[Xen-devel] [PATCH 2/2] x86, hvm: Allow delivery of timer interrupts to VCPUs != 0

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

# HG changeset patch
# User Kouya Shimura <kouya@xxxxxxxxxxxxxx>
# Date 1246862381 -32400
# Node ID a0d51bbdca910b3ea25cdb8e6f533a01af332a8e
# Parent  73e220236f6e50ac8de2470e88e91b75e3c2d01f
x86,hvm: Allow delivery of timer interrupts to VCPUs != 0

This patch is needed for kexec/kdump since VCPU#0 is halted.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

diff -r 73e220236f6e -r a0d51bbdca91 xen/arch/x86/hvm/hpet.c
--- a/xen/arch/x86/hvm/hpet.c   Mon Jul 06 14:54:09 2009 +0900
+++ b/xen/arch/x86/hvm/hpet.c   Mon Jul 06 15:39:41 2009 +0900
@@ -28,7 +28,7 @@
 #define vcpu_vhpet(vcpu)   (domain_vhpet((vcpu)->domain))
 #define vhpet_domain(hpet) (container_of((hpet), struct domain, \
                                          arch.hvm_domain.pl_time.vhpet))
-#define vhpet_vcpu(hpet)   (vhpet_domain(hpet)->vcpu[0])
+#define vhpet_vcpu(hpet)   (pt_i8259_target(vhpet_domain(hpet)))
 
 #define HPET_BASE_ADDRESS   0xfed00000ULL
 #define HPET_MMAP_SIZE      1024
diff -r 73e220236f6e -r a0d51bbdca91 xen/arch/x86/hvm/i8254.c
--- a/xen/arch/x86/hvm/i8254.c  Mon Jul 06 14:54:09 2009 +0900
+++ b/xen/arch/x86/hvm/i8254.c  Mon Jul 06 15:39:41 2009 +0900
@@ -42,7 +42,7 @@
 #define vcpu_vpit(vcpu)  (domain_vpit((vcpu)->domain))
 #define vpit_domain(pit) (container_of((pit), struct domain, \
                                        arch.hvm_domain.pl_time.vpit))
-#define vpit_vcpu(pit)   (vpit_domain(pit)->vcpu[0])
+#define vpit_vcpu(pit)   (pt_i8259_target(vpit_domain(pit)))
 
 #define RW_STATE_LSB 1
 #define RW_STATE_MSB 2
diff -r 73e220236f6e -r a0d51bbdca91 xen/arch/x86/hvm/rtc.c
--- a/xen/arch/x86/hvm/rtc.c    Mon Jul 06 14:54:09 2009 +0900
+++ b/xen/arch/x86/hvm/rtc.c    Mon Jul 06 15:39:41 2009 +0900
@@ -32,7 +32,7 @@
 #define vcpu_vrtc(vcpu)  (domain_vrtc((vcpu)->domain))
 #define vrtc_domain(rtc) (container_of((rtc), struct domain, \
                                        arch.hvm_domain.pl_time.vrtc))
-#define vrtc_vcpu(rtc)   (vrtc_domain(rtc)->vcpu[0])
+#define vrtc_vcpu(rtc)   (pt_i8259_target(vrtc_domain(rtc)))
 
 static void rtc_periodic_cb(struct vcpu *v, void *opaque)
 {
diff -r 73e220236f6e -r a0d51bbdca91 xen/arch/x86/hvm/vlapic.c
--- a/xen/arch/x86/hvm/vlapic.c Mon Jul 06 14:54:09 2009 +0900
+++ b/xen/arch/x86/hvm/vlapic.c Mon Jul 06 15:39:41 2009 +0900
@@ -814,7 +814,11 @@ void vlapic_adjust_i8259_target(struct d
     v = d->vcpu ? d->vcpu[0] : NULL;
 
  found:
-    d->arch.hvm_domain.i8259_target = v;
+    if ( d->arch.hvm_domain.i8259_target != v )
+    {
+        d->arch.hvm_domain.i8259_target = v;
+        pt_adjust_i8259_target(v);
+    }
 }
 
 int vlapic_has_pending_irq(struct vcpu *v)
diff -r 73e220236f6e -r a0d51bbdca91 xen/arch/x86/hvm/vpt.c
--- a/xen/arch/x86/hvm/vpt.c    Mon Jul 06 14:54:09 2009 +0900
+++ b/xen/arch/x86/hvm/vpt.c    Mon Jul 06 15:39:41 2009 +0900
@@ -437,3 +437,53 @@ void destroy_periodic_time(struct period
      */
     kill_timer(&pt->timer);
 }
+
+static void pt_adjust_vcpu(struct periodic_time *pt, struct vcpu *v)
+{
+    int on_list;
+
+    ASSERT(pt->source == PTSRC_isa);
+
+    if ( pt->vcpu == NULL )
+        return;
+
+    pt_lock(pt);
+    on_list = pt->on_list;
+    if ( pt->on_list )
+        list_del(&pt->list);
+    pt->on_list = 0;
+    pt_unlock(pt);
+
+    spin_lock(&v->arch.hvm_vcpu.tm_lock);
+    pt->vcpu = v;
+    if ( on_list )
+    {
+        pt->on_list = 1;
+        list_add(&pt->list, &v->arch.hvm_vcpu.tm_list);
+
+        migrate_timer(&pt->timer, v->processor);
+    }
+    spin_unlock(&v->arch.hvm_vcpu.tm_lock);
+}
+
+void pt_adjust_i8259_target(struct vcpu *v)
+{
+    struct pl_time *pl_time = &v->domain->arch.hvm_domain.pl_time;
+    int i;
+
+    if ( v == NULL )
+        return;
+
+    spin_lock(&pl_time->vpit.lock);
+    pt_adjust_vcpu(&pl_time->vpit.pt0, v);
+    spin_unlock(&pl_time->vpit.lock);
+
+    spin_lock(&pl_time->vrtc.lock);
+    pt_adjust_vcpu(&pl_time->vrtc.pt, v);
+    spin_unlock(&pl_time->vrtc.lock);
+
+    spin_lock(&pl_time->vhpet.lock);
+    for ( i = 0; i < HPET_TIMER_NUM; i++ )
+        pt_adjust_vcpu(&pl_time->vhpet.pt[i], v);
+    spin_unlock(&pl_time->vhpet.lock);
+}
diff -r 73e220236f6e -r a0d51bbdca91 xen/include/asm-x86/hvm/vpt.h
--- a/xen/include/asm-x86/hvm/vpt.h     Mon Jul 06 14:54:09 2009 +0900
+++ b/xen/include/asm-x86/hvm/vpt.h     Mon Jul 06 15:39:41 2009 +0900
@@ -141,6 +141,10 @@ void pt_intr_post(struct vcpu *v, struct
 void pt_intr_post(struct vcpu *v, struct hvm_intack intack);
 void pt_reset(struct vcpu *v);
 void pt_migrate(struct vcpu *v);
+void pt_adjust_i8259_target(struct vcpu *v);
+
+#define pt_i8259_target(d) \
+    ((d)->arch.hvm_domain.i8259_target ? : (d)->vcpu[0])
 
 /* Is given periodic timer active? */
 #define pt_active(pt) ((pt)->on_list)

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