[Xen-devel] [RFC PATCH V2 15/26] x86/vvtd: decode interrupt attribute from IRTE

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

Previously, interrupt attributes can be extracted from msi message or
IOAPIC RTE. However, with interrupt remapping enabled, the attributes
are enclosed in the associated IRTE. This callback is for cases in
which the caller wants to acquire interrupt attributes.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/arch/x86/hvm/vvtd.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vvtd.c b/xen/arch/x86/hvm/vvtd.c
index c993a15..57932cb 100644
--- a/xen/arch/x86/hvm/vvtd.c
+++ b/xen/arch/x86/hvm/vvtd.c
@@ -545,6 +545,25 @@ static int vvtd_handle_irq_request(struct domain *d,
     return -EFAULT;
 }
 
+static int vvtd_get_irq_info(struct domain *d,
+                             struct irq_remapping_request *irq,
+                             struct irq_remapping_info *info)
+{
+    int ret;
+    struct iremap_entry irte;
+    struct vvtd *vvtd = domain_vvtd(d);
+
+    ret = vvtd_get_entry(vvtd, irq, &irte, false);
+    if ( ret )
+        return -ret;
+
+    info->vector = irte.remap.vector;
+    info->dest = irte_dest(vvtd, irte.remap.dst);
+    info->dest_mode = irte.remap.dm;
+    info->delivery_mode = irte.remap.dlm;
+    return 0;
+}
+
 static void vvtd_reset(struct vvtd *vvtd, uint64_t capability)
 {
     uint64_t cap, ecap;
@@ -639,7 +658,8 @@ struct viommu_ops vvtd_hvm_vmx_ops = {
     .query_caps = vvtd_query_caps,
     .create = vvtd_create,
     .destroy = vvtd_destroy,
-    .handle_irq_request = vvtd_handle_irq_request
+    .handle_irq_request = vvtd_handle_irq_request,
+    .get_irq_info = vvtd_get_irq_info
 };
 
 static int vvtd_register(void)
-- 
1.8.3.1


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