[PATCH v2 3/5] KVM: x86: Move kvm_intr_is_single_vcpu() to lapic.c

Sean Christopherson
2025-09-19T00:33:20Z

Move kvm_intr_is_single_vcpu() to lapic.c, drop its export, and make its
"fast" helper local to lapic.c. kvm_intr_is_single_vcpu() is only usable
if the local APIC is in-kernel, i.e. it most definitely belongs in the
local APIC code.

No functional change intended.

Fixes: 2f5fb6b965b3 ("KVM: x86: Dedup AVIC vs. PI code for identifying target vCPU")
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/include/asm/kvm_host.h | 3 ---
arch/x86/kvm/irq.c | 28 ----------------------------
arch/x86/kvm/lapic.c | 33 +++++++++++++++++++++++++++++++--
arch/x86/kvm/lapic.h | 4 ++--
4 files changed, 33 insertions(+), 35 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 17772513b9cc..00a210130fba 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2412,9 +2412,6 @@ void __user *__x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa,
bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu);
bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu);

-bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
- struct kvm_vcpu **dest_vcpu);
-
static inline bool kvm_irq_is_postable(struct kvm_lapic_irq *irq)
{
/* We can only post Fixed and LowPrio IRQs */
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index a6b122f732be..153134893301 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -354,34 +354,6 @@ int kvm_set_routing_entry(struct kvm *kvm,
return 0;
}

-bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
- struct kvm_vcpu **dest_vcpu)
-{
- int r = 0;
- unsigned long i;
- struct kvm_vcpu *vcpu;
-
- if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
- return true;
-
- kvm_for_each_vcpu(i, vcpu, kvm) {
- if (!kvm_apic_present(vcpu))
- continue;
-
- if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
- irq->dest_id, irq->dest_mode))
- continue;
-
- if (++r == 2)
- return false;
-
- *dest_vcpu = vcpu;
- }
-
- return r == 1;
-}
-EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu);
-
void kvm_scan_ioapic_irq(struct kvm_vcpu *vcpu, u32 dest_id, u16 dest_mode,
u8 vector, unsigned long *ioapic_handled_vectors)
{
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 3b76192b24e9..b5e47c523164 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1237,8 +1237,9 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src,
* interrupt.
* - Otherwise, use remapped mode to inject the interrupt.
*/
-bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
- struct kvm_vcpu **dest_vcpu)
+static bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm,
+ struct kvm_lapic_irq *irq,
+ struct kvm_vcpu **dest_vcpu)
{
struct kvm_apic_map *map;
unsigned long bitmap;
@@ -1265,6 +1266,34 @@ bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
return ret;
}

+bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
+ struct kvm_vcpu **dest_vcpu)
+{
+ int r = 0;
+ unsigned long i;
+ struct kvm_vcpu *vcpu;
+
+ if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu))
+ return true;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (!kvm_apic_present(vcpu))
+ continue;
+
+ if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand,
+ irq->dest_id, irq->dest_mode))
+ continue;
+
+ if (++r == 2)
+ return false;
+
+ *dest_vcpu = vcpu;
+ }
+
+ return r == 1;
+}
+EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu);
+
int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
struct kvm_lapic_irq *irq, struct dest_map *dest_map)
{
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 50123fe7f58f..282b9b7da98c 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -236,8 +236,8 @@ void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu);
void kvm_bitmap_or_dest_vcpus(struct kvm *kvm, struct kvm_lapic_irq *irq,
unsigned long *vcpu_bitmap);

-bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
- struct kvm_vcpu **dest_vcpu);
+bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
+ struct kvm_vcpu **dest_vcpu);
void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu *vcpu);
void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu *vcpu);
void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu);
--
2.51.0.470.ga7dc726c21-goog