | 30 +-
arch/powerpc/kvm/booke.c | 268 ----------
arch/powerpc/kvm/booke.h | 8 -
arch/powerpc/kvm/booke_emulate.c | 44 --
arch/powerpc/kvm/booke_interrupts.S | 535 -------------------
arch/powerpc/kvm/bookehv_interrupts.S | 102 ----
arch/powerpc/kvm/e500.c | 553 --------------------
arch/powerpc/kvm/e500.h | 40 --
arch/powerpc/kvm/e500_emulate.c | 100 ----
arch/powerpc/kvm/e500_mmu_host.c | 54 --
arch/powerpc/kvm/e500mc.c | 5 +-
arch/powerpc/kvm/emulate.c | 2 -
arch/powerpc/kvm/powerpc.c | 2 -
arch/powerpc/kvm/trace_booke.h | 14 -
arch/riscv/kvm/Kconfig | 2 +-
arch/riscv/kvm/aia.c | 105 ----
arch/riscv/kvm/aia_imsic.c | 34 --
arch/riscv/kvm/mmu.c | 8 -
arch/riscv/kvm/vcpu_exit.c | 4 -
arch/riscv/kvm/vcpu_insn.c | 12 -
arch/riscv/kvm/vcpu_sbi_pmu.c | 8 -
arch/riscv/kvm/vcpu_sbi_replace.c | 4 -
arch/riscv/kvm/vcpu_sbi_v01.c | 4 -
arch/riscv/kvm/vcpu_timer.c | 20 -
arch/x86/kvm/Kconfig | 6 +-
arch/x86/kvm/Makefile | 4 +-
arch/x86/kvm/cpuid.c | 2 +-
arch/x86/kvm/emulate.c | 34 +-
arch/x86/kvm/fpu.h | 4 -
arch/x86/kvm/hyperv.c | 5 +-
arch/x86/kvm/i8254.c | 4 -
arch/x86/kvm/kvm_cache_regs.h | 2 -
arch/x86/kvm/kvm_emulate.h | 8 -
arch/x86/kvm/lapic.c | 4 -
arch/x86/kvm/mmu.h | 4 -
arch/x86/kvm/mmu/mmu.c | 134 -----
arch/x86/kvm/mmu/mmu_internal.h | 9 -
arch/x86/kvm/mmu/paging_tmpl.h | 9 -
arch/x86/kvm/mmu/spte.h | 5 -
arch/x86/kvm/mmu/tdp_mmu.h | 4 -
arch/x86/kvm/smm.c | 19 -
arch/x86/kvm/svm/sev.c | 2 -
arch/x86/kvm/svm/svm.c | 23 +-
arch/x86/kvm/svm/vmenter.S | 20 -
arch/x86/kvm/trace.h | 4 -
arch/x86/kvm/vmx/main.c | 2 -
arch/x86/kvm/vmx/nested.c | 24 +-
arch/x86/kvm/vmx/vmcs.h | 2 -
arch/x86/kvm/vmx/vmenter.S | 25 +-
arch/x86/kvm/vmx/vmx.c | 117 +----
arch/x86/kvm/vmx/vmx.h | 23 +-
arch/x86/kvm/vmx/vmx_ops.h | 7 -
arch/x86/kvm/vmx/x86_ops.h | 2 -
arch/x86/kvm/x86.c | 74 +--
arch/x86/kvm/x86.h | 4 -
arch/x86/kvm/xen.c | 61 +--
85 files changed, 66 insertions(+), 3536 deletions(-)
delete mode 100644 arch/powerpc/include/asm/kvm_book3s_32.h
delete mode 100644 arch/powerpc/kvm/book3s_32_mmu_host.c
delete mode 100644 arch/powerpc/kvm/booke_interrupts.S
delete mode 100644 arch/powerpc/kvm/e500.c

--
2.39.5