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Subject[PATCH v2 2/2] KVM: LAPIC: Don't need to clear IPI delivery status in x2apic mode
Date
From: Wanpeng Li <wanpengli@tencent.com>

IPI delivery status field is not present in x2apic mode, don't need
to clear IPI delivery status in x2apic mode.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
v1 -> v2:
* update code comments
* update subject and patch description

arch/x86/kvm/lapic.c | 5 +++--
arch/x86/kvm/x86.c | 1 -
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index d528bed..5efca58 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1941,8 +1941,9 @@ int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
break;
}
case APIC_ICR:
- /* No delay here, so we always clear the pending bit */
- val &= ~(1 << 12);
+ /* Immediately clear Delivery Status in xAPIC mode */
+ if (!apic_x2apic_mode(apic))
+ val &= ~(1 << 12);
kvm_apic_send_ipi(apic, val, kvm_lapic_get_reg(apic, APIC_ICR2));
kvm_lapic_set_reg(apic, APIC_ICR, val);
break;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5a645df..ececc09 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1562,7 +1562,6 @@ static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data
((data & APIC_MODE_MASK) == APIC_DM_FIXED) &&
((u32)(data >> 32) != X2APIC_BROADCAST)) {

- data &= ~(1 << 12);
kvm_apic_send_ipi(vcpu->arch.apic, (u32)data, (u32)(data >> 32));
kvm_lapic_set_reg(vcpu->arch.apic, APIC_ICR2, (u32)(data >> 32));
kvm_lapic_set_reg(vcpu->arch.apic, APIC_ICR, (u32)data);
--
2.7.4
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