[Xen-devel] [PATCH V3 17/29] x86/vvtd: add a helper function to decide the interrupt format

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

From: Chao Gao <chao.gao@xxxxxxxxx>

Different platform may use different method to distinguish
remapping format interrupt and normal format interrupt.

Intel uses one bit in IOAPIC RTE or MSI address register to
indicate the interrupt is remapping format. vvtd will handle
all the interrupts when .check_irq_remapping() return true.

Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/vvtd.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/vtd/vvtd.c 
b/xen/drivers/passthrough/vtd/vvtd.c
index 5e22ace..bd1cadd 100644
--- a/xen/drivers/passthrough/vtd/vvtd.c
+++ b/xen/drivers/passthrough/vtd/vvtd.c
@@ -536,6 +536,28 @@ static int vvtd_get_irq_info(struct domain *d,
     return 0;
 }
 
+/* Probe whether the interrupt request is an remapping format */
+static bool vvtd_is_remapping(struct domain *d,
+                              struct arch_irq_remapping_request *irq)
+{
+    if ( irq->type == VIOMMU_REQUEST_IRQ_APIC )
+    {
+        struct IO_APIC_route_remap_entry rte = { .val = irq->msg.rte };
+
+        return rte.format;
+    }
+    else if ( irq->type == VIOMMU_REQUEST_IRQ_MSI )
+    {
+        struct msi_msg_remap_entry msi_msg =
+        { .address_lo = { .val = irq->msg.msi.addr } };
+
+        return msi_msg.address_lo.format;
+    }
+    ASSERT_UNREACHABLE();
+
+    return 0;
+}
+
 static void vvtd_reset(struct vvtd *vvtd, uint64_t capability)
 {
     uint64_t cap = cap_set_num_fault_regs(1ULL) |
@@ -607,7 +629,8 @@ struct viommu_ops vvtd_hvm_vmx_ops = {
     .create = vvtd_create,
     .destroy = vvtd_destroy,
     .handle_irq_request = vvtd_handle_irq_request,
-    .get_irq_info = vvtd_get_irq_info
+    .get_irq_info = vvtd_get_irq_info,
+    .check_irq_remapping = vvtd_is_remapping
 };
 
 static int vvtd_register(void)
-- 
1.8.3.1


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