[PATCH v4 11/15] hw/vmapple/bdif: Introduce vmapple backdoor interface

[Phil Dennis-Jordan <phil@philjordan.eu>]

From: Alexander Graf <graf@amazon.com>

The VMApple machine exposes AUX and ROOT block devices (as well as USB OTG
emulation) via virtio-pci as well as a special, simple backdoor platform
device.

This patch implements this backdoor platform device to the best of my
understanding. I left out any USB OTG parts; they're only needed for
guest recovery and I don't understand the protocol yet.

Signed-off-by: Alexander Graf <graf@amazon.com>
Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
---
v4:

 * Moved most header code to .c, rest to vmapple.h
 * Better compliance with coding, naming, and formatting conventions.

 hw/vmapple/Kconfig           |   3 +
 hw/vmapple/bdif.c            | 259 +++++++++++++++++++++++++++++++++++
 hw/vmapple/meson.build       |   1 +
 hw/vmapple/trace-events      |   5 +
 include/hw/vmapple/vmapple.h |  15 ++
 5 files changed, 283 insertions(+)
 create mode 100644 hw/vmapple/bdif.c
 create mode 100644 include/hw/vmapple/vmapple.h

diff --git a/hw/vmapple/Kconfig b/hw/vmapple/Kconfig
index a73504d5999..68f88876eb9 100644
--- a/hw/vmapple/Kconfig
+++ b/hw/vmapple/Kconfig
@@ -1,3 +1,6 @@
 config VMAPPLE_AES
     bool
 
+config VMAPPLE_BDIF
+    bool
+
diff --git a/hw/vmapple/bdif.c b/hw/vmapple/bdif.c
new file mode 100644
index 00000000000..8a697d759bd
--- /dev/null
+++ b/hw/vmapple/bdif.c
@@ -0,0 +1,259 @@
+/*
+ * VMApple Backdoor Interface
+ *
+ * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/units.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "trace.h"
+#include "hw/vmapple/vmapple.h"
+#include "hw/sysbus.h"
+#include "hw/block/block.h"
+#include "qapi/error.h"
+#include "sysemu/block-backend.h"
+
+OBJECT_DECLARE_SIMPLE_TYPE(VMAppleBdifState, VMAPPLE_BDIF)
+
+struct VMAppleBdifState {
+    SysBusDevice parent_obj;
+
+    BlockBackend *aux;
+    BlockBackend *root;
+    MemoryRegion mmio;
+};
+
+#define VMAPPLE_BDIF_SIZE   0x00200000
+
+#define REG_DEVID_MASK      0xffff0000
+#define DEVID_ROOT          0x00000000
+#define DEVID_AUX           0x00010000
+#define DEVID_USB           0x00100000
+
+#define REG_STATUS          0x0
+#define REG_STATUS_ACTIVE     BIT(0)
+#define REG_CFG             0x4
+#define REG_CFG_ACTIVE        BIT(1)
+#define REG_UNK1            0x8
+#define REG_BUSY            0x10
+#define REG_BUSY_READY        BIT(0)
+#define REG_UNK2            0x400
+#define REG_CMD             0x408
+#define REG_NEXT_DEVICE     0x420
+#define REG_UNK3            0x434
+
+typedef struct VblkSector {
+    uint32_t pad;
+    uint32_t pad2;
+    uint32_t sector;
+    uint32_t pad3;
+} VblkSector;
+
+typedef struct VblkReqCmd {
+    uint64_t addr;
+    uint32_t len;
+    uint32_t flags;
+} VblkReqCmd;
+
+typedef struct VblkReq {
+    VblkReqCmd sector;
+    VblkReqCmd data;
+    VblkReqCmd retval;
+} VblkReq;
+
+#define VBLK_DATA_FLAGS_READ  0x00030001
+#define VBLK_DATA_FLAGS_WRITE 0x00010001
+
+#define VBLK_RET_SUCCESS  0
+#define VBLK_RET_FAILED   1
+
+static uint64_t bdif_read(void *opaque, hwaddr offset, unsigned size)
+{
+    uint64_t ret = -1;
+    uint64_t devid = offset & REG_DEVID_MASK;
+
+    switch (offset & ~REG_DEVID_MASK) {
+    case REG_STATUS:
+        ret = REG_STATUS_ACTIVE;
+        break;
+    case REG_CFG:
+        ret = REG_CFG_ACTIVE;
+        break;
+    case REG_UNK1:
+        ret = 0x420;
+        break;
+    case REG_BUSY:
+        ret = REG_BUSY_READY;
+        break;
+    case REG_UNK2:
+        ret = 0x1;
+        break;
+    case REG_UNK3:
+        ret = 0x0;
+        break;
+    case REG_NEXT_DEVICE:
+        switch (devid) {
+        case DEVID_ROOT:
+            ret = 0x8000000;
+            break;
+        case DEVID_AUX:
+            ret = 0x10000;
+            break;
+        }
+        break;
+    }
+
+    trace_bdif_read(offset, size, ret);
+    return ret;
+}
+
+static void le2cpu_sector(VblkSector *sector)
+{
+    sector->sector = le32_to_cpu(sector->sector);
+}
+
+static void le2cpu_reqcmd(VblkReqCmd *cmd)
+{
+    cmd->addr = le64_to_cpu(cmd->addr);
+    cmd->len = le32_to_cpu(cmd->len);
+    cmd->flags = le32_to_cpu(cmd->flags);
+}
+
+static void le2cpu_req(VblkReq *req)
+{
+    le2cpu_reqcmd(&req->sector);
+    le2cpu_reqcmd(&req->data);
+    le2cpu_reqcmd(&req->retval);
+}
+
+static void vblk_cmd(uint64_t devid, BlockBackend *blk, uint64_t value,
+                     uint64_t static_off)
+{
+    VblkReq req;
+    VblkSector sector;
+    uint64_t off = 0;
+    char *buf = NULL;
+    uint8_t ret = VBLK_RET_FAILED;
+    int r;
+
+    cpu_physical_memory_read(value, &req, sizeof(req));
+    le2cpu_req(&req);
+
+    if (req.sector.len != sizeof(sector)) {
+        ret = VBLK_RET_FAILED;
+        goto out;
+    }
+
+    /* Read the vblk command */
+    cpu_physical_memory_read(req.sector.addr, &sector, sizeof(sector));
+    le2cpu_sector(&sector);
+
+    off = sector.sector * 512ULL + static_off;
+
+    /* Sanity check that we're not allocating bogus sizes */
+    if (req.data.len > 128 * MiB) {
+        goto out;
+    }
+
+    buf = g_malloc0(req.data.len);
+    switch (req.data.flags) {
+    case VBLK_DATA_FLAGS_READ:
+        r = blk_pread(blk, off, req.data.len, buf, 0);
+        trace_bdif_vblk_read(devid == DEVID_AUX ? "aux" : "root",
+                             req.data.addr, off, req.data.len, r);
+        if (r < 0) {
+            goto out;
+        }
+        cpu_physical_memory_write(req.data.addr, buf, req.data.len);
+        ret = VBLK_RET_SUCCESS;
+        break;
+    case VBLK_DATA_FLAGS_WRITE:
+        /* Not needed, iBoot only reads */
+        break;
+    default:
+        break;
+    }
+
+out:
+    g_free(buf);
+    cpu_physical_memory_write(req.retval.addr, &ret, 1);
+}
+
+static void bdif_write(void *opaque, hwaddr offset,
+                       uint64_t value, unsigned size)
+{
+    VMAppleBdifState *s = opaque;
+    uint64_t devid = (offset & REG_DEVID_MASK);
+
+    trace_bdif_write(offset, size, value);
+
+    switch (offset & ~REG_DEVID_MASK) {
+    case REG_CMD:
+        switch (devid) {
+        case DEVID_ROOT:
+            vblk_cmd(devid, s->root, value, 0x0);
+            break;
+        case DEVID_AUX:
+            vblk_cmd(devid, s->aux, value, 0x0);
+            break;
+        }
+        break;
+    }
+}
+
+static const MemoryRegionOps bdif_ops = {
+    .read = bdif_read,
+    .write = bdif_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 8,
+    },
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 8,
+    },
+};
+
+static void bdif_init(Object *obj)
+{
+    VMAppleBdifState *s = VMAPPLE_BDIF(obj);
+
+    memory_region_init_io(&s->mmio, obj, &bdif_ops, obj,
+                         "VMApple Backdoor Interface", VMAPPLE_BDIF_SIZE);
+    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+}
+
+static Property bdif_properties[] = {
+    DEFINE_PROP_DRIVE("aux", VMAppleBdifState, aux),
+    DEFINE_PROP_DRIVE("root", VMAppleBdifState, root),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void bdif_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->desc = "VMApple Backdoor Interface";
+    device_class_set_props(dc, bdif_properties);
+}
+
+static const TypeInfo bdif_info = {
+    .name          = TYPE_VMAPPLE_BDIF,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(VMAppleBdifState),
+    .instance_init = bdif_init,
+    .class_init    = bdif_class_init,
+};
+
+static void bdif_register_types(void)
+{
+    type_register_static(&bdif_info);
+}
+
+type_init(bdif_register_types)
diff --git a/hw/vmapple/meson.build b/hw/vmapple/meson.build
index bcd4dcb28d2..d4624713deb 100644
--- a/hw/vmapple/meson.build
+++ b/hw/vmapple/meson.build
@@ -1 +1,2 @@
 system_ss.add(when: 'CONFIG_VMAPPLE_AES',  if_true: files('aes.c'))
+system_ss.add(when: 'CONFIG_VMAPPLE_BDIF', if_true: files('bdif.c'))
diff --git a/hw/vmapple/trace-events b/hw/vmapple/trace-events
index 12757bc0852..6c3fdb389a6 100644
--- a/hw/vmapple/trace-events
+++ b/hw/vmapple/trace-events
@@ -16,3 +16,8 @@ aes_2_write_unknown(uint64_t offset) "offset=0x%"PRIx64
 aes_2_write(uint64_t offset, uint64_t val) "offset=0x%"PRIx64" val=0x%"PRIx64
 aes_dump_data(const char *desc, const char *hex) "%s%s"
 
+# bdif.c
+bdif_read(uint64_t offset, uint32_t size, uint64_t value) "offset=0x%"PRIx64" size=0x%x value=0x%"PRIx64
+bdif_write(uint64_t offset, uint32_t size, uint64_t value) "offset=0x%"PRIx64" size=0x%x value=0x%"PRIx64
+bdif_vblk_read(const char *dev, uint64_t addr, uint64_t offset, uint32_t len, int r) "dev=%s addr=0x%"PRIx64" off=0x%"PRIx64" size=0x%x r=%d"
+
diff --git a/include/hw/vmapple/vmapple.h b/include/hw/vmapple/vmapple.h
new file mode 100644
index 00000000000..a4c87b166d5
--- /dev/null
+++ b/include/hw/vmapple/vmapple.h
@@ -0,0 +1,15 @@
+/*
+ * Devices specific to the VMApple machine type
+ *
+ * Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef HW_VMAPPLE_VMAPPLE_H
+#define HW_VMAPPLE_VMAPPLE_H
+
+#define TYPE_VMAPPLE_BDIF "vmapple-bdif"
+
+#endif /* HW_VMAPPLE_VMAPPLE_H */
-- 
2.39.3 (Apple Git-145)