From: Yang Zhang <yang.z.zhang@xxxxxxxxx>
Virtual interrupt delivery avoids KVM to inject vAPIC interrupts
manually, which is fully taken care of by the hardware. This needs
some special awareness into existing interrupr injection path:
- for pending interrupt, instead of direct injection, we may need
update architecture specific indicators before resuming to guest.
- A pending interrupt, which is masked by ISR, should be also
considered in above update action, since hardware will decide
when to inject it at right time. Current has_interrupt and
get_interrupt only returns a valid vector from injection p.o.v.
Signed-off-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
arch/ia64/kvm/lapic.h | 6 ++
arch/x86/include/asm/kvm_host.h | 5 ++
arch/x86/include/asm/vmx.h | 11 ++++
arch/x86/kvm/irq.c | 56 +++++++++++++++++--
arch/x86/kvm/lapic.c | 106 +++++++++++++++++++++++++++--------
arch/x86/kvm/lapic.h | 27 +++++++++
arch/x86/kvm/svm.c | 18 ++++++
arch/x86/kvm/vmx.c | 119 +++++++++++++++++++++++++++++++++++---
arch/x86/kvm/x86.c | 23 +++++++-
include/linux/kvm_host.h | 3 +
virt/kvm/ioapic.c | 39 +++++++++++++
virt/kvm/ioapic.h | 4 +
virt/kvm/irq_comm.c | 25 ++++++++
virt/kvm/kvm_main.c | 5 ++
14 files changed, 407 insertions(+), 40 deletions(-)
diff --git a/arch/ia64/kvm/lapic.h b/arch/ia64/kvm/lapic.h
index c5f92a9..c3e2935 100644
--- a/arch/ia64/kvm/lapic.h
+++ b/arch/ia64/kvm/lapic.h
@@ -27,4 +27,10 @@ int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq);
#define kvm_apic_present(x) (true)
#define kvm_lapic_enabled(x) (true)
+static inline bool kvm_apic_vid_enabled(void)
+{
+ /* IA64 has no apicv supporting, do nothing here */
+ return false;
+}
+
#endif
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e1306c1..ffface5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -692,6 +692,10 @@ struct kvm_x86_ops {
void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
void (*enable_irq_window)(struct kvm_vcpu *vcpu);
void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
+ int (*vm_has_apicv)(struct kvm *kvm);
+ void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
+ void (*hwapic_isr_update)(struct kvm *kvm, int isr);
+ void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set);
int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
int (*get_tdp_level)(void);
@@ -987,6 +991,7 @@ int kvm_age_hva(struct kvm *kvm, unsigned long hva);
int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
+int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 0a54df0..694586c 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -62,6 +62,7 @@
#define EXIT_REASON_MCE_DURING_VMENTRY 41
#define EXIT_REASON_TPR_BELOW_THRESHOLD 43
#define EXIT_REASON_APIC_ACCESS 44
+#define EXIT_REASON_EOI_INDUCED 45
#define EXIT_REASON_EPT_VIOLATION 48
#define EXIT_REASON_EPT_MISCONFIG 49
#define EXIT_REASON_WBINVD 54
@@ -144,6 +145,7 @@
#define SECONDARY_EXEC_WBINVD_EXITING 0x00000040
#define SECONDARY_EXEC_UNRESTRICTED_GUEST 0x00000080
#define SECONDARY_EXEC_APIC_REGISTER_VIRT 0x00000100
+#define SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY 0x00000200
#define SECONDARY_EXEC_PAUSE_LOOP_EXITING 0x00000400
#define SECONDARY_EXEC_ENABLE_INVPCID 0x00001000
@@ -181,6 +183,7 @@ enum vmcs_field {
GUEST_GS_SELECTOR = 0x0000080a,
GUEST_LDTR_SELECTOR = 0x0000080c,
GUEST_TR_SELECTOR = 0x0000080e,
+ GUEST_INTR_STATUS = 0x00000810,
HOST_ES_SELECTOR = 0x00000c00,
HOST_CS_SELECTOR = 0x00000c02,
HOST_SS_SELECTOR = 0x00000c04,
@@ -208,6 +211,14 @@ enum vmcs_field {
APIC_ACCESS_ADDR_HIGH = 0x00002015,
EPT_POINTER = 0x0000201a,
EPT_POINTER_HIGH = 0x0000201b,
+ EOI_EXIT_BITMAP0 = 0x0000201c,
+ EOI_EXIT_BITMAP0_HIGH = 0x0000201d,
+ EOI_EXIT_BITMAP1 = 0x0000201e,
+ EOI_EXIT_BITMAP1_HIGH = 0x0000201f,
+ EOI_EXIT_BITMAP2 = 0x00002020,
+ EOI_EXIT_BITMAP2_HIGH = 0x00002021,
+ EOI_EXIT_BITMAP3 = 0x00002022,
+ EOI_EXIT_BITMAP3_HIGH = 0x00002023,
GUEST_PHYSICAL_ADDRESS = 0x00002400,
GUEST_PHYSICAL_ADDRESS_HIGH = 0x00002401,
VMCS_LINK_POINTER = 0x00002800,
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index b111aee..484bc87 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -38,6 +38,38 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
EXPORT_SYMBOL(kvm_cpu_has_pending_timer);
/*
+ * check if there is pending interrupt from
+ * non-APIC source without intack.
+ */
+static int kvm_cpu_has_extint(struct kvm_vcpu *v)
+{
+ if (kvm_apic_accept_pic_intr(v))
+ return pic_irqchip(v->kvm)->output; /* PIC */
+ else
+ return 0;
+}
+
+/*
+ * check if there is injectable interrupt:
+ * when virtual interrupt delivery enabled,
+ * interrupt from apic will handled by hardware,
+ * we don't need to check it here.
+ */
+int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v)
+{
+ if (!irqchip_in_kernel(v->kvm))
+ return v->arch.interrupt.pending;
+
+ if (kvm_cpu_has_extint(v))
+ return 1;
+
+ if (kvm_apic_vid_enabled(v->kvm))
+ return 0;
+
+ return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
+}
+
+/*
* check if there is pending interrupt without
* intack.
*/
@@ -46,27 +78,41 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
if (!irqchip_in_kernel(v->kvm))
return v->arch.interrupt.pending;
- if (kvm_apic_accept_pic_intr(v) && pic_irqchip(v->kvm)->output)
- return pic_irqchip(v->kvm)->output; /* PIC */
+ if (kvm_cpu_has_extint(v))
+ return 1;
return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
}
EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
/*
+ * Read pending interrupt(from non-APIC source)
+ * vector and intack.
+ */
+static int kvm_cpu_get_extint(struct kvm_vcpu *v)
+{
+ if (kvm_cpu_has_extint(v))
+ return kvm_pic_read_irq(v->kvm); /* PIC */
+ return -1;
+}
+
+/*
* Read pending interrupt vector and intack.
*/
int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
{
+ int vector;
+
if (!irqchip_in_kernel(v->kvm))
return v->arch.interrupt.nr;
- if (kvm_apic_accept_pic_intr(v) && pic_irqchip(v->kvm)->output)
- return kvm_pic_read_irq(v->kvm); /* PIC */
+ vector = kvm_cpu_get_extint(v);
+
+ if (kvm_apic_vid_enabled(v->kvm) || vector != -1)
+ return vector; /* PIC */
return kvm_get_apic_interrupt(v); /* APIC */
}
-EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
{
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index f69fc50..02b51dd 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -145,21 +145,51 @@ static inline int kvm_apic_id(struct kvm_lapic *apic)
return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
}
-static inline u16 apic_cluster_id(struct kvm_apic_map *map, u32 ldr)
+void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
+ struct kvm_lapic_irq *irq,
+ u64 *eoi_exit_bitmap)
{
- u16 cid;
- ldr >>= 32 - map->ldr_bits;
- cid = (ldr >> map->cid_shift) & map->cid_mask;
+ struct kvm_lapic **dst;
+ struct kvm_apic_map *map;
+ unsigned long bitmap = 1;
+ int i;
- BUG_ON(cid >= ARRAY_SIZE(map->logical_map));
+ rcu_read_lock();
+ map = rcu_dereference(vcpu->kvm->arch.apic_map);
- return cid;
-}
+ if (unlikely(!map)) {
+ __set_bit(irq->vector, (unsigned long *)eoi_exit_bitmap);
+ goto out;
+ }
-static inline u16 apic_logical_id(struct kvm_apic_map *map, u32 ldr)
-{
- ldr >>= (32 - map->ldr_bits);
- return ldr & map->lid_mask;
+ if (irq->dest_mode == 0) { /* physical mode */
+ if (irq->delivery_mode == APIC_DM_LOWEST ||
+ irq->dest_id == 0xff) {
+ __set_bit(irq->vector,
+ (unsigned long *)eoi_exit_bitmap);
+ goto out;
+ }
+ dst = &map->phys_map[irq->dest_id & 0xff];
+ } else {
+ u32 mda = irq->dest_id << (32 - map->ldr_bits);
+
+ dst = map->logical_map[apic_cluster_id(map, mda)];
+
+ bitmap = apic_logical_id(map, mda);
+ }
+
+ for_each_set_bit(i, &bitmap, 16) {
+ if (!dst[i])
+ continue;
+ if (dst[i]->vcpu == vcpu) {
+ __set_bit(irq->vector,
+ (unsigned long *)eoi_exit_bitmap);
+ break;
+ }
+ }
+
+out:
+ rcu_read_unlock();
}
static void recalculate_apic_map(struct kvm *kvm)
@@ -225,6 +255,8 @@ out:
if (old)
kfree_rcu(old, rcu);
+
+ kvm_ioapic_make_eoibitmap_request(kvm);
}
static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
@@ -340,6 +372,10 @@ static inline int apic_find_highest_irr(struct kvm_lapic *apic)
{
int result;
+ /*
+ * Note that irr_pending is just a hint. It will be always
+ * true with virtual interrupt delivery enabled.
+ */
if (!apic->irr_pending)
return -1;
@@ -456,6 +492,8 @@ static void pv_eoi_clr_pending(struct kvm_vcpu *vcpu)
static inline int apic_find_highest_isr(struct kvm_lapic *apic)
{
int result;
+
+ /* Note that isr_count is always 1 with vid enabled */
if (!apic->isr_count)
return -1;
if (likely(apic->highest_isr_cache != -1))
@@ -735,6 +773,19 @@ int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
}
+static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
+{
+ if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) &&
+ kvm_ioapic_handles_vector(apic->vcpu->kvm, vector)) {
+ int trigger_mode;
+ if (apic_test_vector(vector, apic->regs + APIC_TMR))
+ trigger_mode = IOAPIC_LEVEL_TRIG;
+ else
+ trigger_mode = IOAPIC_EDGE_TRIG;
+ kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
+ }
+}
+
static int apic_set_eoi(struct kvm_lapic *apic)
{
int vector = apic_find_highest_isr(apic);
@@ -751,19 +802,26 @@ static int apic_set_eoi(struct kvm_lapic *apic)
apic_clear_isr(vector, apic);
apic_update_ppr(apic);
- if (!(kvm_apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI) &&
- kvm_ioapic_handles_vector(apic->vcpu->kvm, vector)) {
- int trigger_mode;
- if (apic_test_vector(vector, apic->regs + APIC_TMR))
- trigger_mode = IOAPIC_LEVEL_TRIG;
- else
- trigger_mode = IOAPIC_EDGE_TRIG;
- kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
- }
+ kvm_ioapic_send_eoi(apic, vector);
kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
return vector;
}
+/*
+ * this interface assumes a trap-like exit, which has already finished
+ * desired side effect including vISR and vPPR update.
+ */
+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
+{
+ struct kvm_lapic *apic = vcpu->arch.apic;
+
+ trace_kvm_eoi(apic, vector);
+
+ kvm_ioapic_send_eoi(apic, vector);
+ kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_apic_set_eoi_accelerated);
+
static void apic_send_ipi(struct kvm_lapic *apic)
{
u32 icr_low = kvm_apic_get_reg(apic, APIC_ICR);
@@ -1375,8 +1433,8 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu)
apic_set_reg(apic, APIC_ISR + 0x10 * i, 0);
apic_set_reg(apic, APIC_TMR + 0x10 * i, 0);
}
- apic->irr_pending = false;
- apic->isr_count = 0;
+ apic->irr_pending = kvm_apic_vid_enabled(vcpu->kvm);
+ apic->isr_count = kvm_apic_vid_enabled(vcpu->kvm);
apic->highest_isr_cache = -1;
update_divide_count(apic);
atomic_set(&apic->lapic_timer.pending, 0);
@@ -1591,8 +1649,10 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
update_divide_count(apic);
start_apic_timer(apic);
apic->irr_pending = true;
- apic->isr_count = count_vectors(apic->regs + APIC_ISR);
+ apic->isr_count = kvm_apic_vid_enabled(vcpu->kvm) ?
+ 1 : count_vectors(apic->regs + APIC_ISR);
apic->highest_isr_cache = -1;
+ kvm_x86_ops->hwapic_isr_update(vcpu->kvm, apic_find_highest_isr(apic));
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 22a5397..1676d34 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -65,6 +65,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);
void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data);
void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);
+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector);
void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);
void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu);
@@ -131,4 +132,30 @@ static inline int apic_x2apic_mode(struct kvm_lapic *apic)
return apic->vcpu->arch.apic_base & X2APIC_ENABLE;
}
+static inline bool kvm_apic_vid_enabled(struct kvm *kvm)
+{
+ return kvm_x86_ops->vm_has_apicv(kvm);
+}
+
+static inline u16 apic_cluster_id(struct kvm_apic_map *map, u32 ldr)
+{
+ u16 cid;
+ ldr >>= 32 - map->ldr_bits;
+ cid = (ldr >> map->cid_shift) & map->cid_mask;
+
+ BUG_ON(cid >= ARRAY_SIZE(map->logical_map));
+
+ return cid;
+}
+
+static inline u16 apic_logical_id(struct kvm_apic_map *map, u32 ldr)
+{
+ ldr >>= (32 - map->ldr_bits);
+ return ldr & map->lid_mask;
+}
+
+void kvm_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
+ struct kvm_lapic_irq *irq,
+ u64 *eoi_bitmap);
+
#endif
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 38407e9..e1b1ce2 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3576,6 +3576,21 @@ static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
return;
}
+static int svm_vm_has_apicv(struct kvm *kvm)
+{
+ return 0;
+}
+
+static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
+{
+ return;
+}
+
+static void svm_hwapic_isr_update(struct kvm *kvm, int isr)
+{
+ return;
+}
+
static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -4296,6 +4311,9 @@ static struct kvm_x86_ops svm_x86_ops = {
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
.set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode,
+ .vm_has_apicv = svm_vm_has_apicv,
+ .load_eoi_exitmap = svm_load_eoi_exitmap,
+ .hwapic_isr_update = svm_hwapic_isr_update,
.set_tss_addr = svm_set_tss_addr,
.get_tdp_level = get_npt_level,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7e71526..e7bede6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -84,8 +84,8 @@ module_param(vmm_exclusive, bool, S_IRUGO);
static bool __read_mostly fasteoi = 1;
module_param(fasteoi, bool, S_IRUGO);
-static bool __read_mostly enable_apicv_reg = 1;
-module_param(enable_apicv_reg, bool, S_IRUGO);
+static bool __read_mostly enable_apicv_reg_vid = 1;
+module_param(enable_apicv_reg_vid, bool, S_IRUGO);
/*
* If nested=1, nested virtualization is supported, i.e., guests may use
@@ -781,6 +781,12 @@ static inline bool cpu_has_vmx_apic_register_virt(void)
SECONDARY_EXEC_APIC_REGISTER_VIRT;
}
+static inline bool cpu_has_vmx_virtual_intr_delivery(void)
+{
+ return vmcs_config.cpu_based_2nd_exec_ctrl &
+ SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY;
+}
+
static inline bool cpu_has_vmx_flexpriority(void)
{
return cpu_has_vmx_tpr_shadow() &&
@@ -2570,7 +2576,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
SECONDARY_EXEC_PAUSE_LOOP_EXITING |
SECONDARY_EXEC_RDTSCP |
SECONDARY_EXEC_ENABLE_INVPCID |
- SECONDARY_EXEC_APIC_REGISTER_VIRT;
+ SECONDARY_EXEC_APIC_REGISTER_VIRT |
+ SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY;
if (adjust_vmx_controls(min2, opt2,
MSR_IA32_VMX_PROCBASED_CTLS2,
&_cpu_based_2nd_exec_control) < 0)
@@ -2585,7 +2592,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
if (!(_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
_cpu_based_2nd_exec_control &= ~(
SECONDARY_EXEC_APIC_REGISTER_VIRT |
- SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE);
+ SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
+ SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
@@ -2784,8 +2792,14 @@ static __init int hardware_setup(void)
if (!cpu_has_vmx_ple())
ple_gap = 0;
- if (!cpu_has_vmx_apic_register_virt())
- enable_apicv_reg = 0;
+ if (!cpu_has_vmx_apic_register_virt() ||
+ !cpu_has_vmx_virtual_intr_delivery())
+ enable_apicv_reg_vid = 0;
+
+ if (enable_apicv_reg_vid)
+ kvm_x86_ops->update_cr8_intercept = NULL;
+ else
+ kvm_x86_ops->hwapic_irr_update = NULL;
if (nested)
nested_vmx_setup_ctls_msrs();
@@ -3926,6 +3940,11 @@ static u32 vmx_exec_control(struct vcpu_vmx *vmx)
return exec_control;
}
+static int vmx_vm_has_apicv(struct kvm *kvm)
+{
+ return enable_apicv_reg_vid && irqchip_in_kernel(kvm);
+}
+
static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
{
u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
@@ -3943,8 +3962,9 @@ static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
if (!ple_gap)
exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
- if (!enable_apicv_reg || !irqchip_in_kernel(vmx->vcpu.kvm))
- exec_control &= ~SECONDARY_EXEC_APIC_REGISTER_VIRT;
+ if (!vmx_vm_has_apicv(vmx->vcpu.kvm))
+ exec_control &= ~(SECONDARY_EXEC_APIC_REGISTER_VIRT |
+ SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
return exec_control;
}
@@ -3990,6 +4010,15 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
vmx_secondary_exec_control(vmx));
}
+ if (enable_apicv_reg_vid) {
+ vmcs_write64(EOI_EXIT_BITMAP0, 0);
+ vmcs_write64(EOI_EXIT_BITMAP1, 0);
+ vmcs_write64(EOI_EXIT_BITMAP2, 0);
+ vmcs_write64(EOI_EXIT_BITMAP3, 0);
+
+ vmcs_write16(GUEST_INTR_STATUS, 0);
+ }
+
if (ple_gap) {
vmcs_write32(PLE_GAP, ple_gap);
vmcs_write32(PLE_WINDOW, ple_window);
@@ -4907,6 +4936,16 @@ static int handle_apic_access(struct kvm_vcpu *vcpu)
return emulate_instruction(vcpu, 0) == EMULATE_DONE;
}
+static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)
+{
+ unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ int vector = exit_qualification & 0xff;
+
+ /* EOI-induced VM exit is trap-like and thus no need to adjust IP */
+ kvm_apic_set_eoi_accelerated(vcpu, vector);
+ return 1;
+}
+
static int handle_apic_write(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -5852,6 +5891,7 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
[EXIT_REASON_APIC_ACCESS] = handle_apic_access,
[EXIT_REASON_APIC_WRITE] = handle_apic_write,
+ [EXIT_REASON_EOI_INDUCED] = handle_apic_eoi_induced,
[EXIT_REASON_WBINVD] = handle_wbinvd,
[EXIT_REASON_XSETBV] = handle_xsetbv,
[EXIT_REASON_TASK_SWITCH] = handle_task_switch,
@@ -6209,7 +6249,8 @@ static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
* There is not point to enable virtualize x2apic without enable
* apicv
*/
- if (!cpu_has_vmx_virtualize_x2apic_mode() || !enable_apicv_reg)
+ if (!cpu_has_vmx_virtualize_x2apic_mode() ||
+ !vmx_vm_has_apicv(vcpu->kvm))
return;
if (!vm_need_tpr_shadow(vcpu->kvm))
@@ -6229,6 +6270,56 @@ static void vmx_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
vmx_set_msr_bitmap(vcpu);
}
+static void vmx_hwapic_isr_update(struct kvm *kvm, int isr)
+{
+ u16 status;
+ u8 old;
+
+ if (!vmx_vm_has_apicv(kvm))
+ return;
+
+ if (isr == -1)
+ isr = 0;
+
+ status = vmcs_read16(GUEST_INTR_STATUS);
+ old = status >> 8;
+ if (isr != old) {
+ status &= 0xff;
+ status |= isr << 8;
+ vmcs_write16(GUEST_INTR_STATUS, status);
+ }
+}
+
+static void vmx_set_rvi(int vector)
+{
+ u16 status;
+ u8 old;
+
+ status = vmcs_read16(GUEST_INTR_STATUS);
+ old = (u8)status & 0xff;
+ if ((u8)vector != old) {
+ status &= ~0xff;
+ status |= (u8)vector;
+ vmcs_write16(GUEST_INTR_STATUS, status);
+ }
+}
+
+static void vmx_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
+{
+ if (max_irr == -1)
+ return;
+
+ vmx_set_rvi(max_irr);
+}
+
+static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
+{
+ vmcs_write64(EOI_EXIT_BITMAP0, eoi_exit_bitmap[0]);
+ vmcs_write64(EOI_EXIT_BITMAP1, eoi_exit_bitmap[1]);
+ vmcs_write64(EOI_EXIT_BITMAP2, eoi_exit_bitmap[2]);
+ vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]);
+}
+
static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
{
u32 exit_intr_info;
@@ -7493,6 +7584,10 @@ static struct kvm_x86_ops vmx_x86_ops = {
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
.set_virtual_x2apic_mode = vmx_set_virtual_x2apic_mode,
+ .vm_has_apicv = vmx_vm_has_apicv,
+ .load_eoi_exitmap = vmx_load_eoi_exitmap,
+ .hwapic_irr_update = vmx_hwapic_irr_update,
+ .hwapic_isr_update = vmx_hwapic_isr_update,
.set_tss_addr = vmx_set_tss_addr,
.get_tdp_level = get_ept_level,
@@ -7595,7 +7690,7 @@ static int __init vmx_init(void)
memcpy(vmx_msr_bitmap_longmode_x2apic,
vmx_msr_bitmap_longmode, PAGE_SIZE);
- if (enable_apicv_reg) {
+ if (enable_apicv_reg_vid) {
for (msr = 0x800; msr <= 0x8ff; msr++)
vmx_disable_intercept_msr_read_x2apic(msr);
@@ -7607,6 +7702,10 @@ static int __init vmx_init(void)
vmx_enable_intercept_msr_read_x2apic(0x839);
/* TPR */
vmx_disable_intercept_msr_write_x2apic(0x808);
+ /* EOI */
+ vmx_disable_intercept_msr_write_x2apic(0x80b);
+ /* SELF-IPI */
+ vmx_disable_intercept_msr_write_x2apic(0x83f);
}
if (enable_ept) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5483228..97c8fb6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5525,7 +5525,7 @@ static void inject_pending_event(struct kvm_vcpu *vcpu)
vcpu->arch.nmi_injected = true;
kvm_x86_ops->set_nmi(vcpu);
}
- } else if (kvm_cpu_has_interrupt(vcpu)) {
+ } else if (kvm_cpu_has_injectable_intr(vcpu)) {
if (kvm_x86_ops->interrupt_allowed(vcpu)) {
kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
false);
@@ -5593,6 +5593,16 @@ static void kvm_gen_update_masterclock(struct kvm *kvm)
#endif
}
+static void update_eoi_exitmap(struct kvm_vcpu *vcpu)
+{
+ u64 eoi_exit_bitmap[4];
+
+ memset(eoi_exit_bitmap, 0, 32);
+
+ kvm_ioapic_calculate_eoi_exitmap(vcpu, eoi_exit_bitmap);
+ kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
+}
+
static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
{
int r;
@@ -5646,6 +5656,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
kvm_handle_pmu_event(vcpu);
if (kvm_check_request(KVM_REQ_PMI, vcpu))
kvm_deliver_pmi(vcpu);
+ if (kvm_check_request(KVM_REQ_EOIBITMAP, vcpu))
+ update_eoi_exitmap(vcpu);
}
if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
@@ -5654,10 +5666,17 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
/* enable NMI/IRQ window open exits if needed */
if (vcpu->arch.nmi_pending)
kvm_x86_ops->enable_nmi_window(vcpu);
- else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
+ else if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win)
kvm_x86_ops->enable_irq_window(vcpu);
if (kvm_lapic_enabled(vcpu)) {
+ /*
+ * Update architecture specific hints for APIC
+ * virtual interrupt delivery.
+ */
+ if (kvm_x86_ops->hwapic_irr_update)
+ kvm_x86_ops->hwapic_irr_update(vcpu,
+ kvm_lapic_find_highest_irr(vcpu));
update_cr8_intercept(vcpu);
kvm_lapic_sync_to_vapic(vcpu);
}
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 4dd7d75..0350e0d 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -123,6 +123,7 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQ_MASTERCLOCK_UPDATE 19
#define KVM_REQ_MCLOCK_INPROGRESS 20
#define KVM_REQ_EPR_EXIT 21
+#define KVM_REQ_EOIBITMAP 22
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
@@ -538,6 +539,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_flush_remote_tlbs(struct kvm *kvm);
void kvm_reload_remote_mmus(struct kvm *kvm);
void kvm_make_mclock_inprogress_request(struct kvm *kvm);
+void kvm_make_update_eoibitmap_request(struct kvm *kvm);
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg);
@@ -691,6 +693,7 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
int irq_source_id, int level);
+bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian);
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index f3abbef..ce82b94 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -35,6 +35,7 @@
#include <linux/hrtimer.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/export.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/current.h>
@@ -115,6 +116,42 @@ static void update_handled_vectors(struct kvm_ioapic *ioapic)
smp_wmb();
}
+void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
+ u64 *eoi_exit_bitmap)
+{
+ struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
+ union kvm_ioapic_redirect_entry *e;
+ struct kvm_lapic_irq irqe;
+ int index;
+
+ spin_lock(&ioapic->lock);
+ /* traverse ioapic entry to set eoi exit bitmap*/
+ for (index = 0; index < IOAPIC_NUM_PINS; index++) {
+ e = &ioapic->redirtbl[index];
+ if (!e->fields.mask &&
+ (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
+ kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
+ index))) {
+ irqe.dest_id = e->fields.dest_id;
+ irqe.vector = e->fields.vector;
+ irqe.dest_mode = e->fields.dest_mode;
+ irqe.delivery_mode = e->fields.delivery_mode << 8;
+ kvm_calculate_eoi_exitmap(vcpu, &irqe, eoi_exit_bitmap);
+ }
+ }
+ spin_unlock(&ioapic->lock);
+}
+EXPORT_SYMBOL_GPL(kvm_ioapic_calculate_eoi_exitmap);
+
+void kvm_ioapic_make_eoibitmap_request(struct kvm *kvm)
+{
+ struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+
+ if (!kvm_apic_vid_enabled(kvm) || !ioapic)
+ return;
+ kvm_make_update_eoibitmap_request(kvm);
+}
+
static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
{
unsigned index;
@@ -156,6 +193,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
&& ioapic->irr & (1 << index))
ioapic_service(ioapic, index);
+ kvm_ioapic_make_eoibitmap_request(ioapic->kvm);
break;
}
}
@@ -455,6 +493,7 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
spin_lock(&ioapic->lock);
memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
update_handled_vectors(ioapic);
+ kvm_ioapic_make_eoibitmap_request(kvm);
spin_unlock(&ioapic->lock);
return 0;
}
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index a30abfe..0400a46 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -82,5 +82,9 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
struct kvm_lapic_irq *irq);
int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
+void kvm_ioapic_make_eoibitmap_request(struct kvm *kvm);
+void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
+ u64 *eoi_exit_bitmap);
+
#endif
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 656fa45..ff6d40e 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -22,6 +22,7 @@
#include <linux/kvm_host.h>
#include <linux/slab.h>
+#include <linux/export.h>
#include <trace/events/kvm.h>
#include <asm/msidef.h>
@@ -237,6 +238,28 @@ int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level)
return ret;
}
+bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
+{
+ struct kvm_irq_ack_notifier *kian;
+ struct hlist_node *n;
+ int gsi;
+
+ rcu_read_lock();
+ gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
+ if (gsi != -1)
+ hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list,
+ link)
+ if (kian->gsi == gsi) {
+ rcu_read_unlock();
+ return true;
+ }
+
+ rcu_read_unlock();
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
+
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
struct kvm_irq_ack_notifier *kian;
@@ -261,6 +284,7 @@ void kvm_register_irq_ack_notifier(struct kvm *kvm,
mutex_lock(&kvm->irq_lock);
hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
mutex_unlock(&kvm->irq_lock);
+ kvm_ioapic_make_eoibitmap_request(kvm);
}
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
@@ -270,6 +294,7 @@ void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
hlist_del_init_rcu(&kian->link);
mutex_unlock(&kvm->irq_lock);
synchronize_rcu();
+ kvm_ioapic_make_eoibitmap_request(kvm);
}
int kvm_request_irq_source_id(struct kvm *kvm)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5e709eb..7aabc24 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -217,6 +217,11 @@ void kvm_make_mclock_inprogress_request(struct kvm *kvm)
make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
}
+void kvm_make_update_eoibitmap_request(struct kvm *kvm)
+{
+ make_all_cpus_request(kvm, KVM_REQ_EOIBITMAP);
+}
+
int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
{
struct page *page;
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
