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-rw-r--r--virt/kvm/Kconfig4
-rw-r--r--virt/kvm/async_pf.c27
-rw-r--r--virt/kvm/eventfd.c8
-rw-r--r--virt/kvm/ioapic.c108
-rw-r--r--virt/kvm/kvm_main.c12
5 files changed, 108 insertions, 51 deletions
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index fbe1a48bd629..13f2d19793e3 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -22,6 +22,10 @@ config KVM_MMIO
config KVM_ASYNC_PF
bool
+# Toggle to switch between direct notification and batch job
+config KVM_ASYNC_PF_SYNC
+ bool
+
config HAVE_KVM_MSI
bool
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 8631d9c14320..10df100c4514 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -28,6 +28,21 @@
#include "async_pf.h"
#include <trace/events/kvm.h>
+static inline void kvm_async_page_present_sync(struct kvm_vcpu *vcpu,
+ struct kvm_async_pf *work)
+{
+#ifdef CONFIG_KVM_ASYNC_PF_SYNC
+ kvm_arch_async_page_present(vcpu, work);
+#endif
+}
+static inline void kvm_async_page_present_async(struct kvm_vcpu *vcpu,
+ struct kvm_async_pf *work)
+{
+#ifndef CONFIG_KVM_ASYNC_PF_SYNC
+ kvm_arch_async_page_present(vcpu, work);
+#endif
+}
+
static struct kmem_cache *async_pf_cache;
int kvm_async_pf_init(void)
@@ -69,6 +84,7 @@ static void async_pf_execute(struct work_struct *work)
down_read(&mm->mmap_sem);
get_user_pages(current, mm, addr, 1, 1, 0, NULL, NULL);
up_read(&mm->mmap_sem);
+ kvm_async_page_present_sync(vcpu, apf);
unuse_mm(mm);
spin_lock(&vcpu->async_pf.lock);
@@ -97,11 +113,16 @@ void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu)
list_entry(vcpu->async_pf.queue.next,
typeof(*work), queue);
list_del(&work->queue);
+
+#ifdef CONFIG_KVM_ASYNC_PF_SYNC
+ flush_work(&work->work);
+#else
if (cancel_work_sync(&work->work)) {
mmdrop(work->mm);
kvm_put_kvm(vcpu->kvm); /* == work->vcpu->kvm */
kmem_cache_free(async_pf_cache, work);
}
+#endif
}
spin_lock(&vcpu->async_pf.lock);
@@ -130,7 +151,7 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
spin_unlock(&vcpu->async_pf.lock);
kvm_arch_async_page_ready(vcpu, work);
- kvm_arch_async_page_present(vcpu, work);
+ kvm_async_page_present_async(vcpu, work);
list_del(&work->queue);
vcpu->async_pf.queued--;
@@ -138,7 +159,7 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
}
}
-int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
+int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
struct kvm_arch_async_pf *arch)
{
struct kvm_async_pf *work;
@@ -159,7 +180,7 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
work->wakeup_all = false;
work->vcpu = vcpu;
work->gva = gva;
- work->addr = gfn_to_hva(vcpu->kvm, gfn);
+ work->addr = hva;
work->arch = *arch;
work->mm = current->mm;
atomic_inc(&work->mm->mm_count);
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index abe4d6043b36..29c2a04e036e 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -391,19 +391,19 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
lockdep_is_held(&kvm->irqfds.lock));
irqfd_update(kvm, irqfd, irq_rt);
- events = f.file->f_op->poll(f.file, &irqfd->pt);
-
list_add_tail(&irqfd->list, &kvm->irqfds.items);
+ spin_unlock_irq(&kvm->irqfds.lock);
+
/*
* Check if there was an event already pending on the eventfd
* before we registered, and trigger it as if we didn't miss it.
*/
+ events = f.file->f_op->poll(f.file, &irqfd->pt);
+
if (events & POLLIN)
schedule_work(&irqfd->inject);
- spin_unlock_irq(&kvm->irqfds.lock);
-
/*
* do not drop the file until the irqfd is fully initialized, otherwise
* we might race against the POLLHUP
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index ce9ed99ad7dc..d4b601547f1f 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -50,7 +50,7 @@
#else
#define ioapic_debug(fmt, arg...)
#endif
-static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq,
+static int ioapic_service(struct kvm_ioapic *vioapic, int irq,
bool line_status);
static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
@@ -163,23 +163,67 @@ static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic)
return false;
}
-static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx,
- bool line_status)
+static int ioapic_set_irq(struct kvm_ioapic *ioapic, unsigned int irq,
+ int irq_level, bool line_status)
{
- union kvm_ioapic_redirect_entry *pent;
- int injected = -1;
+ union kvm_ioapic_redirect_entry entry;
+ u32 mask = 1 << irq;
+ u32 old_irr;
+ int edge, ret;
- pent = &ioapic->redirtbl[idx];
+ entry = ioapic->redirtbl[irq];
+ edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
- if (!pent->fields.mask) {
- injected = ioapic_deliver(ioapic, idx, line_status);
- if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
- pent->fields.remote_irr = 1;
+ if (!irq_level) {
+ ioapic->irr &= ~mask;
+ ret = 1;
+ goto out;
+ }
+
+ /*
+ * Return 0 for coalesced interrupts; for edge-triggered interrupts,
+ * this only happens if a previous edge has not been delivered due
+ * do masking. For level interrupts, the remote_irr field tells
+ * us if the interrupt is waiting for an EOI.
+ *
+ * RTC is special: it is edge-triggered, but userspace likes to know
+ * if it has been already ack-ed via EOI because coalesced RTC
+ * interrupts lead to time drift in Windows guests. So we track
+ * EOI manually for the RTC interrupt.
+ */
+ if (irq == RTC_GSI && line_status &&
+ rtc_irq_check_coalesced(ioapic)) {
+ ret = 0;
+ goto out;
}
- return injected;
+ old_irr = ioapic->irr;
+ ioapic->irr |= mask;
+ if ((edge && old_irr == ioapic->irr) ||
+ (!edge && entry.fields.remote_irr)) {
+ ret = 0;
+ goto out;
+ }
+
+ ret = ioapic_service(ioapic, irq, line_status);
+
+out:
+ trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
+ return ret;
+}
+
+static void kvm_ioapic_inject_all(struct kvm_ioapic *ioapic, unsigned long irr)
+{
+ u32 idx;
+
+ rtc_irq_eoi_tracking_reset(ioapic);
+ for_each_set_bit(idx, &irr, IOAPIC_NUM_PINS)
+ ioapic_set_irq(ioapic, idx, 1, true);
+
+ kvm_rtc_eoi_tracking_restore_all(ioapic);
}
+
static void update_handled_vectors(struct kvm_ioapic *ioapic)
{
DECLARE_BITMAP(handled_vectors, 256);
@@ -282,12 +326,15 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
}
}
-static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
+static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
{
union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
struct kvm_lapic_irq irqe;
int ret;
+ if (entry->fields.mask)
+ return -1;
+
ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
"vector=%x trig_mode=%x\n",
entry->fields.dest_id, entry->fields.dest_mode,
@@ -302,6 +349,9 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
irqe.level = 1;
irqe.shorthand = 0;
+ if (irqe.trig_mode == IOAPIC_EDGE_TRIG)
+ ioapic->irr &= ~(1 << irq);
+
if (irq == RTC_GSI && line_status) {
BUG_ON(ioapic->rtc_status.pending_eoi != 0);
ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
@@ -310,45 +360,24 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
} else
ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
+ if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
+ entry->fields.remote_irr = 1;
+
return ret;
}
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
int level, bool line_status)
{
- u32 old_irr;
- u32 mask = 1 << irq;
- union kvm_ioapic_redirect_entry entry;
int ret, irq_level;
BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
spin_lock(&ioapic->lock);
- old_irr = ioapic->irr;
irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
irq_source_id, level);
- entry = ioapic->redirtbl[irq];
- irq_level ^= entry.fields.polarity;
- if (!irq_level) {
- ioapic->irr &= ~mask;
- ret = 1;
- } else {
- int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
+ ret = ioapic_set_irq(ioapic, irq, irq_level, line_status);
- if (irq == RTC_GSI && line_status &&
- rtc_irq_check_coalesced(ioapic)) {
- ret = 0; /* coalesced */
- goto out;
- }
- ioapic->irr |= mask;
- if ((edge && old_irr != ioapic->irr) ||
- (!edge && !entry.fields.remote_irr))
- ret = ioapic_service(ioapic, irq, line_status);
- else
- ret = 0; /* report coalesced interrupt */
- }
-out:
- trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
spin_unlock(&ioapic->lock);
return ret;
@@ -394,7 +423,7 @@ static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
ent->fields.remote_irr = 0;
- if (!ent->fields.mask && (ioapic->irr & (1 << i)))
+ if (ioapic->irr & (1 << i))
ioapic_service(ioapic, i, false);
}
}
@@ -595,9 +624,10 @@ int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
spin_lock(&ioapic->lock);
memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
+ ioapic->irr = 0;
update_handled_vectors(ioapic);
kvm_vcpu_request_scan_ioapic(kvm);
- kvm_rtc_eoi_tracking_restore_all(ioapic);
+ kvm_ioapic_inject_all(ioapic, state->irr);
spin_unlock(&ioapic->lock);
return 0;
}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b5ec7fb986f6..56baae8c2f56 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -186,12 +186,9 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
void kvm_flush_remote_tlbs(struct kvm *kvm)
{
- long dirty_count = kvm->tlbs_dirty;
-
- smp_mb();
if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
++kvm->stat.remote_tlb_flush;
- cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
+ kvm->tlbs_dirty = false;
}
EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
@@ -1804,7 +1801,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
continue;
if (vcpu == me)
continue;
- if (waitqueue_active(&vcpu->wq))
+ if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
continue;
if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
continue;
@@ -2284,6 +2281,11 @@ static int kvm_ioctl_create_device(struct kvm *kvm,
ops = &kvm_arm_vgic_v2_ops;
break;
#endif
+#ifdef CONFIG_S390
+ case KVM_DEV_TYPE_FLIC:
+ ops = &kvm_flic_ops;
+ break;
+#endif
default:
return -ENODEV;
}
generated by cgit (git 2.34.1) at 2024-05-29 01:25:56 +0000