arch/x86/kvm/ioapic.c

Source file repositories/reference/linux-study-clean/arch/x86/kvm/ioapic.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kvm/ioapic.c
Extension
.c
Size
21404 bytes
Lines
780
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (redir_index < IOAPIC_NUM_PINS) {
				u32 index = array_index_nospec(
					redir_index, IOAPIC_NUM_PINS);

				redir_content = ioapic->redirtbl[index].bits;
			}

			result = (ioapic->ioregsel & 0x1) ?
			    (redir_content >> 32) & 0xffffffff :
			    redir_content & 0xffffffff;
			break;
		}
	}

	return result;
}

static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)
{
	ioapic->rtc_status.pending_eoi = 0;
	bitmap_zero(ioapic->rtc_status.map, KVM_MAX_VCPU_IDS);
}

static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);

static void rtc_status_pending_eoi_check_valid(struct kvm_ioapic *ioapic)
{
	if (WARN_ON(ioapic->rtc_status.pending_eoi < 0))
		kvm_rtc_eoi_tracking_restore_all(ioapic);
}

static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
{
	bool new_val, old_val;
	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
	struct rtc_status *status = &ioapic->rtc_status;
	union kvm_ioapic_redirect_entry *e;

	e = &ioapic->redirtbl[RTC_GSI];
	if (!kvm_apic_match_dest(vcpu, NULL, APIC_DEST_NOSHORT,
				 e->fields.dest_id,
				 kvm_lapic_irq_dest_mode(!!e->fields.dest_mode)))
		return;

	new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
	old_val = test_bit(vcpu->vcpu_id, status->map);

	if (new_val == old_val)
		return;

	if (new_val) {
		__set_bit(vcpu->vcpu_id, status->map);
		status->vectors[vcpu->vcpu_id] = e->fields.vector;
		ioapic->rtc_status.pending_eoi++;
	} else {
		__clear_bit(vcpu->vcpu_id, status->map);
		ioapic->rtc_status.pending_eoi--;
		rtc_status_pending_eoi_check_valid(ioapic);
	}
}

void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
{
	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;

	spin_lock(&ioapic->lock);
	__rtc_irq_eoi_tracking_restore_one(vcpu);
	spin_unlock(&ioapic->lock);
}

static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
{
	struct kvm_vcpu *vcpu;
	unsigned long i;

	if (RTC_GSI >= IOAPIC_NUM_PINS)
		return;

	rtc_irq_eoi_tracking_reset(ioapic);
	kvm_for_each_vcpu(i, vcpu, ioapic->kvm)
	    __rtc_irq_eoi_tracking_restore_one(vcpu);
}

static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu,
			int vector)
{
	struct rtc_status *status = &ioapic->rtc_status;

	/* RTC special handling */
	if (test_bit(vcpu->vcpu_id, status->map) &&

Annotation

Implementation Notes