From 520040146a0af36f7875ec06b58f44b19a0edf53 Mon Sep 17 00:00:00 2001 From: Feng Wu Date: Mon, 25 Jan 2016 16:53:33 +0800 Subject: KVM: x86: Use vector-hashing to deliver lowest-priority interrupts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Use vector-hashing to deliver lowest-priority interrupts, As an example, modern Intel CPUs in server platform use this method to handle lowest-priority interrupts. Signed-off-by: Feng Wu Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/lapic.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 47 insertions(+), 3 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 36591faed13b..1a4ca1d05fe9 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -675,6 +675,22 @@ bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source, } } +int kvm_vector_to_index(u32 vector, u32 dest_vcpus, + const unsigned long *bitmap, u32 bitmap_size) +{ + u32 mod; + int i, idx = -1; + + mod = vector % dest_vcpus; + + for (i = 0; i <= mod; i++) { + idx = find_next_bit(bitmap, bitmap_size, idx + 1); + BUG_ON(idx == bitmap_size); + } + + return idx; +} + bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map) { @@ -727,21 +743,49 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, dst = map->logical_map[cid]; - if (kvm_lowest_prio_delivery(irq)) { + if (!kvm_lowest_prio_delivery(irq)) + goto set_irq; + + if (!kvm_vector_hashing_enabled()) { int l = -1; for_each_set_bit(i, &bitmap, 16) { if (!dst[i]) continue; if (l < 0) l = i; - else if (kvm_apic_compare_prio(dst[i]->vcpu, dst[l]->vcpu) < 0) + else if (kvm_apic_compare_prio(dst[i]->vcpu, + dst[l]->vcpu) < 0) l = i; } - bitmap = (l >= 0) ? 1 << l : 0; + } else { + int idx; + unsigned int dest_vcpus; + + dest_vcpus = hweight16(bitmap); + if (dest_vcpus == 0) + goto out; + + idx = kvm_vector_to_index(irq->vector, + dest_vcpus, &bitmap, 16); + + /* + * We may find a hardware disabled LAPIC here, if that + * is the case, print out a error message once for each + * guest and return. + */ + if (!dst[idx] && !kvm->arch.disabled_lapic_found) { + kvm->arch.disabled_lapic_found = true; + printk(KERN_INFO + "Disabled LAPIC found during irq injection\n"); + goto out; + } + + bitmap = (idx >= 0) ? 1 << idx : 0; } } +set_irq: for_each_set_bit(i, &bitmap, 16) { if (!dst[i]) continue; -- cgit v1.2.3 From 6228a0da805792c2f25b32e9b926d0810a6648ab Mon Sep 17 00:00:00 2001 From: Feng Wu Date: Mon, 25 Jan 2016 16:53:34 +0800 Subject: KVM: x86: Add lowest-priority support for vt-d posted-interrupts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Use vector-hashing to deliver lowest-priority interrupts for VT-d posted-interrupts. This patch extends kvm_intr_is_single_vcpu() to support lowest-priority handling. Signed-off-by: Feng Wu Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/lapic.c | 56 +++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 49 insertions(+), 7 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 1a4ca1d05fe9..1520d1acd0ad 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -798,6 +798,20 @@ out: return ret; } +/* + * This routine tries to handler interrupts in posted mode, here is how + * it deals with different cases: + * - For single-destination interrupts, handle it in posted mode + * - Else if vector hashing is enabled and it is a lowest-priority + * interrupt, handle it in posted mode and use the following mechanism + * to find the destinaiton vCPU. + * 1. For lowest-priority interrupts, store all the possible + * destination vCPUs in an array. + * 2. Use "guest vector % max number of destination vCPUs" to find + * the right destination vCPU in the array for the lowest-priority + * 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) { @@ -839,16 +853,44 @@ bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq, if (cid >= ARRAY_SIZE(map->logical_map)) goto out; - for_each_set_bit(i, &bitmap, 16) { - dst = map->logical_map[cid][i]; - if (++r == 2) + if (kvm_vector_hashing_enabled() && + kvm_lowest_prio_delivery(irq)) { + int idx; + unsigned int dest_vcpus; + + dest_vcpus = hweight16(bitmap); + if (dest_vcpus == 0) goto out; - } - if (dst && kvm_apic_present(dst->vcpu)) + idx = kvm_vector_to_index(irq->vector, dest_vcpus, + &bitmap, 16); + + /* + * We may find a hardware disabled LAPIC here, if that + * is the case, print out a error message once for each + * guest and return + */ + dst = map->logical_map[cid][idx]; + if (!dst && !kvm->arch.disabled_lapic_found) { + kvm->arch.disabled_lapic_found = true; + printk(KERN_INFO + "Disabled LAPIC found during irq injection\n"); + goto out; + } + *dest_vcpu = dst->vcpu; - else - goto out; + } else { + for_each_set_bit(i, &bitmap, 16) { + dst = map->logical_map[cid][i]; + if (++r == 2) + goto out; + } + + if (dst && kvm_apic_present(dst->vcpu)) + *dest_vcpu = dst->vcpu; + else + goto out; + } } ret = true; -- cgit v1.2.3 From f8543d6a977a1bdb37eb13ad81ef2874526209b0 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 8 Jan 2016 13:42:24 +0100 Subject: KVM: APIC: remove unnecessary double checks on APIC existence MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Usually the in-kernel APIC's existence is checked in the caller. Do not bother checking it again in lapic.c. Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/lapic.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 1520d1acd0ad..b1029051f664 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -475,18 +475,12 @@ static inline void apic_clear_isr(int vec, struct kvm_lapic *apic) int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu) { - int highest_irr; - /* This may race with setting of irr in __apic_accept_irq() and * value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq * will cause vmexit immediately and the value will be recalculated * on the next vmentry. */ - if (!kvm_vcpu_has_lapic(vcpu)) - return 0; - highest_irr = apic_find_highest_irr(vcpu->arch.apic); - - return highest_irr; + return apic_find_highest_irr(vcpu->arch.apic); } static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, @@ -1601,8 +1595,7 @@ static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this, void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu) { - if (kvm_vcpu_has_lapic(vcpu)) - apic_reg_write(vcpu->arch.apic, APIC_EOI, 0); + apic_reg_write(vcpu->arch.apic, APIC_EOI, 0); } EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi); @@ -1676,9 +1669,6 @@ void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!kvm_vcpu_has_lapic(vcpu)) - return; - apic_set_tpr(apic, ((cr8 & 0x0f) << 4) | (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4)); } @@ -1687,9 +1677,6 @@ u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu) { u64 tpr; - if (!kvm_vcpu_has_lapic(vcpu)) - return 0; - tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI); return (tpr & 0xf0) >> 4; @@ -1912,7 +1899,7 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu) struct kvm_lapic *apic = vcpu->arch.apic; int highest_irr; - if (!kvm_vcpu_has_lapic(vcpu) || !apic_enabled(apic)) + if (!apic_enabled(apic)) return -1; apic_update_ppr(apic); -- cgit v1.2.3 From 1e3161b4147caf2045ac4aae3d71fae6ac1a1d65 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 8 Jan 2016 13:41:16 +0100 Subject: KVM: x86: consolidate "has lapic" checks into irq.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Do for kvm_cpu_has_pending_timer and kvm_inject_pending_timer_irqs what the other irq.c routines have been doing. Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/irq.c | 9 ++++++--- arch/x86/kvm/lapic.c | 6 +----- 2 files changed, 7 insertions(+), 8 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c index 3982b479bb5f..95fcc7b13866 100644 --- a/arch/x86/kvm/irq.c +++ b/arch/x86/kvm/irq.c @@ -33,7 +33,10 @@ */ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) { - return apic_has_pending_timer(vcpu); + if (lapic_in_kernel(vcpu)) + return apic_has_pending_timer(vcpu); + + return 0; } EXPORT_SYMBOL(kvm_cpu_has_pending_timer); @@ -137,8 +140,8 @@ EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt); void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu) { - kvm_inject_apic_timer_irqs(vcpu); - /* TODO: PIT, RTC etc. */ + if (lapic_in_kernel(vcpu)) + kvm_inject_apic_timer_irqs(vcpu); } EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs); diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index b1029051f664..57e3f27bdadb 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1801,8 +1801,7 @@ int apic_has_pending_timer(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; - if (kvm_vcpu_has_lapic(vcpu) && apic_enabled(apic) && - apic_lvt_enabled(apic, APIC_LVTT)) + if (apic_enabled(apic) && apic_lvt_enabled(apic, APIC_LVTT)) return atomic_read(&apic->lapic_timer.pending); return 0; @@ -1927,9 +1926,6 @@ void kvm_inject_apic_timer_irqs(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!kvm_vcpu_has_lapic(vcpu)) - return; - if (atomic_read(&apic->lapic_timer.pending) > 0) { kvm_apic_local_deliver(apic, APIC_LVTT); if (apic_lvtt_tscdeadline(apic)) -- cgit v1.2.3 From bce87cce88c71957c56479809db8316a836ec8b1 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 8 Jan 2016 13:48:51 +0100 Subject: KVM: x86: consolidate different ways to test for in-kernel LAPIC MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Different pieces of code checked for vcpu->arch.apic being (non-)NULL, or used kvm_vcpu_has_lapic (more optimized) or lapic_in_kernel. Replace everything with lapic_in_kernel's name and kvm_vcpu_has_lapic's implementation. Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/irq.h | 8 -------- arch/x86/kvm/lapic.c | 16 ++++++++-------- arch/x86/kvm/lapic.h | 8 ++++---- arch/x86/kvm/pmu.c | 2 +- arch/x86/kvm/x86.c | 17 +++++++++-------- 5 files changed, 22 insertions(+), 29 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h index ae5c78f2337d..61ebdc13a29a 100644 --- a/arch/x86/kvm/irq.h +++ b/arch/x86/kvm/irq.h @@ -109,14 +109,6 @@ static inline int irqchip_in_kernel(struct kvm *kvm) return ret; } -static inline int lapic_in_kernel(struct kvm_vcpu *vcpu) -{ - /* Same as irqchip_in_kernel(vcpu->kvm), but with less - * pointer chasing and no unnecessary memory barriers. - */ - return vcpu->arch.apic != NULL; -} - void kvm_pic_reset(struct kvm_kpic_state *s); 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 57e3f27bdadb..1482a581a83c 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -281,7 +281,7 @@ void kvm_apic_set_version(struct kvm_vcpu *vcpu) struct kvm_cpuid_entry2 *feat; u32 v = APIC_VERSION; - if (!kvm_vcpu_has_lapic(vcpu)) + if (!lapic_in_kernel(vcpu)) return; feat = kvm_find_cpuid_entry(apic->vcpu, 0x1, 0); @@ -1319,7 +1319,7 @@ void wait_lapic_expire(struct kvm_vcpu *vcpu) struct kvm_lapic *apic = vcpu->arch.apic; u64 guest_tsc, tsc_deadline; - if (!kvm_vcpu_has_lapic(vcpu)) + if (!lapic_in_kernel(vcpu)) return; if (apic->lapic_timer.expired_tscdeadline == 0) @@ -1645,7 +1645,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) || + if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) || apic_lvtt_period(apic)) return 0; @@ -1656,7 +1656,7 @@ void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!kvm_vcpu_has_lapic(vcpu) || apic_lvtt_oneshot(apic) || + if (!lapic_in_kernel(vcpu) || apic_lvtt_oneshot(apic) || apic_lvtt_period(apic)) return; @@ -2001,7 +2001,7 @@ void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu) { struct hrtimer *timer; - if (!kvm_vcpu_has_lapic(vcpu)) + if (!lapic_in_kernel(vcpu)) return; timer = &vcpu->arch.apic->lapic_timer.timer; @@ -2174,7 +2174,7 @@ int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data) { struct kvm_lapic *apic = vcpu->arch.apic; - if (!kvm_vcpu_has_lapic(vcpu)) + if (!lapic_in_kernel(vcpu)) return 1; /* if this is ICR write vector before command */ @@ -2188,7 +2188,7 @@ int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 reg, u64 *data) struct kvm_lapic *apic = vcpu->arch.apic; u32 low, high = 0; - if (!kvm_vcpu_has_lapic(vcpu)) + if (!lapic_in_kernel(vcpu)) return 1; if (apic_reg_read(apic, reg, 4, &low)) @@ -2220,7 +2220,7 @@ void kvm_apic_accept_events(struct kvm_vcpu *vcpu) u8 sipi_vector; unsigned long pe; - if (!kvm_vcpu_has_lapic(vcpu) || !apic->pending_events) + if (!lapic_in_kernel(vcpu) || !apic->pending_events) return; /* diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index afccf4099b00..59610099af04 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -103,7 +103,7 @@ static inline u32 kvm_apic_get_reg(struct kvm_lapic *apic, int reg_off) extern struct static_key kvm_no_apic_vcpu; -static inline bool kvm_vcpu_has_lapic(struct kvm_vcpu *vcpu) +static inline bool lapic_in_kernel(struct kvm_vcpu *vcpu) { if (static_key_false(&kvm_no_apic_vcpu)) return vcpu->arch.apic; @@ -130,7 +130,7 @@ static inline bool kvm_apic_sw_enabled(struct kvm_lapic *apic) static inline bool kvm_apic_present(struct kvm_vcpu *vcpu) { - return kvm_vcpu_has_lapic(vcpu) && kvm_apic_hw_enabled(vcpu->arch.apic); + return lapic_in_kernel(vcpu) && kvm_apic_hw_enabled(vcpu->arch.apic); } static inline int kvm_lapic_enabled(struct kvm_vcpu *vcpu) @@ -150,7 +150,7 @@ static inline bool kvm_vcpu_apicv_active(struct kvm_vcpu *vcpu) static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu) { - return kvm_vcpu_has_lapic(vcpu) && vcpu->arch.apic->pending_events; + return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events; } static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq) @@ -161,7 +161,7 @@ static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq) static inline int kvm_lapic_latched_init(struct kvm_vcpu *vcpu) { - return kvm_vcpu_has_lapic(vcpu) && test_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); + return lapic_in_kernel(vcpu) && test_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); } static inline int kvm_apic_id(struct kvm_lapic *apic) diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index 31aa2c85dc97..06ce377dcbc9 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -257,7 +257,7 @@ int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned idx, u64 *data) void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu) { - if (vcpu->arch.apic) + if (lapic_in_kernel(vcpu)) kvm_apic_local_deliver(vcpu->arch.apic, APIC_LVTPC); } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index aafbcf9f9776..ee3e990d519a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2984,7 +2984,7 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR && - kvm_vcpu_has_lapic(vcpu)) + lapic_in_kernel(vcpu)) vcpu->arch.apic->sipi_vector = events->sipi_vector; if (events->flags & KVM_VCPUEVENT_VALID_SMM) { @@ -2997,7 +2997,7 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; else vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK; - if (kvm_vcpu_has_lapic(vcpu)) { + if (lapic_in_kernel(vcpu)) { if (events->smi.latched_init) set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); else @@ -3237,7 +3237,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp, switch (ioctl) { case KVM_GET_LAPIC: { r = -EINVAL; - if (!vcpu->arch.apic) + if (!lapic_in_kernel(vcpu)) goto out; u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL); @@ -3255,7 +3255,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp, } case KVM_SET_LAPIC: { r = -EINVAL; - if (!vcpu->arch.apic) + if (!lapic_in_kernel(vcpu)) goto out; u.lapic = memdup_user(argp, sizeof(*u.lapic)); if (IS_ERR(u.lapic)) @@ -4090,7 +4090,7 @@ static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len, do { n = min(len, 8); - if (!(vcpu->arch.apic && + if (!(lapic_in_kernel(vcpu) && !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v)) && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v)) break; @@ -4110,7 +4110,7 @@ static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) do { n = min(len, 8); - if (!(vcpu->arch.apic && + if (!(lapic_in_kernel(vcpu) && !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev, addr, n, v)) && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v)) @@ -6007,7 +6007,7 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu) if (!kvm_x86_ops->update_cr8_intercept) return; - if (!vcpu->arch.apic) + if (!lapic_in_kernel(vcpu)) return; if (vcpu->arch.apicv_active) @@ -7035,7 +7035,7 @@ int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, struct kvm_mp_state *mp_state) { - if (!kvm_vcpu_has_lapic(vcpu) && + if (!lapic_in_kernel(vcpu) && mp_state->mp_state != KVM_MP_STATE_RUNNABLE) return -EINVAL; @@ -7590,6 +7590,7 @@ bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) } struct static_key kvm_no_apic_vcpu __read_mostly; +EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu); int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { -- cgit v1.2.3 From 4efd805fca5590af181f89ad122b8695c63b5f2c Mon Sep 17 00:00:00 2001 From: Radim Krčmář Date: Fri, 12 Feb 2016 15:00:15 +0100 Subject: KVM: x86: fix *NULL on invalid low-prio irq MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Smatch noticed a NULL dereference in kvm_intr_is_single_vcpu_fast that happens if VM already warned about invalid lowest-priority interrupt. Create a function for common code while fixing it. Fixes: 6228a0da8057 ("KVM: x86: Add lowest-priority support for vt-d posted-interrupts") Reported-by: Dan Carpenter Signed-off-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/lapic.c | 31 +++++++++++++------------------ 1 file changed, 13 insertions(+), 18 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 1482a581a83c..cf74404230ca 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -685,6 +685,15 @@ int kvm_vector_to_index(u32 vector, u32 dest_vcpus, return idx; } +static void kvm_apic_disabled_lapic_found(struct kvm *kvm) +{ + if (!kvm->arch.disabled_lapic_found) { + kvm->arch.disabled_lapic_found = true; + printk(KERN_INFO + "Disabled LAPIC found during irq injection\n"); + } +} + bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map) { @@ -763,15 +772,8 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, idx = kvm_vector_to_index(irq->vector, dest_vcpus, &bitmap, 16); - /* - * We may find a hardware disabled LAPIC here, if that - * is the case, print out a error message once for each - * guest and return. - */ - if (!dst[idx] && !kvm->arch.disabled_lapic_found) { - kvm->arch.disabled_lapic_found = true; - printk(KERN_INFO - "Disabled LAPIC found during irq injection\n"); + if (!dst[idx]) { + kvm_apic_disabled_lapic_found(kvm); goto out; } @@ -859,16 +861,9 @@ bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq, idx = kvm_vector_to_index(irq->vector, dest_vcpus, &bitmap, 16); - /* - * We may find a hardware disabled LAPIC here, if that - * is the case, print out a error message once for each - * guest and return - */ dst = map->logical_map[cid][idx]; - if (!dst && !kvm->arch.disabled_lapic_found) { - kvm->arch.disabled_lapic_found = true; - printk(KERN_INFO - "Disabled LAPIC found during irq injection\n"); + if (!dst) { + kvm_apic_disabled_lapic_found(kvm); goto out; } -- cgit v1.2.3 From 9e4aabe2bb3454c83dac8139cf9974503ee044db Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 29 Feb 2016 16:04:43 +0100 Subject: kvm: x86: Convert ioapic->rtc_status.dest_map to a struct Currently this is a bitmap which tracks which CPUs we expect an EOI from. Move this bitmap to a struct so that we can track additional information there. Signed-off-by: Joerg Roedel Signed-off-by: Paolo Bonzini --- arch/x86/kvm/ioapic.c | 13 +++++++------ arch/x86/kvm/ioapic.h | 10 ++++++++-- arch/x86/kvm/irq_comm.c | 2 +- arch/x86/kvm/lapic.c | 10 +++++----- arch/x86/kvm/lapic.h | 7 +++++-- 5 files changed, 26 insertions(+), 16 deletions(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c index 1facfd60b04a..f2c9906c5849 100644 --- a/arch/x86/kvm/ioapic.c +++ b/arch/x86/kvm/ioapic.c @@ -94,7 +94,7 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic, static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic) { ioapic->rtc_status.pending_eoi = 0; - bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS); + bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPUS); } static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic); @@ -117,16 +117,16 @@ static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu) return; new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector); - old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); + old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map.map); if (new_val == old_val) return; if (new_val) { - __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); + __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map.map); ioapic->rtc_status.pending_eoi++; } else { - __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map); + __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map.map); ioapic->rtc_status.pending_eoi--; rtc_status_pending_eoi_check_valid(ioapic); } @@ -156,7 +156,8 @@ static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic) static void rtc_irq_eoi(struct kvm_ioapic *ioapic, struct kvm_vcpu *vcpu) { - if (test_and_clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map)) { + if (test_and_clear_bit(vcpu->vcpu_id, + ioapic->rtc_status.dest_map.map)) { --ioapic->rtc_status.pending_eoi; rtc_status_pending_eoi_check_valid(ioapic); } @@ -346,7 +347,7 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status) */ BUG_ON(ioapic->rtc_status.pending_eoi != 0); ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, - ioapic->rtc_status.dest_map); + &ioapic->rtc_status.dest_map); ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret); } else ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL); diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h index 2d16dc251d81..af729890f6f5 100644 --- a/arch/x86/kvm/ioapic.h +++ b/arch/x86/kvm/ioapic.h @@ -40,9 +40,14 @@ struct kvm_vcpu; #define RTC_GSI -1U #endif +struct dest_map { + DECLARE_BITMAP(map, KVM_MAX_VCPUS); +}; + + struct rtc_status { int pending_eoi; - DECLARE_BITMAP(dest_map, KVM_MAX_VCPUS); + struct dest_map dest_map; }; union kvm_ioapic_redirect_entry { @@ -118,7 +123,8 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id, int level, bool line_status); void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id); int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, - struct kvm_lapic_irq *irq, unsigned long *dest_map); + struct kvm_lapic_irq *irq, + struct dest_map *dest_map); 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_scan_entry(struct kvm_vcpu *vcpu, diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 37217363887d..54ead79e444b 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -54,7 +54,7 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, } int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, - struct kvm_lapic_irq *irq, unsigned long *dest_map) + struct kvm_lapic_irq *irq, struct dest_map *dest_map) { int i, r = -1; struct kvm_vcpu *vcpu, *lowest = NULL; diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index cf74404230ca..e085695e6b5a 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -485,10 +485,10 @@ int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu) static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, int vector, int level, int trig_mode, - unsigned long *dest_map); + struct dest_map *dest_map); int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq, - unsigned long *dest_map) + struct dest_map *dest_map) { struct kvm_lapic *apic = vcpu->arch.apic; @@ -695,7 +695,7 @@ static void kvm_apic_disabled_lapic_found(struct kvm *kvm) } bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, - struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map) + struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map) { struct kvm_apic_map *map; unsigned long bitmap = 1; @@ -894,7 +894,7 @@ out: */ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, int vector, int level, int trig_mode, - unsigned long *dest_map) + struct dest_map *dest_map) { int result = 0; struct kvm_vcpu *vcpu = apic->vcpu; @@ -915,7 +915,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, result = 1; if (dest_map) - __set_bit(vcpu->vcpu_id, dest_map); + __set_bit(vcpu->vcpu_id, dest_map->map); if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) { if (trig_mode) diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index 59610099af04..f71183e502ee 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -42,6 +42,9 @@ struct kvm_lapic { unsigned long pending_events; unsigned int sipi_vector; }; + +struct dest_map; + int kvm_create_lapic(struct kvm_vcpu *vcpu); void kvm_free_lapic(struct kvm_vcpu *vcpu); @@ -60,11 +63,11 @@ void kvm_apic_set_version(struct kvm_vcpu *vcpu); void __kvm_apic_update_irr(u32 *pir, void *regs); void kvm_apic_update_irr(struct kvm_vcpu *vcpu, u32 *pir); int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq, - unsigned long *dest_map); + struct dest_map *dest_map); int kvm_apic_local_deliver(struct kvm_lapic *apic, int lvt_type); bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, - struct kvm_lapic_irq *irq, int *r, unsigned long *dest_map); + struct kvm_lapic_irq *irq, int *r, struct dest_map *dest_map); u64 kvm_get_apic_base(struct kvm_vcpu *vcpu); int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info); -- cgit v1.2.3 From 9daa50076f585854f0040aa8403eac020d6f5d64 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 29 Feb 2016 16:04:44 +0100 Subject: kvm: x86: Track irq vectors in ioapic->rtc_status.dest_map This allows backtracking later in case the rtc irq has been moved to another vcpu/vector. Signed-off-by: Joerg Roedel Signed-off-by: Paolo Bonzini --- arch/x86/kvm/ioapic.h | 7 +++++++ arch/x86/kvm/lapic.c | 4 +++- 2 files changed, 10 insertions(+), 1 deletion(-) (limited to 'arch/x86/kvm/lapic.c') diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h index af729890f6f5..7d2692a49657 100644 --- a/arch/x86/kvm/ioapic.h +++ b/arch/x86/kvm/ioapic.h @@ -41,7 +41,14 @@ struct kvm_vcpu; #endif struct dest_map { + /* vcpu bitmap where IRQ has been sent */ DECLARE_BITMAP(map, KVM_MAX_VCPUS); + + /* + * Vector sent to a given vcpu, only valid when + * the vcpu's bit in map is set + */ + u8 vectors[KVM_MAX_VCPUS]; }; diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index e085695e6b5a..d9ae1ce2a6a0 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -914,8 +914,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, result = 1; - if (dest_map) + if (dest_map) { __set_bit(vcpu->vcpu_id, dest_map->map); + dest_map->vectors[vcpu->vcpu_id] = vector; + } if (apic_test_vector(vector, apic->regs + APIC_TMR) != !!trig_mode) { if (trig_mode) -- cgit v1.2.3