Hi all,
this patch is the reduced version of the previous "enhanced PV on HVM"
patch for Xen.
The only purpose of this patch is to add the new vector based callback
mechanism needed by Linux PV on HVM.
No pirq remapping for Linux HVM guests is supported.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
---
diff -r 3bb163b74673 xen/arch/x86/hvm/irq.c
--- a/xen/arch/x86/hvm/irq.c Fri Feb 12 09:24:18 2010 +0000
+++ b/xen/arch/x86/hvm/irq.c Wed Mar 10 16:00:33 2010 +0000
@@ -185,16 +185,16 @@
void hvm_assert_evtchn_irq(struct vcpu *v)
{
- if ( v->vcpu_id != 0 )
- return;
-
if ( unlikely(in_irq() || !local_irq_is_enabled()) )
{
tasklet_schedule(&v->arch.hvm_vcpu.assert_evtchn_irq_tasklet);
return;
}
- hvm_set_callback_irq_level(v);
+ if (is_hvm_pv_evtchn_vcpu(v))
+ vcpu_kick(v);
+ else
+ hvm_set_callback_irq_level(v);
}
void hvm_set_pci_link_route(struct domain *d, u8 link, u8 isa_irq)
@@ -251,7 +251,7 @@
via_type = (uint8_t)(via >> 56) + 1;
if ( ((via_type == HVMIRQ_callback_gsi) && (via == 0)) ||
- (via_type > HVMIRQ_callback_pci_intx) )
+ (via_type > HVMIRQ_callback_vector) )
via_type = HVMIRQ_callback_none;
spin_lock(&d->arch.hvm_domain.irq_lock);
@@ -297,6 +297,9 @@
if ( hvm_irq->callback_via_asserted )
__hvm_pci_intx_assert(d, pdev, pintx);
break;
+ case HVMIRQ_callback_vector:
+ hvm_irq->callback_via.vector = (uint8_t)via;
+ break;
default:
break;
}
@@ -312,6 +315,10 @@
case HVMIRQ_callback_pci_intx:
printk("PCI INTx Dev 0x%02x Int%c\n", pdev, 'A' + pintx);
break;
+ case HVMIRQ_callback_vector:
+ printk("Set HVMIRQ_callback_vector to %u\n",
+ hvm_irq->callback_via.vector);
+ break;
default:
printk("None\n");
break;
@@ -323,6 +330,10 @@
struct hvm_domain *plat = &v->domain->arch.hvm_domain;
int vector;
+ if (plat->irq.callback_via_type == HVMIRQ_callback_vector &&
+ vcpu_info(v, evtchn_upcall_pending))
+ return hvm_intack_vector(plat->irq.callback_via.vector);
+
if ( unlikely(v->nmi_pending) )
return hvm_intack_nmi;
@@ -363,6 +374,8 @@
case hvm_intsrc_lapic:
if ( !vlapic_ack_pending_irq(v, intack.vector) )
intack = hvm_intack_none;
+ break;
+ case hvm_intsrc_vector:
break;
default:
intack = hvm_intack_none;
diff -r 3bb163b74673 xen/arch/x86/hvm/vmx/intr.c
--- a/xen/arch/x86/hvm/vmx/intr.c Fri Feb 12 09:24:18 2010 +0000
+++ b/xen/arch/x86/hvm/vmx/intr.c Wed Mar 10 16:00:33 2010 +0000
@@ -164,7 +164,8 @@
{
HVMTRACE_2D(INJ_VIRQ, intack.vector, /*fake=*/ 0);
vmx_inject_extint(intack.vector);
- pt_intr_post(v, intack);
+ if (intack.source != hvm_intsrc_vector)
+ pt_intr_post(v, intack);
}
/* Is there another IRQ to queue up behind this one? */
diff -r 3bb163b74673 xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h Fri Feb 12 09:24:18 2010 +0000
+++ b/xen/include/asm-x86/hvm/hvm.h Wed Mar 10 16:00:33 2010 +0000
@@ -33,7 +33,8 @@
hvm_intsrc_pic,
hvm_intsrc_lapic,
hvm_intsrc_nmi,
- hvm_intsrc_mce
+ hvm_intsrc_mce,
+ hvm_intsrc_vector
};
struct hvm_intack {
uint8_t source; /* enum hvm_intsrc */
@@ -44,6 +45,7 @@
#define hvm_intack_lapic(vec) ( (struct hvm_intack) { hvm_intsrc_lapic, vec } )
#define hvm_intack_nmi ( (struct hvm_intack) { hvm_intsrc_nmi, 2 } )
#define hvm_intack_mce ( (struct hvm_intack) { hvm_intsrc_mce, 18 } )
+#define hvm_intack_vector(vec)( (struct hvm_intack) { hvm_intsrc_vector, vec }
)
enum hvm_intblk {
hvm_intblk_none, /* not blocked (deliverable) */
hvm_intblk_shadow, /* MOV-SS or STI shadow */
diff -r 3bb163b74673 xen/include/asm-x86/hvm/irq.h
--- a/xen/include/asm-x86/hvm/irq.h Fri Feb 12 09:24:18 2010 +0000
+++ b/xen/include/asm-x86/hvm/irq.h Wed Mar 10 16:00:33 2010 +0000
@@ -54,12 +54,14 @@
enum {
HVMIRQ_callback_none,
HVMIRQ_callback_gsi,
- HVMIRQ_callback_pci_intx
+ HVMIRQ_callback_pci_intx,
+ HVMIRQ_callback_vector
} callback_via_type;
};
union {
uint32_t gsi;
struct { uint8_t dev, intx; } pci;
+ uint32_t vector;
} callback_via;
/* Number of INTx wires asserting each PCI-ISA link. */
diff -r 3bb163b74673 xen/include/xen/sched.h
--- a/xen/include/xen/sched.h Fri Feb 12 09:24:18 2010 +0000
+++ b/xen/include/xen/sched.h Wed Mar 10 16:00:33 2010 +0000
@@ -592,6 +592,9 @@
#define VM_ASSIST(_d,_t) (test_bit((_t), &(_d)->vm_assist))
#define is_hvm_domain(d) ((d)->is_hvm)
+#define is_hvm_pv_evtchn_domain(d) (is_hvm_domain(d) && \
+ d->arch.hvm_domain.irq.callback_via_type == HVMIRQ_callback_vector)
+#define is_hvm_pv_evtchn_vcpu(v) (is_hvm_pv_evtchn_domain(v->domain))
#define is_hvm_vcpu(v) (is_hvm_domain(v->domain))
#define need_iommu(d) ((d)->need_iommu)
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