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vfio-user: add disable-mappable-bar0 flag

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It can be useful for testing or development purposes to force clients to write
to doorbells using vfio-user messages instead of directly into shared memory;
add a transport-specific option to disable the shared mapping.

Signed-off-by: John Levon <john.levon@nutanix.com>
Change-Id: I7ed062fbe211ba27c85d00b12d81a0f84a8322ed
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7554
Community-CI: Broadcom CI
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
John Levon 2021-04-21 16:56:51 +00:00 committed by Tomasz Zawadzki
parent 4f1530c9eb
commit bbfbcc1967
1 changed files with 43 additions and 9 deletions
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46
lib/nvmf/vfio_user.c
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@ -193,8 +193,13 @@ struct nvmf_vfio_user_endpoint {
TAILQ_ENTRY(nvmf_vfio_user_endpoint) link;
};
struct nvmf_vfio_user_transport_opts {
bool disable_mappable_bar0;
};
struct nvmf_vfio_user_transport {
struct spdk_nvmf_transport transport;
struct nvmf_vfio_user_transport_opts transport_opts;
pthread_mutex_t lock;
TAILQ_HEAD(, nvmf_vfio_user_endpoint) endpoints;
@ -324,6 +329,14 @@ nvmf_vfio_user_destroy(struct spdk_nvmf_transport *transport,
return 0;
}
static const struct spdk_json_object_decoder vfio_user_transport_opts_decoder[] = {
{
"disable-mappable-bar0",
offsetof(struct nvmf_vfio_user_transport, transport_opts.disable_mappable_bar0),
spdk_json_decode_bool, true
},
};
static struct spdk_nvmf_transport *
nvmf_vfio_user_create(struct spdk_nvmf_transport_opts *opts)
{
@ -345,6 +358,18 @@ nvmf_vfio_user_create(struct spdk_nvmf_transport_opts *opts)
TAILQ_INIT(&vu_transport->endpoints);
TAILQ_INIT(&vu_transport->new_qps);
if (opts->transport_specific != NULL &&
spdk_json_decode_object_relaxed(opts->transport_specific, vfio_user_transport_opts_decoder,
SPDK_COUNTOF(vfio_user_transport_opts_decoder),
vu_transport)) {
SPDK_ERRLOG("spdk_json_decode_object_relaxed failed\n");
free(vu_transport);
return NULL;
}
SPDK_DEBUGLOG(nvmf_vfio, "vfio_user transport: disable_mappable_bar0=%d\n",
vu_transport->transport_opts.disable_mappable_bar0);
return &vu_transport->transport;
err:
@ -1330,10 +1355,10 @@ access_bar0_fn(vfu_ctx_t *vfu_ctx, char *buf, size_t count, loff_t pos,
if (pos >= NVMF_VFIO_USER_DOORBELLS_OFFSET) {
/*
* XXX The fact that the doorbells can be memory mapped doesn't
* mean thath the client (VFIO in QEMU) is obliged to memory
* map them, it might still elect to access them via regular
* read/write.
* The fact that the doorbells can be memory mapped doesn't mean
* that the client (VFIO in QEMU) is obliged to memory map them,
* it might still elect to access them via regular read/write;
* we might also have had disable_mappable_bar0 set.
*/
ret = handle_dbl_access(ctrlr, (uint32_t *)buf, count,
pos, is_write);
@ -1442,7 +1467,8 @@ init_pci_config_space(vfu_pci_config_space_t *p)
}
static int
vfio_user_dev_info_fill(struct nvmf_vfio_user_endpoint *endpoint)
vfio_user_dev_info_fill(struct nvmf_vfio_user_transport *vu_transport,
struct nvmf_vfio_user_endpoint *endpoint)
{
int ret;
ssize_t cap_offset;
@ -1508,9 +1534,16 @@ vfio_user_dev_info_fill(struct nvmf_vfio_user_endpoint *endpoint)
return ret;
}
if (vu_transport->transport_opts.disable_mappable_bar0) {
ret = vfu_setup_region(vfu_ctx, VFU_PCI_DEV_BAR0_REGION_IDX, NVME_REG_BAR0_SIZE,
access_bar0_fn, VFU_REGION_FLAG_RW | VFU_REGION_FLAG_MEM,
NULL, 0, -1);
} else {
ret = vfu_setup_region(vfu_ctx, VFU_PCI_DEV_BAR0_REGION_IDX, NVME_REG_BAR0_SIZE,
access_bar0_fn, VFU_REGION_FLAG_RW | VFU_REGION_FLAG_MEM,
sparse_mmap, 1, endpoint->fd);
}
if (ret < 0) {
SPDK_ERRLOG("vfu_ctx %p failed to setup bar 0\n", vfu_ctx);
return ret;
@ -1711,7 +1744,7 @@ nvmf_vfio_user_listen(struct spdk_nvmf_transport *transport,
vfu_setup_log(endpoint->vfu_ctx, vfio_user_log,
SPDK_DEBUGLOG_FLAG_ENABLED("nvmf_vfio") ? LOG_DEBUG : LOG_ERR);
err = vfio_user_dev_info_fill(endpoint);
err = vfio_user_dev_info_fill(vu_transport, endpoint);
if (err < 0) {
goto out;
}
@ -2452,6 +2485,7 @@ nvmf_vfio_user_opts_init(struct spdk_nvmf_transport_opts *opts)
opts->max_aq_depth = NVMF_VFIO_USER_DEFAULT_AQ_DEPTH;
opts->num_shared_buffers = NVMF_VFIO_USER_DEFAULT_NUM_SHARED_BUFFERS;
opts->buf_cache_size = NVMF_VFIO_USER_DEFAULT_BUFFER_CACHE_SIZE;
opts->transport_specific = NULL;
}
const struct spdk_nvmf_transport_ops spdk_nvmf_transport_vfio_user = {