From d1ebdbf99a3ce90f3b886c2cf0dfd7da17703d2a Mon Sep 17 00:00:00 2001 From: James Sullivan Date: Wed, 18 Mar 2015 19:26:04 -0600 Subject: [PATCH] kvm: x86: Deliver MSI IRQ to only lowest prio cpu if msi_redir_hint is true MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit An MSI interrupt should only be delivered to the lowest priority CPU when it has RH=1, regardless of the delivery mode. Modified kvm_is_dm_lowest_prio() to check for either irq->delivery_mode == APIC_DM_LOWPRI or irq->msi_redir_hint. Moved kvm_is_dm_lowest_prio() into lapic.h and renamed to kvm_lowest_prio_delivery(). Changed a check in kvm_irq_delivery_to_apic_fast() from irq->delivery_mode == APIC_DM_LOWPRI to kvm_is_dm_lowest_prio(). Signed-off-by: James Sullivan Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/irq_comm.c | 11 ++++------- arch/x86/kvm/lapic.c | 2 +- arch/x86/kvm/lapic.h | 6 ++++++ 3 files changed, 11 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 80c10af2bf46..9efff9e5b58c 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -31,6 +31,8 @@ #include "ioapic.h" +#include "lapic.h" + static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level, bool line_status) @@ -48,11 +50,6 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, line_status); } -inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq) -{ - return irq->delivery_mode == APIC_DM_LOWEST; -} - int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, struct kvm_lapic_irq *irq, unsigned long *dest_map) { @@ -60,7 +57,7 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, struct kvm_vcpu *vcpu, *lowest = NULL; if (irq->dest_mode == 0 && irq->dest_id == 0xff && - kvm_is_dm_lowest_prio(irq)) { + kvm_lowest_prio_delivery(irq)) { printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); irq->delivery_mode = APIC_DM_FIXED; } @@ -76,7 +73,7 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, irq->dest_id, irq->dest_mode)) continue; - if (!kvm_is_dm_lowest_prio(irq)) { + if (!kvm_lowest_prio_delivery(irq)) { if (r < 0) r = 0; r += kvm_apic_set_irq(vcpu, irq, dest_map); diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 2573b29bbbb3..dc5b57bb1f76 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -728,7 +728,7 @@ bool kvm_irq_delivery_to_apic_fast(struct kvm *kvm, struct kvm_lapic *src, dst = map->logical_map[cid]; - if (irq->delivery_mode == APIC_DM_LOWEST) { + if (kvm_lowest_prio_delivery(irq)) { int l = -1; for_each_set_bit(i, &bitmap, 16) { if (!dst[i]) diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index 793f76183e8b..71b150cae5f9 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -153,6 +153,12 @@ static inline bool kvm_apic_has_events(struct kvm_vcpu *vcpu) return vcpu->arch.apic->pending_events; } +static inline bool kvm_lowest_prio_delivery(struct kvm_lapic_irq *irq) +{ + return (irq->delivery_mode == APIC_DM_LOWEST || + irq->msi_redir_hint); +} + bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector); void wait_lapic_expire(struct kvm_vcpu *vcpu); -- 2.20.1