[Xen-devel] [RFC PATCH 18/23] x86/vpt: Get interrupt vector through a vioapic interface

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

When irq remapping enabled, IRE may not contain the vector of interrupt. So, a
new function, vioapic_gsi_vector() is added to translate gsi to vector.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/arch/x86/hvm/vioapic.c        | 26 ++++++++++++++++++++++++++
 xen/arch/x86/hvm/vpt.c            |  2 +-
 xen/include/asm-x86/hvm/vioapic.h |  1 +
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
index 6a00644..95a2e15 100644
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -276,6 +276,32 @@ static inline int pit_channel0_enabled(void)
     return pt_active(&current->domain->arch.vpit.pt0);
 }
 
+int vioapic_gsi_vector(struct domain *d, unsigned int gsi)
+{
+    int err;
+    struct irq_remapping_request request;
+    struct hvm_hw_vioapic *vioapic = domain_vioapic(d);
+    struct irq_remapping_info info;
+
+    if ( vioapic->redirtbl[gsi].ir.format )
+    {
+        irq_request_ioapic_fill(&request, vioapic->id,
+                                vioapic->redirtbl[gsi].bits);
+        err = viommu_get_irq_info(d, &request, &info);
+        if ( err < 0 )
+        {
+            gdprintk(XENLOG_ERR, "Bad gsi or bad interrupt remapping table "
+                     "entry.\n");
+            domain_crash(d);
+        }
+        return info.vector;
+    }
+    else
+    {
+        return vioapic->redirtbl[gsi].fields.vector;
+    }
+}
+
 static void vioapic_deliver(struct hvm_hw_vioapic *vioapic, int irq)
 {
     uint16_t dest = vioapic->redirtbl[irq].fields.dest_id;
diff --git a/xen/arch/x86/hvm/vpt.c b/xen/arch/x86/hvm/vpt.c
index 5c48fdb..a1fafe2 100644
--- a/xen/arch/x86/hvm/vpt.c
+++ b/xen/arch/x86/hvm/vpt.c
@@ -91,7 +91,7 @@ static int pt_irq_vector(struct periodic_time *pt, enum 
hvm_intsrc src)
                 + (isa_irq & 7));
 
     ASSERT(src == hvm_intsrc_lapic);
-    return domain_vioapic(v->domain)->redirtbl[gsi].fields.vector;
+    return vioapic_gsi_vector(v->domain, gsi);
 }
 
 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 745c09a..fc3dc22 100644
--- a/xen/include/asm-x86/hvm/vioapic.h
+++ b/xen/include/asm-x86/hvm/vioapic.h
@@ -56,6 +56,7 @@ struct hvm_vioapic {
 #define vioapic_domain(v) (container_of((v), struct hvm_vioapic, \
                                         hvm_hw_vioapic)->domain)
 
+int vioapic_gsi_vector(struct domain *d, unsigned int gsi);
 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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