KVM: MSI: Swap payload to native endianness

The usual MSI injection mechanism writes msi.data into memory using an
le32 wrapper. So on big endian guests, this swaps msg.data into the
expected byte order.

For irqfd however, we don't swap the payload right now, rendering
in-kernel MPIC emulation broken on PowerPC.

Swap msg.data to the correct endianness whenever we touch it.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/kvm-all.c b/kvm-all.c
index a5ab2a3f8eba476258d84500ccdaa9f62b56ff81..76435f5759b8034d8a818057887d6be54ef4f664 100644 (file)
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1131,7 +1131,7 @@ static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
     QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
         if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
             route->kroute.u.msi.address_hi == (msg.address >> 32) &&
-            route->kroute.u.msi.data == msg.data) {
+            route->kroute.u.msi.data == le32_to_cpu(msg.data)) {
             return route;
         }
     }
@@ -1146,7 +1146,7 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
     if (s->direct_msi) {
         msi.address_lo = (uint32_t)msg.address;
         msi.address_hi = msg.address >> 32;
-        msi.data = msg.data;
+        msi.data = le32_to_cpu(msg.data);
         msi.flags = 0;
         memset(msi.pad, 0, sizeof(msi.pad));
 
@@ -1168,7 +1168,7 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
         route->kroute.flags = 0;
         route->kroute.u.msi.address_lo = (uint32_t)msg.address;
         route->kroute.u.msi.address_hi = msg.address >> 32;
-        route->kroute.u.msi.data = msg.data;
+        route->kroute.u.msi.data = le32_to_cpu(msg.data);
 
         kvm_add_routing_entry(s, &route->kroute);
 
@@ -1200,7 +1200,7 @@ int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
     kroute.flags = 0;
     kroute.u.msi.address_lo = (uint32_t)msg.address;
     kroute.u.msi.address_hi = msg.address >> 32;
-    kroute.u.msi.data = msg.data;
+    kroute.u.msi.data = le32_to_cpu(msg.data);
 
     kvm_add_routing_entry(s, &kroute);
 
@@ -1220,7 +1220,7 @@ int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
     kroute.flags = 0;
     kroute.u.msi.address_lo = (uint32_t)msg.address;
     kroute.u.msi.address_hi = msg.address >> 32;
-    kroute.u.msi.data = msg.data;
+    kroute.u.msi.data = le32_to_cpu(msg.data);
 
     return kvm_update_routing_entry(s, &kroute);
 }