dma: do not depend on kvm_enabled()

Memory barriers are needed also by Xen and, when the ioeventfd
bugs are fixed, by TCG as well.

sysemu/kvm.h is not anymore needed in sysemu/dma.h, move it to
the actual users.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/intc/arm_gicv2m.c

@@ -29,6 +29,7 @@
 #include "qapi/error.h"
 #include "hw/sysbus.h"
 #include "hw/pci/msi.h"
+#include "sysemu/kvm.h"
 
 #define TYPE_ARM_GICV2M "arm-gicv2m"
 #define ARM_GICV2M(obj) OBJECT_CHECK(ARMGICv2mState, (obj), TYPE_ARM_GICV2M)

hw/intc/xics_kvm.c

@@ -31,7 +31,7 @@
 #include "cpu.h"
 #include "hw/hw.h"
 #include "trace.h"
-#include "linux/kvm.h"
+#include "sysemu/kvm.h"
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/xics.h"
 #include "kvm_ppc.h"

hw/misc/pci-testdev.c

@@ -21,6 +21,7 @@
 #include "hw/hw.h"
 #include "hw/pci/pci.h"
 #include "qemu/event_notifier.h"
+#include "sysemu/kvm.h"
 
 typedef struct PCITestDevHdr {
     uint8_t test;

hw/ppc/e500plat.c

@@ -14,6 +14,7 @@
 #include "e500.h"
 #include "hw/boards.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/kvm.h"
 #include "hw/pci/pci.h"
 #include "hw/ppc/openpic.h"
 #include "kvm_ppc.h"

hw/ppc/spapr_hcall.c

@@ -7,6 +7,7 @@
 #include "mmu-hash64.h"
 #include "cpu-models.h"
 #include "trace.h"
+#include "sysemu/kvm.h"
 #include "kvm_ppc.h"
 
 struct SPRSyncState {

hw/ppc/spapr_pci.c

@@ -44,6 +44,7 @@
 #include "hw/pci/pci_bus.h"
 #include "hw/ppc/spapr_drc.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/kvm.h"
 
 #include "hw/vfio/vfio.h"
 

hw/ppc/spapr_rtas.c

@@ -31,6 +31,7 @@
 #include "hw/qdev.h"
 #include "sysemu/device_tree.h"
 #include "sysemu/cpus.h"
+#include "sysemu/kvm.h"
 
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/spapr_vio.h"

include/sysemu/dma.h

@@ -15,7 +15,6 @@
 #include "hw/hw.h"
 #include "block/block.h"
 #include "block/accounting.h"
-#include "sysemu/kvm.h"
 
 typedef struct ScatterGatherEntry ScatterGatherEntry;
 
@@ -67,9 +66,7 @@ static inline void dma_barrier(AddressSpace *as, DMADirection dir)
      * use lighter barriers based on the direction of the
      * transfer, the DMA context, etc...
      */
-    if (kvm_enabled()) {
-        smp_mb();
-    }
+    smp_mb();
 }
 
 /* Checks that the given range of addresses is valid for DMA.  This is