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[09/13] KVM: Change NDST field after VCPU scheduling

Message ID 1415600812-27773-10-git-send-email-feng.wu@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Wu, Feng Nov. 10, 2014, 6:26 a.m. UTC 
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(-)
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Patch

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)