Hi Marc, On 10.02.2020 15:13, Marc Zyngier wrote: > KVM/arm was merged just over 7 years ago, and has lived a very quiet > life so far. It mostly works if you're prepared to deal with its > limitations, it has been a good prototype for the arm64 version, > but it suffers a few problems: > > - It is incomplete (no debug support, no PMU) > - It hasn't followed any of the architectural evolutions > - It has zero users (I don't count myself here) > - It is more and more getting in the way of new arm64 developments That is a bit sad information. Mainline Exynos finally got everything that was needed to run it on the quite popular Samsung Exynos5422-based Odroid XU4/HC1/MC1 boards. According to the Odroid related forums it is being used. We also use it internally at Samsung. > So here it is: unless someone screams and shows that they rely on > KVM/arm to be maintained upsteam, I'll remove 32bit host support > form the tree. One of the reasons that makes me confident nobody is > using it is that I never receive *any* bug report. Yes, it is perfect. > But if you depend on KVM/arm being available in mainline, please shout. > > To reiterate: 32bit guest support for arm64 stays, of course. Only > 32bit host goes. Once this is merged, I plan to move virt/kvm/arm to > arm64, and cleanup all the now unnecessary abstractions. > > The patches have been generated with the -D option to avoid spamming > everyone with huge diffs, and there is a kvm-arm/goodbye branch in > my kernel.org repository. > > Marc Zyngier (5): > arm: Unplug KVM from the build system > arm: Remove KVM from config files > arm: Remove 32bit KVM host support > arm: Remove HYP/Stage-2 page-table support > arm: Remove GICv3 vgic compatibility macros > > Documentation/virt/kvm/arm/hyp-abi.txt | 5 + > arch/arm/Kconfig | 2 - > arch/arm/Makefile | 1 - > arch/arm/configs/axm55xx_defconfig | 2 - > arch/arm/include/asm/arch_gicv3.h | 114 -- > arch/arm/include/asm/kvm_arm.h | 239 ---- > arch/arm/include/asm/kvm_asm.h | 77 -- > arch/arm/include/asm/kvm_coproc.h | 36 - > arch/arm/include/asm/kvm_emulate.h | 372 ------ > arch/arm/include/asm/kvm_host.h | 459 -------- > arch/arm/include/asm/kvm_hyp.h | 127 --- > arch/arm/include/asm/kvm_mmu.h | 435 ------- > arch/arm/include/asm/kvm_ras.h | 14 - > arch/arm/include/asm/pgtable-3level.h | 20 - > arch/arm/include/asm/pgtable.h | 9 - > arch/arm/include/asm/sections.h | 6 +- > arch/arm/include/asm/stage2_pgtable.h | 75 -- > arch/arm/include/asm/virt.h | 12 - > arch/arm/include/uapi/asm/kvm.h | 314 ----- > arch/arm/kernel/asm-offsets.c | 11 - > arch/arm/kernel/vmlinux-xip.lds.S | 8 - > arch/arm/kernel/vmlinux.lds.S | 8 - > arch/arm/kernel/vmlinux.lds.h | 10 - > arch/arm/kvm/Kconfig | 59 - > arch/arm/kvm/Makefile | 43 - > arch/arm/kvm/coproc.c | 1455 ------------------------ > arch/arm/kvm/coproc.h | 130 --- > arch/arm/kvm/coproc_a15.c | 39 - > arch/arm/kvm/coproc_a7.c | 42 - > arch/arm/kvm/emulate.c | 166 --- > arch/arm/kvm/guest.c | 387 ------- > arch/arm/kvm/handle_exit.c | 175 --- > arch/arm/kvm/hyp/Makefile | 34 - > arch/arm/kvm/hyp/banked-sr.c | 70 -- > arch/arm/kvm/hyp/cp15-sr.c | 72 -- > arch/arm/kvm/hyp/entry.S | 121 -- > arch/arm/kvm/hyp/hyp-entry.S | 295 ----- > arch/arm/kvm/hyp/s2-setup.c | 22 - > arch/arm/kvm/hyp/switch.c | 242 ---- > arch/arm/kvm/hyp/tlb.c | 68 -- > arch/arm/kvm/hyp/vfp.S | 57 - > arch/arm/kvm/init.S | 157 --- > arch/arm/kvm/interrupts.S | 36 - > arch/arm/kvm/irq.h | 16 - > arch/arm/kvm/reset.c | 86 -- > arch/arm/kvm/trace.h | 86 -- > arch/arm/kvm/vgic-v3-coproc.c | 27 - > arch/arm/mach-exynos/Kconfig | 2 +- > arch/arm/mm/mmu.c | 26 - > 49 files changed, 7 insertions(+), 6262 deletions(-) > delete mode 100644 arch/arm/include/asm/kvm_arm.h > delete mode 100644 arch/arm/include/asm/kvm_asm.h > delete mode 100644 arch/arm/include/asm/kvm_coproc.h > delete mode 100644 arch/arm/include/asm/kvm_emulate.h > delete mode 100644 arch/arm/include/asm/kvm_host.h > delete mode 100644 arch/arm/include/asm/kvm_hyp.h > delete mode 100644 arch/arm/include/asm/kvm_mmu.h > delete mode 100644 arch/arm/include/asm/kvm_ras.h > delete mode 100644 arch/arm/include/asm/stage2_pgtable.h > delete mode 100644 arch/arm/include/uapi/asm/kvm.h > delete mode 100644 arch/arm/kvm/Kconfig > delete mode 100644 arch/arm/kvm/Makefile > delete mode 100644 arch/arm/kvm/coproc.c > delete mode 100644 arch/arm/kvm/coproc.h > delete mode 100644 arch/arm/kvm/coproc_a15.c > delete mode 100644 arch/arm/kvm/coproc_a7.c > delete mode 100644 arch/arm/kvm/emulate.c > delete mode 100644 arch/arm/kvm/guest.c > delete mode 100644 arch/arm/kvm/handle_exit.c > delete mode 100644 arch/arm/kvm/hyp/Makefile > delete mode 100644 arch/arm/kvm/hyp/banked-sr.c > delete mode 100644 arch/arm/kvm/hyp/cp15-sr.c > delete mode 100644 arch/arm/kvm/hyp/entry.S > delete mode 100644 arch/arm/kvm/hyp/hyp-entry.S > delete mode 100644 arch/arm/kvm/hyp/s2-setup.c > delete mode 100644 arch/arm/kvm/hyp/switch.c > delete mode 100644 arch/arm/kvm/hyp/tlb.c > delete mode 100644 arch/arm/kvm/hyp/vfp.S > delete mode 100644 arch/arm/kvm/init.S > delete mode 100644 arch/arm/kvm/interrupts.S > delete mode 100644 arch/arm/kvm/irq.h > delete mode 100644 arch/arm/kvm/reset.c > delete mode 100644 arch/arm/kvm/trace.h > delete mode 100644 arch/arm/kvm/vgic-v3-coproc.c > Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
