Directed EOI is specified by x2APIC, but is available even when lapic is
in xAPIC mode.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
arch/x86/include/asm/apicdef.h | 2 ++
arch/x86/kvm/lapic.c | 13 ++++++++-----
2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/apicdef.h b/arch/x86/include/asm/apicdef.h
index 7ddb36a..74ca38f 100644
--- a/arch/x86/include/asm/apicdef.h
+++ b/arch/x86/include/asm/apicdef.h
@@ -14,6 +14,7 @@
#define APIC_LVR 0x30
#define APIC_LVR_MASK 0xFF00FF
+#define APIC_LVR_DIRECTED_EOI (1 << 24)
#define GET_APIC_VERSION(x) ((x) & 0xFFu)
#define GET_APIC_MAXLVT(x) (((x) >> 16) & 0xFFu)
#ifdef CONFIG_X86_32
@@ -40,6 +41,7 @@
#define APIC_DFR_CLUSTER 0x0FFFFFFFul
#define APIC_DFR_FLAT 0xFFFFFFFFul
#define APIC_SPIV 0xF0
+#define APIC_SPIV_DIRECTED_EOI (1 << 12)
#define APIC_SPIV_FOCUS_DISABLED (1 << 9)
#define APIC_SPIV_APIC_ENABLED (1 << 8)
#define APIC_ISR 0x100
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2e02865..db0c6ae 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -54,7 +54,8 @@
#define APIC_LVT_NUM 6
/* 14 is the version for Xeon and Pentium 8.4.8*/
-#define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16))
+#define APIC_VERSION (0x14UL | ((APIC_LVT_NUM - 1) << 16) | \
+ APIC_LVR_DIRECTED_EOI)
#define LAPIC_MMIO_LENGTH (1 << 12)
/* followed define is not in apicdef.h */
#define APIC_SHORT_MASK 0xc0000
@@ -442,9 +443,11 @@ static void apic_set_eoi(struct kvm_lapic *apic)
trigger_mode = IOAPIC_LEVEL_TRIG;
else
trigger_mode = IOAPIC_EDGE_TRIG;
- mutex_lock(&apic->vcpu->kvm->irq_lock);
- kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
- mutex_unlock(&apic->vcpu->kvm->irq_lock);
+ if (!(apic_get_reg(apic, APIC_SPIV) & APIC_SPIV_DIRECTED_EOI)) {
+ mutex_lock(&apic->vcpu->kvm->irq_lock);
+ kvm_ioapic_update_eoi(apic->vcpu->kvm, vector, trigger_mode);
+ mutex_unlock(&apic->vcpu->kvm->irq_lock);
+ }
}
static void apic_send_ipi(struct kvm_lapic *apic)
@@ -683,7 +686,7 @@ static void apic_mmio_write(struct kvm_io_device *this,
break;
case APIC_SPIV:
- apic_set_reg(apic, APIC_SPIV, val & 0x3ff);
+ apic_set_reg(apic, APIC_SPIV, val & 0xfff);
if (!(val & APIC_SPIV_APIC_ENABLED)) {
int i;
u32 lvt_val;
--
1.6.2.1
--
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