On 25/03/15 12:31, Feng Wu wrote:
This patch adds a global vector which is used to wake up
the blocked vCPU when an interrupt is being posted to it.
Signed-off-by: Feng Wu <feng...@intel.com>
Suggested-by: Yang Zhang <yang.z.zh...@intel.com>
---
xen/arch/x86/hvm/vmx/vmx.c | 33 +++++++++++++++++++++++++++++++++
xen/include/asm-x86/hvm/hvm.h | 1 +
xen/include/asm-x86/hvm/vmx/vmx.h | 3 +++
xen/include/xen/sched.h | 2 ++
4 files changed, 39 insertions(+)
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index ff5544d..b2b4c26 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -89,6 +89,7 @@ DEFINE_PER_CPU(struct list_head, blocked_vcpu_on_cpu);
DEFINE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock);
uint8_t __read_mostly posted_intr_vector;
+uint8_t __read_mostly pi_wakeup_vector;
static int vmx_domain_initialise(struct domain *d)
{
@@ -131,6 +132,8 @@ static int vmx_vcpu_initialise(struct vcpu *v)
if ( v->vcpu_id == 0 )
v->arch.user_regs.eax = 1;
+ INIT_LIST_HEAD(&v->blocked_vcpu_list);
+
return 0;
}
@@ -1834,11 +1837,19 @@ 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);
+
+ if ( iommu_intpost )
+ alloc_direct_apic_vector(&pi_wakeup_vector, pi_wakeup_interrupt);
+ else
+ vmx_function_table.pi_desc_update = NULL;
+ }
else
{
vmx_function_table.deliver_posted_intr = NULL;
vmx_function_table.sync_pir_to_irr = NULL;
+ vmx_function_table.pi_desc_update = NULL;
}
if ( cpu_has_vmx_ept
@@ -3255,6 +3266,28 @@ void vmx_vmenter_helper(const struct cpu_user_regs *regs)
}
/*
+ * Handle VT-d posted-interrupt when VCPU is blocked.
+ */
+void pi_wakeup_interrupt(struct cpu_user_regs *regs)
+{
+ struct vcpu *v;
+ int cpu = smp_processor_id();
unsigned int
~Andrew
+
+ spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu));
+ list_for_each_entry(v, &per_cpu(blocked_vcpu_on_cpu, cpu),
+ blocked_vcpu_list) {
+ struct pi_desc *pi_desc = &v->arch.hvm_vmx.pi_desc;
+
+ if ( pi_test_on(pi_desc) == 1 )
+ tasklet_schedule(&v->vcpu_wakeup_tasklet);
+ }
+ spin_unlock(&per_cpu(blocked_vcpu_on_cpu_lock, cpu));
+
+ ack_APIC_irq();
+ this_cpu(irq_count)++;
+}
+
+/*
* Local variables:
* mode: C
* c-file-style: "BSD"
diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
index 0dc909b..a11a256 100644
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -195,6 +195,7 @@ struct hvm_function_table {
void (*deliver_posted_intr)(struct vcpu *v, u8 vector);
void (*sync_pir_to_irr)(struct vcpu *v);
void (*handle_eoi)(u8 vector);
+ void (*pi_desc_update)(struct vcpu *v, int new_state);
/*Walk nested p2m */
int (*nhvm_hap_walk_L1_p2m)(struct vcpu *v, paddr_t L2_gpa,
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h
b/xen/include/asm-x86/hvm/vmx/vmx.h
index e643c3c..f4296ab 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -34,6 +34,7 @@ DECLARE_PER_CPU(struct list_head, blocked_vcpu_on_cpu);
DECLARE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock);
extern uint8_t posted_intr_vector;
+extern uint8_t pi_wakeup_vector;
typedef union {
struct {
@@ -574,6 +575,8 @@ int alloc_p2m_hap_data(struct p2m_domain *p2m);
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);
+
/* EPT violation qualifications definitions */
#define _EPT_READ_VIOLATION 0
#define EPT_READ_VIOLATION (1UL<<_EPT_READ_VIOLATION)
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index c874dd4..91f0912 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -148,6 +148,8 @@ struct vcpu
struct vcpu *next_in_list;
+ struct list_head blocked_vcpu_list;
+
s_time_t periodic_period;
s_time_t periodic_last_event;
struct timer periodic_timer;
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
