[Xen-devel] [PATCH V3 22/29] x86/vioapic: extend vioapic_get_vector() to support remapping format RTE

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

When IOAPIC RTE is in remapping format, it doesn't contain the vector of
interrupt. For this case, the RTE contains an index of interrupt remapping
table where the vector of interrupt is stored. This patchs gets the vector
through a vIOMMU interface.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/arch/x86/hvm/vioapic.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vioapic.c b/xen/arch/x86/hvm/vioapic.c
index 5d0d1cd..9e47ef4 100644
--- a/xen/arch/x86/hvm/vioapic.c
+++ b/xen/arch/x86/hvm/vioapic.c
@@ -561,11 +561,25 @@ int vioapic_get_vector(const struct domain *d, unsigned 
int gsi)
 {
     unsigned int pin;
     const struct hvm_vioapic *vioapic = gsi_vioapic(d, gsi, &pin);
+    struct arch_irq_remapping_request request;
 
     if ( !vioapic )
         return -EINVAL;
 
-    return vioapic->redirtbl[pin].fields.vector;
+    irq_request_ioapic_fill(&request, vioapic->id, 
vioapic->redirtbl[pin].bits);
+    if ( viommu_check_irq_remapping(vioapic->domain, &request) )
+    {
+        int err;
+        struct arch_irq_remapping_info info;
+
+        err = viommu_get_irq_info(vioapic->domain, &request, &info);
+        return !err ? info.vector : err;
+    }
+    else
+    {
+        return vioapic->redirtbl[pin].fields.vector;
+    }
+
 }
 
 int vioapic_get_trigger_mode(const struct domain *d, unsigned int gsi)
-- 
1.8.3.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel