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    Subject[PATCH v2 00/43] KVM: Halt-polling and x86 APICv overhaul
    From
    This is basically two series smushed into one.  The first "half" aims
    to differentiate between "halt" and a more generic "block", where "halt"
    aligns with x86's HLT instruction, the halt-polling mechanisms, and
    associated stats, and "block" means any guest action that causes the vCPU
    to block/wait.

    The second "half" overhauls x86's APIC virtualization code (Posted
    Interrupts on Intel VMX, AVIC on AMD SVM) to do their updates in response
    to vCPU (un)blocking in the vcpu_load/put() paths, keying off of the
    vCPU's rcuwait status to determine when a blocking vCPU is being put and
    reloaded. This idea comes from arm64's kvm_timer_vcpu_put(), which I
    stumbled across when diving into the history of arm64's (un)blocking hooks.

    The x86 APICv overhaul allows for killing off several sets of hooks in
    common KVM and in x86 KVM (to the vendor code). Moving everything to
    vcpu_put/load() also realizes nice cleanups, especially for the Posted
    Interrupt code, which required some impressive mental gymnastics to
    understand how vCPU task migration interacted with vCPU blocking.

    Non-x86 folks, sorry for the noise. I'm hoping the common parts can get
    applied without much fuss so that future versions can be x86-only.

    v2:
    - Collect reviews. [Christian, David]
    - Add patch to move arm64 WFI functionality out of hooks. [Marc]
    - Add RISC-V to the fun.
    - Add all the APICv fun.

    v1: https://lkml.kernel.org/r/20210925005528.1145584-1-seanjc@google.com

    Jing Zhang (1):
    KVM: stats: Add stat to detect if vcpu is currently blocking

    Sean Christopherson (42):
    KVM: VMX: Don't unblock vCPU w/ Posted IRQ if IRQs are disabled in
    guest
    KVM: SVM: Ensure target pCPU is read once when signalling AVIC
    doorbell
    KVM: s390: Ensure kvm_arch_no_poll() is read once when blocking vCPU
    KVM: Force PPC to define its own rcuwait object
    KVM: Update halt-polling stats if and only if halt-polling was
    attempted
    KVM: Refactor and document halt-polling stats update helper
    KVM: Reconcile discrepancies in halt-polling stats
    KVM: s390: Clear valid_wakeup in kvm_s390_handle_wait(), not in arch
    hook
    KVM: Drop obsolete kvm_arch_vcpu_block_finish()
    KVM: arm64: Move vGIC v4 handling for WFI out arch callback hook
    KVM: Don't block+unblock when halt-polling is successful
    KVM: x86: Tweak halt emulation helper names to free up kvm_vcpu_halt()
    KVM: Rename kvm_vcpu_block() => kvm_vcpu_halt()
    KVM: Split out a kvm_vcpu_block() helper from kvm_vcpu_halt()
    KVM: Don't redo ktime_get() when calculating halt-polling
    stop/deadline
    KVM: x86: Directly block (instead of "halting") UNINITIALIZED vCPUs
    KVM: x86: Invoke kvm_vcpu_block() directly for non-HALTED wait states
    KVM: Add helpers to wake/query blocking vCPU
    KVM: VMX: Skip Posted Interrupt updates if APICv is hard disabled
    KVM: VMX: Clean up PI pre/post-block WARNs
    KVM: VMX: Drop unnecessary PI logic to handle impossible conditions
    KVM: VMX: Use boolean returns for Posted Interrupt "test" helpers
    KVM: VMX: Drop pointless PI.NDST update when blocking
    KVM: VMX: Save/restore IRQs (instead of CLI/STI) during PI pre/post
    block
    KVM: VMX: Read Posted Interrupt "control" exactly once per loop
    iteration
    KVM: VMX: Move Posted Interrupt ndst computation out of write loop
    KVM: VMX: Remove vCPU from PI wakeup list before updating PID.NV
    KVM: VMX: Handle PI wakeup shenanigans during vcpu_put/load
    KVM: Drop unused kvm_vcpu.pre_pcpu field
    KVM: Move x86 VMX's posted interrupt list_head to vcpu_vmx
    KVM: VMX: Move preemption timer <=> hrtimer dance to common x86
    KVM: x86: Unexport LAPIC's switch_to_{hv,sw}_timer() helpers
    KVM: x86: Remove defunct pre_block/post_block kvm_x86_ops hooks
    KVM: SVM: Signal AVIC doorbell iff vCPU is in guest mode
    KVM: SVM: Don't bother checking for "running" AVIC when kicking for
    IPIs
    KVM: SVM: Unconditionally mark AVIC as running on vCPU load (with
    APICv)
    KVM: Drop defunct kvm_arch_vcpu_(un)blocking() hooks
    KVM: VMX: Don't do full kick when triggering posted interrupt "fails"
    KVM: VMX: Wake vCPU when delivering posted IRQ even if vCPU == this
    vCPU
    KVM: VMX: Pass desired vector instead of bool for triggering posted
    IRQ
    KVM: VMX: Fold fallback path into triggering posted IRQ helper
    KVM: VMX: Don't do full kick when handling posted interrupt wakeup

    arch/arm64/include/asm/kvm_emulate.h | 2 +
    arch/arm64/include/asm/kvm_host.h | 1 -
    arch/arm64/kvm/arch_timer.c | 5 +-
    arch/arm64/kvm/arm.c | 60 +++---
    arch/arm64/kvm/handle_exit.c | 5 +-
    arch/arm64/kvm/psci.c | 2 +-
    arch/mips/include/asm/kvm_host.h | 3 -
    arch/mips/kvm/emulate.c | 2 +-
    arch/powerpc/include/asm/kvm_host.h | 4 +-
    arch/powerpc/kvm/book3s_pr.c | 2 +-
    arch/powerpc/kvm/book3s_pr_papr.c | 2 +-
    arch/powerpc/kvm/booke.c | 2 +-
    arch/powerpc/kvm/powerpc.c | 5 +-
    arch/riscv/include/asm/kvm_host.h | 1 -
    arch/riscv/kvm/vcpu_exit.c | 2 +-
    arch/s390/include/asm/kvm_host.h | 4 -
    arch/s390/kvm/interrupt.c | 3 +-
    arch/s390/kvm/kvm-s390.c | 7 +-
    arch/x86/include/asm/kvm-x86-ops.h | 4 -
    arch/x86/include/asm/kvm_host.h | 29 +--
    arch/x86/kvm/lapic.c | 4 +-
    arch/x86/kvm/svm/avic.c | 95 ++++-----
    arch/x86/kvm/svm/svm.c | 8 -
    arch/x86/kvm/svm/svm.h | 14 --
    arch/x86/kvm/vmx/nested.c | 2 +-
    arch/x86/kvm/vmx/posted_intr.c | 279 ++++++++++++---------------
    arch/x86/kvm/vmx/posted_intr.h | 14 +-
    arch/x86/kvm/vmx/vmx.c | 63 +++---
    arch/x86/kvm/vmx/vmx.h | 3 +
    arch/x86/kvm/x86.c | 55 ++++--
    include/linux/kvm_host.h | 27 ++-
    include/linux/kvm_types.h | 1 +
    virt/kvm/async_pf.c | 2 +-
    virt/kvm/kvm_main.c | 138 +++++++------
    34 files changed, 413 insertions(+), 437 deletions(-)

    --
    2.33.0.882.g93a45727a2-goog

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