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| author | Joerg Roedel <jroedel@suse.de> | 2016-02-29 16:04:45 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-03 14:36:18 +0100 |
| commit | 4d99ba898dd0c521ca6cdfdde55c9b58aea3cb3d (patch) | |
| tree | 3019e11a4187a786fd4b51f5fc8305acffa89e3f /arch/x86/kvm/ioapic.c | |
| parent | kvm: x86: Track irq vectors in ioapic->rtc_status.dest_map (diff) | |
| download | linux-4d99ba898dd0c521ca6cdfdde55c9b58aea3cb3d.tar.xz linux-4d99ba898dd0c521ca6cdfdde55c9b58aea3cb3d.zip | |
kvm: x86: Check dest_map->vector to match eoi signals for rtc
Using the vector stored at interrupt delivery makes the eoi
matching safe agains irq migration in the ioapic.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/ioapic.c')
| -rw-r--r-- | arch/x86/kvm/ioapic.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c index f2c9906c5849..9db47090ead0 100644 --- a/arch/x86/kvm/ioapic.c +++ b/arch/x86/kvm/ioapic.c @@ -237,10 +237,17 @@ static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr) void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, ulong *ioapic_handled_vectors) { struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic; + struct dest_map *dest_map = &ioapic->rtc_status.dest_map; union kvm_ioapic_redirect_entry *e; int index; spin_lock(&ioapic->lock); + + /* Make sure we see any missing RTC EOI */ + if (test_bit(vcpu->vcpu_id, dest_map->map)) + __set_bit(dest_map->vectors[vcpu->vcpu_id], + ioapic_handled_vectors); + for (index = 0; index < IOAPIC_NUM_PINS; index++) { e = &ioapic->redirtbl[index]; if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG || @@ -408,8 +415,14 @@ static void kvm_ioapic_eoi_inject_work(struct work_struct *work) static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, struct kvm_ioapic *ioapic, int vector, int trigger_mode) { - int i; + struct dest_map *dest_map = &ioapic->rtc_status.dest_map; struct kvm_lapic *apic = vcpu->arch.apic; + int i; + + /* RTC special handling */ + if (test_bit(vcpu->vcpu_id, dest_map->map) && + vector == dest_map->vectors[vcpu->vcpu_id]) + rtc_irq_eoi(ioapic, vcpu); for (i = 0; i < IOAPIC_NUM_PINS; i++) { union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i]; @@ -417,8 +430,6 @@ static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, if (ent->fields.vector != vector) continue; - if (i == RTC_GSI) - rtc_irq_eoi(ioapic, vcpu); /* * We are dropping lock while calling ack notifiers because ack * notifier callbacks for assigned devices call into IOAPIC |