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/*
* VMApple specific VirtIO Block implementation
*
* 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.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* VMApple uses almost standard VirtIO Block, but with a few key differences:
*
* - Different PCI device/vendor ID
* - An additional "type" identifier to differentiate AUX and Root volumes
* - An additional BARRIER command
*/
#include "qemu/osdep.h"
#include "hw/vmapple/vmapple.h"
#include "hw/virtio/virtio-blk.h"
#include "hw/virtio/virtio-pci.h"
#include "qemu/bswap.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qapi/error.h"
#define TYPE_VMAPPLE_VIRTIO_BLK "vmapple-virtio-blk"
OBJECT_DECLARE_TYPE(VMAppleVirtIOBlk, VMAppleVirtIOBlkClass, VMAPPLE_VIRTIO_BLK)
typedef struct VMAppleVirtIOBlkClass {
VirtIOBlkClass parent;
void (*get_config)(VirtIODevice *vdev, uint8_t *config);
} VMAppleVirtIOBlkClass;
typedef struct VMAppleVirtIOBlk {
VirtIOBlock parent_obj;
uint32_t apple_type;
} VMAppleVirtIOBlk;
/*
* vmapple-virtio-blk-pci: This extends VirtioPCIProxy.
*/
OBJECT_DECLARE_SIMPLE_TYPE(VMAppleVirtIOBlkPCI, VMAPPLE_VIRTIO_BLK_PCI)
#define VIRTIO_BLK_T_APPLE_BARRIER 0x10000
static bool vmapple_virtio_blk_handle_unknown_request(VirtIOBlockReq *req,
MultiReqBuffer *mrb,
uint32_t type)
{
switch (type) {
case VIRTIO_BLK_T_APPLE_BARRIER:
qemu_log_mask(LOG_UNIMP, "%s: Barrier requests are currently no-ops\n",
__func__);
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
g_free(req);
return true;
default:
return false;
}
}
/*
* VMApple virtio-blk uses the same config format as normal virtio, with one
* exception: It adds an "apple type" specififer at the same location that
* the spec reserves for max_secure_erase_sectors. Let's hook into the
* get_config code path here, run it as usual and then patch in the apple type.
*/
static void vmapple_virtio_blk_get_config(VirtIODevice *vdev, uint8_t *config)
{
VMAppleVirtIOBlk *dev = VMAPPLE_VIRTIO_BLK(vdev);
VMAppleVirtIOBlkClass *vvbk = VMAPPLE_VIRTIO_BLK_GET_CLASS(dev);
struct virtio_blk_config *blkcfg = (struct virtio_blk_config *)config;
vvbk->get_config(vdev, config);
g_assert(dev->parent_obj.config_size >= endof(struct virtio_blk_config, zoned));
/* Apple abuses the field for max_secure_erase_sectors as type id */
stl_he_p(&blkcfg->max_secure_erase_sectors, dev->apple_type);
}
static void vmapple_virtio_blk_class_init(ObjectClass *klass, void *data)
{
VirtIOBlkClass *vbk = VIRTIO_BLK_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
VMAppleVirtIOBlkClass *vvbk = VMAPPLE_VIRTIO_BLK_CLASS(klass);
vbk->handle_unknown_request = vmapple_virtio_blk_handle_unknown_request;
vvbk->get_config = vdc->get_config;
vdc->get_config = vmapple_virtio_blk_get_config;
}
static const TypeInfo vmapple_virtio_blk_info = {
.name = TYPE_VMAPPLE_VIRTIO_BLK,
.parent = TYPE_VIRTIO_BLK,
.instance_size = sizeof(VMAppleVirtIOBlk),
.class_size = sizeof(VMAppleVirtIOBlkClass),
.class_init = vmapple_virtio_blk_class_init,
};
/* PCI Devices */
struct VMAppleVirtIOBlkPCI {
VirtIOPCIProxy parent_obj;
VMAppleVirtIOBlk vdev;
VMAppleVirtioBlkVariant variant;
};
static const Property vmapple_virtio_blk_pci_properties[] = {
DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
DEV_NVECTORS_UNSPECIFIED),
DEFINE_PROP_VMAPPLE_VIRTIO_BLK_VARIANT("variant", VMAppleVirtIOBlkPCI, variant,
VM_APPLE_VIRTIO_BLK_VARIANT_UNSPECIFIED),
};
static void vmapple_virtio_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
ERRP_GUARD();
VMAppleVirtIOBlkPCI *dev = VMAPPLE_VIRTIO_BLK_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
VirtIOBlkConf *conf = &dev->vdev.parent_obj.conf;
if (dev->variant == VM_APPLE_VIRTIO_BLK_VARIANT_UNSPECIFIED) {
error_setg(errp, "vmapple virtio block device variant unspecified");
error_append_hint(errp,
"Variant property must be set to 'aux' or 'root'.\n"
"Use a regular virtio-blk-pci device instead when "
"neither is applicaple.\n");
return;
}
if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
conf->num_queues = virtio_pci_optimal_num_queues(0);
}
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
vpci_dev->nvectors = conf->num_queues + 1;
}
/*
* We don't support zones, but we need the additional config space size.
* Let's just expose the feature so the rest of the virtio-blk logic
* allocates enough space for us. The guest will ignore zones anyway.
*/
virtio_add_feature(&dev->vdev.parent_obj.host_features, VIRTIO_BLK_F_ZONED);
/* Propagate the apple type down to the virtio-blk device */
dev->vdev.apple_type = dev->variant;
/* and spawn the virtio-blk device */
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
/*
* The virtio-pci machinery adjusts its vendor/device ID based on whether
* we support modern or legacy virtio. Let's patch it back to the Apple
* identifiers here.
*/
pci_config_set_vendor_id(vpci_dev->pci_dev.config, PCI_VENDOR_ID_APPLE);
pci_config_set_device_id(vpci_dev->pci_dev.config,
PCI_DEVICE_ID_APPLE_VIRTIO_BLK);
}
static void vmapple_virtio_blk_pci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
device_class_set_props(dc, vmapple_virtio_blk_pci_properties);
k->realize = vmapple_virtio_blk_pci_realize;
pcidev_k->vendor_id = PCI_VENDOR_ID_APPLE;
pcidev_k->device_id = PCI_DEVICE_ID_APPLE_VIRTIO_BLK;
pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
}
static void vmapple_virtio_blk_pci_instance_init(Object *obj)
{
VMAppleVirtIOBlkPCI *dev = VMAPPLE_VIRTIO_BLK_PCI(obj);
virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
TYPE_VMAPPLE_VIRTIO_BLK);
}
static const VirtioPCIDeviceTypeInfo vmapple_virtio_blk_pci_info = {
.generic_name = TYPE_VMAPPLE_VIRTIO_BLK_PCI,
.instance_size = sizeof(VMAppleVirtIOBlkPCI),
.instance_init = vmapple_virtio_blk_pci_instance_init,
.class_init = vmapple_virtio_blk_pci_class_init,
};
static void vmapple_virtio_blk_register_types(void)
{
type_register_static(&vmapple_virtio_blk_info);
virtio_pci_types_register(&vmapple_virtio_blk_pci_info);
}
type_init(vmapple_virtio_blk_register_types)
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