[RFC PATCH V2 19/26] x86/vpt: Get interrupt vector through a vioapic interface

[Lan Tianyu <tianyu.lan@intel.com>]

From: Chao Gao <chao.gao@intel.com>

When IOAPIC RTE is in remapping format, it doesn't contain the vector of
interrupt. This patch adds vioapic_gsi_vector() to translate pin to vector.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
 xen/arch/x86/hvm/vioapic.c        | 27 +++++++++++++++++++++++++++
 xen/arch/x86/hvm/vpt.c            |  2 +-
 xen/include/asm-x86/hvm/vioapic.h |  1 +
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
index 40f529c..e7d1de7 100644
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -319,6 +319,33 @@ static inline int pit_channel0_enabled(void)
     return pt_active(&current->domain->arch.vpit.pt0);
 }
 
+int vioapic_pin_vector(struct hvm_vioapic *vioapic, unsigned int pin)
+{
+    struct IO_APIC_route_remap_entry rte = { { vioapic->redirtbl[pin].bits } };
+
+    if ( rte.format )
+    {
+        int err;
+        struct irq_remapping_request request;
+        struct irq_remapping_info info;
+
+        irq_request_ioapic_fill(&request, vioapic->id, rte.val);
+        /* Currently, only viommu 0 is supported */
+        err = viommu_get_irq_info(vioapic->domain, 0, &request, &info);
+        if ( err < 0 )
+        {
+            gdprintk(XENLOG_ERR, "Bad gsi or bad interrupt remapping table "
+                     "entry.\n");
+            domain_crash(vioapic->domain);
+        }
+        return info.vector;
+    }
+    else
+    {
+        return vioapic->redirtbl[pin].fields.vector;
+    }
+}
+
 static void vioapic_deliver(struct hvm_vioapic *vioapic, unsigned int pin)
 {
     uint16_t dest = vioapic->redirtbl[pin].fields.dest_id;
diff --git a/xen/arch/x86/hvm/vpt.c b/xen/arch/x86/hvm/vpt.c
index e3f2039..b95d3a1 100644
--- a/xen/arch/x86/hvm/vpt.c
+++ b/xen/arch/x86/hvm/vpt.c
@@ -101,7 +101,7 @@ static int pt_irq_vector(struct periodic_time *pt, enum hvm_intsrc src)
         return -1;
     }
 
-    return vioapic->redirtbl[pin].fields.vector;
+    return vioapic_pin_vector(vioapic, pin);
 }
 
 static int pt_irq_masked(struct periodic_time *pt)
diff --git a/xen/include/asm-x86/hvm/vioapic.h b/xen/include/asm-x86/hvm/vioapic.h
index 2ceb60e..bc2725b 100644
--- a/xen/include/asm-x86/hvm/vioapic.h
+++ b/xen/include/asm-x86/hvm/vioapic.h
@@ -64,6 +64,7 @@ struct hvm_vioapic {
 struct hvm_vioapic *gsi_vioapic(const struct domain *d, unsigned int gsi,
                                 unsigned int *pin);
 
+int vioapic_pin_vector(struct hvm_vioapic *vioapic, unsigned int pin);
 int vioapic_init(struct domain *d);
 void vioapic_deinit(struct domain *d);
 void vioapic_reset(struct domain *d);
-- 
1.8.3.1


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