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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] vt-d: Allow pass-through of shared interrupts.
# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1192789618 -3600
# Node ID e733e6b73d56e014c5b2eba04564e7ee439c2b59
# Parent bc4afcd4c612afcee7f2fa2fc0ca400c26758876
vt-d: Allow pass-through of shared interrupts.
Signed-off-by: Xiaohui Xin <xiaohui.xin@xxxxxxxxx>
Signed-off-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
xen/arch/x86/hvm/svm/amd_iommu/amd-iommu-map.c | 2
xen/arch/x86/hvm/vioapic.c | 2
xen/arch/x86/hvm/vmx/intr.c | 12 +++++
xen/arch/x86/hvm/vmx/vtd/dmar.c | 8 ---
xen/arch/x86/hvm/vmx/vtd/io.c | 56 ++++++++++++++++---------
xen/arch/x86/hvm/vpic.c | 3 -
xen/include/asm-x86/hvm/io.h | 3 -
xen/include/asm-x86/hvm/irq.h | 2
xen/include/asm-x86/iommu.h | 5 +-
9 files changed, 62 insertions(+), 31 deletions(-)
diff -r bc4afcd4c612 -r e733e6b73d56
xen/arch/x86/hvm/svm/amd_iommu/amd-iommu-map.c
--- a/xen/arch/x86/hvm/svm/amd_iommu/amd-iommu-map.c Fri Oct 19 09:31:03
2007 +0100
+++ b/xen/arch/x86/hvm/svm/amd_iommu/amd-iommu-map.c Fri Oct 19 11:26:58
2007 +0100
@@ -18,10 +18,10 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <xen/sched.h>
#include <asm/hvm/iommu.h>
#include <asm/amd-iommu.h>
#include <asm/hvm/svm/amd-iommu-proto.h>
-#include <xen/sched.h>
extern long amd_iommu_poll_comp_wait;
diff -r bc4afcd4c612 -r e733e6b73d56 xen/arch/x86/hvm/vioapic.c
--- a/xen/arch/x86/hvm/vioapic.c Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/arch/x86/hvm/vioapic.c Fri Oct 19 11:26:58 2007 +0100
@@ -459,7 +459,7 @@ void vioapic_update_EOI(struct domain *d
ent->fields.remote_irr = 0;
if ( vtd_enabled )
- hvm_dpci_eoi(gsi, ent);
+ hvm_dpci_eoi(current->domain, gsi, ent);
if ( (ent->fields.trig_mode == VIOAPIC_LEVEL_TRIG) &&
!ent->fields.mask &&
diff -r bc4afcd4c612 -r e733e6b73d56 xen/arch/x86/hvm/vmx/intr.c
--- a/xen/arch/x86/hvm/vmx/intr.c Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/arch/x86/hvm/vmx/intr.c Fri Oct 19 11:26:58 2007 +0100
@@ -121,10 +121,22 @@ static void vmx_dirq_assist(struct vcpu
irq < NR_IRQS;
irq = find_next_bit(hvm_irq_dpci->dirq_mask, NR_IRQS, irq + 1) )
{
+ stop_timer(&hvm_irq_dpci->hvm_timer[irq_to_vector(irq)]);
+
test_and_clear_bit(irq, &hvm_irq_dpci->dirq_mask);
device = hvm_irq_dpci->mirq[irq].device;
intx = hvm_irq_dpci->mirq[irq].intx;
hvm_pci_intx_assert(d, device, intx);
+
+ /*
+ * Set a timer to see if the guest can finish the interrupt or not. For
+ * example, the guest OS may unmask the PIC during boot, before the
+ * guest driver is loaded. hvm_pci_intx_assert() may succeed, but the
+ * guest will never deal with the irq, then the physical interrupt line
+ * will never be deasserted.
+ */
+ set_timer(&hvm_irq_dpci->hvm_timer[irq_to_vector(irq)],
+ NOW() + PT_IRQ_TIME_OUT);
}
}
diff -r bc4afcd4c612 -r e733e6b73d56 xen/arch/x86/hvm/vmx/vtd/dmar.c
--- a/xen/arch/x86/hvm/vmx/vtd/dmar.c Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/arch/x86/hvm/vmx/vtd/dmar.c Fri Oct 19 11:26:58 2007 +0100
@@ -492,7 +492,6 @@ acpi_parse_dmar(unsigned long phys_addr,
int acpi_dmar_init(void)
{
- extern int ioapic_ack_new;
int rc;
if (!vtd_enabled)
@@ -509,8 +508,5 @@ int acpi_dmar_init(void)
return -ENODEV;
}
- /* Use fake-vector style of IOAPIC acknowledgement. */
- ioapic_ack_new = 0;
-
- return 0;
-}
+ return 0;
+}
diff -r bc4afcd4c612 -r e733e6b73d56 xen/arch/x86/hvm/vmx/vtd/io.c
--- a/xen/arch/x86/hvm/vmx/vtd/io.c Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/arch/x86/hvm/vmx/vtd/io.c Fri Oct 19 11:26:58 2007 +0100
@@ -45,6 +45,18 @@
#include <public/hvm/ioreq.h>
#include <public/domctl.h>
+static void pt_irq_time_out(void *data)
+{
+ struct hvm_irq_dpci_mapping *irq_map = data;
+ unsigned int guest_gsi, machine_gsi;
+ struct domain *d = irq_map->dom;
+
+ guest_gsi = irq_map->guest_gsi;
+ machine_gsi = d->arch.hvm_domain.irq.dpci->girq[guest_gsi].machine_gsi;
+ clear_bit(machine_gsi, d->arch.hvm_domain.irq.dpci->dirq_mask);
+ hvm_dpci_eoi(irq_map->dom, guest_gsi, NULL);
+}
+
int pt_irq_create_bind_vtd(
struct domain *d, xen_domctl_bind_pt_irq_t *pt_irq_bind)
{
@@ -76,17 +88,22 @@ int pt_irq_create_bind_vtd(
hvm_irq_dpci->mirq[machine_gsi].device = device;
hvm_irq_dpci->mirq[machine_gsi].intx = intx;
hvm_irq_dpci->mirq[machine_gsi].guest_gsi = guest_gsi;
+ hvm_irq_dpci->mirq[machine_gsi].dom = d;
hvm_irq_dpci->girq[guest_gsi].valid = 1;
hvm_irq_dpci->girq[guest_gsi].device = device;
hvm_irq_dpci->girq[guest_gsi].intx = intx;
hvm_irq_dpci->girq[guest_gsi].machine_gsi = machine_gsi;
+ hvm_irq_dpci->girq[guest_gsi].dom = d;
- /* Deal with gsi for legacy devices */
+ init_timer(&hvm_irq_dpci->hvm_timer[irq_to_vector(machine_gsi)],
+ pt_irq_time_out, &hvm_irq_dpci->mirq[machine_gsi], 0);
+
+ /* Deal with GSI for legacy devices. */
pirq_guest_bind(d->vcpu[0], machine_gsi, BIND_PIRQ__WILL_SHARE);
gdprintk(XENLOG_ERR,
- "XEN_DOMCTL_irq_mapping: m_irq = %x device = %x intx = %x\n",
- machine_gsi, device, intx);
+ "XEN_DOMCTL_irq_mapping: m_irq = %x device = %x intx = %x\n",
+ machine_gsi, device, intx);
return 0;
}
@@ -114,22 +131,25 @@ int hvm_do_IRQ_dpci(struct domain *d, un
hvm_irq->dpci->girq[isa_irq].machine_gsi = mirq;
}
- if ( !test_and_set_bit(mirq, hvm_irq->dpci->dirq_mask) )
- {
- vcpu_kick(d->vcpu[0]);
- return 1;
- }
+ /*
+ * Set a timer here to avoid situations where the IRQ line is shared, and
+ * the device belonging to the pass-through guest is not yet active. In
+ * this case the guest may not pick up the interrupt (e.g., masked at the
+ * PIC) and we need to detect that.
+ */
+ set_bit(mirq, hvm_irq->dpci->dirq_mask);
+ set_timer(&hvm_irq->dpci->hvm_timer[irq_to_vector(mirq)],
+ NOW() + PT_IRQ_TIME_OUT);
+ vcpu_kick(d->vcpu[0]);
- dprintk(XENLOG_INFO, "mirq already pending\n");
- return 0;
+ return 1;
}
-void hvm_dpci_eoi(unsigned int guest_gsi, union vioapic_redir_entry *ent)
+void hvm_dpci_eoi(struct domain *d, unsigned int guest_gsi,
+ union vioapic_redir_entry *ent)
{
- struct domain *d = current->domain;
struct hvm_irq_dpci *hvm_irq_dpci = d->arch.hvm_domain.irq.dpci;
uint32_t device, intx, machine_gsi;
- irq_desc_t *desc;
ASSERT(spin_is_locked(&d->arch.hvm_domain.irq_lock));
@@ -137,17 +157,15 @@ void hvm_dpci_eoi(unsigned int guest_gsi
!hvm_irq_dpci->girq[guest_gsi].valid )
return;
+ machine_gsi = hvm_irq_dpci->girq[guest_gsi].machine_gsi;
+ stop_timer(&hvm_irq_dpci->hvm_timer[irq_to_vector(machine_gsi)]);
device = hvm_irq_dpci->girq[guest_gsi].device;
intx = hvm_irq_dpci->girq[guest_gsi].intx;
- machine_gsi = hvm_irq_dpci->girq[guest_gsi].machine_gsi;
gdprintk(XENLOG_INFO, "hvm_dpci_eoi:: device %x intx %x\n",
device, intx);
__hvm_pci_intx_deassert(d, device, intx);
- if ( (ent == NULL) || (ent->fields.mask == 0) )
- {
- desc = &irq_desc[irq_to_vector(machine_gsi)];
- desc->handler->end(irq_to_vector(machine_gsi));
- }
+ if ( (ent == NULL) || !ent->fields.mask )
+ pirq_guest_eoi(d, machine_gsi);
}
void iommu_domain_destroy(struct domain *d)
diff -r bc4afcd4c612 -r e733e6b73d56 xen/arch/x86/hvm/vpic.c
--- a/xen/arch/x86/hvm/vpic.c Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/arch/x86/hvm/vpic.c Fri Oct 19 11:26:58 2007 +0100
@@ -252,7 +252,8 @@ static void vpic_ioport_write(
if ( vtd_enabled )
{
irq |= ((addr & 0xa0) == 0xa0) ? 8 : 0;
- hvm_dpci_eoi(hvm_isa_irq_to_gsi(irq), NULL);
+ hvm_dpci_eoi(current->domain,
+ hvm_isa_irq_to_gsi(irq), NULL);
}
break;
case 6: /* Set Priority */
diff -r bc4afcd4c612 -r e733e6b73d56 xen/include/asm-x86/hvm/io.h
--- a/xen/include/asm-x86/hvm/io.h Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/include/asm-x86/hvm/io.h Fri Oct 19 11:26:58 2007 +0100
@@ -151,7 +151,8 @@ extern void handle_mmio(unsigned long gp
extern void handle_mmio(unsigned long gpa);
extern void hvm_interrupt_post(struct vcpu *v, int vector, int type);
extern void hvm_io_assist(void);
-extern void hvm_dpci_eoi(unsigned int guest_irq, union vioapic_redir_entry
*ent);
+extern void hvm_dpci_eoi(struct domain *d, unsigned int guest_irq,
+ union vioapic_redir_entry *ent);
#endif /* __ASM_X86_HVM_IO_H__ */
diff -r bc4afcd4c612 -r e733e6b73d56 xen/include/asm-x86/hvm/irq.h
--- a/xen/include/asm-x86/hvm/irq.h Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/include/asm-x86/hvm/irq.h Fri Oct 19 11:26:58 2007 +0100
@@ -33,6 +33,7 @@ struct hvm_irq_dpci_mapping {
uint8_t valid;
uint8_t device;
uint8_t intx;
+ struct domain *dom;
union {
uint8_t guest_gsi;
uint8_t machine_gsi;
@@ -45,6 +46,7 @@ struct hvm_irq_dpci {
/* Guest IRQ to guest device/intx mapping. */
struct hvm_irq_dpci_mapping girq[NR_IRQS];
DECLARE_BITMAP(dirq_mask, NR_IRQS);
+ struct timer hvm_timer[NR_IRQS];
};
struct hvm_irq {
diff -r bc4afcd4c612 -r e733e6b73d56 xen/include/asm-x86/iommu.h
--- a/xen/include/asm-x86/iommu.h Fri Oct 19 09:31:03 2007 +0100
+++ b/xen/include/asm-x86/iommu.h Fri Oct 19 11:26:58 2007 +0100
@@ -79,7 +79,8 @@ int hvm_do_IRQ_dpci(struct domain *d, un
int hvm_do_IRQ_dpci(struct domain *d, unsigned int irq);
int dpci_ioport_intercept(ioreq_t *p);
int pt_irq_create_bind_vtd(struct domain *d,
- xen_domctl_bind_pt_irq_t * pt_irq_bind);
+ xen_domctl_bind_pt_irq_t *pt_irq_bind);
+#define PT_IRQ_TIME_OUT MILLISECS(8)
-#endif // _IOMMU_H_
+#endif /* _IOMMU_H_ */
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