* [PATCH v2 1/5] Make kvm_apic_set_irq() deliver all kinds of interrupts.
2009-03-05 14:34 [PATCH v2 0/5] ioapic/lapic/msi cleanup Gleb Natapov
@ 2009-03-05 14:34 ` Gleb Natapov
2009-03-05 14:34 ` [PATCH v2 2/5] ioapic/msi interrupt delivery consolidation Gleb Natapov
` (4 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Gleb Natapov @ 2009-03-05 14:34 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
Get rid of ioapic_inj_irq() and ioapic_inj_nmi() functions.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/ia64/include/asm/kvm_host.h | 1 -
arch/ia64/kvm/kvm-ia64.c | 8 +++---
arch/ia64/kvm/lapic.h | 2 +-
arch/x86/kvm/lapic.c | 47 +++++++++++++++++++++++---------------
arch/x86/kvm/lapic.h | 2 +-
virt/kvm/ioapic.c | 40 +++++---------------------------
virt/kvm/irq_comm.c | 1 +
7 files changed, 42 insertions(+), 59 deletions(-)
diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
index 4542651..5608488 100644
--- a/arch/ia64/include/asm/kvm_host.h
+++ b/arch/ia64/include/asm/kvm_host.h
@@ -585,7 +585,6 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu);
int kvm_pal_emul(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
void kvm_sal_emul(struct kvm_vcpu *vcpu);
-static inline void kvm_inject_nmi(struct kvm_vcpu *vcpu) {}
#endif /* __ASSEMBLY__*/
#endif
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 868b14f..42a429c 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -292,13 +292,13 @@ static void vcpu_deliver_ipi(struct kvm_vcpu *vcpu, uint64_t dm,
{
switch (dm) {
case SAPIC_FIXED:
- kvm_apic_set_irq(vcpu, vector, 0);
+ kvm_apic_set_irq(vcpu, vector, dm, 0);
break;
case SAPIC_NMI:
- kvm_apic_set_irq(vcpu, 2, 0);
+ kvm_apic_set_irq(vcpu, 2, dm, 0);
break;
case SAPIC_EXTINT:
- kvm_apic_set_irq(vcpu, 0, 0);
+ kvm_apic_set_irq(vcpu, 0, dm, 0);
break;
case SAPIC_INIT:
case SAPIC_PMI:
@@ -1811,7 +1811,7 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
put_cpu();
}
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig)
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig)
{
struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);
diff --git a/arch/ia64/kvm/lapic.h b/arch/ia64/kvm/lapic.h
index 6d6cbcb..cbcfaa6 100644
--- a/arch/ia64/kvm/lapic.h
+++ b/arch/ia64/kvm/lapic.h
@@ -20,6 +20,6 @@ void kvm_free_lapic(struct kvm_vcpu *vcpu);
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig);
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
#endif
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index afc59b2..8e5cc40 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -196,20 +196,30 @@ int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig)
+static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
+ int vector, int level, int trig_mode);
+
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig)
{
struct kvm_lapic *apic = vcpu->arch.apic;
+ int lapic_dmode;
- if (!apic_test_and_set_irr(vec, apic)) {
- /* a new pending irq is set in IRR */
- if (trig)
- apic_set_vector(vec, apic->regs + APIC_TMR);
- else
- apic_clear_vector(vec, apic->regs + APIC_TMR);
- kvm_vcpu_kick(apic->vcpu);
- return 1;
+ switch (dmode) {
+ case IOAPIC_LOWEST_PRIORITY:
+ lapic_dmode = APIC_DM_LOWEST;
+ break;
+ case IOAPIC_FIXED:
+ lapic_dmode = APIC_DM_FIXED;
+ break;
+ case IOAPIC_NMI:
+ lapic_dmode = APIC_DM_NMI;
+ break;
+ default:
+ printk(KERN_DEBUG"Ignoring delivery mode %d\n", dmode);
+ return 0;
+ break;
}
- return 0;
+ return __apic_accept_irq(apic, lapic_dmode, vec, 1, trig);
}
static inline int apic_find_highest_isr(struct kvm_lapic *apic)
@@ -327,7 +337,7 @@ static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
int vector, int level, int trig_mode)
{
- int orig_irr, result = 0;
+ int result = 0;
struct kvm_vcpu *vcpu = apic->vcpu;
switch (delivery_mode) {
@@ -337,10 +347,11 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
if (unlikely(!apic_enabled(apic)))
break;
- orig_irr = apic_test_and_set_irr(vector, apic);
- if (orig_irr && trig_mode) {
- apic_debug("level trig mode repeatedly for vector %d",
- vector);
+ result = !apic_test_and_set_irr(vector, apic);
+ if (!result) {
+ if (trig_mode)
+ apic_debug("level trig mode repeatedly for "
+ "vector %d", vector);
break;
}
@@ -349,10 +360,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
apic_set_vector(vector, apic->regs + APIC_TMR);
} else
apic_clear_vector(vector, apic->regs + APIC_TMR);
-
kvm_vcpu_kick(vcpu);
-
- result = (orig_irr == 0);
break;
case APIC_DM_REMRD:
@@ -364,12 +372,14 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
break;
case APIC_DM_NMI:
+ result = 1;
kvm_inject_nmi(vcpu);
kvm_vcpu_kick(vcpu);
break;
case APIC_DM_INIT:
if (level) {
+ result = 1;
if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
printk(KERN_DEBUG
"INIT on a runnable vcpu %d\n",
@@ -386,6 +396,7 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
apic_debug("SIPI to vcpu %d vector 0x%02x\n",
vcpu->vcpu_id, vector);
if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
+ result = 1;
vcpu->arch.sipi_vector = vector;
vcpu->arch.mp_state = KVM_MP_STATE_SIPI_RECEIVED;
kvm_vcpu_kick(vcpu);
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 45ab6ee..2a07fab 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -34,7 +34,7 @@ u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu);
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 trig);
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data);
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index ea268a8..d4a7948 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -142,25 +142,6 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
}
}
-static int ioapic_inj_irq(struct kvm_ioapic *ioapic,
- struct kvm_vcpu *vcpu,
- u8 vector, u8 trig_mode, u8 delivery_mode)
-{
- ioapic_debug("irq %d trig %d deliv %d\n", vector, trig_mode,
- delivery_mode);
-
- ASSERT((delivery_mode == IOAPIC_FIXED) ||
- (delivery_mode == IOAPIC_LOWEST_PRIORITY));
-
- return kvm_apic_set_irq(vcpu, vector, trig_mode);
-}
-
-static void ioapic_inj_nmi(struct kvm_vcpu *vcpu)
-{
- kvm_inject_nmi(vcpu);
- kvm_vcpu_kick(vcpu);
-}
-
static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
{
union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
@@ -193,21 +174,12 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
__clear_bit(vcpu_id, deliver_bitmask);
vcpu = ioapic->kvm->vcpus[vcpu_id];
if (vcpu) {
- if (entry.fields.delivery_mode ==
- IOAPIC_LOWEST_PRIORITY ||
- entry.fields.delivery_mode == IOAPIC_FIXED) {
- if (r < 0)
- r = 0;
- r += ioapic_inj_irq(ioapic, vcpu,
- entry.fields.vector,
- entry.fields.trig_mode,
- entry.fields.delivery_mode);
- } else if (entry.fields.delivery_mode == IOAPIC_NMI) {
- r = 1;
- ioapic_inj_nmi(vcpu);
- } else
- ioapic_debug("unsupported delivery mode %x!\n",
- entry.fields.delivery_mode);
+ if (r < 0)
+ r = 0;
+ r += kvm_apic_set_irq(vcpu,
+ entry.fields.vector,
+ entry.fields.trig_mode,
+ entry.fields.delivery_mode);
} else
ioapic_debug("null destination vcpu: "
"mask=%x vector=%x delivery_mode=%x\n",
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 1c6ff6d..325c668 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -148,6 +148,7 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
if (r < 0)
r = 0;
r += kvm_apic_set_irq(vcpu, entry.fields.vector,
+ entry.fields.dest_mode,
entry.fields.trig_mode);
}
}
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 2/5] ioapic/msi interrupt delivery consolidation.
2009-03-05 14:34 [PATCH v2 0/5] ioapic/lapic/msi cleanup Gleb Natapov
2009-03-05 14:34 ` [PATCH v2 1/5] Make kvm_apic_set_irq() deliver all kinds of interrupts Gleb Natapov
@ 2009-03-05 14:34 ` Gleb Natapov
2009-03-10 16:54 ` Mike Day
2009-03-05 14:34 ` [PATCH v2 3/5] Consolidate ioapic/ipi interrupt delivery logic Gleb Natapov
` (3 subsequent siblings)
5 siblings, 1 reply; 10+ messages in thread
From: Gleb Natapov @ 2009-03-05 14:34 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
ioapic_deliver() and kvm_set_msi() have code duplication. Move
the code into ioapic_deliver_entry() function and call it from
both places.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
virt/kvm/ioapic.c | 61 +++++++++++++++++++++++++++------------------------
virt/kvm/ioapic.h | 4 ++-
virt/kvm/irq_comm.c | 32 +++------------------------
3 files changed, 37 insertions(+), 60 deletions(-)
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index d4a7948..b71c044 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -142,54 +142,57 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
}
}
-static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
+int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e)
{
- union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
- struct kvm_vcpu *vcpu;
- int vcpu_id, r = -1;
+ int i, r = -1;
- ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
- "vector=%x trig_mode=%x\n",
- entry.fields.dest, entry.fields.dest_mode,
- entry.fields.delivery_mode, entry.fields.vector,
- entry.fields.trig_mode);
-
- /* Always delivery PIT interrupt to vcpu 0 */
-#ifdef CONFIG_X86
- if (irq == 0) {
- bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
- __set_bit(0, deliver_bitmask);
- } else
-#endif
- kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
+ kvm_get_intr_delivery_bitmask(kvm, e, deliver_bitmask);
if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
ioapic_debug("no target on destination\n");
- return 0;
+ return r;
}
- while ((vcpu_id = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
+ while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
< KVM_MAX_VCPUS) {
- __clear_bit(vcpu_id, deliver_bitmask);
- vcpu = ioapic->kvm->vcpus[vcpu_id];
+ struct kvm_vcpu *vcpu = kvm->vcpus[i];
+ __clear_bit(i, deliver_bitmask);
if (vcpu) {
if (r < 0)
r = 0;
- r += kvm_apic_set_irq(vcpu,
- entry.fields.vector,
- entry.fields.trig_mode,
- entry.fields.delivery_mode);
+ r += kvm_apic_set_irq(vcpu, e->fields.vector,
+ e->fields.delivery_mode,
+ e->fields.trig_mode);
} else
ioapic_debug("null destination vcpu: "
"mask=%x vector=%x delivery_mode=%x\n",
- entry.fields.deliver_bitmask,
- entry.fields.vector,
- entry.fields.delivery_mode);
+ e->fields.deliver_bitmask,
+ e->fields.vector, e->fields.delivery_mode);
}
return r;
}
+static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
+{
+ union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
+
+ ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
+ "vector=%x trig_mode=%x\n",
+ entry.fields.dest, entry.fields.dest_mode,
+ entry.fields.delivery_mode, entry.fields.vector,
+ entry.fields.trig_mode);
+
+#ifdef CONFIG_X86
+ /* Always delivery PIT interrupt to vcpu 0 */
+ if (irq == 0) {
+ entry.fields.dest_mode = 0; /* Physical mode. */
+ entry.fields.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
+ }
+#endif
+ return ioapic_deliver_entry(ioapic->kvm, &entry);
+}
+
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
{
u32 old_irr = ioapic->irr;
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index c8032ab..bedeea5 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -70,8 +70,8 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
void kvm_ioapic_reset(struct kvm_ioapic *ioapic);
-void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
+void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask);
-
+int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e);
#endif
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 325c668..35397a5 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -43,12 +43,11 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
}
-void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
+void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
union kvm_ioapic_redirect_entry *entry,
unsigned long *deliver_bitmask)
{
int i;
- struct kvm *kvm = ioapic->kvm;
struct kvm_vcpu *vcpu;
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
@@ -90,7 +89,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
switch (entry->fields.delivery_mode) {
case IOAPIC_LOWEST_PRIORITY:
/* Select one in deliver_bitmask */
- vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm,
+ vcpu = kvm_get_lowest_prio_vcpu(kvm,
entry->fields.vector, deliver_bitmask);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
if (!vcpu)
@@ -111,13 +110,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int level)
{
- int vcpu_id, r = -1;
- struct kvm_vcpu *vcpu;
- struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
union kvm_ioapic_redirect_entry entry;
- DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
-
- BUG_ON(!ioapic);
entry.bits = 0;
entry.fields.dest_id = (e->msi.address_lo &
@@ -133,26 +126,7 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
(unsigned long *)&e->msi.data);
/* TODO Deal with RH bit of MSI message address */
-
- kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask);
-
- if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
- printk(KERN_WARNING "kvm: no destination for MSI delivery!");
- return -1;
- }
- while ((vcpu_id = find_first_bit(deliver_bitmask,
- KVM_MAX_VCPUS)) < KVM_MAX_VCPUS) {
- __clear_bit(vcpu_id, deliver_bitmask);
- vcpu = ioapic->kvm->vcpus[vcpu_id];
- if (vcpu) {
- if (r < 0)
- r = 0;
- r += kvm_apic_set_irq(vcpu, entry.fields.vector,
- entry.fields.dest_mode,
- entry.fields.trig_mode);
- }
- }
- return r;
+ return ioapic_deliver_entry(kvm, &entry);
}
/* This should be called with the kvm->lock mutex held
^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: ioapic/msi interrupt delivery consolidation.
2009-03-05 14:34 ` [PATCH v2 2/5] ioapic/msi interrupt delivery consolidation Gleb Natapov
@ 2009-03-10 16:54 ` Mike Day
2009-03-11 1:42 ` Sheng Yang
0 siblings, 1 reply; 10+ messages in thread
From: Mike Day @ 2009-03-10 16:54 UTC (permalink / raw)
To: Gleb Natapov; +Cc: avi, mtosatti, kvm
On 05/03/09 16:34 +0200, Gleb Natapov wrote:
> ioapic_deliver() and kvm_set_msi() have code duplication. Move
> the code into ioapic_deliver_entry() function and call it from
> both places.
>
> +static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
> +{
> + union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
> +
> + ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
> + "vector=%x trig_mode=%x\n",
> + entry.fields.dest, entry.fields.dest_mode,
> + entry.fields.delivery_mode, entry.fields.vector,
> + entry.fields.trig_mode);
> +
> +#ifdef CONFIG_X86
> + /* Always delivery PIT interrupt to vcpu 0 */
> + if (irq == 0) {
> + entry.fields.dest_mode = 0; /* Physical mode. */
> + entry.fields.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
> + }
> +#endif
> + return ioapic_deliver_entry(ioapic->kvm, &entry);
> +}
> +
Why is the PIT always handled by vcpu 0?
thanks,
Mike
--
Mike Day
http://www.ncultra.org
AIM: ncmikeday | Yahoo IM: ultra.runner
PGP key: http://www.ncultra.org/ncmike/pubkey.asc
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: ioapic/msi interrupt delivery consolidation.
2009-03-10 16:54 ` Mike Day
@ 2009-03-11 1:42 ` Sheng Yang
0 siblings, 0 replies; 10+ messages in thread
From: Sheng Yang @ 2009-03-11 1:42 UTC (permalink / raw)
To: kvm, ncmike; +Cc: Gleb Natapov, avi, mtosatti
On Wednesday 11 March 2009 00:54:37 Mike Day wrote:
> On 05/03/09 16:34 +0200, Gleb Natapov wrote:
> > ioapic_deliver() and kvm_set_msi() have code duplication. Move
> > the code into ioapic_deliver_entry() function and call it from
> > both places.
> >
> >
> > +static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
> > +{
> > + union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
> > +
> > + ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
> > + "vector=%x trig_mode=%x\n",
> > + entry.fields.dest, entry.fields.dest_mode,
> > + entry.fields.delivery_mode, entry.fields.vector,
> > + entry.fields.trig_mode);
> > +
> > +#ifdef CONFIG_X86
> > + /* Always delivery PIT interrupt to vcpu 0 */
> > + if (irq == 0) {
> > + entry.fields.dest_mode = 0; /* Physical mode. */
> > + entry.fields.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
> > + }
> > +#endif
> > + return ioapic_deliver_entry(ioapic->kvm, &entry);
> > +}
> > +
>
> Why is the PIT always handled by vcpu 0?
>
> thanks,
Hi Mike
This due to a timer bug, please google "The SMP RHEL 5.1 PAE guest can't boot
up issue". (should be http://www.mail-archive.com/kvm-
devel@lists.sourceforge.net/msg13250.html but damn it, seems I've blocked by
Chinese GFW to get the page...)
--
regards
Yang, Sheng
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v2 3/5] Consolidate ioapic/ipi interrupt delivery logic.
2009-03-05 14:34 [PATCH v2 0/5] ioapic/lapic/msi cleanup Gleb Natapov
2009-03-05 14:34 ` [PATCH v2 1/5] Make kvm_apic_set_irq() deliver all kinds of interrupts Gleb Natapov
2009-03-05 14:34 ` [PATCH v2 2/5] ioapic/msi interrupt delivery consolidation Gleb Natapov
@ 2009-03-05 14:34 ` Gleb Natapov
2009-03-05 14:34 ` [PATCH v2 4/5] Change the way how lowest priority vcpu is calculated Gleb Natapov
` (2 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Gleb Natapov @ 2009-03-05 14:34 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
Use kvm_apic_match_dest() in kvm_get_intr_delivery_bitmask() instead
of duplicating the same code. Use kvm_get_intr_delivery_bitmask() in
apic_send_ipi() to figure out ipi destination instead of reimplementing
the logic.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/ia64/kvm/kvm-ia64.c | 8 +++++
arch/ia64/kvm/lapic.h | 3 ++
arch/x86/kvm/lapic.c | 69 ++++++++++++++++---------------------------
arch/x86/kvm/lapic.h | 2 +
virt/kvm/ioapic.c | 5 ++-
virt/kvm/ioapic.h | 10 ++++--
virt/kvm/irq_comm.c | 74 +++++++++++++---------------------------------
7 files changed, 70 insertions(+), 101 deletions(-)
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 42a429c..9a0cae7 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1850,6 +1850,14 @@ struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
return lvcpu;
}
+int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
+ int short_hand, int dest, int dest_mode)
+{
+ return (dest_mode == 0) ?
+ kvm_apic_match_physical_addr(target, dest) :
+ kvm_apic_match_logical_addr(target, dest);
+}
+
static int find_highest_bits(int *dat)
{
u32 bits, bitnum;
diff --git a/arch/ia64/kvm/lapic.h b/arch/ia64/kvm/lapic.h
index cbcfaa6..31602e7 100644
--- a/arch/ia64/kvm/lapic.h
+++ b/arch/ia64/kvm/lapic.h
@@ -20,6 +20,9 @@ void kvm_free_lapic(struct kvm_vcpu *vcpu);
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
+int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
+ int short_hand, int dest, int dest_mode);
+bool kvm_apic_present(struct kvm_vcpu *vcpu);
int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
#endif
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 8e5cc40..3d9c30b 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -260,7 +260,7 @@ static void apic_set_tpr(struct kvm_lapic *apic, u32 tpr)
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
{
- return kvm_apic_id(apic) == dest;
+ return dest == 0xff || kvm_apic_id(apic) == dest;
}
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
@@ -289,37 +289,34 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
return result;
}
-static int apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
+int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode)
{
int result = 0;
struct kvm_lapic *target = vcpu->arch.apic;
apic_debug("target %p, source %p, dest 0x%x, "
- "dest_mode 0x%x, short_hand 0x%x",
+ "dest_mode 0x%x, short_hand 0x%x\n",
target, source, dest, dest_mode, short_hand);
ASSERT(!target);
switch (short_hand) {
case APIC_DEST_NOSHORT:
- if (dest_mode == 0) {
+ if (dest_mode == 0)
/* Physical mode. */
- if ((dest == 0xFF) || (dest == kvm_apic_id(target)))
- result = 1;
- } else
+ result = kvm_apic_match_physical_addr(target, dest);
+ else
/* Logical mode. */
result = kvm_apic_match_logical_addr(target, dest);
break;
case APIC_DEST_SELF:
- if (target == source)
- result = 1;
+ result = (target == source);
break;
case APIC_DEST_ALLINC:
result = 1;
break;
case APIC_DEST_ALLBUT:
- if (target != source)
- result = 1;
+ result = (target != source);
break;
default:
printk(KERN_WARNING "Bad dest shorthand value %x\n",
@@ -492,38 +489,26 @@ static void apic_send_ipi(struct kvm_lapic *apic)
unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
unsigned int vector = icr_low & APIC_VECTOR_MASK;
- struct kvm_vcpu *target;
- struct kvm_vcpu *vcpu;
- DECLARE_BITMAP(lpr_map, KVM_MAX_VCPUS);
+ DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
int i;
- bitmap_zero(lpr_map, KVM_MAX_VCPUS);
apic_debug("icr_high 0x%x, icr_low 0x%x, "
"short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
"dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
icr_high, icr_low, short_hand, dest,
trig_mode, level, dest_mode, delivery_mode, vector);
- for (i = 0; i < KVM_MAX_VCPUS; i++) {
- vcpu = apic->vcpu->kvm->vcpus[i];
- if (!vcpu)
- continue;
-
- if (vcpu->arch.apic &&
- apic_match_dest(vcpu, apic, short_hand, dest, dest_mode)) {
- if (delivery_mode == APIC_DM_LOWEST)
- __set_bit(vcpu->vcpu_id, lpr_map);
- else
- __apic_accept_irq(vcpu->arch.apic, delivery_mode,
- vector, level, trig_mode);
- }
- }
-
- if (delivery_mode == APIC_DM_LOWEST) {
- target = kvm_get_lowest_prio_vcpu(vcpu->kvm, vector, lpr_map);
- if (target != NULL)
- __apic_accept_irq(target->arch.apic, delivery_mode,
- vector, level, trig_mode);
+ kvm_get_intr_delivery_bitmask(apic->vcpu->kvm, apic, dest, dest_mode,
+ delivery_mode == APIC_DM_LOWEST, short_hand,
+ deliver_bitmask);
+
+ while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
+ < KVM_MAX_VCPUS) {
+ struct kvm_vcpu *vcpu = apic->vcpu->kvm->vcpus[i];
+ __clear_bit(i, deliver_bitmask);
+ if (vcpu)
+ __apic_accept_irq(vcpu->arch.apic, delivery_mode,
+ vector, level, trig_mode);
}
}
@@ -929,16 +914,14 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_lapic_reset);
-int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
+bool kvm_apic_present(struct kvm_vcpu *vcpu)
{
- struct kvm_lapic *apic = vcpu->arch.apic;
- int ret = 0;
-
- if (!apic)
- return 0;
- ret = apic_enabled(apic);
+ return vcpu->arch.apic && apic_hw_enabled(vcpu->arch.apic);
+}
- return ret;
+int kvm_lapic_enabled(struct kvm_vcpu *vcpu)
+{
+ return kvm_apic_present(vcpu) && apic_sw_enabled(vcpu->arch.apic);
}
EXPORT_SYMBOL_GPL(kvm_lapic_enabled);
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 2a07fab..2c1b8ae 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -40,6 +40,8 @@ u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data);
void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu);
int kvm_lapic_enabled(struct kvm_vcpu *vcpu);
+bool kvm_apic_present(struct kvm_vcpu *vcpu);
+bool kvm_lapic_present(struct kvm_vcpu *vcpu);
int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu);
void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index b71c044..43969bb 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -147,7 +147,10 @@ int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e)
DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
int i, r = -1;
- kvm_get_intr_delivery_bitmask(kvm, e, deliver_bitmask);
+ kvm_get_intr_delivery_bitmask(kvm, NULL, e->fields.dest_id,
+ e->fields.dest_mode,
+ e->fields.delivery_mode == IOAPIC_LOWEST_PRIORITY,
+ 0, deliver_bitmask);
if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
ioapic_debug("no target on destination\n");
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index bedeea5..d996c7a 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -65,13 +65,15 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
}
struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
- unsigned long *bitmap);
+ unsigned long *bitmap);
+int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
+ int short_hand, int dest, int dest_mode);
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
void kvm_ioapic_reset(struct kvm_ioapic *ioapic);
-void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
- union kvm_ioapic_redirect_entry *entry,
- unsigned long *deliver_bitmask);
+void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
+ int dest_id, int dest_mode, bool low_prio, int short_hand,
+ unsigned long *deliver_bitmask);
int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e);
#endif
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 35397a5..e43701c 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -43,67 +43,35 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
}
-void kvm_get_intr_delivery_bitmask(struct kvm *kvm,
- union kvm_ioapic_redirect_entry *entry,
- unsigned long *deliver_bitmask)
+void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
+ int dest_id, int dest_mode, bool low_prio, int short_hand,
+ unsigned long *deliver_bitmask)
{
int i;
struct kvm_vcpu *vcpu;
+ if (dest_mode == 0 && dest_id == 0xff && low_prio)
+ printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
+
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
+ for (i = 0; i < KVM_MAX_VCPUS; i++) {
+ vcpu = kvm->vcpus[i];
- if (entry->fields.dest_mode == 0) { /* Physical mode. */
- if (entry->fields.dest_id == 0xFF) { /* Broadcast. */
- for (i = 0; i < KVM_MAX_VCPUS; ++i)
- if (kvm->vcpus[i] && kvm->vcpus[i]->arch.apic)
- __set_bit(i, deliver_bitmask);
- /* Lowest priority shouldn't combine with broadcast */
- if (entry->fields.delivery_mode ==
- IOAPIC_LOWEST_PRIORITY && printk_ratelimit())
- printk(KERN_INFO "kvm: apic: phys broadcast "
- "and lowest prio\n");
- return;
- }
- for (i = 0; i < KVM_MAX_VCPUS; ++i) {
- vcpu = kvm->vcpus[i];
- if (!vcpu)
- continue;
- if (kvm_apic_match_physical_addr(vcpu->arch.apic,
- entry->fields.dest_id)) {
- if (vcpu->arch.apic)
- __set_bit(i, deliver_bitmask);
- break;
- }
- }
- } else if (entry->fields.dest_id != 0) /* Logical mode, MDA non-zero. */
- for (i = 0; i < KVM_MAX_VCPUS; ++i) {
- vcpu = kvm->vcpus[i];
- if (!vcpu)
- continue;
- if (vcpu->arch.apic &&
- kvm_apic_match_logical_addr(vcpu->arch.apic,
- entry->fields.dest_id))
- __set_bit(i, deliver_bitmask);
- }
+ if (!vcpu || !kvm_apic_present(vcpu))
+ continue;
- switch (entry->fields.delivery_mode) {
- case IOAPIC_LOWEST_PRIORITY:
- /* Select one in deliver_bitmask */
- vcpu = kvm_get_lowest_prio_vcpu(kvm,
- entry->fields.vector, deliver_bitmask);
- bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
- if (!vcpu)
- return;
- __set_bit(vcpu->vcpu_id, deliver_bitmask);
- break;
- case IOAPIC_FIXED:
- case IOAPIC_NMI:
- break;
- default:
- if (printk_ratelimit())
- printk(KERN_INFO "kvm: unsupported delivery mode %d\n",
- entry->fields.delivery_mode);
+ if (!kvm_apic_match_dest(vcpu, src, short_hand, dest_id,
+ dest_mode))
+ continue;
+
+ __set_bit(i, deliver_bitmask);
+ }
+
+ if (low_prio) {
+ vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
+ if (vcpu)
+ __set_bit(vcpu->vcpu_id, deliver_bitmask);
}
}
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 4/5] Change the way how lowest priority vcpu is calculated.
2009-03-05 14:34 [PATCH v2 0/5] ioapic/lapic/msi cleanup Gleb Natapov
` (2 preceding siblings ...)
2009-03-05 14:34 ` [PATCH v2 3/5] Consolidate ioapic/ipi interrupt delivery logic Gleb Natapov
@ 2009-03-05 14:34 ` Gleb Natapov
2009-03-05 14:35 ` [PATCH v2 5/5] Get rid of deliver_bitmask Gleb Natapov
2009-03-05 22:34 ` [PATCH v2 0/5] ioapic/lapic/msi cleanup Marcelo Tosatti
5 siblings, 0 replies; 10+ messages in thread
From: Gleb Natapov @ 2009-03-05 14:34 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
The new way does not require additional loop over vcpus to calculate
the one with lowest priority as one is chosen during delivery bitmap
construction.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/ia64/kvm/kvm-ia64.c | 15 ++------------
arch/ia64/kvm/lapic.h | 1 +
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/lapic.c | 43 +++++----------------------------------
virt/kvm/ioapic.h | 3 +--
virt/kvm/irq_comm.c | 19 ++++++++++-------
6 files changed, 22 insertions(+), 61 deletions(-)
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 9a0cae7..fdd4c75 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1834,20 +1834,9 @@ int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda)
return 0;
}
-struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
- unsigned long *bitmap)
+int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
{
- struct kvm_vcpu *lvcpu = kvm->vcpus[0];
- int i;
-
- for (i = 1; i < kvm->arch.online_vcpus; i++) {
- if (!kvm->vcpus[i])
- continue;
- if (lvcpu->arch.xtp > kvm->vcpus[i]->arch.xtp)
- lvcpu = kvm->vcpus[i];
- }
-
- return lvcpu;
+ return vcpu1->arch.xtp - vcpu2->arch.xtp;
}
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
diff --git a/arch/ia64/kvm/lapic.h b/arch/ia64/kvm/lapic.h
index 31602e7..e42109e 100644
--- a/arch/ia64/kvm/lapic.h
+++ b/arch/ia64/kvm/lapic.h
@@ -22,6 +22,7 @@ int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
+int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
bool kvm_apic_present(struct kvm_vcpu *vcpu);
int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f0faf58..4627627 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -286,6 +286,7 @@ struct kvm_vcpu_arch {
u64 shadow_efer;
u64 apic_base;
struct kvm_lapic *apic; /* kernel irqchip context */
+ int32_t apic_arb_prio;
int mp_state;
int sipi_vector;
u64 ia32_misc_enable_msr;
@@ -400,7 +401,6 @@ struct kvm_arch{
struct hlist_head irq_ack_notifier_list;
int vapics_in_nmi_mode;
- int round_robin_prev_vcpu;
unsigned int tss_addr;
struct page *apic_access_page;
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 3d9c30b..276c26d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -338,8 +338,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
struct kvm_vcpu *vcpu = apic->vcpu;
switch (delivery_mode) {
- case APIC_DM_FIXED:
case APIC_DM_LOWEST:
+ vcpu->arch.apic_arb_prio++;
+ case APIC_DM_FIXED:
/* FIXME add logic for vcpu on reset */
if (unlikely(!apic_enabled(apic)))
break;
@@ -416,43 +417,9 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
return result;
}
-static struct kvm_lapic *kvm_apic_round_robin(struct kvm *kvm, u8 vector,
- unsigned long *bitmap)
+int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2)
{
- int last;
- int next;
- struct kvm_lapic *apic = NULL;
-
- last = kvm->arch.round_robin_prev_vcpu;
- next = last;
-
- do {
- if (++next == KVM_MAX_VCPUS)
- next = 0;
- if (kvm->vcpus[next] == NULL || !test_bit(next, bitmap))
- continue;
- apic = kvm->vcpus[next]->arch.apic;
- if (apic && apic_enabled(apic))
- break;
- apic = NULL;
- } while (next != last);
- kvm->arch.round_robin_prev_vcpu = next;
-
- if (!apic)
- printk(KERN_DEBUG "vcpu not ready for apic_round_robin\n");
-
- return apic;
-}
-
-struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
- unsigned long *bitmap)
-{
- struct kvm_lapic *apic;
-
- apic = kvm_apic_round_robin(kvm, vector, bitmap);
- if (apic)
- return apic->vcpu;
- return NULL;
+ return vcpu1->arch.apic_arb_prio - vcpu2->arch.apic_arb_prio;
}
static void apic_set_eoi(struct kvm_lapic *apic)
@@ -907,6 +874,8 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu)
vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
apic_update_ppr(apic);
+ vcpu->arch.apic_arb_prio = 0;
+
apic_debug(KERN_INFO "%s: vcpu=%p, id=%d, base_msr="
"0x%016" PRIx64 ", base_address=0x%0lx.\n", __func__,
vcpu, kvm_apic_id(apic),
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index d996c7a..e7bc92d 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -64,10 +64,9 @@ static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
return kvm->arch.vioapic;
}
-struct kvm_vcpu *kvm_get_lowest_prio_vcpu(struct kvm *kvm, u8 vector,
- unsigned long *bitmap);
int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
+int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index e43701c..f5e059b 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -47,7 +47,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
int dest_id, int dest_mode, bool low_prio, int short_hand,
unsigned long *deliver_bitmask)
{
- int i;
+ int i, lowest = -1;
struct kvm_vcpu *vcpu;
if (dest_mode == 0 && dest_id == 0xff && low_prio)
@@ -64,15 +64,18 @@ void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
dest_mode))
continue;
- __set_bit(i, deliver_bitmask);
+ if (!low_prio) {
+ __set_bit(i, deliver_bitmask);
+ } else {
+ if (lowest < 0)
+ lowest = i;
+ if (kvm_apic_compare_prio(vcpu, kvm->vcpus[lowest]) < 0)
+ lowest = i;
+ }
}
- if (low_prio) {
- vcpu = kvm_get_lowest_prio_vcpu(kvm, 0, deliver_bitmask);
- bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
- if (vcpu)
- __set_bit(vcpu->vcpu_id, deliver_bitmask);
- }
+ if (lowest != -1)
+ __set_bit(lowest, deliver_bitmask);
}
static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 5/5] Get rid of deliver_bitmask.
2009-03-05 14:34 [PATCH v2 0/5] ioapic/lapic/msi cleanup Gleb Natapov
` (3 preceding siblings ...)
2009-03-05 14:34 ` [PATCH v2 4/5] Change the way how lowest priority vcpu is calculated Gleb Natapov
@ 2009-03-05 14:35 ` Gleb Natapov
2009-03-05 22:34 ` [PATCH v2 0/5] ioapic/lapic/msi cleanup Marcelo Tosatti
5 siblings, 0 replies; 10+ messages in thread
From: Gleb Natapov @ 2009-03-05 14:35 UTC (permalink / raw)
To: avi, mtosatti; +Cc: kvm
Deliver interrupt during destination matching loop.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
arch/ia64/kvm/kvm-ia64.c | 32 ++++++++++++++----------
arch/ia64/kvm/lapic.h | 2 +-
arch/x86/kvm/lapic.c | 59 ++++++++++++---------------------------------
arch/x86/kvm/lapic.h | 2 +-
include/linux/kvm_types.h | 10 ++++++++
virt/kvm/ioapic.c | 57 ++++++++++++-------------------------------
virt/kvm/ioapic.h | 6 ++---
virt/kvm/irq_comm.c | 58 ++++++++++++++++++++++----------------------
8 files changed, 93 insertions(+), 133 deletions(-)
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index fdd4c75..e1984cb 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -283,6 +283,18 @@ static int handle_sal_call(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
}
+static int __apic_accept_irq(struct kvm_vcpu *vcpu, uint64_t vector)
+{
+ struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);
+
+ if (!test_and_set_bit(vector, &vpd->irr[0])) {
+ vcpu->arch.irq_new_pending = 1;
+ kvm_vcpu_kick(vcpu);
+ return 1;
+ }
+ return 0;
+}
+
/*
* offset: address offset to IPI space.
* value: deliver value.
@@ -292,20 +304,20 @@ static void vcpu_deliver_ipi(struct kvm_vcpu *vcpu, uint64_t dm,
{
switch (dm) {
case SAPIC_FIXED:
- kvm_apic_set_irq(vcpu, vector, dm, 0);
break;
case SAPIC_NMI:
- kvm_apic_set_irq(vcpu, 2, dm, 0);
+ vector = 2;
break;
case SAPIC_EXTINT:
- kvm_apic_set_irq(vcpu, 0, dm, 0);
+ vector = 0;
break;
case SAPIC_INIT:
case SAPIC_PMI:
default:
printk(KERN_ERR"kvm: Unimplemented Deliver reserved IPI!\n");
- break;
+ return
}
+ __apic_accept_irq(vcpu, vector);
}
static struct kvm_vcpu *lid_to_vcpu(struct kvm *kvm, unsigned long id,
@@ -1811,17 +1823,9 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
put_cpu();
}
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig)
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
{
-
- struct vpd *vpd = to_host(vcpu->kvm, vcpu->arch.vpd);
-
- if (!test_and_set_bit(vec, &vpd->irr[0])) {
- vcpu->arch.irq_new_pending = 1;
- kvm_vcpu_kick(vcpu);
- return 1;
- }
- return 0;
+ return __apic_accept_irq(vcpu, irq->vector);
}
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest)
diff --git a/arch/ia64/kvm/lapic.h b/arch/ia64/kvm/lapic.h
index e42109e..2323233 100644
--- a/arch/ia64/kvm/lapic.h
+++ b/arch/ia64/kvm/lapic.h
@@ -24,6 +24,6 @@ int kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
int short_hand, int dest, int dest_mode);
int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
bool kvm_apic_present(struct kvm_vcpu *vcpu);
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq);
#endif
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 276c26d..bf85d83 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -199,27 +199,12 @@ EXPORT_SYMBOL_GPL(kvm_lapic_find_highest_irr);
static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
int vector, int level, int trig_mode);
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig)
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
{
struct kvm_lapic *apic = vcpu->arch.apic;
- int lapic_dmode;
- switch (dmode) {
- case IOAPIC_LOWEST_PRIORITY:
- lapic_dmode = APIC_DM_LOWEST;
- break;
- case IOAPIC_FIXED:
- lapic_dmode = APIC_DM_FIXED;
- break;
- case IOAPIC_NMI:
- lapic_dmode = APIC_DM_NMI;
- break;
- default:
- printk(KERN_DEBUG"Ignoring delivery mode %d\n", dmode);
- return 0;
- break;
- }
- return __apic_accept_irq(apic, lapic_dmode, vec, 1, trig);
+ return __apic_accept_irq(apic, irq->delivery_mode, irq->vector,
+ irq->level, irq->trig_mode);
}
static inline int apic_find_highest_isr(struct kvm_lapic *apic)
@@ -447,36 +432,24 @@ static void apic_send_ipi(struct kvm_lapic *apic)
{
u32 icr_low = apic_get_reg(apic, APIC_ICR);
u32 icr_high = apic_get_reg(apic, APIC_ICR2);
+ struct kvm_lapic_irq irq;
- unsigned int dest = GET_APIC_DEST_FIELD(icr_high);
- unsigned int short_hand = icr_low & APIC_SHORT_MASK;
- unsigned int trig_mode = icr_low & APIC_INT_LEVELTRIG;
- unsigned int level = icr_low & APIC_INT_ASSERT;
- unsigned int dest_mode = icr_low & APIC_DEST_MASK;
- unsigned int delivery_mode = icr_low & APIC_MODE_MASK;
- unsigned int vector = icr_low & APIC_VECTOR_MASK;
-
- DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
- int i;
+ irq.vector = icr_low & APIC_VECTOR_MASK;
+ irq.delivery_mode = icr_low & APIC_MODE_MASK;
+ irq.dest_mode = icr_low & APIC_DEST_MASK;
+ irq.level = icr_low & APIC_INT_ASSERT;
+ irq.trig_mode = icr_low & APIC_INT_LEVELTRIG;
+ irq.shorthand = icr_low & APIC_SHORT_MASK;
+ irq.dest_id = GET_APIC_DEST_FIELD(icr_high);
apic_debug("icr_high 0x%x, icr_low 0x%x, "
"short_hand 0x%x, dest 0x%x, trig_mode 0x%x, level 0x%x, "
"dest_mode 0x%x, delivery_mode 0x%x, vector 0x%x\n",
- icr_high, icr_low, short_hand, dest,
- trig_mode, level, dest_mode, delivery_mode, vector);
-
- kvm_get_intr_delivery_bitmask(apic->vcpu->kvm, apic, dest, dest_mode,
- delivery_mode == APIC_DM_LOWEST, short_hand,
- deliver_bitmask);
-
- while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
- < KVM_MAX_VCPUS) {
- struct kvm_vcpu *vcpu = apic->vcpu->kvm->vcpus[i];
- __clear_bit(i, deliver_bitmask);
- if (vcpu)
- __apic_accept_irq(vcpu->arch.apic, delivery_mode,
- vector, level, trig_mode);
- }
+ icr_high, icr_low, irq.shorthand, irq.dest,
+ irq.trig_mode, irq.level, irq.dest_mode, irq.delivery_mode,
+ irq.vector);
+
+ kvm_irq_delivery_to_apic(apic->vcpu->kvm, apic, &irq);
}
static u32 apic_get_tmcct(struct kvm_lapic *apic)
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 2c1b8ae..45fc181 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -34,7 +34,7 @@ u64 kvm_lapic_get_base(struct kvm_vcpu *vcpu);
int kvm_apic_match_physical_addr(struct kvm_lapic *apic, u16 dest);
int kvm_apic_match_logical_addr(struct kvm_lapic *apic, u8 mda);
-int kvm_apic_set_irq(struct kvm_vcpu *vcpu, u8 vec, u8 dmode, u8 trig);
+int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq);
u64 kvm_get_apic_base(struct kvm_vcpu *vcpu);
void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data);
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index b84aca3..fb46efb 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -57,4 +57,14 @@ union kvm_ioapic_redirect_entry {
} fields;
};
+struct kvm_lapic_irq {
+ u32 vector;
+ u32 delivery_mode;
+ u32 dest_mode;
+ u32 level;
+ u32 trig_mode;
+ u32 shorthand;
+ u32 dest_id;
+};
+
#endif /* __KVM_TYPES_H__ */
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 43969bb..1eddae9 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -142,58 +142,33 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
}
}
-int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e)
-{
- DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS);
- int i, r = -1;
-
- kvm_get_intr_delivery_bitmask(kvm, NULL, e->fields.dest_id,
- e->fields.dest_mode,
- e->fields.delivery_mode == IOAPIC_LOWEST_PRIORITY,
- 0, deliver_bitmask);
-
- if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) {
- ioapic_debug("no target on destination\n");
- return r;
- }
-
- while ((i = find_first_bit(deliver_bitmask, KVM_MAX_VCPUS))
- < KVM_MAX_VCPUS) {
- struct kvm_vcpu *vcpu = kvm->vcpus[i];
- __clear_bit(i, deliver_bitmask);
- if (vcpu) {
- if (r < 0)
- r = 0;
- r += kvm_apic_set_irq(vcpu, e->fields.vector,
- e->fields.delivery_mode,
- e->fields.trig_mode);
- } else
- ioapic_debug("null destination vcpu: "
- "mask=%x vector=%x delivery_mode=%x\n",
- e->fields.deliver_bitmask,
- e->fields.vector, e->fields.delivery_mode);
- }
- return r;
-}
-
static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
{
- union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq];
+ union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
+ struct kvm_lapic_irq irqe;
ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
"vector=%x trig_mode=%x\n",
- entry.fields.dest, entry.fields.dest_mode,
- entry.fields.delivery_mode, entry.fields.vector,
- entry.fields.trig_mode);
+ entry->fields.dest, entry->fields.dest_mode,
+ entry->fields.delivery_mode, entry->fields.vector,
+ entry->fields.trig_mode);
+
+ irqe.dest_id = entry->fields.dest_id;
+ irqe.vector = entry->fields.vector;
+ irqe.dest_mode = entry->fields.dest_mode;
+ irqe.trig_mode = entry->fields.trig_mode;
+ irqe.delivery_mode = entry->fields.delivery_mode << 8;
+ irqe.level = 1;
+ irqe.shorthand = 0;
#ifdef CONFIG_X86
/* Always delivery PIT interrupt to vcpu 0 */
if (irq == 0) {
- entry.fields.dest_mode = 0; /* Physical mode. */
- entry.fields.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
+ irqe.dest_mode = 0; /* Physical mode. */
+ irqe.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
}
#endif
- return ioapic_deliver_entry(ioapic->kvm, &entry);
+ return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
}
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
diff --git a/virt/kvm/ioapic.h b/virt/kvm/ioapic.h
index e7bc92d..7080b71 100644
--- a/virt/kvm/ioapic.h
+++ b/virt/kvm/ioapic.h
@@ -71,8 +71,6 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector, int trigger_mode);
int kvm_ioapic_init(struct kvm *kvm);
int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level);
void kvm_ioapic_reset(struct kvm_ioapic *ioapic);
-void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
- int dest_id, int dest_mode, bool low_prio, int short_hand,
- unsigned long *deliver_bitmask);
-int ioapic_deliver_entry(struct kvm *kvm, union kvm_ioapic_redirect_entry *e);
+int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
+ struct kvm_lapic_irq *irq);
#endif
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index f5e059b..c3f3b9f 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -43,61 +43,61 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level);
}
-void kvm_get_intr_delivery_bitmask(struct kvm *kvm, struct kvm_lapic *src,
- int dest_id, int dest_mode, bool low_prio, int short_hand,
- unsigned long *deliver_bitmask)
+int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
+ struct kvm_lapic_irq *irq)
{
- int i, lowest = -1;
- struct kvm_vcpu *vcpu;
+ int i, r = -1;
+ struct kvm_vcpu *vcpu, *lowest = NULL;
- if (dest_mode == 0 && dest_id == 0xff && low_prio)
+ if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
+ irq->delivery_mode == APIC_DM_LOWEST)
printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
- bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS);
for (i = 0; i < KVM_MAX_VCPUS; i++) {
vcpu = kvm->vcpus[i];
if (!vcpu || !kvm_apic_present(vcpu))
continue;
- if (!kvm_apic_match_dest(vcpu, src, short_hand, dest_id,
- dest_mode))
+ if (!kvm_apic_match_dest(vcpu, src, irq->shorthand,
+ irq->dest_id, irq->dest_mode))
continue;
- if (!low_prio) {
- __set_bit(i, deliver_bitmask);
+ if (irq->delivery_mode != APIC_DM_LOWEST) {
+ if (r < 0)
+ r = 0;
+ r += kvm_apic_set_irq(vcpu, irq);
} else {
- if (lowest < 0)
- lowest = i;
- if (kvm_apic_compare_prio(vcpu, kvm->vcpus[lowest]) < 0)
- lowest = i;
+ if (!lowest)
+ lowest = vcpu;
+ else if (kvm_apic_compare_prio(vcpu, lowest) < 0)
+ lowest = vcpu;
}
}
- if (lowest != -1)
- __set_bit(lowest, deliver_bitmask);
+ if (lowest)
+ r = kvm_apic_set_irq(lowest, irq);
+
+ return r;
}
static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int level)
{
- union kvm_ioapic_redirect_entry entry;
+ struct kvm_lapic_irq irq;
- entry.bits = 0;
- entry.fields.dest_id = (e->msi.address_lo &
+ irq.dest_id = (e->msi.address_lo &
MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
- entry.fields.vector = (e->msi.data &
+ irq.vector = (e->msi.data &
MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
- entry.fields.dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
- (unsigned long *)&e->msi.address_lo);
- entry.fields.trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
- (unsigned long *)&e->msi.data);
- entry.fields.delivery_mode = test_bit(
- MSI_DATA_DELIVERY_MODE_SHIFT,
- (unsigned long *)&e->msi.data);
+ irq.dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
+ irq.trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
+ irq.delivery_mode = e->msi.data & 0x700;
+ irq.level = 1;
+ irq.shorthand = 0;
/* TODO Deal with RH bit of MSI message address */
- return ioapic_deliver_entry(kvm, &entry);
+ return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
}
/* This should be called with the kvm->lock mutex held
^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: [PATCH v2 0/5] ioapic/lapic/msi cleanup
2009-03-05 14:34 [PATCH v2 0/5] ioapic/lapic/msi cleanup Gleb Natapov
` (4 preceding siblings ...)
2009-03-05 14:35 ` [PATCH v2 5/5] Get rid of deliver_bitmask Gleb Natapov
@ 2009-03-05 22:34 ` Marcelo Tosatti
2009-03-06 6:06 ` Gleb Natapov
5 siblings, 1 reply; 10+ messages in thread
From: Marcelo Tosatti @ 2009-03-05 22:34 UTC (permalink / raw)
To: Gleb Natapov; +Cc: avi, kvm
On Thu, Mar 05, 2009 at 04:34:38PM +0200, Gleb Natapov wrote:
> There are many code/logic duplications throughout ioapic/lapic/msi device
> emulation. Try to consolidate as much code as possible.
>
> ---
>
> Gleb Natapov (5):
> Get rid of deliver_bitmask.
> Change the way how lowest priority vcpu is calculated.
> Consolidate ioapic/ipi interrupt delivery logic.
> ioapic/msi interrupt delivery consolidation.
> Make kvm_apic_set_irq() deliver all kinds of interrupts.
Applied and pushed, thanks.
There is one issue with the new low prio selection though. Say you have
an interrupt whose load is shared between all vcpus in the guest.
The first vcpu which has its counter overflowed will then handle the int
load by itself until it approximates to the counter of the other vcpus.
Same happens with cpu hotplug.
Not sure that the best way is to fix that. Perhaps reset all online
vcpus to 0 on overflow/cpu-hotplug ?
Or max the counter to a smaller value like 64 or something.
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v2 0/5] ioapic/lapic/msi cleanup
2009-03-05 22:34 ` [PATCH v2 0/5] ioapic/lapic/msi cleanup Marcelo Tosatti
@ 2009-03-06 6:06 ` Gleb Natapov
0 siblings, 0 replies; 10+ messages in thread
From: Gleb Natapov @ 2009-03-06 6:06 UTC (permalink / raw)
To: Marcelo Tosatti; +Cc: avi, kvm
On Thu, Mar 05, 2009 at 07:34:36PM -0300, Marcelo Tosatti wrote:
> On Thu, Mar 05, 2009 at 04:34:38PM +0200, Gleb Natapov wrote:
> > There are many code/logic duplications throughout ioapic/lapic/msi device
> > emulation. Try to consolidate as much code as possible.
> >
> > ---
> >
> > Gleb Natapov (5):
> > Get rid of deliver_bitmask.
> > Change the way how lowest priority vcpu is calculated.
> > Consolidate ioapic/ipi interrupt delivery logic.
> > ioapic/msi interrupt delivery consolidation.
> > Make kvm_apic_set_irq() deliver all kinds of interrupts.
>
> Applied and pushed, thanks.
>
> There is one issue with the new low prio selection though. Say you have
> an interrupt whose load is shared between all vcpus in the guest.
>
> The first vcpu which has its counter overflowed will then handle the int
> load by itself until it approximates to the counter of the other vcpus.
>
I took this in account. The priority counter is signed, so if say vcpu1
counter is overflows to 0x7fffffff + 1 and the vcpu2 counter is still
0x7fffffff then vcpu1 - vcpu2 = 1 and vcpu2 will be chosen to deliver
interrupts.
> Same happens with cpu hotplug.
>
For got about hotplug :(
> Not sure that the best way is to fix that. Perhaps reset all online
> vcpus to 0 on overflow/cpu-hotplug ?
>
Yes, rest counters on hotplug should work and is rare event.
> Or max the counter to a smaller value like 64 or something.
I'll try this and see how well interrupts will be spread between CPUs.
--
Gleb.
^ permalink raw reply [flat|nested] 10+ messages in thread