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    Subject[PATCH v2 00/21] arm64: Virtualization Host Extension support
    Date
    ARMv8.1 comes with the "Virtualization Host Extension" (VHE for
    short), which enables simpler support of Type-2 hypervisors.

    This extension allows the kernel to directly run at EL2, and
    significantly reduces the number of system registers shared between
    host and guest, reducing the overhead of virtualization.

    In order to have the same kernel binary running on all versions of the
    architecture, this series makes heavy use of runtime code patching.

    The first 20 patches massage the KVM code to deal with VHE and enable
    Linux to run at EL2. The last patch catches an ugly case when VHE
    capable CPUs are paired with some of their less capable siblings. This
    should never happen, but hey...

    I have deliberately left out some of the more "advanced"
    optimizations, as they are likely to distract the reviewer from the
    core infrastructure, which is what I care about at the moment.

    A few things to note:

    - Given that the code has been almost entierely rewritten, I've
    dropped all Acks from the new patches

    - GDB is currently busted on VHE systems, as it checks for version 6
    on the debug architecture, while VHE is version 7. The binutils
    people are on the case.

    This has been tested on the FVP_Base_SLV-V8-A model, and based on
    v4.5-rc1. I've put a branch out on:

    git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe

    * From v1:
    - Full rewrite now that the World Switch is written in C code.
    - Dropped the "early IRQ handling" for the moment.

    Marc Zyngier (21):
    arm/arm64: Add new is_kernel_in_hyp_mode predicate
    arm64: Allow the arch timer to use the HYP timer
    arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature
    arm64: KVM: Skip HYP setup when already running in HYP
    arm64: KVM: VHE: Turn VTCR_EL2 setup into a reusable macro
    arm64: KVM: VHE: Patch out use of HVC
    arm64: KVM: VHE: Patch out kern_hyp_va
    arm64: KVM: VHE: Introduce unified system register accessors
    arm64: KVM: VHE: Differenciate host/guest sysreg save/restore
    arm64: KVM: VHE: Split save/restore of sysregs shared between EL1 and
    EL2
    arm64: KVM: VHE: Use unified system register accessors
    arm64: KVM: VHE: Enable minimal sysreg save/restore
    arm64: KVM: VHE: Make __fpsimd_enabled VHE aware
    arm64: KVM: VHE: Implement VHE activate/deactivate_traps
    arm64: KVM: VHE: Use unified sysreg accessors for timer
    arm64: KVM: VHE: Add fpsimd enabling on guest access
    arm64: KVM: VHE: Add alternative panic handling
    arm64: KVM: Introduce hyp_alternate_value helper
    arm64: KVM: Move most of the fault decoding to C
    arm64: VHE: Add support for running Linux in EL2 mode
    arm64: Panic when VHE and non VHE CPUs coexist

    arch/arm/include/asm/virt.h | 5 ++
    arch/arm/kvm/arm.c | 151 +++++++++++++++++++------------
    arch/arm/kvm/mmu.c | 7 ++
    arch/arm64/Kconfig | 13 +++
    arch/arm64/include/asm/cpufeature.h | 3 +-
    arch/arm64/include/asm/kvm_arm.h | 1 +
    arch/arm64/include/asm/kvm_emulate.h | 3 +
    arch/arm64/include/asm/kvm_mmu.h | 34 ++++++-
    arch/arm64/include/asm/virt.h | 27 ++++++
    arch/arm64/kernel/asm-offsets.c | 3 -
    arch/arm64/kernel/cpufeature.c | 15 +++-
    arch/arm64/kernel/head.S | 51 ++++++++++-
    arch/arm64/kernel/smp.c | 3 +
    arch/arm64/kvm/hyp-init.S | 18 +---
    arch/arm64/kvm/hyp.S | 7 ++
    arch/arm64/kvm/hyp/entry.S | 6 ++
    arch/arm64/kvm/hyp/hyp-entry.S | 107 +++++++---------------
    arch/arm64/kvm/hyp/hyp.h | 119 ++++++++++++++++++++++--
    arch/arm64/kvm/hyp/switch.c | 170 +++++++++++++++++++++++++++++++----
    arch/arm64/kvm/hyp/sysreg-sr.c | 147 ++++++++++++++++++++----------
    arch/arm64/kvm/hyp/timer-sr.c | 10 +--
    drivers/clocksource/arm_arch_timer.c | 96 ++++++++++++--------
    22 files changed, 724 insertions(+), 272 deletions(-)

    --
    2.1.4

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