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Subject[PATCH 09/13] KVM: Change NDST field after VCPU scheduling
Date
This patch changes the NDST filed of Posted-Interrupts
Descriptor after VCPU is scheduled to another physical
CPU.

Signed-off-by: Feng Wu <feng.wu@intel.com>
---
arch/x86/kvm/vmx.c | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4c1a966..fa77714 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1906,6 +1906,31 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
vmx->loaded_vmcs->cpu = cpu;
}
+
+ if (irq_post_enabled && (vcpu->cpu != cpu)) {
+ struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
+ struct pi_desc old, new;
+ unsigned int dest;
+
+ memset(&old, 0, sizeof(old));
+ memset(&new, 0, sizeof(new));
+
+ pi_set_sn(pi_desc);
+
+ do {
+ old.control = new.control = pi_desc->control;
+
+ dest = cpu_physical_id(cpu);
+
+ if (x2apic_mode)
+ new.ndst = dest;
+ else
+ new.ndst = (dest << 8) & 0xFF00;
+
+ } while (cmpxchg(&pi_desc->control, old.control,
+ new.control) != old.control);
+ pi_clear_sn(pi_desc);
+ }
}

static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
--
1.7.1


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