[PATCH 1/2] KVM: x86: Plumb in the vCPU to kvm_x86_ops.hwapic_isr_update()

Sean Christopherson
2024-11-01T19:21:17Z

Pass the target vCPU to the hwapic_isr_update() vendor hook so that VMX
can defer the update until after nested VM-Exit if an EOI for L1's vAPIC
occurs while L2 is active.

No functional change intended.

Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/lapic.c | 11 +++++------
arch/x86/kvm/vmx/vmx.c | 2 +-
arch/x86/kvm/vmx/x86_ops.h | 2 +-
4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 70c7ed0ef184..3f3de047cbfd 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1734,7 +1734,7 @@ struct kvm_x86_ops {
bool allow_apicv_in_x2apic_without_x2apic_virtualization;
void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
- void (*hwapic_isr_update)(int isr);
+ void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 65412640cfc7..5be2be44a188 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -763,7 +763,7 @@ static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
* just set SVI.
*/
if (unlikely(apic->apicv_active))
- kvm_x86_call(hwapic_isr_update)(vec);
+ kvm_x86_call(hwapic_isr_update)(apic->vcpu, vec);
else {
++apic->isr_count;
BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
@@ -808,7 +808,7 @@ static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
* and must be left alone.
*/
if (unlikely(apic->apicv_active))
- kvm_x86_call(hwapic_isr_update)(apic_find_highest_isr(apic));
+ kvm_x86_call(hwapic_isr_update)(apic->vcpu, apic_find_highest_isr(apic));
else {
--apic->isr_count;
BUG_ON(apic->isr_count < 0);
@@ -2767,7 +2767,7 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
if (apic->apicv_active) {
kvm_x86_call(apicv_post_state_restore)(vcpu);
kvm_x86_call(hwapic_irr_update)(vcpu, -1);
- kvm_x86_call(hwapic_isr_update)(-1);
+ kvm_x86_call(hwapic_isr_update)(vcpu, -1);
}

vcpu->arch.apic_arb_prio = 0;
@@ -3083,9 +3083,8 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
kvm_apic_update_apicv(vcpu);
if (apic->apicv_active) {
kvm_x86_call(apicv_post_state_restore)(vcpu);
- kvm_x86_call(hwapic_irr_update)(vcpu,
- apic_find_highest_irr(apic));
- kvm_x86_call(hwapic_isr_update)(apic_find_highest_isr(apic));
+ kvm_x86_call(hwapic_irr_update)(vcpu, apic_find_highest_irr(apic));
+ kvm_x86_call(hwapic_isr_update)(vcpu, apic_find_highest_isr(apic));
}
kvm_make_request(KVM_REQ_EVENT, vcpu);
if (ioapic_in_kernel(vcpu->kvm))
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 6ed801ffe33f..fe9887a5fa4a 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6868,7 +6868,7 @@ void vmx_set_apic_access_page_addr(struct kvm_vcpu *vcpu)
read_unlock(&vcpu->kvm->mmu_lock);
}

-void vmx_hwapic_isr_update(int max_isr)
+void vmx_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
{
u16 status;
u8 old;
diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h
index a55981c5216e..48dc76bf0ec0 100644
--- a/arch/x86/kvm/vmx/x86_ops.h
+++ b/arch/x86/kvm/vmx/x86_ops.h
@@ -48,7 +48,7 @@ void vmx_migrate_timers(struct kvm_vcpu *vcpu);
void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
void vmx_apicv_pre_state_restore(struct kvm_vcpu *vcpu);
void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr);
-void vmx_hwapic_isr_update(int max_isr);
+void vmx_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr);
int vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu);
void vmx_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode,
int trig_mode, int vector);
--
2.47.0.163.g1226f6d8fa-goog