Date: Tue, 18 Nov 2025 15:02:50 +0000 From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 869faf4c4823 - stable/15 - amd64/vmm: Factor vcpu_notify_event() into two functions Message-ID: <691c8a9a.38125.4dd1dc60@gitrepo.freebsd.org>
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The branch stable/15 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=869faf4c4823c78240724ad326df1968f8cb15a9 commit 869faf4c4823c78240724ad326df1968f8cb15a9 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2025-11-04 13:52:21 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2025-11-18 14:57:31 +0000 amd64/vmm: Factor vcpu_notify_event() into two functions vcpu_notify_event() previously took a boolean parameter which determines whether the implementation should try to use a posted interrupt. On arm64 and riscv, the implementation of vcpu_notify_event() is otherwise identical to that of amd64. With the aim of deduplicating vcpu state management code, introduce a separate amd64-only function which tries to use posted interrupts. This requires some duplication with vcpu_notify_event_locked(), but only a little bit. Then, fix up callers. No functional change intended. Reviewed by: corvink, jhb MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D53419 (cherry picked from commit 78a3a1e78ad8812bcf82e30b52ba2f21c49a3407) --- sys/amd64/include/vmm.h | 3 ++- sys/amd64/vmm/io/vlapic.c | 2 +- sys/amd64/vmm/vmm.c | 42 ++++++++++++++++++++++++------------------ sys/amd64/vmm/vmm_lapic.c | 2 +- 4 files changed, 28 insertions(+), 21 deletions(-) diff --git a/sys/amd64/include/vmm.h b/sys/amd64/include/vmm.h index ad67510fecf3..c7baa5e4c54a 100644 --- a/sys/amd64/include/vmm.h +++ b/sys/amd64/include/vmm.h @@ -383,7 +383,8 @@ vcpu_should_yield(struct vcpu *vcpu) #endif void *vcpu_stats(struct vcpu *vcpu); -void vcpu_notify_event(struct vcpu *vcpu, bool lapic_intr); +void vcpu_notify_event(struct vcpu *vcpu); +void vcpu_notify_lapic(struct vcpu *vcpu); struct vm_mem *vm_mem(struct vm *vm); struct vatpic *vm_atpic(struct vm *vm); struct vatpit *vm_atpit(struct vm *vm); diff --git a/sys/amd64/vmm/io/vlapic.c b/sys/amd64/vmm/io/vlapic.c index 9879dfa164a4..afd5045de574 100644 --- a/sys/amd64/vmm/io/vlapic.c +++ b/sys/amd64/vmm/io/vlapic.c @@ -456,7 +456,7 @@ vlapic_fire_lvt(struct vlapic *vlapic, u_int lvt) return (0); } if (vlapic_set_intr_ready(vlapic, vec, false)) - vcpu_notify_event(vlapic->vcpu, true); + vcpu_notify_lapic(vlapic->vcpu); break; case APIC_LVT_DM_NMI: vm_inject_nmi(vlapic->vcpu); diff --git a/sys/amd64/vmm/vmm.c b/sys/amd64/vmm/vmm.c index 473887240b9b..92d1b310f6ea 100644 --- a/sys/amd64/vmm/vmm.c +++ b/sys/amd64/vmm/vmm.c @@ -274,7 +274,7 @@ u_int vm_maxcpu; SYSCTL_UINT(_hw_vmm, OID_AUTO, maxcpu, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &vm_maxcpu, 0, "Maximum number of vCPUs"); -static void vcpu_notify_event_locked(struct vcpu *vcpu, bool lapic_intr); +static void vcpu_notify_event_locked(struct vcpu *vcpu); /* global statistics */ VMM_STAT(VCPU_MIGRATIONS, "vcpu migration across host cpus"); @@ -1033,7 +1033,7 @@ vcpu_wait_idle(struct vcpu *vcpu) KASSERT(vcpu->state != VCPU_IDLE, ("vcpu already idle")); vcpu->reqidle = 1; - vcpu_notify_event_locked(vcpu, false); + vcpu_notify_event_locked(vcpu); VMM_CTR1(vcpu, "vcpu state change from %s to " "idle requested", vcpu_state2str(vcpu->state)); msleep_spin(&vcpu->state, &vcpu->mtx, "vmstat", hz); @@ -1514,7 +1514,7 @@ vm_handle_suspend(struct vcpu *vcpu, bool *retu) */ for (i = 0; i < vm->maxcpus; i++) { if (CPU_ISSET(i, &vm->suspended_cpus)) { - vcpu_notify_event(vm_vcpu(vm, i), false); + vcpu_notify_event(vm_vcpu(vm, i)); } } @@ -1588,7 +1588,7 @@ vm_suspend(struct vm *vm, enum vm_suspend_how how) */ for (i = 0; i < vm->maxcpus; i++) { if (CPU_ISSET(i, &vm->active_cpus)) - vcpu_notify_event(vm_vcpu(vm, i), false); + vcpu_notify_event(vm_vcpu(vm, i)); } return (0); @@ -2068,7 +2068,7 @@ vm_inject_nmi(struct vcpu *vcpu) { vcpu->nmi_pending = 1; - vcpu_notify_event(vcpu, false); + vcpu_notify_event(vcpu); return (0); } @@ -2095,7 +2095,7 @@ vm_inject_extint(struct vcpu *vcpu) { vcpu->extint_pending = 1; - vcpu_notify_event(vcpu, false); + vcpu_notify_event(vcpu); return (0); } @@ -2266,14 +2266,14 @@ vm_suspend_cpu(struct vm *vm, struct vcpu *vcpu) vm->debug_cpus = vm->active_cpus; for (int i = 0; i < vm->maxcpus; i++) { if (CPU_ISSET(i, &vm->active_cpus)) - vcpu_notify_event(vm_vcpu(vm, i), false); + vcpu_notify_event(vm_vcpu(vm, i)); } } else { if (!CPU_ISSET(vcpu->vcpuid, &vm->active_cpus)) return (EINVAL); CPU_SET_ATOMIC(vcpu->vcpuid, &vm->debug_cpus); - vcpu_notify_event(vcpu, false); + vcpu_notify_event(vcpu); } return (0); } @@ -2381,7 +2381,7 @@ vm_set_x2apic_state(struct vcpu *vcpu, enum x2apic_state state) * to the host_cpu to cause the vcpu to trap into the hypervisor. */ static void -vcpu_notify_event_locked(struct vcpu *vcpu, bool lapic_intr) +vcpu_notify_event_locked(struct vcpu *vcpu) { int hostcpu; @@ -2389,12 +2389,7 @@ vcpu_notify_event_locked(struct vcpu *vcpu, bool lapic_intr) if (vcpu->state == VCPU_RUNNING) { KASSERT(hostcpu != NOCPU, ("vcpu running on invalid hostcpu")); if (hostcpu != curcpu) { - if (lapic_intr) { - vlapic_post_intr(vcpu->vlapic, hostcpu, - vmm_ipinum); - } else { - ipi_cpu(hostcpu, vmm_ipinum); - } + ipi_cpu(hostcpu, vmm_ipinum); } else { /* * If the 'vcpu' is running on 'curcpu' then it must @@ -2412,10 +2407,21 @@ vcpu_notify_event_locked(struct vcpu *vcpu, bool lapic_intr) } void -vcpu_notify_event(struct vcpu *vcpu, bool lapic_intr) +vcpu_notify_event(struct vcpu *vcpu) +{ + vcpu_lock(vcpu); + vcpu_notify_event_locked(vcpu); + vcpu_unlock(vcpu); +} + +void +vcpu_notify_lapic(struct vcpu *vcpu) { vcpu_lock(vcpu); - vcpu_notify_event_locked(vcpu, lapic_intr); + if (vcpu->state == VCPU_RUNNING && vcpu->hostcpu != curcpu) + vlapic_post_intr(vcpu->vlapic, vcpu->hostcpu, vmm_ipinum); + else + vcpu_notify_event_locked(vcpu); vcpu_unlock(vcpu); } @@ -2477,7 +2483,7 @@ restart: */ for (i = 0; i < vm->maxcpus; i++) { if (CPU_ISSET(i, &dest)) - vcpu_notify_event(vm_vcpu(vm, i), false); + vcpu_notify_event(vm_vcpu(vm, i)); } return (vm_handle_rendezvous(vcpu)); diff --git a/sys/amd64/vmm/vmm_lapic.c b/sys/amd64/vmm/vmm_lapic.c index 0cae01f172ec..63bdee69bb59 100644 --- a/sys/amd64/vmm/vmm_lapic.c +++ b/sys/amd64/vmm/vmm_lapic.c @@ -61,7 +61,7 @@ lapic_set_intr(struct vcpu *vcpu, int vector, bool level) vlapic = vm_lapic(vcpu); if (vlapic_set_intr_ready(vlapic, vector, level)) - vcpu_notify_event(vcpu, true); + vcpu_notify_lapic(vcpu); return (0); }help
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