[Xen-devel] [RFC v1 12/15] vmx: Properly handle notification event when vCPU is running

[Feng Wu <feng.wu@xxxxxxxxx>]

When a vCPU is running in Root mode and a notification event
has been injected to it. we need to set VCPU_KICK_SOFTIRQ for
the current cpu, so the pending interrupt in PIRR will be
synced to vIRR before VM-Exit in time.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c        | 24 +++++++++++++++++++++++-
 xen/include/asm-x86/hvm/vmx/vmx.h |  1 +
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index b2b4c26..b30392c 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -1838,7 +1838,7 @@ const struct hvm_function_table * __init start_vmx(void)
 
     if ( cpu_has_vmx_posted_intr_processing )
     {
-        alloc_direct_apic_vector(&posted_intr_vector, event_check_interrupt);
+        alloc_direct_apic_vector(&posted_intr_vector, 
pi_notification_interrupt);
 
         if ( iommu_intpost )
             alloc_direct_apic_vector(&pi_wakeup_vector, pi_wakeup_interrupt);
@@ -3288,6 +3288,28 @@ void pi_wakeup_interrupt(struct cpu_user_regs *regs)
 }
 
 /*
+ * Handle VT-d posted-interrupt when VCPU is running.
+ */
+
+void pi_notification_interrupt(struct cpu_user_regs *regs)
+{
+    /*
+     * We get here because a vCPU is running in Root mode
+     * and a notification event has been injected to it.
+     *
+     * we need to set VCPU_KICK_SOFTIRQ for the current
+     * cpu, just like __vmx_deliver_posted_interrupt().
+     *
+     * So the pending interrupt in PIRR will be synced to
+     * vIRR before VM-Exit in time.
+     */
+    set_bit(VCPU_KICK_SOFTIRQ, &softirq_pending(smp_processor_id()));
+
+    ack_APIC_irq();
+    this_cpu(irq_count)++;
+}
+
+/*
  * Local variables:
  * mode: C
  * c-file-style: "BSD"
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h 
b/xen/include/asm-x86/hvm/vmx/vmx.h
index f4296ab..e53275b 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -576,6 +576,7 @@ void free_p2m_hap_data(struct p2m_domain *p2m);
 void p2m_init_hap_data(struct p2m_domain *p2m);
 
 void pi_wakeup_interrupt(struct cpu_user_regs *regs);
+void pi_notification_interrupt(struct cpu_user_regs *regs);
 
 /* EPT violation qualifications definitions */
 #define _EPT_READ_VIOLATION         0
-- 
2.1.0


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