[Xen-devel] [PATCH V3 16/29] x86/vvtd: decode interrupt attribute from IRTE

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

Without interrupt remapping, 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, for
example:
1. vioapic_get_vector(). With vIOMMU, the RTE may don't contain vector.
2. perform EOI which is always based on the interrupt vector.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
v3:
 - add example cases in which we will use this function.
---
 xen/drivers/passthrough/vtd/vvtd.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/vtd/vvtd.c 
b/xen/drivers/passthrough/vtd/vvtd.c
index 90c00f5..5e22ace 100644
--- a/xen/drivers/passthrough/vtd/vvtd.c
+++ b/xen/drivers/passthrough/vtd/vvtd.c
@@ -516,6 +516,26 @@ static int vvtd_handle_irq_request(struct domain *d,
                          irte.remap.tm);
 }
 
+static int vvtd_get_irq_info(struct domain *d,
+                             struct arch_irq_remapping_request *irq,
+                             struct arch_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 = cap_set_num_fault_regs(1ULL) |
@@ -586,7 +606,8 @@ static int vvtd_destroy(struct viommu *viommu)
 struct viommu_ops vvtd_hvm_vmx_ops = {
     .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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