[Xen-devel] [RFC v2 10/15] vmx: Define two per-cpu variables

[Feng Wu <feng.wu@xxxxxxxxx>]

This patch defines two per-cpu variables:

blocked_vcpu:
A list storing the vCPUs which were blocked on this pCPU.

blocked_vcpu_lock:
The spinlock to protect blocked_vcpu.

Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c       | 3 +++
 xen/arch/x86/hvm/vmx/vmx.c        | 7 +++++++
 xen/include/asm-x86/hvm/vmx/vmx.h | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index f60a454..8166f08 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -585,6 +585,9 @@ int vmx_cpu_up(void)
     if ( cpu_has_vmx_vpid )
         vpid_sync_all();
 
+    INIT_LIST_HEAD(&per_cpu(blocked_vcpu, cpu));
+    spin_lock_init(&per_cpu(blocked_vcpu_lock, cpu));
+
     return 0;
 }
 
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 6c4f78c..2451ca5 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -82,6 +82,13 @@ static int vmx_msr_read_intercept(unsigned int msr, uint64_t 
*msr_content);
 static int vmx_msr_write_intercept(unsigned int msr, uint64_t msr_content);
 static void vmx_invlpg_intercept(unsigned long vaddr);
 
+/*
+ * We maintian a per-CPU linked-list of vCPU, so in PI wakeup handler we
+ * can find which vCPU should be waken up.
+ */
+DEFINE_PER_CPU(struct list_head, blocked_vcpu);
+DEFINE_PER_CPU(spinlock_t, blocked_vcpu_lock);
+
 uint8_t __read_mostly posted_intr_vector;
 
 static int vmx_domain_initialise(struct domain *d)
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h 
b/xen/include/asm-x86/hvm/vmx/vmx.h
index e4292cc..0d11f9c 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -30,6 +30,9 @@
 #include <asm/hvm/vmx/vmcs.h>
 #include <asm/apic.h>
 
+DECLARE_PER_CPU(struct list_head, blocked_vcpu);
+DECLARE_PER_CPU(spinlock_t, blocked_vcpu_lock);
+
 extern uint8_t posted_intr_vector;
 
 typedef union {
-- 
2.1.0


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