passthrough: MSI-INTx translation for HVM
The patch adds a new type of pt_irq: PT_IRQ_TYPE_MSI_TRANSLATE.
With it, guest dpci irq can now use msi as the underlying pirq
while injected as INTx irq.
Signed-off-by: Qing He <qing.he@xxxxxxxxx>
---
diff -r e2f36d066b7b -r d11b806ed94f tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c Mon Dec 22 13:48:40 2008 +0000
+++ b/tools/libxc/xc_domain.c Sun Jan 04 17:41:53 2009 +0800
@@ -888,7 +888,8 @@
bind->hvm_domid = domid;
bind->irq_type = irq_type;
bind->machine_irq = machine_irq;
- if ( irq_type == PT_IRQ_TYPE_PCI )
+ if ( irq_type == PT_IRQ_TYPE_PCI ||
+ irq_type == PT_IRQ_TYPE_MSI_TRANSLATE )
{
bind->u.pci.bus = bus;
bind->u.pci.device = device;
diff -r e2f36d066b7b -r d11b806ed94f xen/arch/x86/hvm/vmsi.c
--- a/xen/arch/x86/hvm/vmsi.c Mon Dec 22 13:48:40 2008 +0000
+++ b/xen/arch/x86/hvm/vmsi.c Sun Jan 04 17:41:53 2009 +0800
@@ -134,7 +134,7 @@
"vector=%x trig_mode=%x\n",
dest, dest_mode, delivery_mode, vector, trig_mode);
- if ( !test_bit(_HVM_IRQ_DPCI_MSI, &hvm_irq_dpci->mirq[pirq].flags) )
+ if ( !( hvm_irq_dpci->mirq[pirq].flags & HVM_IRQ_DPCI_GUEST_MSI ) )
{
gdprintk(XENLOG_WARNING, "pirq %x not msi \n", pirq);
return 0;
diff -r e2f36d066b7b -r d11b806ed94f xen/drivers/passthrough/io.c
--- a/xen/drivers/passthrough/io.c Mon Dec 22 13:48:40 2008 +0000
+++ b/xen/drivers/passthrough/io.c Sun Jan 04 17:41:53 2009 +0800
@@ -23,6 +23,11 @@
#include <asm/hvm/irq.h>
#include <asm/hvm/iommu.h>
#include <xen/hvm/irq.h>
+
+static int pt_irq_need_timer(uint32_t flags)
+{
+ return !(flags & (HVM_IRQ_DPCI_GUEST_MSI | HVM_IRQ_DPCI_TRANSLATE));
+}
static void pt_irq_time_out(void *data)
{
@@ -93,7 +98,8 @@
if ( !test_and_set_bit(pirq, hvm_irq_dpci->mapping))
{
- set_bit(_HVM_IRQ_DPCI_MSI, &hvm_irq_dpci->mirq[pirq].flags);
+ hvm_irq_dpci->mirq[pirq].flags = HVM_IRQ_DPCI_MACH_MSI |
+ HVM_IRQ_DPCI_GUEST_MSI;
hvm_irq_dpci->mirq[pirq].gmsi.gvec = pt_irq_bind->u.msi.gvec;
hvm_irq_dpci->mirq[pirq].gmsi.gflags = pt_irq_bind->u.msi.gflags;
hvm_irq_dpci->msi_gvec_pirq[pt_irq_bind->u.msi.gvec] = pirq;
@@ -104,7 +110,7 @@
hvm_irq_dpci->msi_gvec_pirq[pt_irq_bind->u.msi.gvec] = 0;
hvm_irq_dpci->mirq[pirq].gmsi.gflags = 0;
hvm_irq_dpci->mirq[pirq].gmsi.gvec = 0;
- clear_bit(_HVM_IRQ_DPCI_MSI, &hvm_irq_dpci->mirq[pirq].flags);
+ hvm_irq_dpci->mirq[pirq].flags = 0;
clear_bit(pirq, hvm_irq_dpci->mapping);
spin_unlock(&d->event_lock);
return rc;
@@ -150,17 +156,33 @@
if ( !test_and_set_bit(machine_gsi, hvm_irq_dpci->mapping))
{
unsigned int vector = domain_irq_to_vector(d, machine_gsi);
+ unsigned int share;
hvm_irq_dpci->mirq[machine_gsi].dom = d;
+ if ( pt_irq_bind->irq_type == PT_IRQ_TYPE_MSI_TRANSLATE )
+ {
+ hvm_irq_dpci->mirq[machine_gsi].flags = HVM_IRQ_DPCI_MACH_MSI |
+ HVM_IRQ_DPCI_GUEST_PCI
|
+ HVM_IRQ_DPCI_TRANSLATE;
+ share = 0;
+ }
+ else /* PT_IRQ_TYPE_PCI */
+ {
+ hvm_irq_dpci->mirq[machine_gsi].flags = HVM_IRQ_DPCI_MACH_PCI |
+ HVM_IRQ_DPCI_GUEST_PCI;
+ share = BIND_PIRQ__WILL_SHARE;
+ }
/* Init timer before binding */
- init_timer(&hvm_irq_dpci->hvm_timer[vector],
- pt_irq_time_out, &hvm_irq_dpci->mirq[machine_gsi], 0);
+ if ( pt_irq_need_timer(hvm_irq_dpci->mirq[machine_gsi].flags) )
+ init_timer(&hvm_irq_dpci->hvm_timer[vector],
+ pt_irq_time_out, &hvm_irq_dpci->mirq[machine_gsi],
0);
/* Deal with gsi for legacy devices */
- rc = pirq_guest_bind(d->vcpu[0], machine_gsi,
BIND_PIRQ__WILL_SHARE);
+ rc = pirq_guest_bind(d->vcpu[0], machine_gsi, share);
if ( unlikely(rc) )
{
- kill_timer(&hvm_irq_dpci->hvm_timer[vector]);
+ if ( pt_irq_need_timer(hvm_irq_dpci->mirq[machine_gsi].flags) )
+ kill_timer(&hvm_irq_dpci->hvm_timer[vector]);
hvm_irq_dpci->mirq[machine_gsi].dom = NULL;
clear_bit(machine_gsi, hvm_irq_dpci->mapping);
hvm_irq_dpci->girq[guest_gsi].machine_gsi = 0;
@@ -237,7 +259,8 @@
if ( list_empty(&hvm_irq_dpci->mirq[machine_gsi].digl_list) )
{
pirq_guest_unbind(d, machine_gsi);
- kill_timer(&hvm_irq_dpci->hvm_timer[domain_irq_to_vector(d,
machine_gsi)]);
+ if ( pt_irq_need_timer(hvm_irq_dpci->mirq[machine_gsi].flags) )
+ kill_timer(&hvm_irq_dpci->hvm_timer[domain_irq_to_vector(d,
machine_gsi)]);
hvm_irq_dpci->mirq[machine_gsi].dom = NULL;
hvm_irq_dpci->mirq[machine_gsi].flags = 0;
clear_bit(machine_gsi, hvm_irq_dpci->mapping);
@@ -267,7 +290,7 @@
* PIC) and we need to detect that.
*/
set_bit(mirq, dpci->dirq_mask);
- if ( !test_bit(_HVM_IRQ_DPCI_MSI, &dpci->mirq[mirq].flags) )
+ if ( pt_irq_need_timer(dpci->mirq[mirq].flags) )
set_timer(&dpci->hvm_timer[domain_irq_to_vector(d, mirq)],
NOW() + PT_IRQ_TIME_OUT);
vcpu_kick(d->vcpu[0]);
@@ -276,35 +299,40 @@
}
#ifdef SUPPORT_MSI_REMAPPING
+/* called with d->event_lock held */
+static void __msi_pirq_eoi(struct domain *d, int pirq)
+{
+ struct hvm_irq_dpci *hvm_irq_dpci = d->arch.hvm_domain.irq.dpci;
+ irq_desc_t *desc;
+
+ if ( ( pirq >= 0 ) && ( pirq < NR_IRQS ) &&
+ test_bit(pirq, hvm_irq_dpci->mapping) &&
+ ( hvm_irq_dpci->mirq[pirq].flags & HVM_IRQ_DPCI_MACH_MSI) )
+ {
+ BUG_ON(!local_irq_is_enabled());
+ desc = domain_spin_lock_irq_desc(d, pirq, NULL);
+ if ( !desc )
+ return;
+
+ desc->status &= ~IRQ_INPROGRESS;
+ spin_unlock_irq(&desc->lock);
+
+ pirq_guest_eoi(d, pirq);
+ }
+}
+
void hvm_dpci_msi_eoi(struct domain *d, int vector)
{
struct hvm_irq_dpci *hvm_irq_dpci = d->arch.hvm_domain.irq.dpci;
- irq_desc_t *desc;
int pirq;
if ( !iommu_enabled || (hvm_irq_dpci == NULL) )
return;
spin_lock(&d->event_lock);
+
pirq = hvm_irq_dpci->msi_gvec_pirq[vector];
-
- if ( ( pirq >= 0 ) && (pirq < NR_IRQS) &&
- test_bit(pirq, hvm_irq_dpci->mapping) &&
- (test_bit(_HVM_IRQ_DPCI_MSI, &hvm_irq_dpci->mirq[pirq].flags)))
- {
- BUG_ON(!local_irq_is_enabled());
- desc = domain_spin_lock_irq_desc(d, pirq, NULL);
- if (!desc)
- {
- spin_unlock(&d->event_lock);
- return;
- }
-
- desc->status &= ~IRQ_INPROGRESS;
- spin_unlock_irq(&desc->lock);
-
- pirq_guest_eoi(d, pirq);
- }
+ __msi_pirq_eoi(d, pirq);
spin_unlock(&d->event_lock);
}
@@ -336,14 +364,15 @@
spin_lock(&d->event_lock);
#ifdef SUPPORT_MSI_REMAPPING
- if ( test_bit(_HVM_IRQ_DPCI_MSI, &hvm_irq_dpci->mirq[irq].flags) )
+ if ( hvm_irq_dpci->mirq[irq].flags & HVM_IRQ_DPCI_GUEST_MSI )
{
hvm_pci_msi_assert(d, irq);
spin_unlock(&d->event_lock);
continue;
}
#endif
- stop_timer(&hvm_irq_dpci->hvm_timer[domain_irq_to_vector(d, irq)]);
+ if ( pt_irq_need_timer(hvm_irq_dpci->mirq[irq].flags) )
+ stop_timer(&hvm_irq_dpci->hvm_timer[domain_irq_to_vector(d, irq)]);
list_for_each_entry ( digl, &hvm_irq_dpci->mirq[irq].digl_list, list )
{
@@ -351,6 +380,14 @@
intx = digl->intx;
hvm_pci_intx_assert(d, device, intx);
hvm_irq_dpci->mirq[irq].pending++;
+
+#ifdef SUPPORT_MSI_REMAPPING
+ if ( hvm_irq_dpci->mirq[irq].flags & HVM_IRQ_DPCI_TRANSLATE )
+ {
+ /* for translated MSI to INTx interrupt, eoi as early as
possible */
+ __msi_pirq_eoi(d, irq);
+ }
+#endif
}
/*
@@ -360,8 +397,9 @@
* guest will never deal with the irq, then the physical interrupt line
* will never be deasserted.
*/
- set_timer(&hvm_irq_dpci->hvm_timer[domain_irq_to_vector(d, irq)],
- NOW() + PT_IRQ_TIME_OUT);
+ if ( pt_irq_need_timer(hvm_irq_dpci->mirq[irq].flags) )
+ set_timer(&hvm_irq_dpci->hvm_timer[domain_irq_to_vector(d, irq)],
+ NOW() + PT_IRQ_TIME_OUT);
spin_unlock(&d->event_lock);
}
}
@@ -405,9 +443,12 @@
* No need to get vector lock for timer
* since interrupt is still not EOIed
*/
- stop_timer(&hvm_irq_dpci->hvm_timer[
- domain_irq_to_vector(d, machine_gsi)]);
- pirq_guest_eoi(d, machine_gsi);
+ if ( pt_irq_need_timer(hvm_irq_dpci->mirq[machine_gsi].flags) )
+ {
+ stop_timer(&hvm_irq_dpci->hvm_timer[
+ domain_irq_to_vector(d, machine_gsi)]);
+ pirq_guest_eoi(d, machine_gsi);
+ }
}
}
spin_unlock(&d->event_lock);
diff -r e2f36d066b7b -r d11b806ed94f xen/include/public/domctl.h
--- a/xen/include/public/domctl.h Mon Dec 22 13:48:40 2008 +0000
+++ b/xen/include/public/domctl.h Sun Jan 04 17:41:53 2009 +0800
@@ -466,6 +466,7 @@
PT_IRQ_TYPE_PCI,
PT_IRQ_TYPE_ISA,
PT_IRQ_TYPE_MSI,
+ PT_IRQ_TYPE_MSI_TRANSLATE,
} pt_irq_type_t;
struct xen_domctl_bind_pt_irq {
uint32_t machine_irq;
diff -r e2f36d066b7b -r d11b806ed94f xen/include/xen/hvm/irq.h
--- a/xen/include/xen/hvm/irq.h Mon Dec 22 13:48:40 2008 +0000
+++ b/xen/include/xen/hvm/irq.h Sun Jan 04 17:41:53 2009 +0800
@@ -35,7 +35,16 @@
uint8_t link;
};
-#define _HVM_IRQ_DPCI_MSI 0x1
+#define _HVM_IRQ_DPCI_MACH_PCI_SHIFT 0
+#define _HVM_IRQ_DPCI_MACH_MSI_SHIFT 1
+#define _HVM_IRQ_DPCI_GUEST_PCI_SHIFT 4
+#define _HVM_IRQ_DPCI_GUEST_MSI_SHIFT 5
+#define _HVM_IRQ_DPCI_TRANSLATE_SHIFT 15
+#define HVM_IRQ_DPCI_MACH_PCI (1 << _HVM_IRQ_DPCI_MACH_PCI_SHIFT)
+#define HVM_IRQ_DPCI_MACH_MSI (1 << _HVM_IRQ_DPCI_MACH_MSI_SHIFT)
+#define HVM_IRQ_DPCI_GUEST_PCI (1 << _HVM_IRQ_DPCI_GUEST_PCI_SHIFT)
+#define HVM_IRQ_DPCI_GUEST_MSI (1 << _HVM_IRQ_DPCI_GUEST_MSI_SHIFT)
+#define HVM_IRQ_DPCI_TRANSLATE (1 << _HVM_IRQ_DPCI_TRANSLATE_SHIFT)
struct hvm_gmsi_info {
uint32_t gvec;
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