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linux-uek6-v5.4.17-2036.101.1.patch
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linux-uek6-v5.4.17-2036.101.1.patch
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From 87804c2f2cbdc1c6fd664e251c96e37200828145 Mon Sep 17 00:00:00 2001
From: Dongli Zhang <[email protected]>
Date: Wed, 27 Jan 2021 21:47:33 -0800
Subject: [PATCH 1/1] linux uek6 v5.4.17-2036.101.1
Signed-off-by: Dongli Zhang <[email protected]>
---
arch/x86/include/asm/irq_vectors.h | 17 +
arch/x86/kernel/irq.c | 7 +
arch/x86/kvm/irq.c | 10 +
arch/x86/kvm/lapic.c | 696 ++++++++++++++++++++++++++
arch/x86/kvm/lapic.h | 115 +++++
arch/x86/kvm/vmx/vmx.c | 173 +++++++
arch/x86/kvm/vmx/vmx.h | 64 +++
arch/x86/kvm/x86.c | 46 ++
drivers/infiniband/core/cm.c | 6 +
drivers/infiniband/sw/rxe/rxe_net.c | 55 ++
drivers/infiniband/sw/rxe/rxe_verbs.c | 34 ++
drivers/scsi/iscsi_tcp.c | 105 ++++
drivers/scsi/libiscsi.c | 4 +
drivers/scsi/scsi_transport_iscsi.c | 10 +
include/linux/kvm_host.h | 38 ++
include/uapi/linux/kvm.h | 7 +
net/rds/af_rds.c | 49 ++
net/rds/bind.c | 6 +
net/rds/connection.c | 143 ++++++
net/rds/ib.c | 10 +
net/rds/ib.h | 21 +
net/rds/ib_cm.c | 94 ++++
net/rds/ib_rdma.c | 4 +
net/rds/ib_recv.c | 46 ++
net/rds/ib_ring.c | 13 +
net/rds/ib_send.c | 44 ++
net/rds/ib_stats.c | 3 +
net/rds/info.c | 4 +
net/rds/rdma.c | 6 +
net/rds/rdma_transport.c | 6 +
net/rds/rds.h | 30 ++
net/rds/recv.c | 62 +++
net/rds/send.c | 90 ++++
net/rds/threads.c | 4 +
net/rds/transport.c | 14 +
virt/kvm/kvm_main.c | 56 +++
36 files changed, 2092 insertions(+)
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 889f8b1b5b7f..f0941450699c 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -92,7 +92,24 @@
/* Vector for KVM to deliver posted interrupt IPI */
#ifdef CONFIG_HAVE_KVM
+/*
+ * 在以下使用POSTED_INTR_VECTOR:
+ * - arch/x86/kernel/idt.c|135| <<global>> INTG(POSTED_INTR_VECTOR, kvm_posted_intr_ipi),
+ * - arch/x86/include/asm/entry_arch.h|22| <<BUILD_INTERRUPT>> BUILD_INTERRUPT(kvm_posted_intr_ipi, POSTED_INTR_VECTOR)
+ * - arch/x86/kvm/vmx/vmx.c|3823| <<kvm_vcpu_trigger_posted_interrupt>> int pi_vec = nested ? POSTED_INTR_NESTED_VECTOR : POSTED_INTR_VECTOR;
+ * - arch/x86/kvm/vmx/vmx.c|4241| <<vmx_vcpu_setup>> vmcs_write16(POSTED_INTR_NV, POSTED_INTR_VECTOR);
+ * - arch/x86/kvm/vmx/vmx.c|6850| <<vmx_create_vcpu>> vmx->pi_desc.nv = POSTED_INTR_VECTOR;
+ * - arch/x86/kvm/vmx/vmx.c|7415| <<__pi_post_block>> new.nv = POSTED_INTR_VECTOR;
+ */
#define POSTED_INTR_VECTOR 0xf2
+/*
+ * 在以下使用POSTED_INTR_WAKEUP_VECTOR:
+ * - arch/x86/kernel/idt.c|136| <<global>> INTG(POSTED_INTR_WAKEUP_VECTOR, kvm_posted_intr_wakeup_ipi),
+ * - arch/x86/include/asm/entry_arch.h|23| <<BUILD_INTERRUPT>> BUILD_INTERRUPT(kvm_posted_intr_wakeup_ipi, POSTED_INTR_WAKEUP_VECTOR)
+ * - arch/x86/kvm/vmx/vmx.c|1275| <<vmx_vcpu_pi_load>> if (pi_desc->nv == POSTED_INTR_WAKEUP_VECTOR || vcpu->cpu == cpu) {
+ * - arch/x86/kvm/vmx/vmx.c|7404| <<__pi_post_block>> WARN(old.nv != POSTED_INTR_WAKEUP_VECTOR,
+ * - arch/x86/kvm/vmx/vmx.c|7489| <<pi_pre_block>> new.nv = POSTED_INTR_WAKEUP_VECTOR;
+ */
#define POSTED_INTR_WAKEUP_VECTOR 0xf1
#define POSTED_INTR_NESTED_VECTOR 0xf0
#endif
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 21efee32e2b1..0fa9b53ac96b 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -291,6 +291,10 @@ __visible void __irq_entry smp_x86_platform_ipi(struct pt_regs *regs)
static void dummy_handler(void) {}
static void (*kvm_posted_intr_wakeup_handler)(void) = dummy_handler;
+/*
+ * called by:
+ * - arch/x86/kvm/vmx/vmx.c|7840| <<hardware_setup>> kvm_set_posted_intr_wakeup_handler(wakeup_handler);
+ */
void kvm_set_posted_intr_wakeup_handler(void (*handler)(void))
{
if (handler)
@@ -322,6 +326,9 @@ __visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs)
entering_ack_irq();
inc_irq_stat(kvm_posted_intr_wakeup_ipis);
+ /*
+ * 比如wakeup_handler()
+ */
kvm_posted_intr_wakeup_handler();
exiting_irq();
set_irq_regs(old_regs);
diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index e330e7d125f7..98ae80007141 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -148,6 +148,16 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
}
EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);
+/*
+ * called by:
+ * - arch/x86/kvm/x86.c|8509| <<vcpu_run>> kvm_inject_pending_timer_irqs(vcpu);
+ *
+ * vcpu_run():
+ * kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu);
+ * if (kvm_cpu_has_pending_timer(vcpu))
+ * kvm_inject_pending_timer_irqs(vcpu);
+ * -> kvm_inject_apic_timer_irqs()
+ */
void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu)
{
if (lapic_in_kernel(vcpu))
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2c4daaf6c551..fc29ad84c388 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -53,16 +53,52 @@
#define PRIu64 "u"
#define PRIo64 "o"
+/*
+ * https://kernelgo.org/interrupt-remapping.html
+ *
+ * https://kernelgo.org/vtd_interrupt_remapping_code_analysis.html
+ *
+ * https://kernelgo.org/posted-interrupt.html
+ *
+ * https://kernelgo.org/vtd-posted-interrupt-code-analysis.html
+ */
+
+/*
+ * 当一个设备被直通给虚拟机后,虚拟机初始化的过程中VMM会设置好此设备的MSI/MSI-X中断
+ * 对应的IRTE并标志IM位为1b,标志这是一个Posted Interrupt.当直通设备投递一个中断后,
+ * 硬件首先会去查询irq对应的IRTE并从IRTE中提取记录的Posted Interrupt Descriptor
+ * 地址和vector信息,然后更新PIR域和ON域并且将vector信息写入到VCPU的vAPIC Page中,
+ * 直接给处于None Root模式的VCPU注入一个中断,整个过程不需要VMM的介入从而十分高效.
+ */
+
/* 14 is the version for Xeon and Pentium 8.4.8*/
#define APIC_VERSION (0x14UL | ((KVM_APIC_LVT_NUM - 1) << 16))
#define LAPIC_MMIO_LENGTH (1 << 12)
/* followed define is not in apicdef.h */
+/*
+ * 在以下使用MAX_APIC_VECTOR:
+ * - arch/x86/kvm/lapic.c|371| <<find_highest_vector>> for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
+ * - arch/x86/kvm/lapic.c|387| <<count_vectors>> for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
+ * - arch/x86/kvm/lapic.c|492| <<apic_set_isr>> BUG_ON(apic->isr_count > MAX_APIC_VECTOR);
+ */
#define MAX_APIC_VECTOR 256
+/*
+ * 在以下使用APIC_VECTORS_PER_REG:
+ * - arch/x86/kvm/lapic.c|371| <<find_highest_vector>> for (vec = MAX_APIC_VECTOR - APIC_VECTORS_PER_REG;
+ * - arch/x86/kvm/lapic.c|372| <<find_highest_vector>> vec >= 0; vec -= APIC_VECTORS_PER_REG) {
+ * - arch/x86/kvm/lapic.c|387| <<count_vectors>> for (vec = 0; vec < MAX_APIC_VECTOR; vec += APIC_VECTORS_PER_REG) {
+ */
#define APIC_VECTORS_PER_REG 32
#define APIC_BROADCAST 0xFF
#define X2APIC_BROADCAST 0xFFFFFFFFul
+/*
+ * 在以下使用lapic_timer_advance_dynamic:
+ * - arch/x86/kvm/lapic.c|1571| <<__kvm_wait_lapic_expire>> if (lapic_timer_advance_dynamic)
+ * - arch/x86/kvm/lapic.c|2368| <<kvm_create_lapic>> lapic_timer_advance_dynamic = true;
+ * - arch/x86/kvm/lapic.c|2371| <<kvm_create_lapic>> lapic_timer_advance_dynamic = false;
+ */
static bool lapic_timer_advance_dynamic __read_mostly;
#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 /* clock cycles */
#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 10000 /* clock cycles */
@@ -71,11 +107,29 @@ static bool lapic_timer_advance_dynamic __read_mostly;
/* step-by-step approximation to mitigate fluctuation */
#define LAPIC_TIMER_ADVANCE_ADJUST_STEP 8
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|101| <<kvm_apic_pending_eoi>> return apic_test_vector(vector, apic->regs + APIC_ISR) ||
+ * - arch/x86/kvm/lapic.c|102| <<kvm_apic_pending_eoi>> apic_test_vector(vector, apic->regs + APIC_IRR);
+ * - arch/x86/kvm/lapic.c|1173| <<__apic_accept_irq>> if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) {
+ * - arch/x86/kvm/lapic.c|1272| <<kvm_ioapic_send_eoi>> if (apic_test_vector(vector, apic->regs + APIC_TMR))
+ * - arch/x86/kvm/lapic.c|1625| <<lapic_timer_int_injected>> if (apic_test_vector(vec, bitmap))
+ */
static inline int apic_test_vector(int vec, void *bitmap)
{
return test_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
}
+/*
+ * called by:
+ * - arch/x86/kvm/ioapic.c|122| <<__rtc_irq_eoi_tracking_restore_one>> new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
+ * - arch/x86/kvm/ioapic.c|194| <<ioapic_lazy_update_eoi>> kvm_apic_pending_eoi(vcpu, entry->fields.vector))
+ * - arch/x86/kvm/ioapic.c|299| <<kvm_ioapic_scan_entry>> kvm_apic_pending_eoi(vcpu, e->fields.vector))
+ *
+ * IRR: LAPIC已经收到中断但是还未提交CPU处理, 当前LAPIC接收到的中断请求
+ * ISR: CPU已经开始处理中断,但是尚未完成, 当前LAPIC送入CPU中(CPU正在处理)的中断请求
+ * EOI软件写入表示中断处理完成
+ */
bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
{
struct kvm_lapic *apic = vcpu->arch.apic;
@@ -84,19 +138,67 @@ bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
apic_test_vector(vector, apic->regs + APIC_IRR);
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|584| <<apic_set_isr>> if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
+ */
static inline int __apic_test_and_set_vector(int vec, void *bitmap)
{
return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|630| <<apic_clear_isr>> if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
+ */
static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
{
return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
}
+/*
+ * crash> apic_hw_disabled
+ * apic_hw_disabled = $4 = {
+ * key = {
+ * enabled = {
+ * counter = 0
+ * },
+ *
+ * 在以下使用apic_hw_disabled:
+ * - arch/x86/kvm/lapic.c|2067| <<kvm_free_lapic>> static_key_slow_dec_deferred(&apic_hw_disabled);
+ * - arch/x86/kvm/lapic.c|2144| <<kvm_lapic_set_base>> static_key_slow_dec_deferred(&apic_hw_disabled);
+ * - arch/x86/kvm/lapic.c|2146| <<kvm_lapic_set_base>> static_key_slow_inc(&apic_hw_disabled.key);
+ * - arch/x86/kvm/lapic.c|2766| <<kvm_lapic_init>> jump_label_rate_limit(&apic_hw_disabled, HZ);
+ * - arch/x86/kvm/lapic.c|2772| <<kvm_lapic_exit>> static_key_deferred_flush(&apic_hw_disabled);
+ * - arch/x86/kvm/lapic.h|177| <<kvm_apic_hw_enabled>> if (static_key_false(&apic_hw_disabled.key))
+ */
struct static_key_deferred apic_hw_disabled __read_mostly;
+/*
+ * crash> apic_sw_disabled
+ * apic_sw_disabled = $5 = {
+ * key = {
+ * enabled = {
+ * counter = 0
+ * },
+ *
+ * 在以下使用apic_sw_disabled:
+ * - arch/x86/kvm/lapic.c|261| <<apic_set_spiv>> static_key_slow_dec_deferred(&apic_sw_disabled);
+ * - arch/x86/kvm/lapic.c|263| <<apic_set_spiv>> static_key_slow_inc(&apic_sw_disabled.key);
+ * - arch/x86/kvm/lapic.c|2070| <<kvm_free_lapic>> static_key_slow_dec_deferred(&apic_sw_disabled);
+ * - arch/x86/kvm/lapic.c|2341| <<kvm_create_lapic>> static_key_slow_inc(&apic_sw_disabled.key);
+ * - arch/x86/kvm/lapic.c|2767| <<kvm_lapic_init>> jump_label_rate_limit(&apic_sw_disabled, HZ);
+ * - arch/x86/kvm/lapic.c|2773| <<kvm_lapic_exit>> static_key_deferred_flush(&apic_sw_disabled);
+ * - arch/x86/kvm/lapic.h|186| <<kvm_apic_sw_enabled>> if (static_key_false(&apic_sw_disabled.key))
+ */
struct static_key_deferred apic_sw_disabled __read_mostly;
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1104| <<__apic_accept_irq>> if (unlikely(!apic_enabled(apic)))
+ * - arch/x86/kvm/lapic.c|2486| <<apic_has_pending_timer>> if (apic_enabled(apic) && apic_lvt_enabled(apic, APIC_LVTT))
+ *
+ * kvm_apic_sw_enabled()和kvm_apic_ww_enabled()同时返回true
+ */
static inline int apic_enabled(struct kvm_lapic *apic)
{
return kvm_apic_sw_enabled(apic) && kvm_apic_hw_enabled(apic);
@@ -109,22 +211,57 @@ static inline int apic_enabled(struct kvm_lapic *apic)
(LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|286| <<recalculate_apic_map>> max_id = max(max_id, kvm_x2apic_id(vcpu->arch.apic));
+ * - arch/x86/kvm/lapic.c|309| <<recalculate_apic_map>> x2apic_id = kvm_x2apic_id(apic);
+ * - arch/x86/kvm/lapic.c|873| <<kvm_apic_match_physical_addr>> return mda == kvm_x2apic_id(apic);
+ * - arch/x86/kvm/lapic.c|881| <<kvm_apic_match_physical_addr>> if (kvm_x2apic_id(apic) > 0xff && mda == kvm_x2apic_id(apic))
+ */
static inline u32 kvm_x2apic_id(struct kvm_lapic *apic)
{
return apic->vcpu->vcpu_id;
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|176| <<kvm_use_posted_timer_interrupt>> return kvm_can_post_timer_interrupt(vcpu) && vcpu->mode == IN_GUEST_MODE;
+ * - arch/x86/kvm/lapic.c|2801| <<__kvm_migrate_apic_timer>> kvm_can_post_timer_interrupt(vcpu))
+ * - arch/x86/kvm/vmx/vmx.c|7277| <<vmx_set_hv_timer>> kvm_can_post_timer_interrupt(vcpu))
+ */
bool kvm_can_post_timer_interrupt(struct kvm_vcpu *vcpu)
{
+ /*
+ * 在以下使用pi_inject_timer:
+ * - arch/x86/kvm/x86.c|162| <<global>> module_param(pi_inject_timer, bint, S_IRUGO | S_IWUSR);
+ * - arch/x86/kvm/lapic.c|119| <<kvm_can_post_timer_interrupt>> return pi_inject_timer && kvm_vcpu_apicv_active(vcpu);
+ * - arch/x86/kvm/x86.c|7352| <<kvm_arch_init>> if (pi_inject_timer == -1)
+ * - arch/x86/kvm/x86.c|7353| <<kvm_arch_init>> pi_inject_timer = housekeeping_enabled(HK_FLAG_TIMER);
+ *
+ * pi_inject_timer测试是0
+ */
return pi_inject_timer && kvm_vcpu_apicv_active(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_can_post_timer_interrupt);
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1701| <<apic_timer_expired>> if (kvm_use_posted_timer_interrupt(apic->vcpu)) {
+ */
static bool kvm_use_posted_timer_interrupt(struct kvm_vcpu *vcpu)
{
+ /*
+ * 一个设置IN_GUEST_MODE的例子:
+ * - arch/x86/kvm/x86.c|8298| <<vcpu_enter_guest>> vcpu->mode = IN_GUEST_MODE;
+ */
return kvm_can_post_timer_interrupt(vcpu) && vcpu->mode == IN_GUEST_MODE;
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|337| <<recalculate_apic_map>> if (!kvm_apic_map_get_logical_dest(new, ldr, &cluster, &mask))
+ * - arch/x86/kvm/lapic.c|1046| <<kvm_apic_map_get_dest_lapic>> if (!kvm_apic_map_get_logical_dest(map, irq->dest_id, dst,
+ */
static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map *map,
u32 dest_id, struct kvm_lapic ***cluster, u16 *mask) {
switch (map->mode) {
@@ -169,6 +306,16 @@ static void kvm_apic_map_free(struct rcu_head *rcu)
kvfree(map);
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|385| <<apic_set_spiv>> recalculate_apic_map(apic->vcpu->kvm);
+ * - arch/x86/kvm/lapic.c|392| <<kvm_apic_set_xapic_id>> recalculate_apic_map(apic->vcpu->kvm);
+ * - arch/x86/kvm/lapic.c|398| <<kvm_apic_set_ldr>> recalculate_apic_map(apic->vcpu->kvm);
+ * - arch/x86/kvm/lapic.c|414| <<kvm_apic_set_x2apic_id>> recalculate_apic_map(apic->vcpu->kvm);
+ * - arch/x86/kvm/lapic.c|2317| <<kvm_lapic_reg_write>> recalculate_apic_map(apic->vcpu->kvm);
+ * - arch/x86/kvm/lapic.c|2578| <<kvm_lapic_set_base>> recalculate_apic_map(vcpu->kvm);
+ * - arch/x86/kvm/lapic.c|3013| <<kvm_apic_set_state>> recalculate_apic_map(vcpu->kvm);
+ */
static void recalculate_apic_map(struct kvm *kvm)
{
struct kvm_apic_map *new, *old = NULL;
@@ -255,8 +402,25 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
kvm_lapic_set_reg(apic, APIC_SPIV, val);
+ /*
+ * 在以下使用kvm_lapic->sw_enabled:
+ * - arch/x86/kvm/lapic.c|302| <<apic_set_spiv>> if (enabled != apic->sw_enabled) {
+ * - arch/x86/kvm/lapic.c|303| <<apic_set_spiv>> apic->sw_enabled = enabled;\
+ * - arch/x86/kvm/lapic.c|2262| <<kvm_free_lapic>> if (!apic->sw_enabled)
+ * - arch/x86/kvm/lapic.h|237| <<kvm_apic_sw_enabled>> return apic->sw_enabled;
+ */
if (enabled != apic->sw_enabled) {
apic->sw_enabled = enabled;
+ /*
+ * 在以下使用apic_sw_disabled:
+ * - arch/x86/kvm/lapic.c|261| <<apic_set_spiv>> static_key_slow_dec_deferred(&apic_sw_disabled);
+ * - arch/x86/kvm/lapic.c|263| <<apic_set_spiv>> static_key_slow_inc(&apic_sw_disabled.key);
+ * - arch/x86/kvm/lapic.c|2070| <<kvm_free_lapic>> static_key_slow_dec_deferred(&apic_sw_disabled);
+ * - arch/x86/kvm/lapic.c|2341| <<kvm_create_lapic>> static_key_slow_inc(&apic_sw_disabled.key);
+ * - arch/x86/kvm/lapic.c|2767| <<kvm_lapic_init>> jump_label_rate_limit(&apic_sw_disabled, HZ);
+ * - arch/x86/kvm/lapic.c|2773| <<kvm_lapic_exit>> static_key_deferred_flush(&apic_sw_disabled);
+ * - arch/x86/kvm/lapic.h|186| <<kvm_apic_sw_enabled>> if (static_key_false(&apic_sw_disabled.key))
+ */
if (enabled)
static_key_slow_dec_deferred(&apic_sw_disabled);
else
@@ -294,6 +458,10 @@ static inline void kvm_apic_set_x2apic_id(struct kvm_lapic *apic, u32 id)
recalculate_apic_map(apic->vcpu->kvm);
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|2721| <<apic_has_pending_timer>> if (apic_enabled(apic) && apic_lvt_enabled(apic, APIC_LVTT))
+ */
static inline int apic_lvt_enabled(struct kvm_lapic *apic, int lvt_type)
{
return !(kvm_lapic_get_reg(apic, lvt_type) & APIC_LVT_MASKED);
@@ -304,8 +472,24 @@ static inline int apic_lvt_vector(struct kvm_lapic *apic, int lvt_type)
return kvm_lapic_get_reg(apic, lvt_type) & APIC_VECTOR_MASK;
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1543| <<kvm_apic_inject_pending_timer_irqs>> if (apic_lvtt_oneshot(apic)) {
+ * - arch/x86/kvm/lapic.c|1681| <<start_sw_period>> if (apic_lvtt_oneshot(apic))
+ * - arch/x86/kvm/lapic.c|1761| <<start_sw_timer>> if (apic_lvtt_period(apic) || apic_lvtt_oneshot(apic))
+ * - arch/x86/kvm/lapic.c|1832| <<start_apic_timer>> if ((apic_lvtt_period(apic) || apic_lvtt_oneshot(apic))
+ * - arch/x86/kvm/lapic.c|2090| <<kvm_set_lapic_tscdeadline_msr>> if (!kvm_apic_present(vcpu) || apic_lvtt_oneshot(apic) ||
+ */
static inline int apic_lvtt_oneshot(struct kvm_lapic *apic)
{
+ /*
+ * 在以下使用kvm_timer->timer_mode:
+ * - arch/x86/kvm/lapic.c|355| <<apic_lvtt_oneshot>> return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
+ * - arch/x86/kvm/lapic.c|360| <<apic_lvtt_period>> return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
+ * - arch/x86/kvm/lapic.c|365| <<apic_lvtt_tscdeadline>> return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
+ * - arch/x86/kvm/lapic.c|1470| <<apic_update_lvtt>> if (apic->lapic_timer.timer_mode != timer_mode) {
+ * - arch/x86/kvm/lapic.c|1478| <<apic_update_lvtt>> apic->lapic_timer.timer_mode = timer_mode;
+ */
return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
}
@@ -324,6 +508,13 @@ static inline int apic_lvt_nmi_mode(u32 lvt_val)
return (lvt_val & (APIC_MODE_MASK | APIC_LVT_MASKED)) == APIC_DM_NMI;
}
+/*
+ * called by:
+ * - arch/x86/kvm/cpuid.c|235| <<kvm_vcpu_ioctl_set_cpuid>> kvm_apic_set_version(vcpu);
+ * - arch/x86/kvm/cpuid.c|258| <<kvm_vcpu_ioctl_set_cpuid2>> kvm_apic_set_version(vcpu);
+ * - arch/x86/kvm/lapic.c|2650| <<kvm_lapic_reset>> kvm_apic_set_version(apic->vcpu);
+ * - arch/x86/kvm/lapic.c|3014| <<kvm_apic_set_state>> kvm_apic_set_version(vcpu);
+ */
void kvm_apic_set_version(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
@@ -355,6 +546,11 @@ static const unsigned int apic_lvt_mask[KVM_APIC_LVT_NUM] = {
LVT_MASK /* LVTERR */
};
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|563| <<apic_search_irr>> return find_highest_vector(apic->regs + APIC_IRR);
+ * - arch/x86/kvm/lapic.c|643| <<apic_find_highest_isr>> result = find_highest_vector(apic->regs + APIC_ISR);
+ */
static int find_highest_vector(void *bitmap)
{
int vec;
@@ -414,6 +610,33 @@ bool __kvm_apic_update_irr(u32 *pir, void *regs, int *max_irr)
}
EXPORT_SYMBOL_GPL(__kvm_apic_update_irr);
+/*
+ * kvm_apic_update_irr
+ * apic_has_interrupt_for_ppr
+ * kvm_apic_has_interrupt
+ * kvm_cpu_has_interrupt
+ * kvm_arch_vcpu_runnable
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * kvm_apic_update_irr
+ * vcpu_enter_guest
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/vmx/vmx.c|6228| <<vmx_sync_pir_to_irr>> kvm_apic_update_irr(vcpu, vmx->pi_desc.pir, &max_irr);
+ */
bool kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir, int *max_irr)
{
struct kvm_lapic *apic = vcpu->arch.apic;
@@ -463,6 +686,10 @@ static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
}
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|3029| <<kvm_get_apic_interrupt>> apic_set_isr(vector, apic);
+ */
static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
{
struct kvm_vcpu *vcpu;
@@ -535,6 +762,12 @@ static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
}
}
+/*
+ * called by:
+ * - arch/x86/kvm/svm.c|7548| <<global>> .sync_pir_to_irr = kvm_lapic_find_highest_irr,
+ * - arch/x86/kvm/vmx/vmx.c|6245| <<vmx_sync_pir_to_irr>> max_irr = kvm_lapic_find_highest_irr(vcpu);
+ * - arch/x86/kvm/x86.c|7626| <<update_cr8_intercept>> max_irr = kvm_lapic_find_highest_irr(vcpu);
+ */
int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
{
/* This may race with setting of irr in __apic_accept_irq() and
@@ -550,6 +783,17 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
int vector, int level, int trig_mode,
struct dest_map *dest_map);
+/*
+ * called by:
+ * - arch/x86/kvm/hyperv.c|656| <<stimer_notify_direct>> return !kvm_apic_set_irq(vcpu, &irq, NULL);
+ * - arch/x86/kvm/hyperv.c|1458| <<kvm_send_ipi_to_many>> kvm_apic_set_irq(vcpu, &irq, NULL);
+ * - arch/x86/kvm/irq_comm.c|77| <<kvm_irq_delivery_to_apic>> r += kvm_apic_set_irq(vcpu, irq, dest_map);
+ * - arch/x86/kvm/irq_comm.c|99| <<kvm_irq_delivery_to_apic>> r = kvm_apic_set_irq(lowest, irq, dest_map);
+ * - arch/x86/kvm/lapic.c|803| <<kvm_pv_send_ipi>> count += kvm_apic_set_irq(vcpu, &irq, NULL);
+ * - arch/x86/kvm/lapic.c|816| <<kvm_pv_send_ipi>> count += kvm_apic_set_irq(vcpu, &irq, NULL);
+ * - arch/x86/kvm/lapic.c|1164| <<kvm_irq_delivery_to_apic_fast>> *r = kvm_apic_set_irq(src->vcpu, irq, dest_map);
+ * - arch/x86/kvm/lapic.c|1177| <<kvm_irq_delivery_to_apic_fast>> *r += kvm_apic_set_irq(dst[i]->vcpu, irq, dest_map);
+ */
int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq,
struct dest_map *dest_map)
{
@@ -1023,6 +1267,11 @@ bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
* Add a pending IRQ into lapic.
* Return 1 if successfully added and 0 if discarded.
*/
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|642| <<kvm_apic_set_irq>> return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
+ * - arch/x86/kvm/lapic.c|2525| <<kvm_apic_local_deliver>> return __apic_accept_irq(apic, mode, vector, 1, trig_mode,
+ */
static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
int vector, int level, int trig_mode,
struct dest_map *dest_map)
@@ -1158,6 +1407,38 @@ static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
kvm_ioapic_update_eoi(apic->vcpu, vector, trigger_mode);
}
+/*
+ * 这个因为apicv所以不会调用
+ * apic_set_eoi
+ * vcpu_enter_guest
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * apic_set_eoi
+ * kvm_x2apic_msr_write
+ * kvm_set_msr_common
+ * vmx_set_msr
+ * __kvm_set_msr
+ * kvm_emulate_wrmsr
+ * vmx_handle_exit
+ * vcpu_enter_guest
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/lapic.c|2151| <<kvm_lapic_reg_write>> apic_set_eoi(apic);
+ * - arch/x86/kvm/lapic.c|2933| <<apic_sync_pv_eoi_from_guest>> vector = apic_set_eoi(apic);
+ */
static int apic_set_eoi(struct kvm_lapic *apic)
{
int vector = apic_find_highest_isr(apic);
@@ -1291,6 +1572,11 @@ static u32 __apic_read(struct kvm_lapic *apic, unsigned int offset)
return val;
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1428| <<apic_mmio_read>> struct kvm_lapic *apic = to_lapic(this);
+ * - arch/x86/kvm/lapic.c|2077| <<apic_mmio_write>> struct kvm_lapic *apic = to_lapic(this);
+ */
static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
{
return container_of(dev, struct kvm_lapic, dev);
@@ -1416,11 +1702,26 @@ static void limit_periodic_timer_frequency(struct kvm_lapic *apic)
}
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1951| <<kvm_lapic_reg_write>> apic_update_lvtt(apic);
+ * - arch/x86/kvm/lapic.c|1996| <<kvm_lapic_reg_write>> apic_update_lvtt(apic);
+ * - arch/x86/kvm/lapic.c|2238| <<kvm_lapic_reset>> apic_update_lvtt(apic);
+ * - arch/x86/kvm/lapic.c|2514| <<kvm_apic_set_state>> apic_update_lvtt(apic);
+ */
static void apic_update_lvtt(struct kvm_lapic *apic)
{
u32 timer_mode = kvm_lapic_get_reg(apic, APIC_LVTT) &
apic->lapic_timer.timer_mode_mask;
+ /*
+ * 在以下使用kvm_timer->timer_mode:
+ * - arch/x86/kvm/lapic.c|355| <<apic_lvtt_oneshot>> return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_ONESHOT;
+ * - arch/x86/kvm/lapic.c|360| <<apic_lvtt_period>> return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_PERIODIC;
+ * - arch/x86/kvm/lapic.c|365| <<apic_lvtt_tscdeadline>> return apic->lapic_timer.timer_mode == APIC_LVT_TIMER_TSCDEADLINE;
+ * - arch/x86/kvm/lapic.c|1470| <<apic_update_lvtt>> if (apic->lapic_timer.timer_mode != timer_mode) {
+ * - arch/x86/kvm/lapic.c|1478| <<apic_update_lvtt>> apic->lapic_timer.timer_mode = timer_mode;
+ */
if (apic->lapic_timer.timer_mode != timer_mode) {
if (apic_lvtt_tscdeadline(apic) != (timer_mode ==
APIC_LVT_TIMER_TSCDEADLINE)) {
@@ -1533,6 +1834,20 @@ void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_wait_lapic_expire);
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1675| <<apic_timer_expired>> kvm_apic_inject_pending_timer_irqs(apic);
+ * - arch/x86/kvm/lapic.c|2620| <<kvm_inject_apic_timer_irqs>> kvm_apic_inject_pending_timer_irqs(apic);
+ *
+ * vcpu_run():
+ * kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu);
+ * if (kvm_cpu_has_pending_timer(vcpu))
+ * kvm_inject_pending_timer_irqs(vcpu);
+ * -> kvm_inject_apic_timer_irqs()
+ * -> kvm_apic_inject_pending_timer_irqs()
+ * -> kvm_apic_local_deliver(apic, APIC_LVTT);
+ * -> atomic_set(&apic->lapic_timer.pending, 0);
+ */
static void kvm_apic_inject_pending_timer_irqs(struct kvm_lapic *apic)
{
struct kvm_timer *ktimer = &apic->lapic_timer;
@@ -1546,6 +1861,38 @@ static void kvm_apic_inject_pending_timer_irqs(struct kvm_lapic *apic)
}
}
+/*
+ * [0] apic_timer_expired
+ * [0] vmx_handle_exit
+ * [0] vcpu_enter_guest
+ * [0] kvm_arch_vcpu_ioctl_run
+ * [0] kvm_vcpu_ioctl
+ * [0] do_vfs_ioctl
+ * [0] ksys_ioctl
+ * [0] __x64_sys_ioctl
+ * [0] do_syscall_64
+ * [0] entry_SYSCALL_64_after_hwframe
+ *
+ * [0] apic_timer_expired
+ * [0] __hrtimer_run_queues
+ * [0] hrtimer_interrupt
+ * [0] smp_apic_timer_interrupt
+ * [0] apic_timer_interrupt
+ * [0] cpuidle_enter_state
+ * [0] cpuidle_enter
+ * [0] call_cpuidle
+ * [0] do_idle
+ * [0] cpu_startup_entry
+ * [0] start_secondary
+ * [0] secondary_startup_64
+ *
+ * called by:
+ * - arch/x86/kvm/lapic.c|1679| <<start_sw_tscdeadline>> apic_timer_expired(apic);
+ * - arch/x86/kvm/lapic.c|1763| <<start_sw_period>> apic_timer_expired(apic);
+ * - arch/x86/kvm/lapic.c|1829| <<start_hv_timer>> apic_timer_expired(apic);
+ * - arch/x86/kvm/lapic.c|1892| <<kvm_lapic_expired_hv_timer>> apic_timer_expired(apic);
+ * - arch/x86/kvm/lapic.c|2416| <<apic_timer_fn>> apic_timer_expired(apic);
+ */
static void apic_timer_expired(struct kvm_lapic *apic)
{
struct kvm_vcpu *vcpu = apic->vcpu;
@@ -1554,6 +1901,18 @@ static void apic_timer_expired(struct kvm_lapic *apic)
if (atomic_read(&apic->lapic_timer.pending))
return;
+ /*
+ * 主要在以下使用kvm_timer:
+ * - arch/x86/kvm/lapic.c|1637| <<apic_timer_expired>> if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1781| <<kvm_lapic_hv_timer_in_use>> return vcpu->arch.apic->lapic_timer.hv_timer_in_use;
+ * - arch/x86/kvm/lapic.c|1788| <<cancel_hv_timer>> WARN_ON(!apic->lapic_timer.hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1790| <<cancel_hv_timer>> apic->lapic_timer.hv_timer_in_use = false;
+ * - arch/x86/kvm/lapic.c|1813| <<start_hv_timer>> ktimer->hv_timer_in_use = true;
+ * - arch/x86/kvm/lapic.c|1834| <<start_hv_timer>> trace_kvm_hv_timer_state(vcpu->vcpu_id, ktimer->hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1849| <<start_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1888| <<kvm_lapic_expired_hv_timer>> if (!apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1915| <<kvm_lapic_switch_to_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ */
if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
ktimer->expired_tscdeadline = ktimer->tscdeadline;
@@ -1568,6 +1927,10 @@ static void apic_timer_expired(struct kvm_lapic *apic)
kvm_set_pending_timer(vcpu);
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|2045| <<start_sw_timer>> start_sw_tscdeadline(apic);
+ */
static void start_sw_tscdeadline(struct kvm_lapic *apic)
{
struct kvm_timer *ktimer = &apic->lapic_timer;
@@ -1669,6 +2032,10 @@ static void advance_periodic_target_expiration(struct kvm_lapic *apic)
nsec_to_cycles(apic->vcpu, delta);
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|1846| <<start_sw_timer>> start_sw_period(apic);
+ */
static void start_sw_period(struct kvm_lapic *apic)
{
if (!apic->lapic_timer.period)
@@ -1703,9 +2070,27 @@ static void cancel_hv_timer(struct kvm_lapic *apic)
WARN_ON(preemptible());
WARN_ON(!apic->lapic_timer.hv_timer_in_use);
kvm_x86_ops->cancel_hv_timer(apic->vcpu);
+ /*
+ * 主要在以下使用kvm_timer->hv_timer_in_use:
+ * - arch/x86/kvm/lapic.c|1637| <<apic_timer_expired>> if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1781| <<kvm_lapic_hv_timer_in_use>> return vcpu->arch.apic->lapic_timer.hv_timer_in_use;
+ * - arch/x86/kvm/lapic.c|1788| <<cancel_hv_timer>> WARN_ON(!apic->lapic_timer.hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1790| <<cancel_hv_timer>> apic->lapic_timer.hv_timer_in_use = false;
+ * - arch/x86/kvm/lapic.c|1813| <<start_hv_timer>> ktimer->hv_timer_in_use = true;
+ * - arch/x86/kvm/lapic.c|1834| <<start_hv_timer>> trace_kvm_hv_timer_state(vcpu->vcpu_id, ktimer->hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1849| <<start_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1888| <<kvm_lapic_expired_hv_timer>> if (!apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1915| <<kvm_lapic_switch_to_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ */
apic->lapic_timer.hv_timer_in_use = false;
}
+/*
+ * EXIT_REASON_PREEMPTION_TIMER-->handle_preemption_timer()
+ *
+ * called by:
+ * - arch/x86/kvm/lapic.c|1850| <<restart_apic_timer>> if (!start_hv_timer(apic))
+ */
static bool start_hv_timer(struct kvm_lapic *apic)
{
struct kvm_timer *ktimer = &apic->lapic_timer;
@@ -1719,9 +2104,24 @@ static bool start_hv_timer(struct kvm_lapic *apic)
if (!ktimer->tscdeadline)
return false;
+ /*
+ * vmx_set_hv_timer()
+ */
if (kvm_x86_ops->set_hv_timer(vcpu, ktimer->tscdeadline, &expired))
return false;
+ /*
+ * 主要在以下使用kvm_timer->hv_timer_in_use:
+ * - arch/x86/kvm/lapic.c|1637| <<apic_timer_expired>> if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1781| <<kvm_lapic_hv_timer_in_use>> return vcpu->arch.apic->lapic_timer.hv_timer_in_use;
+ * - arch/x86/kvm/lapic.c|1788| <<cancel_hv_timer>> WARN_ON(!apic->lapic_timer.hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1790| <<cancel_hv_timer>> apic->lapic_timer.hv_timer_in_use = false;
+ * - arch/x86/kvm/lapic.c|1813| <<start_hv_timer>> ktimer->hv_timer_in_use = true;
+ * - arch/x86/kvm/lapic.c|1834| <<start_hv_timer>> trace_kvm_hv_timer_state(vcpu->vcpu_id, ktimer->hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1849| <<start_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1888| <<kvm_lapic_expired_hv_timer>> if (!apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1915| <<kvm_lapic_switch_to_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ */
ktimer->hv_timer_in_use = true;
hrtimer_cancel(&ktimer->timer);
@@ -1748,11 +2148,31 @@ static bool start_hv_timer(struct kvm_lapic *apic)
return true;
}
+/*
+ * start_sw_timer
+ * vmx_pre_block
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * called by;
+ * - arch/x86/kvm/lapic.c|1860| <<restart_apic_timer>> start_sw_timer(apic);
+ * - arch/x86/kvm/lapic.c|1899| <<kvm_lapic_switch_to_sw_timer>> start_sw_timer(apic);
+ */
static void start_sw_timer(struct kvm_lapic *apic)
{
struct kvm_timer *ktimer = &apic->lapic_timer;
WARN_ON(preemptible());
+ /*
+ * 主要在以下设置kvm_timer->hv_timer_in_use:
+ * - arch/x86/kvm/lapic.c|1790| <<cancel_hv_timer>> apic->lapic_timer.hv_timer_in_use = false;
+ * - arch/x86/kvm/lapic.c|1813| <<start_hv_timer>> ktimer->hv_timer_in_use = true;
+ */
if (apic->lapic_timer.hv_timer_in_use)
cancel_hv_timer(apic);
if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))
@@ -1765,6 +2185,41 @@ static void start_sw_timer(struct kvm_lapic *apic)
trace_kvm_hv_timer_state(apic->vcpu->vcpu_id, false);
}
+/*
+ * [0] restart_apic_timer
+ * [0] vmx_post_block
+ * [0] kvm_arch_vcpu_ioctl_run
+ * [0] kvm_vcpu_ioctl
+ * [0] do_vfs_ioctl
+ * [0] ksys_ioctl
+ * [0] __x64_sys_ioctl
+ * [0] do_syscall_64
+ * [0] entry_SYSCALL_64_after_hwframe
+ *
+ * [0] restart_apic_timer
+ * [0] kvm_lapic_reg_write
+ * [0] kvm_x2apic_msr_write
+ * [0] kvm_set_msr_common
+ * [0] vmx_set_msr
+ * [0] __kvm_set_msr
+ * [0] kvm_emulate_wrmsr
+ * [0] vmx_handle_exit
+ * [0] vcpu_enter_guest
+ * [0] kvm_arch_vcpu_ioctl_run
+ * [0] kvm_vcpu_ioctl
+ * [0] do_vfs_ioctl
+ * [0] ksys_ioctl
+ * [0] __x64_sys_ioctl
+ * [0] do_syscall_64
+ * [0] entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/lapic.c|1879| <<kvm_lapic_expired_hv_timer>> restart_apic_timer(apic);
+ * - arch/x86/kvm/lapic.c|1888| <<kvm_lapic_switch_to_hv_timer>> restart_apic_timer(vcpu->arch.apic);
+ * - arch/x86/kvm/lapic.c|1909| <<kvm_lapic_restart_hv_timer>> restart_apic_timer(apic);
+ * - arch/x86/kvm/lapic.c|1926| <<start_apic_timer>> restart_apic_timer(apic);
+ * - arch/x86/kvm/lapic.c|2061| <<kvm_lapic_reg_write>> restart_apic_timer(apic);
+ */
static void restart_apic_timer(struct kvm_lapic *apic)
{
preempt_disable();
@@ -1778,12 +2233,42 @@ static void restart_apic_timer(struct kvm_lapic *apic)
preempt_enable();
}
+/*
+ * [0] kvm_lapic_expired_hv_timer
+ * [0] vcpu_enter_guest
+ * [0] kvm_arch_vcpu_ioctl_run
+ * [0] kvm_vcpu_ioctl
+ * [0] do_vfs_ioctl
+ * [0] ksys_ioctl
+ * [0] __x64_sys_ioctl
+ * [0] do_syscall_64
+ * [0] entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/vmx/vmx.c|5570| <<handle_preemption_timer>> kvm_lapic_expired_hv_timer(vcpu);
+ *
+ * EXIT_REASON_PREEMPTION_TIMER
+ * ->handle_preemption_timer()
+ * -> kvm_lapic_expired_hv_timer()
+ */
void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
preempt_disable();
/* If the preempt notifier has already run, it also called apic_timer_expired */
+ /*
+ * 主要在以下使用kvm_timer->hv_timer_in_use:
+ * - arch/x86/kvm/lapic.c|1637| <<apic_timer_expired>> if (apic_lvtt_tscdeadline(apic) || ktimer->hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1781| <<kvm_lapic_hv_timer_in_use>> return vcpu->arch.apic->lapic_timer.hv_timer_in_use;
+ * - arch/x86/kvm/lapic.c|1788| <<cancel_hv_timer>> WARN_ON(!apic->lapic_timer.hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1790| <<cancel_hv_timer>> apic->lapic_timer.hv_timer_in_use = false;
+ * - arch/x86/kvm/lapic.c|1813| <<start_hv_timer>> ktimer->hv_timer_in_use = true;
+ * - arch/x86/kvm/lapic.c|1834| <<start_hv_timer>> trace_kvm_hv_timer_state(vcpu->vcpu_id, ktimer->hv_timer_in_use);
+ * - arch/x86/kvm/lapic.c|1849| <<start_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1888| <<kvm_lapic_expired_hv_timer>> if (!apic->lapic_timer.hv_timer_in_use)
+ * - arch/x86/kvm/lapic.c|1915| <<kvm_lapic_switch_to_sw_timer>> if (apic->lapic_timer.hv_timer_in_use)
+ */
if (!apic->lapic_timer.hv_timer_in_use)
goto out;
WARN_ON(swait_active(&vcpu->wq));
@@ -1799,18 +2284,67 @@ void kvm_lapic_expired_hv_timer(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_lapic_expired_hv_timer);
+/*
+ * kvm_lapic_switch_to_hv_timer
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/vmx/vmx.c|7523| <<vmx_post_block>> kvm_lapic_switch_to_hv_timer(vcpu);
+ *
+ * kvm_arch_vcpu_ioctl_run()
+ * -> vcpu_run()
+ * -> vcpu_block()
+ * -> kvm_x86_ops->pre_block() = vmx_pre_block()
+ * -> kvm_lapic_switch_to_sw_timer()
+ * -> kvm_vcpu_block()
+ * -> kvm_x86_ops->post_block = vmx_post_block()
+ * -> kvm_lapic_switch_to_hv_timer()
+ */
void kvm_lapic_switch_to_hv_timer(struct kvm_vcpu *vcpu)
{
restart_apic_timer(vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_lapic_switch_to_hv_timer);
+/*
+ * kvm_lapic_switch_to_sw_timer
+ * kvm_arch_vcpu_ioctl_run
+ * kvm_vcpu_ioctl
+ * do_vfs_ioctl
+ * ksys_ioctl
+ * __x64_sys_ioctl
+ * do_syscall_64
+ * entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/vmx/vmx.c|7493| <<vmx_pre_block>> kvm_lapic_switch_to_sw_timer(vcpu);
+ *
+ * kvm_arch_vcpu_ioctl_run()
+ * -> vcpu_run()
+ * -> vcpu_block()
+ * -> kvm_x86_ops->pre_block() = vmx_pre_block()
+ * -> kvm_lapic_switch_to_sw_timer()
+ * -> kvm_vcpu_block()
+ * -> kvm_x86_ops->post_block = vmx_post_block()
+ * -> kvm_lapic_switch_to_hv_timer()
+ */
void kvm_lapic_switch_to_sw_timer(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
preempt_disable();
/* Possibly the TSC deadline timer is not enabled yet */
+ /*
+ * 主要在以下设置kvm_timer->hv_timer_in_use:
+ * - arch/x86/kvm/lapic.c|1790| <<cancel_hv_timer>> apic->lapic_timer.hv_timer_in_use = false;
+ * - arch/x86/kvm/lapic.c|1813| <<start_hv_timer>> ktimer->hv_timer_in_use = true;
+ */
if (apic->lapic_timer.hv_timer_in_use)
start_sw_timer(apic);
preempt_enable();
@@ -1825,6 +2359,12 @@ void kvm_lapic_restart_hv_timer(struct kvm_vcpu *vcpu)
restart_apic_timer(apic);
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|2043| <<kvm_lapic_reg_write>> start_apic_timer(apic);
+ * - arch/x86/kvm/lapic.c|2180| <<kvm_set_lapic_tscdeadline_msr>> start_apic_timer(apic);
+ * - arch/x86/kvm/lapic.c|2605| <<kvm_apic_set_state>> start_apic_timer(apic);
+ */
static void start_apic_timer(struct kvm_lapic *apic)
{
atomic_set(&apic->lapic_timer.pending, 0);
@@ -2113,6 +2653,13 @@ u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
return (tpr & 0xf0) >> 4;
}
+/*
+ * called by:
+ * - arch/x86/kvm/lapic.c|2259| <<kvm_lapic_reset>> kvm_lapic_set_base(vcpu, APIC_DEFAULT_PHYS_BASE |
+ * - arch/x86/kvm/lapic.c|2294| <<kvm_lapic_reset>> kvm_lapic_set_base(vcpu,
+ * - arch/x86/kvm/lapic.c|2561| <<kvm_apic_set_state>> kvm_lapic_set_base(vcpu, vcpu->arch.apic_base);
+ * - arch/x86/kvm/x86.c|375| <<kvm_set_apic_base>> kvm_lapic_set_base(vcpu, msr_info->data);
+ */
void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
{
u64 old_value = vcpu->arch.apic_base;
@@ -2169,6 +2716,29 @@ void kvm_apic_update_apicv(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_apic_update_apicv);
+/*
+ * [0] kvm_lapic_reset
+ * [0] kvm_arch_vcpu_setup
+ * [0] kvm_vm_ioctl
+ * [0] do_vfs_ioctl
+ * [0] ksys_ioctl
+ * [0] __x64_sys_ioctl
+ * [0] do_syscall_64
+ * [0] entry_SYSCALL_64_after_hwframe
+ *
+ * [0] kvm_lapic_reset
+ * [0] kvm_apic_accept_events
+ * [0] kvm_arch_vcpu_ioctl_run
+ * [0] kvm_vcpu_ioctl
+ * [0] do_vfs_ioctl
+ * [0] ksys_ioctl
+ * [0] __x64_sys_ioctl
+ * [0] do_syscall_64
+ * [0] entry_SYSCALL_64_after_hwframe
+ *
+ * called by:
+ * - arch/x86/kvm/x86.c|9320| <<kvm_vcpu_reset>> kvm_lapic_reset(vcpu, init_event);
+ */
void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
{
struct kvm_lapic *apic = vcpu->arch.apic;