vmw_pvscsi: use PCI DMA APIs

It is wrong to use address_space_memory directly, because there could be an
IOMMU in the middle.  Passing the entire PVSCSIRingInfo to RS_GET_FIELD
and RS_SET_FIELD makes it easy to go back to the PVSCSIState.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/scsi/vmw_pvscsi.c

@@ -42,12 +42,12 @@
 #define PVSCSI_MAX_CMD_DATA_WORDS \
     (sizeof(PVSCSICmdDescSetupRings)/sizeof(uint32_t))
 
-#define RS_GET_FIELD(rs_pa, field) \
-    (ldl_le_phys(&address_space_memory, \
-                 rs_pa + offsetof(struct PVSCSIRingsState, field)))
-#define RS_SET_FIELD(rs_pa, field, val) \
-    (stl_le_phys(&address_space_memory, \
-                 rs_pa + offsetof(struct PVSCSIRingsState, field), val))
+#define RS_GET_FIELD(m, field) \
+    (ldl_le_pci_dma(&container_of(m, PVSCSIState, rings)->parent_obj, \
+                 (m)->rs_pa + offsetof(struct PVSCSIRingsState, field)))
+#define RS_SET_FIELD(m, field, val) \
+    (stl_le_pci_dma(&container_of(m, PVSCSIState, rings)->parent_obj, \
+                 (m)->rs_pa + offsetof(struct PVSCSIRingsState, field), val))
 
 #define TYPE_PVSCSI "pvscsi"
 #define PVSCSI(obj) OBJECT_CHECK(PVSCSIState, (obj), TYPE_PVSCSI)
@@ -153,13 +153,13 @@ pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
         m->cmp_ring_pages_pa[i] = ri->cmpRingPPNs[i] << VMW_PAGE_SHIFT;
     }
 
-    RS_SET_FIELD(m->rs_pa, reqProdIdx, 0);
-    RS_SET_FIELD(m->rs_pa, reqConsIdx, 0);
-    RS_SET_FIELD(m->rs_pa, reqNumEntriesLog2, txr_len_log2);
+    RS_SET_FIELD(m, reqProdIdx, 0);
+    RS_SET_FIELD(m, reqConsIdx, 0);
+    RS_SET_FIELD(m, reqNumEntriesLog2, txr_len_log2);
 
-    RS_SET_FIELD(m->rs_pa, cmpProdIdx, 0);
-    RS_SET_FIELD(m->rs_pa, cmpConsIdx, 0);
-    RS_SET_FIELD(m->rs_pa, cmpNumEntriesLog2, rxr_len_log2);
+    RS_SET_FIELD(m, cmpProdIdx, 0);
+    RS_SET_FIELD(m, cmpConsIdx, 0);
+    RS_SET_FIELD(m, cmpNumEntriesLog2, rxr_len_log2);
 
     trace_pvscsi_ring_init_data(txr_len_log2, rxr_len_log2);
 
@@ -185,9 +185,9 @@ pvscsi_ring_init_msg(PVSCSIRingInfo *m, PVSCSICmdDescSetupMsgRing *ri)
         m->msg_ring_pages_pa[i] = ri->ringPPNs[i] << VMW_PAGE_SHIFT;
     }
 
-    RS_SET_FIELD(m->rs_pa, msgProdIdx, 0);
-    RS_SET_FIELD(m->rs_pa, msgConsIdx, 0);
-    RS_SET_FIELD(m->rs_pa, msgNumEntriesLog2, len_log2);
+    RS_SET_FIELD(m, msgProdIdx, 0);
+    RS_SET_FIELD(m, msgConsIdx, 0);
+    RS_SET_FIELD(m, msgNumEntriesLog2, len_log2);
 
     trace_pvscsi_ring_init_msg(len_log2);
 
@@ -213,7 +213,7 @@ pvscsi_ring_cleanup(PVSCSIRingInfo *mgr)
 static hwaddr
 pvscsi_ring_pop_req_descr(PVSCSIRingInfo *mgr)
 {
-    uint32_t ready_ptr = RS_GET_FIELD(mgr->rs_pa, reqProdIdx);
+    uint32_t ready_ptr = RS_GET_FIELD(mgr, reqProdIdx);
 
     if (ready_ptr != mgr->consumed_ptr) {
         uint32_t next_ready_ptr =
@@ -233,7 +233,7 @@ pvscsi_ring_pop_req_descr(PVSCSIRingInfo *mgr)
 static void
 pvscsi_ring_flush_req(PVSCSIRingInfo *mgr)
 {
-    RS_SET_FIELD(mgr->rs_pa, reqConsIdx, mgr->consumed_ptr);
+    RS_SET_FIELD(mgr, reqConsIdx, mgr->consumed_ptr);
 }
 
 static hwaddr
@@ -278,14 +278,14 @@ pvscsi_ring_flush_cmp(PVSCSIRingInfo *mgr)
 
     trace_pvscsi_ring_flush_cmp(mgr->filled_cmp_ptr);
 
-    RS_SET_FIELD(mgr->rs_pa, cmpProdIdx, mgr->filled_cmp_ptr);
+    RS_SET_FIELD(mgr, cmpProdIdx, mgr->filled_cmp_ptr);
 }
 
 static bool
 pvscsi_ring_msg_has_room(PVSCSIRingInfo *mgr)
 {
-    uint32_t prodIdx = RS_GET_FIELD(mgr->rs_pa, msgProdIdx);
-    uint32_t consIdx = RS_GET_FIELD(mgr->rs_pa, msgConsIdx);
+    uint32_t prodIdx = RS_GET_FIELD(mgr, msgProdIdx);
+    uint32_t consIdx = RS_GET_FIELD(mgr, msgConsIdx);
 
     return (prodIdx - consIdx) < (mgr->msg_len_mask + 1);
 }
@@ -298,7 +298,7 @@ pvscsi_ring_flush_msg(PVSCSIRingInfo *mgr)
 
     trace_pvscsi_ring_flush_msg(mgr->filled_msg_ptr);
 
-    RS_SET_FIELD(mgr->rs_pa, msgProdIdx, mgr->filled_msg_ptr);
+    RS_SET_FIELD(mgr, msgProdIdx, mgr->filled_msg_ptr);
 }
 
 static void