Re: [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support

[Itaru Kitayama <itaru.kitayama@gmail.com>]

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Marc,
Only possible way to test this series is to get
on Fast Model?

On Fri, Jun 21, 2019 at 18:55 Marc Zyngier <marc.zyngier@arm.com> wrote:

> I've taken over the maintenance of this series originally written by
> Jintack and Christoffer. Since then, the series has been substantially
> reworked, new features (and most probably bugs) have been added, and
> the whole thing rebased multiple times. If anything breaks, please
> blame me, and nobody else.
>
> As you can tell, this is quite big. It is also remarkably incomplete
> (we're missing many critical bits for fully emulate EL2), but the idea
> is to start merging things early in order to reduce the maintenance
> headache. What we want to achieve is that with NV disabled, there is
> no performance overhead and no regression. The only thing I intend to
> merge ASAP is the first patch in the series, because it should have
> zero effect and is a reasonable cleanup.
>
> The series is roughly divided in 4 parts: exception handling, memory
> virtualization, interrupts and timers. There are of course some
> dependencies, but you'll hopefully get the gist of it.
>
> For the most courageous of you, I've put out a branch[1] containing this
> and a bit more. Of course, you'll need some userspace. Andre maintains
> a hacked version of kvmtool[1] that takes a --nested option, allowing
> the guest to be started at EL2. You can run the whole stack in the
> Foundation model. Don't be in a hurry ;-).
>
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
> kvm-arm64/nv-wip-5.2-rc5
> [2] git://linux-arm.org/kvmtool.git nv/nv-wip-5.2-rc5
>
> Andre Przywara (4):
>   KVM: arm64: nv: Handle virtual EL2 registers in
>     vcpu_read/write_sys_reg()
>   KVM: arm64: nv: Save/Restore vEL2 sysregs
>   KVM: arm64: nv: Handle traps for timer _EL02 and _EL2 sysregs
>     accessors
>   KVM: arm64: nv: vgic: Allow userland to set VGIC maintenance IRQ
>
> Christoffer Dall (16):
>   KVM: arm64: nv: Introduce nested virtualization VCPU feature
>   KVM: arm64: nv: Reset VCPU to EL2 registers if VCPU nested virt is set
>   KVM: arm64: nv: Allow userspace to set PSR_MODE_EL2x
>   KVM: arm64: nv: Add nested virt VCPU primitives for vEL2 VCPU state
>   KVM: arm64: nv: Handle trapped ERET from virtual EL2
>   KVM: arm64: nv: Emulate PSTATE.M for a guest hypervisor
>   KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2
>   KVM: arm64: nv: Only toggle cache for virtual EL2 when SCTLR_EL2
>     changes
>   KVM: arm/arm64: nv: Support multiple nested stage 2 mmu structures
>   KVM: arm64: nv: Implement nested Stage-2 page table walk logic
>   KVM: arm64: nv: Handle shadow stage 2 page faults
>   KVM: arm64: nv: Unmap/flush shadow stage 2 page tables
>   KVM: arm64: nv: arch_timer: Support hyp timer emulation
>   KVM: arm64: nv: vgic-v3: Take cpu_if pointer directly instead of vcpu
>   KVM: arm64: nv: vgic: Emulate the HW bit in software
>   KVM: arm64: nv: Add nested GICv3 tracepoints
>
> Dave Martin (1):
>   KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s
>
> Jintack Lim (21):
>   arm64: Add ARM64_HAS_NESTED_VIRT cpufeature
>   KVM: arm64: nv: Add EL2 system registers to vcpu context
>   KVM: arm64: nv: Support virtual EL2 exceptions
>   KVM: arm64: nv: Inject HVC exceptions to the virtual EL2
>   KVM: arm64: nv: Trap SPSR_EL1, ELR_EL1 and VBAR_EL1 from virtual EL2
>   KVM: arm64: nv: Trap CPACR_EL1 access in virtual EL2
>   KVM: arm64: nv: Set a handler for the system instruction traps
>   KVM: arm64: nv: Handle PSCI call via smc from the guest
>   KVM: arm64: nv: Respect virtual HCR_EL2.TWX setting
>   KVM: arm64: nv: Respect virtual CPTR_EL2.TFP setting
>   KVM: arm64: nv: Respect the virtual HCR_EL2.NV bit setting
>   KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings
>   KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting
>   KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2
>   KVM: arm64: nv: Configure HCR_EL2 for nested virtualization
>   KVM: arm64: nv: Pretend we only support larger-than-host page sizes
>   KVM: arm64: nv: Introduce sys_reg_desc.forward_trap
>   KVM: arm64: nv: Rework the system instruction emulation framework
>   KVM: arm64: nv: Trap and emulate AT instructions from virtual EL2
>   KVM: arm64: nv: Trap and emulate TLBI instructions from virtual EL2
>   KVM: arm64: nv: Nested GICv3 Support
>
> Marc Zyngier (17):
>   KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h
>   KVM: arm64: nv: Reset VMPIDR_EL2 and VPIDR_EL2 to sane values
>   KVM: arm64: nv: Handle SPSR_EL2 specially
>   KVM: arm64: nv: Refactor vcpu_{read,write}_sys_reg
>   KVM: arm64: nv: Don't expose SVE to nested guests
>   KVM: arm64: nv: Hide RAS from nested guests
>   KVM: arm/arm64: nv: Factor out stage 2 page table data from struct kvm
>   KVM: arm64: nv: Move last_vcpu_ran to be per s2 mmu
>   KVM: arm64: nv: Don't always start an S2 MMU search from the beginning
>   KVM: arm64: nv: Propagate CNTVOFF_EL2 to the virtual EL1 timer
>   KVM: arm64: nv: Load timer before the GIC
>   KVM: arm64: nv: Implement maintenance interrupt forwarding
>   arm64: KVM: nv: Add handling of EL2-specific timer registers
>   arm64: KVM: nv: Honor SCTLR_EL2.SPAN on entering vEL2
>   arm64: KVM: nv: Handle SCTLR_EL2 RES0/RES1 bits
>   arm64: KVM: nv: Restrict S2 RD/WR permissions to match the guest's
>   arm64: KVM: nv: Allow userspace to request KVM_ARM_VCPU_NESTED_VIRT
>
>  .../admin-guide/kernel-parameters.txt         |    4 +
>  .../virtual/kvm/devices/arm-vgic-v3.txt       |    9 +
>  arch/arm/include/asm/kvm_asm.h                |    5 +-
>  arch/arm/include/asm/kvm_emulate.h            |    3 +
>  arch/arm/include/asm/kvm_host.h               |   31 +-
>  arch/arm/include/asm/kvm_hyp.h                |   25 +-
>  arch/arm/include/asm/kvm_mmu.h                |   83 +-
>  arch/arm/include/asm/kvm_nested.h             |    9 +
>  arch/arm/include/uapi/asm/kvm.h               |    1 +
>  arch/arm/kvm/hyp/switch.c                     |   11 +-
>  arch/arm/kvm/hyp/tlb.c                        |   13 +-
>  arch/arm64/include/asm/cpucaps.h              |    3 +-
>  arch/arm64/include/asm/esr.h                  |    4 +-
>  arch/arm64/include/asm/kvm_arm.h              |   28 +-
>  arch/arm64/include/asm/kvm_asm.h              |    9 +-
>  arch/arm64/include/asm/kvm_coproc.h           |    2 +-
>  arch/arm64/include/asm/kvm_emulate.h          |  157 +-
>  arch/arm64/include/asm/kvm_host.h             |  105 +-
>  arch/arm64/include/asm/kvm_hyp.h              |   82 +-
>  arch/arm64/include/asm/kvm_mmu.h              |   62 +-
>  arch/arm64/include/asm/kvm_nested.h           |   68 +
>  arch/arm64/include/asm/sysreg.h               |  143 +-
>  arch/arm64/include/uapi/asm/kvm.h             |    2 +
>  arch/arm64/kernel/cpufeature.c                |   26 +
>  arch/arm64/kvm/Makefile                       |    4 +
>  arch/arm64/kvm/emulate-nested.c               |  223 +++
>  arch/arm64/kvm/guest.c                        |    6 +
>  arch/arm64/kvm/handle_exit.c                  |   76 +-
>  arch/arm64/kvm/hyp/Makefile                   |    1 +
>  arch/arm64/kvm/hyp/at.c                       |  217 +++
>  arch/arm64/kvm/hyp/switch.c                   |   86 +-
>  arch/arm64/kvm/hyp/sysreg-sr.c                |  267 ++-
>  arch/arm64/kvm/hyp/tlb.c                      |  129 +-
>  arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c      |    2 +-
>  arch/arm64/kvm/inject_fault.c                 |   12 -
>  arch/arm64/kvm/nested.c                       |  551 +++++++
>  arch/arm64/kvm/regmap.c                       |    4 +-
>  arch/arm64/kvm/reset.c                        |    7 +
>  arch/arm64/kvm/sys_regs.c                     | 1460 +++++++++++++++--
>  arch/arm64/kvm/sys_regs.h                     |    6 +
>  arch/arm64/kvm/trace.h                        |   58 +-
>  include/kvm/arm_arch_timer.h                  |    6 +
>  include/kvm/arm_vgic.h                        |   28 +-
>  virt/kvm/arm/arch_timer.c                     |  158 +-
>  virt/kvm/arm/arm.c                            |   62 +-
>  virt/kvm/arm/hyp/vgic-v3-sr.c                 |   35 +-
>  virt/kvm/arm/mmio.c                           |   12 +-
>  virt/kvm/arm/mmu.c                            |  445 +++--
>  virt/kvm/arm/trace.h                          |    6 +-
>  virt/kvm/arm/vgic/vgic-init.c                 |   30 +
>  virt/kvm/arm/vgic/vgic-kvm-device.c           |   22 +
>  virt/kvm/arm/vgic/vgic-nested-trace.h         |  137 ++
>  virt/kvm/arm/vgic/vgic-v2.c                   |   10 +-
>  virt/kvm/arm/vgic/vgic-v3-nested.c            |  236 +++
>  virt/kvm/arm/vgic/vgic-v3.c                   |   40 +-
>  virt/kvm/arm/vgic/vgic.c                      |   74 +-
>  56 files changed, 4683 insertions(+), 612 deletions(-)
>  create mode 100644 arch/arm/include/asm/kvm_nested.h
>  create mode 100644 arch/arm64/include/asm/kvm_nested.h
>  create mode 100644 arch/arm64/kvm/emulate-nested.c
>  create mode 100644 arch/arm64/kvm/hyp/at.c
>  create mode 100644 arch/arm64/kvm/nested.c
>  create mode 100644 virt/kvm/arm/vgic/vgic-nested-trace.h
>  create mode 100644 virt/kvm/arm/vgic/vgic-v3-nested.c
>
> --
> 2.20.1
>
>
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> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

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