arch/arm64/kvm/arch_timer.c       |  2 +-
 arch/arm64/kvm/arm.c              |  2 +-
 arch/arm64/kvm/handle_exit.c      |  2 +-
 arch/arm64/kvm/psci.c             |  2 +-
 arch/mips/kvm/emulate.c           |  2 +-
 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        |  2 +-
 arch/riscv/kvm/vcpu_exit.c        |  2 +-
 arch/s390/kvm/interrupt.c         |  2 +-
 arch/x86/kvm/x86.c                | 11 +++++++++--
 include/linux/kvm_host.h          |  2 +-
 virt/kvm/kvm_main.c               | 20 +++++++++-----------
 14 files changed, 30 insertions(+), 25 deletions(-)

diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c
index 3df67c127489..7e8396f74010 100644
--- a/arch/arm64/kvm/arch_timer.c
+++ b/arch/arm64/kvm/arch_timer.c

@@ -467,7 +467,7 @@ static void timer_save_state(struct arch_timer_context *ctx)
 }

 /*
- * Schedule the background timer before calling kvm_vcpu_block, so that this
+ * Schedule the background timer before calling kvm_vcpu_halt, so that this
  * thread is removed from its waitqueue and made runnable when there's a timer
  * interrupt to handle.
  */

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 1346f81b34df..268b1e7bf700 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c

@@ -672,7 +672,7 @@ void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
        vgic_v4_put(vcpu, true);
        preempt_enable();

-       kvm_vcpu_block(vcpu);
+       kvm_vcpu_halt(vcpu);
        kvm_clear_request(KVM_REQ_UNHALT, vcpu);

        preempt_disable();

diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index 4794563a506b..6d0baf71aa67 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c

@@ -82,7 +82,7 @@ static int handle_no_fpsimd(struct kvm_vcpu *vcpu)
  *
  * WFE: Yield the CPU and come back to this vcpu when the scheduler
  * decides to.
- * WFI: Simply call kvm_vcpu_block(), which will halt execution of
+ * WFI: Simply call kvm_vcpu_halt(), which will halt execution of
  * world-switches and schedule other host processes until there is an
  * incoming IRQ or FIQ to the VM.
  */

diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
index 74c47d420253..e275b2ca08b9 100644
--- a/arch/arm64/kvm/psci.c
+++ b/arch/arm64/kvm/psci.c

@@ -46,7 +46,7 @@ static unsigned long kvm_psci_vcpu_suspend(struct kvm_vcpu *vcpu)
         * specification (ARM DEN 0022A). This means all suspend states
         * for KVM will preserve the register state.
         */
-       kvm_vcpu_block(vcpu);
+       kvm_vcpu_halt(vcpu);
        kvm_clear_request(KVM_REQ_UNHALT, vcpu);

        return PSCI_RET_SUCCESS;

diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
index 22e745e49b0a..b494d8d39290 100644
--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c

@@ -952,7 +952,7 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu)
        if (!vcpu->arch.pending_exceptions) {
                kvm_vz_lose_htimer(vcpu);
                vcpu->arch.wait = 1;
-               kvm_vcpu_block(vcpu);
+               kvm_vcpu_halt(vcpu);

                /*
                 * We we are runnable, then definitely go off to user space to

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 6bc9425acb32..0ced1b16f0e5 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c

@@ -492,7 +492,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)

        if (msr & MSR_POW) {
                if (!vcpu->arch.pending_exceptions) {
-                       kvm_vcpu_block(vcpu);
+                       kvm_vcpu_halt(vcpu);
                        kvm_clear_request(KVM_REQ_UNHALT, vcpu);
                        vcpu->stat.generic.halt_wakeup++;

diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index ac14239f3424..1f10e7dfcdd0 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c

@@ -376,7 +376,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
                return kvmppc_h_pr_stuff_tce(vcpu);
        case H_CEDE:
                kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
-               kvm_vcpu_block(vcpu);
+               kvm_vcpu_halt(vcpu);
                kvm_clear_request(KVM_REQ_UNHALT, vcpu);
                vcpu->stat.generic.halt_wakeup++;
                return EMULATE_DONE;

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 977801c83aff..12abffa40cd9 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c

@@ -718,7 +718,7 @@ int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)

        if (vcpu->arch.shared->msr & MSR_WE) {
                local_irq_enable();
-               kvm_vcpu_block(vcpu);
+               kvm_vcpu_halt(vcpu);
                kvm_clear_request(KVM_REQ_UNHALT, vcpu);
                hard_irq_disable();

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index be22da157569..6a94545b99fc 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c

@@ -236,7 +236,7 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
                break;
        case EV_HCALL_TOKEN(EV_IDLE):
                r = EV_SUCCESS;
-               kvm_vcpu_block(vcpu);
+               kvm_vcpu_halt(vcpu);
                kvm_clear_request(KVM_REQ_UNHALT, vcpu);
                break;
        default:

diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c
index 13bbc3f73713..949bb9828aa5 100644
--- a/arch/riscv/kvm/vcpu_exit.c
+++ b/arch/riscv/kvm/vcpu_exit.c

@@ -146,7 +146,7 @@ static int system_opcode_insn(struct kvm_vcpu *vcpu,
                vcpu->stat.wfi_exit_stat++;
                if (!kvm_arch_vcpu_runnable(vcpu)) {
                        srcu_read_unlock(&vcpu->kvm->srcu, vcpu->arch.srcu_idx);
-                       kvm_vcpu_block(vcpu);
+                       kvm_vcpu_halt(vcpu);
                        vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
                        kvm_clear_request(KVM_REQ_UNHALT, vcpu);
                }

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 520450a7956f..10bd648170b7 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c

@@ -1335,7 +1335,7 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
        VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
 no_timer:
        srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
-       kvm_vcpu_block(vcpu);
+       kvm_vcpu_halt(vcpu);
        vcpu->valid_wakeup = false;
        __unset_cpu_idle(vcpu);
        vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9c23ae1d483d..e6c17bbed25c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c

@@ -8651,6 +8651,13 @@ void kvm_arch_exit(void)

 static int __kvm_emulate_halt(struct kvm_vcpu *vcpu, int state, int reason)
 {
+       /*
+        * The vCPU has halted, e.g. executed HLT.  Update the run state if the
+        * local APIC is in-kernel, the run loop will detect the non-runnable
+        * state and halt the vCPU.  Exit to userspace if the local APIC is
+        * managed by userspace, in which case userspace is responsible for
+        * handling wake events.
+        */
        ++vcpu->stat.halt_exits;
        if (lapic_in_kernel(vcpu)) {
                vcpu->arch.mp_state = state;

@@ -9892,7 +9899,7 @@ static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
        if (!kvm_arch_vcpu_runnable(vcpu) &&
            (!kvm_x86_ops.pre_block || static_call(kvm_x86_pre_block)(vcpu) == 0)) {
                srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
-               kvm_vcpu_block(vcpu);
+               kvm_vcpu_halt(vcpu);
                vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);

                if (kvm_x86_ops.post_block)

@@ -10126,7 +10133,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
                        r = -EINTR;
                        goto out;
                }
-               kvm_vcpu_block(vcpu);
+               kvm_vcpu_halt(vcpu);
                if (kvm_apic_accept_events(vcpu) < 0) {
                        r = 0;
                        goto out;

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1ced2914d9ca..c2ea4004553a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h

@@ -967,7 +967,7 @@ void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
 void kvm_sigset_activate(struct kvm_vcpu *vcpu);
 void kvm_sigset_deactivate(struct kvm_vcpu *vcpu);

-void kvm_vcpu_block(struct kvm_vcpu *vcpu);
+void kvm_vcpu_halt(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 227f6bbe0716..c13bf3367fda 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c

@@ -3223,17 +3223,14 @@ static inline void update_halt_poll_stats(struct kvm_vcpu *vcpu, ktime_t start,
        }
 }

-/*
- * The vCPU has executed a HLT instruction with in-kernel mode enabled.
- */
-void kvm_vcpu_block(struct kvm_vcpu *vcpu)
+void kvm_vcpu_halt(struct kvm_vcpu *vcpu)
 {
        struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
        bool halt_poll_allowed = !kvm_arch_no_poll(vcpu);
        bool do_halt_poll = halt_poll_allowed && vcpu->halt_poll_ns;
        ktime_t start, cur, poll_end;
        bool waited = false;
-       u64 block_ns;
+       u64 halt_ns;

        start = cur = poll_end = ktime_get();
        if (do_halt_poll) {

@@ -3275,7 +3272,8 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
                                ktime_to_ns(cur) - ktime_to_ns(poll_end));
        }
 out:
-       block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
+       /* The total time the vCPU was "halted", including polling time. */
+       halt_ns = ktime_to_ns(cur) - ktime_to_ns(start);

        /*
         * Note, halt-polling is considered successful so long as the vCPU was

@@ -3289,24 +3287,24 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
                if (!vcpu_valid_wakeup(vcpu)) {
                        shrink_halt_poll_ns(vcpu);
                } else if (vcpu->kvm->max_halt_poll_ns) {
-                       if (block_ns <= vcpu->halt_poll_ns)
+                       if (halt_ns <= vcpu->halt_poll_ns)
                                ;
                        /* we had a long block, shrink polling */
                        else if (vcpu->halt_poll_ns &&
-                                       block_ns > vcpu->kvm->max_halt_poll_ns)
+                                halt_ns > vcpu->kvm->max_halt_poll_ns)
                                shrink_halt_poll_ns(vcpu);
                        /* we had a short halt and our poll time is too small */
                        else if (vcpu->halt_poll_ns < vcpu->kvm->max_halt_poll_ns &&
-                                       block_ns < vcpu->kvm->max_halt_poll_ns)
+                                halt_ns < vcpu->kvm->max_halt_poll_ns)
                                grow_halt_poll_ns(vcpu);
                } else {
                        vcpu->halt_poll_ns = 0;
                }
        }

-       trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
+       trace_kvm_vcpu_wakeup(halt_ns, waited, vcpu_valid_wakeup(vcpu));
 }
-EXPORT_SYMBOL_GPL(kvm_vcpu_block);
+EXPORT_SYMBOL_GPL(kvm_vcpu_halt);

 bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
 {
--

2.33.0.882.g93a45727a2-goog

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