scsi: VMWare PVSCSI paravirtual device implementation

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Signed-off-by: Yan Vugenfirer <yan@daynix.com>
[ Rename files to vmw_pvscsi, fix setting of hostStatus in
  pvscsi_request_cancelled - Paolo ]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 1651 insertions, 0 deletions

diff --git a/hw/scsi/Makefile.objs b/hw/scsi/Makefile.objs
index aab0e9b494..eaec6c87ef 100644
--- a/hw/scsi/Makefile.objs
+++ b/hw/scsi/Makefile.objs
@@ -2,6 +2,7 @@ common-obj-y += scsi-disk.o
 common-obj-y += scsi-generic.o scsi-bus.o
 common-obj-$(CONFIG_LSI_SCSI_PCI) += lsi53c895a.o
 common-obj-$(CONFIG_MEGASAS_SCSI_PCI) += megasas.o
+common-obj-$(CONFIG_VMW_PVSCSI_SCSI_PCI) += vmw_pvscsi.o
 common-obj-$(CONFIG_ESP) += esp.o
 common-obj-$(CONFIG_ESP_PCI) += esp-pci.o
 obj-$(CONFIG_PSERIES) += spapr_vscsi.o
diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c
new file mode 100644
index 0000000000..4b4a58fd38
--- /dev/null
+++ b/hw/scsi/vmw_pvscsi.c
@@ -0,0 +1,1216 @@
+/*
+ * QEMU VMWARE PVSCSI paravirtual SCSI bus
+ *
+ * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
+ *
+ * Developed by Daynix Computing LTD (http://www.daynix.com)
+ *
+ * Based on implementation by Paolo Bonzini
+ * http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg00729.html
+ *
+ * Authors:
+ * Paolo Bonzini <pbonzini@redhat.com>
+ * Dmitry Fleytman <dmitry@daynix.com>
+ * Yan Vugenfirer <yan@daynix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ *
+ * NOTE about MSI-X:
+ * MSI-X support has been removed for the moment because it leads Windows OS
+ * to crash on startup. The crash happens because Windows driver requires
+ * MSI-X shared memory to be part of the same BAR used for rings state
+ * registers, etc. This is not supported by QEMU infrastructure so separate
+ * BAR created from MSI-X purposes. Windows driver fails to deal with 2 BARs.
+ *
+ */
+
+#include "hw/scsi/scsi.h"
+#include <block/scsi.h>
+#include "hw/pci/msi.h"
+#include "vmw_pvscsi.h"
+#include "trace.h"
+
+
+#define PVSCSI_MSI_OFFSET        (0x50)
+#define PVSCSI_USE_64BIT         (true)
+#define PVSCSI_PER_VECTOR_MASK   (false)
+
+#define PVSCSI_MAX_DEVS                   (64)
+#define PVSCSI_MSIX_NUM_VECTORS           (1)
+
+#define PVSCSI_MAX_CMD_DATA_WORDS \
+    (sizeof(PVSCSICmdDescSetupRings)/sizeof(uint32_t))
+
+#define RS_GET_FIELD(rs_pa, field) \
+    (ldl_le_phys(rs_pa + offsetof(struct PVSCSIRingsState, field)))
+#define RS_SET_FIELD(rs_pa, field, val) \
+    (stl_le_phys(rs_pa + offsetof(struct PVSCSIRingsState, field), val))
+
+#define TYPE_PVSCSI "pvscsi"
+#define PVSCSI(obj) OBJECT_CHECK(PVSCSIState, (obj), TYPE_PVSCSI)
+
+typedef struct PVSCSIRingInfo {
+    uint64_t            rs_pa;
+    uint32_t            txr_len_mask;
+    uint32_t            rxr_len_mask;
+    uint32_t            msg_len_mask;
+    uint64_t            req_ring_pages_pa[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
+    uint64_t            cmp_ring_pages_pa[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
+    uint64_t            msg_ring_pages_pa[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
+    uint64_t            consumed_ptr;
+    uint64_t            filled_cmp_ptr;
+    uint64_t            filled_msg_ptr;
+} PVSCSIRingInfo;
+
+typedef struct PVSCSISGState {
+    hwaddr elemAddr;
+    hwaddr dataAddr;
+    uint32_t resid;
+} PVSCSISGState;
+
+typedef QTAILQ_HEAD(, PVSCSIRequest) PVSCSIRequestList;
+
+typedef struct {
+    PCIDevice parent_obj;
+    MemoryRegion io_space;
+    SCSIBus bus;
+    QEMUBH *completion_worker;
+    PVSCSIRequestList pending_queue;
+    PVSCSIRequestList completion_queue;
+
+    uint64_t reg_interrupt_status;        /* Interrupt status register value */
+    uint64_t reg_interrupt_enabled;       /* Interrupt mask register value   */
+    uint64_t reg_command_status;          /* Command status register value   */
+
+    /* Command data adoption mechanism */
+    uint64_t curr_cmd;                   /* Last command arrived             */
+    uint32_t curr_cmd_data_cntr;         /* Amount of data for last command  */
+
+    /* Collector for current command data */
+    uint32_t curr_cmd_data[PVSCSI_MAX_CMD_DATA_WORDS];
+
+    uint8_t rings_info_valid;            /* Whether data rings initialized   */
+    uint8_t msg_ring_info_valid;         /* Whether message ring initialized */
+    uint8_t use_msg;                     /* Whether to use message ring      */
+
+    uint8_t msi_used;    /* Whether MSI support was installed successfully   */
+
+    PVSCSIRingInfo rings;                /* Data transfer rings manager      */
+    uint32_t resetting;                  /* Reset in progress                */
+} PVSCSIState;
+
+typedef struct PVSCSIRequest {
+    SCSIRequest *sreq;
+    PVSCSIState *dev;
+    uint8_t sense_key;
+    uint8_t completed;
+    int lun;
+    QEMUSGList sgl;
+    PVSCSISGState sg;
+    struct PVSCSIRingReqDesc req;
+    struct PVSCSIRingCmpDesc cmp;
+    QTAILQ_ENTRY(PVSCSIRequest) next;
+} PVSCSIRequest;
+
+/* Integer binary logarithm */
+static int
+pvscsi_log2(uint32_t input)
+{
+    int log = 0;
+    assert(input > 0);
+    while (input >> ++log) {
+    }
+    return log;
+}
+
+static void
+pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
+{
+    int i;
+    uint32_t txr_len_log2, rxr_len_log2;
+    uint32_t req_ring_size, cmp_ring_size;
+    m->rs_pa = ri->ringsStatePPN << VMW_PAGE_SHIFT;
+
+    req_ring_size = ri->reqRingNumPages * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
+    cmp_ring_size = ri->cmpRingNumPages * PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
+    txr_len_log2 = pvscsi_log2(req_ring_size - 1);
+    rxr_len_log2 = pvscsi_log2(cmp_ring_size - 1);
+
+    m->txr_len_mask = MASK(txr_len_log2);
+    m->rxr_len_mask = MASK(rxr_len_log2);
+
+    m->consumed_ptr = 0;
+    m->filled_cmp_ptr = 0;
+
+    for (i = 0; i < ri->reqRingNumPages; i++) {
+        m->req_ring_pages_pa[i] = ri->reqRingPPNs[i] << VMW_PAGE_SHIFT;
+    }
+
+    for (i = 0; i < ri->cmpRingNumPages; i++) {
+        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->rs_pa, cmpProdIdx, 0);
+    RS_SET_FIELD(m->rs_pa, cmpConsIdx, 0);
+    RS_SET_FIELD(m->rs_pa, cmpNumEntriesLog2, rxr_len_log2);
+
+    trace_pvscsi_ring_init_data(txr_len_log2, rxr_len_log2);
+
+    /* Flush ring state page changes */
+    smp_wmb();
+}
+
+static void
+pvscsi_ring_init_msg(PVSCSIRingInfo *m, PVSCSICmdDescSetupMsgRing *ri)
+{
+    int i;
+    uint32_t len_log2;
+    uint32_t ring_size;
+
+    ring_size = ri->numPages * PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
+    len_log2 = pvscsi_log2(ring_size - 1);
+
+    m->msg_len_mask = MASK(len_log2);
+
+    m->filled_msg_ptr = 0;
+
+    for (i = 0; i < ri->numPages; i++) {
+        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);
+
+    trace_pvscsi_ring_init_msg(len_log2);
+
+    /* Flush ring state page changes */
+    smp_wmb();
+}
+
+static void
+pvscsi_ring_cleanup(PVSCSIRingInfo *mgr)
+{
+    mgr->rs_pa = 0;
+    mgr->txr_len_mask = 0;
+    mgr->rxr_len_mask = 0;
+    mgr->msg_len_mask = 0;
+    mgr->consumed_ptr = 0;
+    mgr->filled_cmp_ptr = 0;
+    mgr->filled_msg_ptr = 0;
+    memset(mgr->req_ring_pages_pa, 0, sizeof(mgr->req_ring_pages_pa));
+    memset(mgr->cmp_ring_pages_pa, 0, sizeof(mgr->cmp_ring_pages_pa));
+    memset(mgr->msg_ring_pages_pa, 0, sizeof(mgr->msg_ring_pages_pa));
+}
+
+static hwaddr
+pvscsi_ring_pop_req_descr(PVSCSIRingInfo *mgr)
+{
+    uint32_t ready_ptr = RS_GET_FIELD(mgr->rs_pa, reqProdIdx);
+
+    if (ready_ptr != mgr->consumed_ptr) {
+        uint32_t next_ready_ptr =
+            mgr->consumed_ptr++ & mgr->txr_len_mask;
+        uint32_t next_ready_page =
+            next_ready_ptr / PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
+        uint32_t inpage_idx =
+            next_ready_ptr % PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
+
+        return mgr->req_ring_pages_pa[next_ready_page] +
+               inpage_idx * sizeof(PVSCSIRingReqDesc);
+    } else {
+        return 0;
+    }
+}
+
+static void
+pvscsi_ring_flush_req(PVSCSIRingInfo *mgr)
+{
+    RS_SET_FIELD(mgr->rs_pa, reqConsIdx, mgr->consumed_ptr);
+}
+
+static hwaddr
+pvscsi_ring_pop_cmp_descr(PVSCSIRingInfo *mgr)
+{
+    /*
+     * According to Linux driver code it explicitly verifies that number
+     * of requests being processed by device is less then the size of
+     * completion queue, so device may omit completion queue overflow
+     * conditions check. We assume that this is true for other (Windows)
+     * drivers as well.
+     */
+
+    uint32_t free_cmp_ptr =
+        mgr->filled_cmp_ptr++ & mgr->rxr_len_mask;
+    uint32_t free_cmp_page =
+        free_cmp_ptr / PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
+    uint32_t inpage_idx =
+        free_cmp_ptr % PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
+    return mgr->cmp_ring_pages_pa[free_cmp_page] +
+           inpage_idx * sizeof(PVSCSIRingCmpDesc);
+}
+
+static hwaddr
+pvscsi_ring_pop_msg_descr(PVSCSIRingInfo *mgr)
+{
+    uint32_t free_msg_ptr =
+        mgr->filled_msg_ptr++ & mgr->msg_len_mask;
+    uint32_t free_msg_page =
+        free_msg_ptr / PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
+    uint32_t inpage_idx =
+        free_msg_ptr % PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
+    return mgr->msg_ring_pages_pa[free_msg_page] +
+           inpage_idx * sizeof(PVSCSIRingMsgDesc);
+}
+
+static void
+pvscsi_ring_flush_cmp(PVSCSIRingInfo *mgr)
+{
+    /* Flush descriptor changes */
+    smp_wmb();
+
+    trace_pvscsi_ring_flush_cmp(mgr->filled_cmp_ptr);
+
+    RS_SET_FIELD(mgr->rs_pa, 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);
+
+    return (prodIdx - consIdx) < (mgr->msg_len_mask + 1);
+}
+
+static void
+pvscsi_ring_flush_msg(PVSCSIRingInfo *mgr)
+{
+    /* Flush descriptor changes */
+    smp_wmb();
+
+    trace_pvscsi_ring_flush_msg(mgr->filled_msg_ptr);
+
+    RS_SET_FIELD(mgr->rs_pa, msgProdIdx, mgr->filled_msg_ptr);
+}
+
+static void
+pvscsi_reset_state(PVSCSIState *s)
+{
+    s->curr_cmd = PVSCSI_CMD_FIRST;
+    s->curr_cmd_data_cntr = 0;
+    s->reg_command_status = PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+    s->reg_interrupt_status = 0;
+    pvscsi_ring_cleanup(&s->rings);
+    s->rings_info_valid = FALSE;
+    s->msg_ring_info_valid = FALSE;
+    QTAILQ_INIT(&s->pending_queue);
+    QTAILQ_INIT(&s->completion_queue);
+}
+
+static void
+pvscsi_update_irq_status(PVSCSIState *s)
+{
+    PCIDevice *d = PCI_DEVICE(s);
+    bool should_raise = s->reg_interrupt_enabled & s->reg_interrupt_status;
+
+    trace_pvscsi_update_irq_level(should_raise, s->reg_interrupt_enabled,
+                                  s->reg_interrupt_status);
+
+    if (s->msi_used && msi_enabled(d)) {
+        if (should_raise) {
+            trace_pvscsi_update_irq_msi();
+            msi_notify(d, PVSCSI_VECTOR_COMPLETION);
+        }
+        return;
+    }
+
+    qemu_set_irq(d->irq[0], !!should_raise);
+}
+
+static void
+pvscsi_raise_completion_interrupt(PVSCSIState *s)
+{
+    s->reg_interrupt_status |= PVSCSI_INTR_CMPL_0;
+
+    /* Memory barrier to flush interrupt status register changes*/
+    smp_wmb();
+
+    pvscsi_update_irq_status(s);
+}
+
+static void
+pvscsi_raise_message_interrupt(PVSCSIState *s)
+{
+    s->reg_interrupt_status |= PVSCSI_INTR_MSG_0;
+
+    /* Memory barrier to flush interrupt status register changes*/
+    smp_wmb();
+
+    pvscsi_update_irq_status(s);
+}
+
+static void
+pvscsi_cmp_ring_put(PVSCSIState *s, struct PVSCSIRingCmpDesc *cmp_desc)
+{
+    hwaddr cmp_descr_pa;
+
+    cmp_descr_pa = pvscsi_ring_pop_cmp_descr(&s->rings);
+    trace_pvscsi_cmp_ring_put(cmp_descr_pa);
+    cpu_physical_memory_write(cmp_descr_pa, (void *)cmp_desc,
+                              sizeof(*cmp_desc));
+}
+
+static void
+pvscsi_msg_ring_put(PVSCSIState *s, struct PVSCSIRingMsgDesc *msg_desc)
+{
+    hwaddr msg_descr_pa;
+
+    msg_descr_pa = pvscsi_ring_pop_msg_descr(&s->rings);
+    trace_pvscsi_msg_ring_put(msg_descr_pa);
+    cpu_physical_memory_write(msg_descr_pa, (void *)msg_desc,
+                              sizeof(*msg_desc));
+}
+
+static void
+pvscsi_process_completion_queue(void *opaque)
+{
+    PVSCSIState *s = opaque;
+    PVSCSIRequest *pvscsi_req;
+    bool has_completed = false;
+
+    while (!QTAILQ_EMPTY(&s->completion_queue)) {
+        pvscsi_req = QTAILQ_FIRST(&s->completion_queue);
+        QTAILQ_REMOVE(&s->completion_queue, pvscsi_req, next);
+        pvscsi_cmp_ring_put(s, &pvscsi_req->cmp);
+        g_free(pvscsi_req);
+        has_completed++;
+    }
+
+    if (has_completed) {
+        pvscsi_ring_flush_cmp(&s->rings);
+        pvscsi_raise_completion_interrupt(s);
+    }
+}
+
+static void
+pvscsi_reset_adapter(PVSCSIState *s)
+{
+    s->resetting++;
+    qbus_reset_all_fn(&s->bus);
+    s->resetting--;
+    pvscsi_process_completion_queue(s);
+    assert(QTAILQ_EMPTY(&s->pending_queue));
+    pvscsi_reset_state(s);
+}
+
+static void
+pvscsi_schedule_completion_processing(PVSCSIState *s)
+{
+    /* Try putting more complete requests on the ring. */
+    if (!QTAILQ_EMPTY(&s->completion_queue)) {
+        qemu_bh_schedule(s->completion_worker);
+    }
+}
+
+static void
+pvscsi_complete_request(PVSCSIState *s, PVSCSIRequest *r)
+{
+    assert(!r->completed);
+
+    trace_pvscsi_complete_request(r->cmp.context, r->cmp.dataLen,
+                                  r->sense_key);
+    if (r->sreq != NULL) {
+        scsi_req_unref(r->sreq);
+        r->sreq = NULL;
+    }
+    r->completed = 1;
+    QTAILQ_REMOVE(&s->pending_queue, r, next);
+    QTAILQ_INSERT_TAIL(&s->completion_queue, r, next);
+    pvscsi_schedule_completion_processing(s);
+}
+
+static QEMUSGList *pvscsi_get_sg_list(SCSIRequest *r)
+{
+    PVSCSIRequest *req = r->hba_private;
+
+    trace_pvscsi_get_sg_list(req->sgl.nsg, req->sgl.size);
+
+    return &req->sgl;
+}
+
+static void
+pvscsi_get_next_sg_elem(PVSCSISGState *sg)
+{
+    struct PVSCSISGElement elem;
+
+    cpu_physical_memory_read(sg->elemAddr, (void *)&elem, sizeof(elem));
+    if ((elem.flags & ~PVSCSI_KNOWN_FLAGS) != 0) {
+        /*
+            * There is PVSCSI_SGE_FLAG_CHAIN_ELEMENT flag described in
+            * header file but its value is unknown. This flag requires
+            * additional processing, so we put warning here to catch it
+            * some day and make proper implementation
+            */
+        trace_pvscsi_get_next_sg_elem(elem.flags);
+    }
+
+    sg->elemAddr += sizeof(elem);
+    sg->dataAddr = elem.addr;
+    sg->resid = elem.length;
+}
+
+static void
+pvscsi_write_sense(PVSCSIRequest *r, uint8_t *sense, int len)
+{
+    r->cmp.senseLen = MIN(r->req.senseLen, len);
+    r->sense_key = sense[(sense[0] & 2) ? 1 : 2];
+    cpu_physical_memory_write(r->req.senseAddr, sense, r->cmp.senseLen);
+}
+
+static void
+pvscsi_command_complete(SCSIRequest *req, uint32_t status, size_t resid)
+{
+    PVSCSIRequest *pvscsi_req = req->hba_private;
+    PVSCSIState *s = pvscsi_req->dev;
+
+    if (!pvscsi_req) {
+        trace_pvscsi_command_complete_not_found(req->tag);
+        return;
+    }
+
+    if (resid) {
+        /* Short transfer.  */
+        trace_pvscsi_command_complete_data_run();
+        pvscsi_req->cmp.hostStatus = BTSTAT_DATARUN;
+    }
+
+    pvscsi_req->cmp.scsiStatus = status;
+    if (pvscsi_req->cmp.scsiStatus == CHECK_CONDITION) {
+        uint8_t sense[SCSI_SENSE_BUF_SIZE];
+        int sense_len =
+            scsi_req_get_sense(pvscsi_req->sreq, sense, sizeof(sense));
+
+        trace_pvscsi_command_complete_sense_len(sense_len);
+        pvscsi_write_sense(pvscsi_req, sense, sense_len);
+    }
+    qemu_sglist_destroy(&pvscsi_req->sgl);
+    pvscsi_complete_request(s, pvscsi_req);
+}
+
+static void
+pvscsi_send_msg(PVSCSIState *s, SCSIDevice *dev, uint32_t msg_type)
+{
+    if (s->msg_ring_info_valid && pvscsi_ring_msg_has_room(&s->rings)) {
+        PVSCSIMsgDescDevStatusChanged msg = {0};
+
+        msg.type = msg_type;
+        msg.bus = dev->channel;
+        msg.target = dev->id;
+        msg.lun[1] = dev->lun;
+
+        pvscsi_msg_ring_put(s, (PVSCSIRingMsgDesc *)&msg);
+        pvscsi_ring_flush_msg(&s->rings);
+        pvscsi_raise_message_interrupt(s);
+    }
+}
+
+static void
+pvscsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
+{
+    PVSCSIState *s = container_of(bus, PVSCSIState, bus);
+    pvscsi_send_msg(s, dev, PVSCSI_MSG_DEV_ADDED);
+}
+
+static void
+pvscsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
+{
+    PVSCSIState *s = container_of(bus, PVSCSIState, bus);
+    pvscsi_send_msg(s, dev, PVSCSI_MSG_DEV_REMOVED);
+}
+
+static void
+pvscsi_request_cancelled(SCSIRequest *req)
+{
+    PVSCSIRequest *pvscsi_req = req->hba_private;
+    PVSCSIState *s = pvscsi_req->dev;
+
+    if (pvscsi_req->completed) {
+        return;
+    }
+
+   if (pvscsi_req->dev->resetting) {
+       pvscsi_req->cmp.hostStatus = BTSTAT_BUSRESET;
+    } else {
+       pvscsi_req->cmp.hostStatus = BTSTAT_ABORTQUEUE;
+    }
+
+    pvscsi_complete_request(s, pvscsi_req);
+}
+
+static SCSIDevice*
+pvscsi_device_find(PVSCSIState *s, int channel, int target,
+                   uint8_t *requested_lun, uint8_t *target_lun)
+{
+    if (requested_lun[0] || requested_lun[2] || requested_lun[3] ||
+        requested_lun[4] || requested_lun[5] || requested_lun[6] ||
+        requested_lun[7] || (target > PVSCSI_MAX_DEVS)) {
+        return NULL;
+    } else {
+        *target_lun = requested_lun[1];
+        return scsi_device_find(&s->bus, channel, target, *target_lun);
+    }
+}
+
+static PVSCSIRequest *
+pvscsi_queue_pending_descriptor(PVSCSIState *s, SCSIDevice **d,
+                                struct PVSCSIRingReqDesc *descr)
+{
+    PVSCSIRequest *pvscsi_req;
+    uint8_t lun;
+
+    pvscsi_req = g_malloc0(sizeof(*pvscsi_req));
+    pvscsi_req->dev = s;
+    pvscsi_req->req = *descr;
+    pvscsi_req->cmp.context = pvscsi_req->req.context;
+    QTAILQ_INSERT_TAIL(&s->pending_queue, pvscsi_req, next);
+
+    *d = pvscsi_device_find(s, descr->bus, descr->target, descr->lun, &lun);
+    if (*d) {
+        pvscsi_req->lun = lun;
+    }
+
+    return pvscsi_req;
+}
+
+static void
+pvscsi_convert_sglist(PVSCSIRequest *r)
+{
+    int chunk_size;
+    uint64_t data_length = r->req.dataLen;
+    PVSCSISGState sg = r->sg;
+    while (data_length) {
+        while (!sg.resid) {
+            pvscsi_get_next_sg_elem(&sg);
+            trace_pvscsi_convert_sglist(r->req.context, r->sg.dataAddr,
+                                        r->sg.resid);
+        }
+        assert(data_length > 0);
+        chunk_size = MIN((unsigned) data_length, sg.resid);
+        if (chunk_size) {
+            qemu_sglist_add(&r->sgl, sg.dataAddr, chunk_size);
+        }
+
+        sg.dataAddr += chunk_size;
+        data_length -= chunk_size;
+        sg.resid -= chunk_size;
+    }
+}
+
+static void
+pvscsi_build_sglist(PVSCSIState *s, PVSCSIRequest *r)
+{
+    PCIDevice *d = PCI_DEVICE(s);
+
+    qemu_sglist_init(&r->sgl, 1, pci_dma_context(d));
+    if (r->req.flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
+        pvscsi_convert_sglist(r);
+    } else {
+        qemu_sglist_add(&r->sgl, r->req.dataAddr, r->req.dataLen);
+    }
+}
+
+static void
+pvscsi_process_request_descriptor(PVSCSIState *s,
+                                  struct PVSCSIRingReqDesc *descr)
+{
+    SCSIDevice *d;
+    PVSCSIRequest *r = pvscsi_queue_pending_descriptor(s, &d, descr);
+    int64_t n;
+
+    trace_pvscsi_process_req_descr(descr->cdb[0], descr->context);
+
+    if (!d) {
+        r->cmp.hostStatus = BTSTAT_SELTIMEO;
+        trace_pvscsi_process_req_descr_unknown_device();
+        pvscsi_complete_request(s, r);
+        return;
+    }
+
+    if (descr->flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
+        r->sg.elemAddr = descr->dataAddr;
+    }
+
+    r->sreq = scsi_req_new(d, descr->context, r->lun, descr->cdb, r);
+    if (r->sreq->cmd.mode == SCSI_XFER_FROM_DEV &&
+        (descr->flags & PVSCSI_FLAG_CMD_DIR_TODEVICE)) {
+        r->cmp.hostStatus = BTSTAT_BADMSG;
+        trace_pvscsi_process_req_descr_invalid_dir();
+        scsi_req_cancel(r->sreq);
+        return;
+    }
+    if (r->sreq->cmd.mode == SCSI_XFER_TO_DEV &&
+        (descr->flags & PVSCSI_FLAG_CMD_DIR_TOHOST)) {
+        r->cmp.hostStatus = BTSTAT_BADMSG;
+        trace_pvscsi_process_req_descr_invalid_dir();
+        scsi_req_cancel(r->sreq);
+        return;
+    }
+
+    pvscsi_build_sglist(s, r);
+    n = scsi_req_enqueue(r->sreq);
+
+    if (n) {
+        scsi_req_continue(r->sreq);
+    }
+}
+
+static void
+pvscsi_process_io(PVSCSIState *s)
+{
+    PVSCSIRingReqDesc descr;
+    hwaddr next_descr_pa;
+
+    assert(s->rings_info_valid);
+    while ((next_descr_pa = pvscsi_ring_pop_req_descr(&s->rings)) != 0) {
+
+        /* Only read after production index verification */
+        smp_rmb();
+
+        trace_pvscsi_process_io(next_descr_pa);
+        cpu_physical_memory_read(next_descr_pa, &descr, sizeof(descr));
+        pvscsi_process_request_descriptor(s, &descr);
+    }
+
+    pvscsi_ring_flush_req(&s->rings);
+}
+
+static void
+pvscsi_dbg_dump_tx_rings_config(PVSCSICmdDescSetupRings *rc)
+{
+    int i;
+    trace_pvscsi_tx_rings_ppn("Rings State", rc->ringsStatePPN);
+
+    trace_pvscsi_tx_rings_num_pages("Request Ring", rc->reqRingNumPages);
+    for (i = 0; i < rc->reqRingNumPages; i++) {
+        trace_pvscsi_tx_rings_ppn("Request Ring", rc->reqRingPPNs[i]);
+    }
+
+    trace_pvscsi_tx_rings_num_pages("Confirm Ring", rc->cmpRingNumPages);
+    for (i = 0; i < rc->cmpRingNumPages; i++) {
+        trace_pvscsi_tx_rings_ppn("Confirm Ring", rc->reqRingPPNs[i]);
+    }
+}
+
+static uint64_t
+pvscsi_on_cmd_config(PVSCSIState *s)
+{
+    trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_CONFIG");
+    return PVSCSI_COMMAND_PROCESSING_FAILED;
+}
+
+static uint64_t
+pvscsi_on_cmd_unplug(PVSCSIState *s)
+{
+    trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_DEVICE_UNPLUG");
+    return PVSCSI_COMMAND_PROCESSING_FAILED;
+}
+
+static uint64_t
+pvscsi_on_issue_scsi(PVSCSIState *s)
+{
+    trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_ISSUE_SCSI");
+    return PVSCSI_COMMAND_PROCESSING_FAILED;
+}
+
+static uint64_t
+pvscsi_on_cmd_setup_rings(PVSCSIState *s)
+{
+    PVSCSICmdDescSetupRings *rc =
+        (PVSCSICmdDescSetupRings *) s->curr_cmd_data;
+
+    trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_RINGS");
+
+    pvscsi_dbg_dump_tx_rings_config(rc);
+    pvscsi_ring_init_data(&s->rings, rc);
+    s->rings_info_valid = TRUE;
+    return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+}
+
+static uint64_t
+pvscsi_on_cmd_abort(PVSCSIState *s)
+{
+    PVSCSICmdDescAbortCmd *cmd = (PVSCSICmdDescAbortCmd *) s->curr_cmd_data;
+    PVSCSIRequest *r, *next;
+
+    trace_pvscsi_on_cmd_abort(cmd->context, cmd->target);
+
+    QTAILQ_FOREACH_SAFE(r, &s->pending_queue, next, next) {
+        if (r->req.context == cmd->context) {
+            break;
+        }
+    }
+    if (r) {
+        assert(!r->completed);
+        r->cmp.hostStatus = BTSTAT_ABORTQUEUE;
+        scsi_req_cancel(r->sreq);
+    }
+
+    return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+}
+
+static uint64_t
+pvscsi_on_cmd_unknown(PVSCSIState *s)
+{
+    trace_pvscsi_on_cmd_unknown_data(s->curr_cmd_data[0]);
+    return PVSCSI_COMMAND_PROCESSING_FAILED;
+}
+
+static uint64_t
+pvscsi_on_cmd_reset_device(PVSCSIState *s)
+{
+    uint8_t target_lun = 0;
+    struct PVSCSICmdDescResetDevice *cmd =
+        (struct PVSCSICmdDescResetDevice *) s->curr_cmd_data;
+    SCSIDevice *sdev;
+
+    sdev = pvscsi_device_find(s, 0, cmd->target, cmd->lun, &target_lun);
+
+    trace_pvscsi_on_cmd_reset_dev(cmd->target, (int) target_lun, sdev);
+
+    if (sdev != NULL) {
+        s->resetting++;
+        device_reset(&sdev->qdev);
+        s->resetting--;
+        return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+    }
+
+    return PVSCSI_COMMAND_PROCESSING_FAILED;
+}
+
+static uint64_t
+pvscsi_on_cmd_reset_bus(PVSCSIState *s)
+{
+    trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_RESET_BUS");
+
+    s->resetting++;
+    qbus_reset_all_fn(&s->bus);
+    s->resetting--;
+    return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+}
+
+static uint64_t
+pvscsi_on_cmd_setup_msg_ring(PVSCSIState *s)
+{
+    PVSCSICmdDescSetupMsgRing *rc =
+        (PVSCSICmdDescSetupMsgRing *) s->curr_cmd_data;
+
+    trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_MSG_RING");
+
+    if (!s->use_msg) {
+        return PVSCSI_COMMAND_PROCESSING_FAILED;
+    }
+
+    if (s->rings_info_valid) {
+        pvscsi_ring_init_msg(&s->rings, rc);
+        s->msg_ring_info_valid = TRUE;
+    }
+    return sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(uint32_t);
+}
+
+static uint64_t
+pvscsi_on_cmd_adapter_reset(PVSCSIState *s)
+{
+    trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_ADAPTER_RESET");
+
+    pvscsi_reset_adapter(s);
+    return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
+}
+
+static const struct {
+    int       data_size;
+    uint64_t  (*handler_fn)(PVSCSIState *s);
+} pvscsi_commands[] = {
+    [PVSCSI_CMD_FIRST] = {
+        .data_size = 0,
+        .handler_fn = pvscsi_on_cmd_unknown,
+    },
+
+    /* Not implemented, data size defined based on what arrives on windows */
+    [PVSCSI_CMD_CONFIG] = {
+        .data_size = 6 * sizeof(uint32_t),
+        .handler_fn = pvscsi_on_cmd_config,
+    },
+
+    /* Command not implemented, data size is unknown */
+    [PVSCSI_CMD_ISSUE_SCSI] = {
+        .data_size = 0,
+        .handler_fn = pvscsi_on_issue_scsi,
+    },
+
+    /* Command not implemented, data size is unknown */
+    [PVSCSI_CMD_DEVICE_UNPLUG] = {
+        .data_size = 0,
+        .handler_fn = pvscsi_on_cmd_unplug,
+    },
+
+    [PVSCSI_CMD_SETUP_RINGS] = {
+        .data_size = sizeof(PVSCSICmdDescSetupRings),
+        .handler_fn = pvscsi_on_cmd_setup_rings,
+    },
+
+    [PVSCSI_CMD_RESET_DEVICE] = {
+        .data_size = sizeof(struct PVSCSICmdDescResetDevice),
+        .handler_fn = pvscsi_on_cmd_reset_device,
+    },
+
+    [PVSCSI_CMD_RESET_BUS] = {
+        .data_size = 0,
+        .handler_fn = pvscsi_on_cmd_reset_bus,
+    },
+
+    [PVSCSI_CMD_SETUP_MSG_RING] = {
+        .data_size = sizeof(PVSCSICmdDescSetupMsgRing),
+        .handler_fn = pvscsi_on_cmd_setup_msg_ring,
+    },
+
+    [PVSCSI_CMD_ADAPTER_RESET] = {
+        .data_size = 0,
+        .handler_fn = pvscsi_on_cmd_adapter_reset,
+    },
+
+    [PVSCSI_CMD_ABORT_CMD] = {
+        .data_size = sizeof(struct PVSCSICmdDescAbortCmd),
+        .handler_fn = pvscsi_on_cmd_abort,
+    },
+};
+
+static void
+pvscsi_do_command_processing(PVSCSIState *s)
+{
+    size_t bytes_arrived = s->curr_cmd_data_cntr * sizeof(uint32_t);
+
+    assert(s->curr_cmd < PVSCSI_CMD_LAST);
+    if (bytes_arrived >= pvscsi_commands[s->curr_cmd].data_size) {
+        s->reg_command_status = pvscsi_commands[s->curr_cmd].handler_fn(s);
+        s->curr_cmd = PVSCSI_CMD_FIRST;
+        s->curr_cmd_data_cntr   = 0;
+    }
+}
+
+static void
+pvscsi_on_command_data(PVSCSIState *s, uint32_t value)
+{
+    size_t bytes_arrived = s->curr_cmd_data_cntr * sizeof(uint32_t);
+
+    assert(bytes_arrived < sizeof(s->curr_cmd_data));
+    s->curr_cmd_data[s->curr_cmd_data_cntr++] = value;
+
+    pvscsi_do_command_processing(s);
+}
+
+static void
+pvscsi_on_command(PVSCSIState *s, uint64_t cmd_id)
+{
+    if ((cmd_id > PVSCSI_CMD_FIRST) && (cmd_id < PVSCSI_CMD_LAST)) {
+        s->curr_cmd = cmd_id;
+    } else {
+        s->curr_cmd = PVSCSI_CMD_FIRST;
+        trace_pvscsi_on_cmd_unknown(cmd_id);
+    }
+
+    s->curr_cmd_data_cntr = 0;
+    s->reg_command_status = PVSCSI_COMMAND_NOT_ENOUGH_DATA;
+
+    pvscsi_do_command_processing(s);
+}
+
+static void
+pvscsi_io_write(void *opaque, hwaddr addr,
+                uint64_t val, unsigned size)
+{
+    PVSCSIState *s = opaque;
+
+    switch (addr) {
+    case PVSCSI_REG_OFFSET_COMMAND:
+        pvscsi_on_command(s, val);
+        break;
+
+    case PVSCSI_REG_OFFSET_COMMAND_DATA:
+        pvscsi_on_command_data(s, (uint32_t) val);
+        break;
+
+    case PVSCSI_REG_OFFSET_INTR_STATUS:
+        trace_pvscsi_io_write("PVSCSI_REG_OFFSET_INTR_STATUS", val);
+        s->reg_interrupt_status &= ~val;
+        pvscsi_update_irq_status(s);
+        pvscsi_schedule_completion_processing(s);
+        break;
+
+    case PVSCSI_REG_OFFSET_INTR_MASK:
+        trace_pvscsi_io_write("PVSCSI_REG_OFFSET_INTR_MASK", val);
+        s->reg_interrupt_enabled = val;
+        pvscsi_update_irq_status(s);
+        break;
+
+    case PVSCSI_REG_OFFSET_KICK_NON_RW_IO:
+        trace_pvscsi_io_write("PVSCSI_REG_OFFSET_KICK_NON_RW_IO", val);
+        pvscsi_process_io(s);
+        break;
+
+    case PVSCSI_REG_OFFSET_KICK_RW_IO:
+        trace_pvscsi_io_write("PVSCSI_REG_OFFSET_KICK_RW_IO", val);
+        pvscsi_process_io(s);
+        break;
+
+    case PVSCSI_REG_OFFSET_DEBUG:
+        trace_pvscsi_io_write("PVSCSI_REG_OFFSET_DEBUG", val);
+        break;
+
+    default:
+        trace_pvscsi_io_write_unknown(addr, size, val);
+        break;
+    }
+
+}
+
+static uint64_t
+pvscsi_io_read(void *opaque, hwaddr addr, unsigned size)
+{
+    PVSCSIState *s = opaque;
+
+    switch (addr) {
+    case PVSCSI_REG_OFFSET_INTR_STATUS:
+        trace_pvscsi_io_read("PVSCSI_REG_OFFSET_INTR_STATUS",
+                             s->reg_interrupt_status);
+        return s->reg_interrupt_status;
+
+    case PVSCSI_REG_OFFSET_INTR_MASK:
+        trace_pvscsi_io_read("PVSCSI_REG_OFFSET_INTR_MASK",
+                             s->reg_interrupt_status);
+        return s->reg_interrupt_enabled;
+
+    case PVSCSI_REG_OFFSET_COMMAND_STATUS:
+        trace_pvscsi_io_read("PVSCSI_REG_OFFSET_COMMAND_STATUS",
+                             s->reg_interrupt_status);
+        return s->reg_command_status;
+
+    default:
+        trace_pvscsi_io_read_unknown(addr, size);
+        return 0;
+    }
+}
+
+
+static bool
+pvscsi_init_msi(PVSCSIState *s)
+{
+    int res;
+    PCIDevice *d = PCI_DEVICE(s);
+
+    res = msi_init(d, PVSCSI_MSI_OFFSET, PVSCSI_MSIX_NUM_VECTORS,
+                   PVSCSI_USE_64BIT, PVSCSI_PER_VECTOR_MASK);
+    if (res < 0) {
+        trace_pvscsi_init_msi_fail(res);
+        s->msi_used = false;
+    } else {
+        s->msi_used = true;
+    }
+
+    return s->msi_used;
+}
+
+static void
+pvscsi_cleanup_msi(PVSCSIState *s)
+{
+    PCIDevice *d = PCI_DEVICE(s);
+
+    if (s->msi_used) {
+        msi_uninit(d);
+    }
+}
+
+static const MemoryRegionOps pvscsi_ops = {
+        .read = pvscsi_io_read,
+        .write = pvscsi_io_write,
+        .endianness = DEVICE_LITTLE_ENDIAN,
+        .impl = {
+                .min_access_size = 4,
+                .max_access_size = 4,
+        },
+};
+
+static const struct SCSIBusInfo pvscsi_scsi_info = {
+        .tcq = true,
+        .max_target = PVSCSI_MAX_DEVS,
+        .max_channel = 0,
+        .max_lun = 0,
+
+        .get_sg_list = pvscsi_get_sg_list,
+        .complete = pvscsi_command_complete,
+        .cancel = pvscsi_request_cancelled,
+        .hotplug = pvscsi_hotplug,
+        .hot_unplug = pvscsi_hot_unplug,
+};
+
+static int
+pvscsi_init(PCIDevice *pci_dev)
+{
+    PVSCSIState *s = PVSCSI(pci_dev);
+
+    trace_pvscsi_state("init");
+
+    /* PCI subsystem ID */
+    pci_dev->config[PCI_SUBSYSTEM_ID] = 0x00;
+    pci_dev->config[PCI_SUBSYSTEM_ID + 1] = 0x10;
+
+    /* PCI latency timer = 255 */
+    pci_dev->config[PCI_LATENCY_TIMER] = 0xff;
+
+    /* Interrupt pin A */
+    pci_config_set_interrupt_pin(pci_dev->config, 1);
+
+    memory_region_init_io(&s->io_space, &pvscsi_ops, s,
+                          "pvscsi-io", PVSCSI_MEM_SPACE_SIZE);
+    pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->io_space);
+
+    pvscsi_init_msi(s);
+
+    s->completion_worker = qemu_bh_new(pvscsi_process_completion_queue, s);
+    if (!s->completion_worker) {
+        pvscsi_cleanup_msi(s);
+        memory_region_destroy(&s->io_space);
+        return -ENOMEM;
+    }
+
+    scsi_bus_new(&s->bus, &pci_dev->qdev, &pvscsi_scsi_info);
+    pvscsi_reset_state(s);
+
+    return 0;
+}
+
+static void
+pvscsi_uninit(PCIDevice *pci_dev)
+{
+    PVSCSIState *s = PVSCSI(pci_dev);
+
+    trace_pvscsi_state("uninit");
+    qemu_bh_delete(s->completion_worker);
+
+    pvscsi_cleanup_msi(s);
+
+    memory_region_destroy(&s->io_space);
+}
+
+static void
+pvscsi_reset(DeviceState *dev)
+{
+    PCIDevice *d = PCI_DEVICE(dev);
+    PVSCSIState *s = PVSCSI(d);
+
+    trace_pvscsi_state("reset");
+    pvscsi_reset_adapter(s);
+}
+
+static void
+pvscsi_pre_save(void *opaque)
+{
+    PVSCSIState *s = (PVSCSIState *) opaque;
+
+    trace_pvscsi_state("presave");
+
+    assert(QTAILQ_EMPTY(&s->pending_queue));
+    assert(QTAILQ_EMPTY(&s->completion_queue));
+}
+
+static int
+pvscsi_post_load(void *opaque, int version_id)
+{
+    trace_pvscsi_state("postload");
+    return 0;
+}
+
+static const VMStateDescription vmstate_pvscsi = {
+    .name = TYPE_PVSCSI,
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .minimum_version_id_old = 0,
+    .pre_save = pvscsi_pre_save,
+    .post_load = pvscsi_post_load,
+    .fields      = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(parent_obj, PVSCSIState),
+        VMSTATE_UINT8(msi_used, PVSCSIState),
+        VMSTATE_UINT32(resetting, PVSCSIState),
+        VMSTATE_UINT64(reg_interrupt_status, PVSCSIState),
+        VMSTATE_UINT64(reg_interrupt_enabled, PVSCSIState),
+        VMSTATE_UINT64(reg_command_status, PVSCSIState),
+        VMSTATE_UINT64(curr_cmd, PVSCSIState),
+        VMSTATE_UINT32(curr_cmd_data_cntr, PVSCSIState),
+        VMSTATE_UINT32_ARRAY(curr_cmd_data, PVSCSIState,
+                             ARRAY_SIZE(((PVSCSIState *)NULL)->curr_cmd_data)),
+        VMSTATE_UINT8(rings_info_valid, PVSCSIState),
+        VMSTATE_UINT8(msg_ring_info_valid, PVSCSIState),
+        VMSTATE_UINT8(use_msg, PVSCSIState),
+
+        VMSTATE_UINT64(rings.rs_pa, PVSCSIState),
+        VMSTATE_UINT32(rings.txr_len_mask, PVSCSIState),
+        VMSTATE_UINT32(rings.rxr_len_mask, PVSCSIState),
+        VMSTATE_UINT64_ARRAY(rings.req_ring_pages_pa, PVSCSIState,
+                             PVSCSI_SETUP_RINGS_MAX_NUM_PAGES),
+        VMSTATE_UINT64_ARRAY(rings.cmp_ring_pages_pa, PVSCSIState,
+                             PVSCSI_SETUP_RINGS_MAX_NUM_PAGES),
+        VMSTATE_UINT64(rings.consumed_ptr, PVSCSIState),
+        VMSTATE_UINT64(rings.filled_cmp_ptr, PVSCSIState),
+
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void
+pvscsi_write_config(PCIDevice *pci, uint32_t addr, uint32_t val, int len)
+{
+    pci_default_write_config(pci, addr, val, len);
+    msi_write_config(pci, addr, val, len);
+}
+
+static Property pvscsi_properties[] = {
+    DEFINE_PROP_UINT8("use_msg", PVSCSIState, use_msg, 1),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pvscsi_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->init = pvscsi_init;
+    k->exit = pvscsi_uninit;
+    k->vendor_id = PCI_VENDOR_ID_VMWARE;
+    k->device_id = PCI_DEVICE_ID_VMWARE_PVSCSI;
+    k->class_id = PCI_CLASS_STORAGE_SCSI;
+    k->subsystem_id = 0x1000;
+    dc->reset = pvscsi_reset;
+    dc->vmsd = &vmstate_pvscsi;
+    dc->props = pvscsi_properties;
+    k->config_write = pvscsi_write_config;
+}
+
+static const TypeInfo pvscsi_info = {
+    .name          = "pvscsi",
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(PVSCSIState),
+    .class_init    = pvscsi_class_init,
+};
+
+static void
+pvscsi_register_types(void)
+{
+    type_register_static(&pvscsi_info);
+}
+
+type_init(pvscsi_register_types);
diff --git a/hw/scsi/vmw_pvscsi.h b/hw/scsi/vmw_pvscsi.h
new file mode 100644
index 0000000000..17fcf66273
--- /dev/null
+++ b/hw/scsi/vmw_pvscsi.h
@@ -0,0 +1,434 @@
+/*
+ * VMware PVSCSI header file
+ *
+ * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; version 2 of the License and no later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained by: Arvind Kumar <arvindkumar@vmware.com>
+ *
+ */
+
+#ifndef VMW_PVSCSI_H
+#define VMW_PVSCSI_H
+
+#define VMW_PAGE_SIZE  (4096)
+#define VMW_PAGE_SHIFT (12)
+
+#define MASK(n)        ((1 << (n)) - 1)        /* make an n-bit mask */
+
+/*
+ * host adapter status/error codes
+ */
+enum HostBusAdapterStatus {
+   BTSTAT_SUCCESS       = 0x00,  /* CCB complete normally with no errors */
+   BTSTAT_LINKED_COMMAND_COMPLETED           = 0x0a,
+   BTSTAT_LINKED_COMMAND_COMPLETED_WITH_FLAG = 0x0b,
+   BTSTAT_DATA_UNDERRUN = 0x0c,
+   BTSTAT_SELTIMEO      = 0x11,  /* SCSI selection timeout */
+   BTSTAT_DATARUN       = 0x12,  /* data overrun/underrun */
+   BTSTAT_BUSFREE       = 0x13,  /* unexpected bus free */
+   BTSTAT_INVPHASE      = 0x14,  /* invalid bus phase or sequence */
+                                 /* requested by target           */
+   BTSTAT_LUNMISMATCH   = 0x17,  /* linked CCB has different LUN  */
+                                 /* from first CCB                */
+   BTSTAT_SENSFAILED    = 0x1b,  /* auto request sense failed */
+   BTSTAT_TAGREJECT     = 0x1c,  /* SCSI II tagged queueing message */
+                                 /* rejected by target              */
+   BTSTAT_BADMSG        = 0x1d,  /* unsupported message received by */
+                                 /* the host adapter                */
+   BTSTAT_HAHARDWARE    = 0x20,  /* host adapter hardware failed */
+   BTSTAT_NORESPONSE    = 0x21,  /* target did not respond to SCSI ATN, */
+                                 /* sent a SCSI RST                     */
+   BTSTAT_SENTRST       = 0x22,  /* host adapter asserted a SCSI RST */
+   BTSTAT_RECVRST       = 0x23,  /* other SCSI devices asserted a SCSI RST */
+   BTSTAT_DISCONNECT    = 0x24,  /* target device reconnected improperly */
+                                 /* (w/o tag)                            */
+   BTSTAT_BUSRESET      = 0x25,  /* host adapter issued BUS device reset */
+   BTSTAT_ABORTQUEUE    = 0x26,  /* abort queue generated */
+   BTSTAT_HASOFTWARE    = 0x27,  /* host adapter software error */
+   BTSTAT_HATIMEOUT     = 0x30,  /* host adapter hardware timeout error */
+   BTSTAT_SCSIPARITY    = 0x34,  /* SCSI parity error detected */
+};
+
+/*
+ * Register offsets.
+ *
+ * These registers are accessible both via i/o space and mm i/o.
+ */
+
+enum PVSCSIRegOffset {
+    PVSCSI_REG_OFFSET_COMMAND        =    0x0,
+    PVSCSI_REG_OFFSET_COMMAND_DATA   =    0x4,
+    PVSCSI_REG_OFFSET_COMMAND_STATUS =    0x8,
+    PVSCSI_REG_OFFSET_LAST_STS_0     =  0x100,
+    PVSCSI_REG_OFFSET_LAST_STS_1     =  0x104,
+    PVSCSI_REG_OFFSET_LAST_STS_2     =  0x108,
+    PVSCSI_REG_OFFSET_LAST_STS_3     =  0x10c,
+    PVSCSI_REG_OFFSET_INTR_STATUS    = 0x100c,
+    PVSCSI_REG_OFFSET_INTR_MASK      = 0x2010,
+    PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014,
+    PVSCSI_REG_OFFSET_DEBUG          = 0x3018,
+    PVSCSI_REG_OFFSET_KICK_RW_IO     = 0x4018,
+};
+
+/*
+ * Virtual h/w commands.
+ */
+
+enum PVSCSICommands {
+    PVSCSI_CMD_FIRST             = 0, /* has to be first */
+
+    PVSCSI_CMD_ADAPTER_RESET     = 1,
+    PVSCSI_CMD_ISSUE_SCSI        = 2,
+    PVSCSI_CMD_SETUP_RINGS       = 3,
+    PVSCSI_CMD_RESET_BUS         = 4,
+    PVSCSI_CMD_RESET_DEVICE      = 5,
+    PVSCSI_CMD_ABORT_CMD         = 6,
+    PVSCSI_CMD_CONFIG            = 7,
+    PVSCSI_CMD_SETUP_MSG_RING    = 8,
+    PVSCSI_CMD_DEVICE_UNPLUG     = 9,
+
+    PVSCSI_CMD_LAST              = 10  /* has to be last */
+};
+
+#define PVSCSI_COMMAND_PROCESSING_SUCCEEDED   (0)
+#define PVSCSI_COMMAND_PROCESSING_FAILED     (-1)
+#define PVSCSI_COMMAND_NOT_ENOUGH_DATA       (-2)
+
+/*
+ * Command descriptor for PVSCSI_CMD_RESET_DEVICE --
+ */
+
+struct PVSCSICmdDescResetDevice {
+    uint32_t    target;
+    uint8_t     lun[8];
+} QEMU_PACKED;
+
+typedef struct PVSCSICmdDescResetDevice PVSCSICmdDescResetDevice;
+
+/*
+ * Command descriptor for PVSCSI_CMD_ABORT_CMD --
+ *
+ * - currently does not support specifying the LUN.
+ * - pad should be 0.
+ */
+
+struct PVSCSICmdDescAbortCmd {
+    uint64_t    context;
+    uint32_t    target;
+    uint32_t    pad;
+} QEMU_PACKED;
+
+typedef struct PVSCSICmdDescAbortCmd PVSCSICmdDescAbortCmd;
+
+/*
+ * Command descriptor for PVSCSI_CMD_SETUP_RINGS --
+ *
+ * Notes:
+ * - reqRingNumPages and cmpRingNumPages need to be power of two.
+ * - reqRingNumPages and cmpRingNumPages need to be different from 0,
+ * - reqRingNumPages and cmpRingNumPages need to be inferior to
+ *   PVSCSI_SETUP_RINGS_MAX_NUM_PAGES.
+ */
+
+#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES        32
+struct PVSCSICmdDescSetupRings {
+    uint32_t    reqRingNumPages;
+    uint32_t    cmpRingNumPages;
+    uint64_t    ringsStatePPN;
+    uint64_t    reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
+    uint64_t    cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
+} QEMU_PACKED;
+
+typedef struct PVSCSICmdDescSetupRings PVSCSICmdDescSetupRings;
+
+/*
+ * Command descriptor for PVSCSI_CMD_SETUP_MSG_RING --
+ *
+ * Notes:
+ * - this command was not supported in the initial revision of the h/w
+ *   interface. Before using it, you need to check that it is supported by
+ *   writing PVSCSI_CMD_SETUP_MSG_RING to the 'command' register, then
+ *   immediately after read the 'command status' register:
+ *       * a value of -1 means that the cmd is NOT supported,
+ *       * a value != -1 means that the cmd IS supported.
+ *   If it's supported the 'command status' register should return:
+ *      sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(uint32_t).
+ * - this command should be issued _after_ the usual SETUP_RINGS so that the
+ *   RingsState page is already setup. If not, the command is a nop.
+ * - numPages needs to be a power of two,
+ * - numPages needs to be different from 0,
+ * - pad should be zero.
+ */
+
+#define PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES  16
+
+struct PVSCSICmdDescSetupMsgRing {
+    uint32_t    numPages;
+    uint32_t    pad;
+    uint64_t    ringPPNs[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
+} QEMU_PACKED;
+
+typedef struct PVSCSICmdDescSetupMsgRing PVSCSICmdDescSetupMsgRing;
+
+enum PVSCSIMsgType {
+    PVSCSI_MSG_DEV_ADDED          = 0,
+    PVSCSI_MSG_DEV_REMOVED        = 1,
+    PVSCSI_MSG_LAST               = 2,
+};
+
+/*
+ * Msg descriptor.
+ *
+ * sizeof(struct PVSCSIRingMsgDesc) == 128.
+ *
+ * - type is of type enum PVSCSIMsgType.
+ * - the content of args depend on the type of event being delivered.
+ */
+
+struct PVSCSIRingMsgDesc {
+    uint32_t    type;
+    uint32_t    args[31];
+} QEMU_PACKED;
+
+typedef struct PVSCSIRingMsgDesc PVSCSIRingMsgDesc;
+
+struct PVSCSIMsgDescDevStatusChanged {
+    uint32_t    type;  /* PVSCSI_MSG_DEV _ADDED / _REMOVED */
+    uint32_t    bus;
+    uint32_t    target;
+    uint8_t     lun[8];
+    uint32_t    pad[27];
+} QEMU_PACKED;
+
+typedef struct PVSCSIMsgDescDevStatusChanged PVSCSIMsgDescDevStatusChanged;
+
+/*
+ * Rings state.
+ *
+ * - the fields:
+ *    . msgProdIdx,
+ *    . msgConsIdx,
+ *    . msgNumEntriesLog2,
+ *   .. are only used once the SETUP_MSG_RING cmd has been issued.
+ * - 'pad' helps to ensure that the msg related fields are on their own
+ *   cache-line.
+ */
+
+struct PVSCSIRingsState {
+    uint32_t    reqProdIdx;
+    uint32_t    reqConsIdx;
+    uint32_t    reqNumEntriesLog2;
+
+    uint32_t    cmpProdIdx;
+    uint32_t    cmpConsIdx;
+    uint32_t    cmpNumEntriesLog2;
+
+    uint8_t     pad[104];
+
+    uint32_t    msgProdIdx;
+    uint32_t    msgConsIdx;
+    uint32_t    msgNumEntriesLog2;
+} QEMU_PACKED;
+
+typedef struct PVSCSIRingsState PVSCSIRingsState;
+
+/*
+ * Request descriptor.
+ *
+ * sizeof(RingReqDesc) = 128
+ *
+ * - context: is a unique identifier of a command. It could normally be any
+ *   64bit value, however we currently store it in the serialNumber variable
+ *   of struct SCSI_Command, so we have the following restrictions due to the
+ *   way this field is handled in the vmkernel storage stack:
+ *    * this value can't be 0,
+ *    * the upper 32bit need to be 0 since serialNumber is as a uint32_t.
+ *   Currently tracked as PR 292060.
+ * - dataLen: contains the total number of bytes that need to be transferred.
+ * - dataAddr:
+ *   * if PVSCSI_FLAG_CMD_WITH_SG_LIST is set: dataAddr is the PA of the first
+ *     s/g table segment, each s/g segment is entirely contained on a single
+ *     page of physical memory,
+ *   * if PVSCSI_FLAG_CMD_WITH_SG_LIST is NOT set, then dataAddr is the PA of
+ *     the buffer used for the DMA transfer,
+ * - flags:
+ *   * PVSCSI_FLAG_CMD_WITH_SG_LIST: see dataAddr above,
+ *   * PVSCSI_FLAG_CMD_DIR_NONE: no DMA involved,
+ *   * PVSCSI_FLAG_CMD_DIR_TOHOST: transfer from device to main memory,
+ *   * PVSCSI_FLAG_CMD_DIR_TODEVICE: transfer from main memory to device,
+ *   * PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB: reserved to handle CDBs larger than
+ *     16bytes. To be specified.
+ * - vcpuHint: vcpuId of the processor that will be most likely waiting for the
+ *   completion of the i/o. For guest OSes that use lowest priority message
+ *   delivery mode (such as windows), we use this "hint" to deliver the
+ *   completion action to the proper vcpu. For now, we can use the vcpuId of
+ *   the processor that initiated the i/o as a likely candidate for the vcpu
+ *   that will be waiting for the completion..
+ * - bus should be 0: we currently only support bus 0 for now.
+ * - unused should be zero'd.
+ */
+
+#define PVSCSI_FLAG_CMD_WITH_SG_LIST        (1 << 0)
+#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB     (1 << 1)
+#define PVSCSI_FLAG_CMD_DIR_NONE            (1 << 2)
+#define PVSCSI_FLAG_CMD_DIR_TOHOST          (1 << 3)
+#define PVSCSI_FLAG_CMD_DIR_TODEVICE        (1 << 4)
+
+#define PVSCSI_KNOWN_FLAGS \
+  (PVSCSI_FLAG_CMD_WITH_SG_LIST     | \
+   PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB  | \
+   PVSCSI_FLAG_CMD_DIR_NONE         | \
+   PVSCSI_FLAG_CMD_DIR_TOHOST       | \
+   PVSCSI_FLAG_CMD_DIR_TODEVICE)
+
+struct PVSCSIRingReqDesc {
+    uint64_t    context;
+    uint64_t    dataAddr;
+    uint64_t    dataLen;
+    uint64_t    senseAddr;
+    uint32_t    senseLen;
+    uint32_t    flags;
+    uint8_t     cdb[16];
+    uint8_t     cdbLen;
+    uint8_t     lun[8];
+    uint8_t     tag;
+    uint8_t     bus;
+    uint8_t     target;
+    uint8_t     vcpuHint;
+    uint8_t     unused[59];
+} QEMU_PACKED;
+
+typedef struct PVSCSIRingReqDesc PVSCSIRingReqDesc;
+
+/*
+ * Scatter-gather list management.
+ *
+ * As described above, when PVSCSI_FLAG_CMD_WITH_SG_LIST is set in the
+ * RingReqDesc.flags, then RingReqDesc.dataAddr is the PA of the first s/g
+ * table segment.
+ *
+ * - each segment of the s/g table contain a succession of struct
+ *   PVSCSISGElement.
+ * - each segment is entirely contained on a single physical page of memory.
+ * - a "chain" s/g element has the flag PVSCSI_SGE_FLAG_CHAIN_ELEMENT set in
+ *   PVSCSISGElement.flags and in this case:
+ *     * addr is the PA of the next s/g segment,
+ *     * length is undefined, assumed to be 0.
+ */
+
+struct PVSCSISGElement {
+    uint64_t    addr;
+    uint32_t    length;
+    uint32_t    flags;
+} QEMU_PACKED;
+
+typedef struct PVSCSISGElement PVSCSISGElement;
+
+/*
+ * Completion descriptor.
+ *
+ * sizeof(RingCmpDesc) = 32
+ *
+ * - context: identifier of the command. The same thing that was specified
+ *   under "context" as part of struct RingReqDesc at initiation time,
+ * - dataLen: number of bytes transferred for the actual i/o operation,
+ * - senseLen: number of bytes written into the sense buffer,
+ * - hostStatus: adapter status,
+ * - scsiStatus: device status,
+ * - pad should be zero.
+ */
+
+struct PVSCSIRingCmpDesc {
+    uint64_t    context;
+    uint64_t    dataLen;
+    uint32_t    senseLen;
+    uint16_t    hostStatus;
+    uint16_t    scsiStatus;
+    uint32_t    pad[2];
+} QEMU_PACKED;
+
+typedef struct PVSCSIRingCmpDesc PVSCSIRingCmpDesc;
+
+/*
+ * Interrupt status / IRQ bits.
+ */
+
+#define PVSCSI_INTR_CMPL_0                 (1 << 0)
+#define PVSCSI_INTR_CMPL_1                 (1 << 1)
+#define PVSCSI_INTR_CMPL_MASK              MASK(2)
+
+#define PVSCSI_INTR_MSG_0                  (1 << 2)
+#define PVSCSI_INTR_MSG_1                  (1 << 3)
+#define PVSCSI_INTR_MSG_MASK               (MASK(2) << 2)
+
+#define PVSCSI_INTR_ALL_SUPPORTED          MASK(4)
+
+/*
+ * Number of MSI-X vectors supported.
+ */
+#define PVSCSI_MAX_INTRS        24
+
+/*
+ * Enumeration of supported MSI-X vectors
+ */
+#define PVSCSI_VECTOR_COMPLETION   0
+
+/*
+ * Misc constants for the rings.
+ */
+
+#define PVSCSI_MAX_NUM_PAGES_REQ_RING   PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
+#define PVSCSI_MAX_NUM_PAGES_CMP_RING   PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
+#define PVSCSI_MAX_NUM_PAGES_MSG_RING   PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES
+
+#define PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE \
+                (VMW_PAGE_SIZE / sizeof(struct PVSCSIRingReqDesc))
+
+#define PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE \
+                (VMW_PAGE_SIZE / sizeof(PVSCSIRingCmpDesc))
+
+#define PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE \
+                (VMW_PAGE_SIZE / sizeof(PVSCSIRingMsgDesc))
+
+#define PVSCSI_MAX_REQ_QUEUE_DEPTH \
+    (PVSCSI_MAX_NUM_PAGES_REQ_RING * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE)
+
+#define PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES     1
+#define PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES 1
+#define PVSCSI_MEM_SPACE_MISC_NUM_PAGES        2
+#define PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES     2
+#define PVSCSI_MEM_SPACE_MSIX_NUM_PAGES        2
+
+enum PVSCSIMemSpace {
+    PVSCSI_MEM_SPACE_COMMAND_PAGE       = 0,
+    PVSCSI_MEM_SPACE_INTR_STATUS_PAGE   = 1,
+    PVSCSI_MEM_SPACE_MISC_PAGE          = 2,
+    PVSCSI_MEM_SPACE_KICK_IO_PAGE       = 4,
+    PVSCSI_MEM_SPACE_MSIX_TABLE_PAGE    = 6,
+    PVSCSI_MEM_SPACE_MSIX_PBA_PAGE      = 7,
+};
+
+#define PVSCSI_MEM_SPACE_NUM_PAGES \
+    (PVSCSI_MEM_SPACE_COMMAND_NUM_PAGES +       \
+     PVSCSI_MEM_SPACE_INTR_STATUS_NUM_PAGES +   \
+     PVSCSI_MEM_SPACE_MISC_NUM_PAGES +          \
+     PVSCSI_MEM_SPACE_KICK_IO_NUM_PAGES +       \
+     PVSCSI_MEM_SPACE_MSIX_NUM_PAGES)
+
+#define PVSCSI_MEM_SPACE_SIZE    (PVSCSI_MEM_SPACE_NUM_PAGES * VMW_PAGE_SIZE)
+
+#endif /* VMW_PVSCSI_H */