Commit 846da38d authored by Tianyu Lan's avatar Tianyu Lan Committed by Wei Liu

net: netvsc: Add Isolation VM support for netvsc driver

In Isolation VM, all shared memory with host needs to mark visible
to host via hvcall. vmbus_establish_gpadl() has already done it for
netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_
pagebuffer() stills need to be handled. Use DMA API to map/umap
these memory during sending/receiving packet and Hyper-V swiotlb
bounce buffer dma address will be returned. The swiotlb bounce buffer
has been masked to be visible to host during boot up.

rx/tx ring buffer is allocated via vzalloc() and they need to be
mapped into unencrypted address space(above vTOM) before sharing
with host and accessing. Add hv_map/unmap_memory() to map/umap rx
/tx ring buffer.
Signed-off-by: default avatarTianyu Lan <Tianyu.Lan@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20211213071407.314309-6-ltykernel@gmail.comSigned-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 743b237c
......@@ -287,3 +287,31 @@ int hv_set_mem_host_visibility(unsigned long kbuffer, int pagecount, bool visibl
kfree(pfn_array);
return ret;
}
/*
* hv_map_memory - map memory to extra space in the AMD SEV-SNP Isolation VM.
*/
void *hv_map_memory(void *addr, unsigned long size)
{
unsigned long *pfns = kcalloc(size / PAGE_SIZE,
sizeof(unsigned long), GFP_KERNEL);
void *vaddr;
int i;
if (!pfns)
return NULL;
for (i = 0; i < size / PAGE_SIZE; i++)
pfns[i] = vmalloc_to_pfn(addr + i * PAGE_SIZE) +
(ms_hyperv.shared_gpa_boundary >> PAGE_SHIFT);
vaddr = vmap_pfn(pfns, size / PAGE_SIZE, PAGE_KERNEL_IO);
kfree(pfns);
return vaddr;
}
void hv_unmap_memory(void *addr)
{
vunmap(addr);
}
......@@ -295,3 +295,14 @@ u64 __weak hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_s
return HV_STATUS_INVALID_PARAMETER;
}
EXPORT_SYMBOL_GPL(hv_ghcb_hypercall);
void __weak *hv_map_memory(void *addr, unsigned long size)
{
return NULL;
}
EXPORT_SYMBOL_GPL(hv_map_memory);
void __weak hv_unmap_memory(void *addr)
{
}
EXPORT_SYMBOL_GPL(hv_unmap_memory);
......@@ -164,6 +164,7 @@ struct hv_netvsc_packet {
u32 total_bytes;
u32 send_buf_index;
u32 total_data_buflen;
struct hv_dma_range *dma_range;
};
#define NETVSC_HASH_KEYLEN 40
......@@ -1074,6 +1075,7 @@ struct netvsc_device {
/* Receive buffer allocated by us but manages by NetVSP */
void *recv_buf;
void *recv_original_buf;
u32 recv_buf_size; /* allocated bytes */
struct vmbus_gpadl recv_buf_gpadl_handle;
u32 recv_section_cnt;
......@@ -1082,6 +1084,7 @@ struct netvsc_device {
/* Send buffer allocated by us */
void *send_buf;
void *send_original_buf;
u32 send_buf_size;
struct vmbus_gpadl send_buf_gpadl_handle;
u32 send_section_cnt;
......@@ -1731,4 +1734,6 @@ struct rndis_message {
#define RETRY_US_HI 10000
#define RETRY_MAX 2000 /* >10 sec */
void netvsc_dma_unmap(struct hv_device *hv_dev,
struct hv_netvsc_packet *packet);
#endif /* _HYPERV_NET_H */
......@@ -153,8 +153,21 @@ static void free_netvsc_device(struct rcu_head *head)
int i;
kfree(nvdev->extension);
if (nvdev->recv_original_buf) {
hv_unmap_memory(nvdev->recv_buf);
vfree(nvdev->recv_original_buf);
} else {
vfree(nvdev->recv_buf);
}
if (nvdev->send_original_buf) {
hv_unmap_memory(nvdev->send_buf);
vfree(nvdev->send_original_buf);
} else {
vfree(nvdev->send_buf);
}
kfree(nvdev->send_section_map);
for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
......@@ -338,6 +351,7 @@ static int netvsc_init_buf(struct hv_device *device,
unsigned int buf_size;
size_t map_words;
int i, ret = 0;
void *vaddr;
/* Get receive buffer area. */
buf_size = device_info->recv_sections * device_info->recv_section_size;
......@@ -373,6 +387,17 @@ static int netvsc_init_buf(struct hv_device *device,
goto cleanup;
}
if (hv_isolation_type_snp()) {
vaddr = hv_map_memory(net_device->recv_buf, buf_size);
if (!vaddr) {
ret = -ENOMEM;
goto cleanup;
}
net_device->recv_original_buf = net_device->recv_buf;
net_device->recv_buf = vaddr;
}
/* Notify the NetVsp of the gpadl handle */
init_packet = &net_device->channel_init_pkt;
memset(init_packet, 0, sizeof(struct nvsp_message));
......@@ -476,6 +501,17 @@ static int netvsc_init_buf(struct hv_device *device,
goto cleanup;
}
if (hv_isolation_type_snp()) {
vaddr = hv_map_memory(net_device->send_buf, buf_size);
if (!vaddr) {
ret = -ENOMEM;
goto cleanup;
}
net_device->send_original_buf = net_device->send_buf;
net_device->send_buf = vaddr;
}
/* Notify the NetVsp of the gpadl handle */
init_packet = &net_device->channel_init_pkt;
memset(init_packet, 0, sizeof(struct nvsp_message));
......@@ -766,7 +802,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev,
/* Notify the layer above us */
if (likely(skb)) {
const struct hv_netvsc_packet *packet
struct hv_netvsc_packet *packet
= (struct hv_netvsc_packet *)skb->cb;
u32 send_index = packet->send_buf_index;
struct netvsc_stats *tx_stats;
......@@ -782,6 +818,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev,
tx_stats->bytes += packet->total_bytes;
u64_stats_update_end(&tx_stats->syncp);
netvsc_dma_unmap(ndev_ctx->device_ctx, packet);
napi_consume_skb(skb, budget);
}
......@@ -946,6 +983,88 @@ static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
memset(dest, 0, padding);
}
void netvsc_dma_unmap(struct hv_device *hv_dev,
struct hv_netvsc_packet *packet)
{
u32 page_count = packet->cp_partial ?
packet->page_buf_cnt - packet->rmsg_pgcnt :
packet->page_buf_cnt;
int i;
if (!hv_is_isolation_supported())
return;
if (!packet->dma_range)
return;
for (i = 0; i < page_count; i++)
dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma,
packet->dma_range[i].mapping_size,
DMA_TO_DEVICE);
kfree(packet->dma_range);
}
/* netvsc_dma_map - Map swiotlb bounce buffer with data page of
* packet sent by vmbus_sendpacket_pagebuffer() in the Isolation
* VM.
*
* In isolation VM, netvsc send buffer has been marked visible to
* host and so the data copied to send buffer doesn't need to use
* bounce buffer. The data pages handled by vmbus_sendpacket_pagebuffer()
* may not be copied to send buffer and so these pages need to be
* mapped with swiotlb bounce buffer. netvsc_dma_map() is to do
* that. The pfns in the struct hv_page_buffer need to be converted
* to bounce buffer's pfn. The loop here is necessary because the
* entries in the page buffer array are not necessarily full
* pages of data. Each entry in the array has a separate offset and
* len that may be non-zero, even for entries in the middle of the
* array. And the entries are not physically contiguous. So each
* entry must be individually mapped rather than as a contiguous unit.
* So not use dma_map_sg() here.
*/
static int netvsc_dma_map(struct hv_device *hv_dev,
struct hv_netvsc_packet *packet,
struct hv_page_buffer *pb)
{
u32 page_count = packet->cp_partial ?
packet->page_buf_cnt - packet->rmsg_pgcnt :
packet->page_buf_cnt;
dma_addr_t dma;
int i;
if (!hv_is_isolation_supported())
return 0;
packet->dma_range = kcalloc(page_count,
sizeof(*packet->dma_range),
GFP_KERNEL);
if (!packet->dma_range)
return -ENOMEM;
for (i = 0; i < page_count; i++) {
char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT)
+ pb[i].offset);
u32 len = pb[i].len;
dma = dma_map_single(&hv_dev->device, src, len,
DMA_TO_DEVICE);
if (dma_mapping_error(&hv_dev->device, dma)) {
kfree(packet->dma_range);
return -ENOMEM;
}
/* pb[].offset and pb[].len are not changed during dma mapping
* and so not reassign.
*/
packet->dma_range[i].dma = dma;
packet->dma_range[i].mapping_size = len;
pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT;
}
return 0;
}
static inline int netvsc_send_pkt(
struct hv_device *device,
struct hv_netvsc_packet *packet,
......@@ -986,14 +1105,24 @@ static inline int netvsc_send_pkt(
trace_nvsp_send_pkt(ndev, out_channel, rpkt);
packet->dma_range = NULL;
if (packet->page_buf_cnt) {
if (packet->cp_partial)
pb += packet->rmsg_pgcnt;
ret = netvsc_dma_map(ndev_ctx->device_ctx, packet, pb);
if (ret) {
ret = -EAGAIN;
goto exit;
}
ret = vmbus_sendpacket_pagebuffer(out_channel,
pb, packet->page_buf_cnt,
&nvmsg, sizeof(nvmsg),
req_id);
if (ret)
netvsc_dma_unmap(ndev_ctx->device_ctx, packet);
} else {
ret = vmbus_sendpacket(out_channel,
&nvmsg, sizeof(nvmsg),
......@@ -1001,6 +1130,7 @@ static inline int netvsc_send_pkt(
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
}
exit:
if (ret == 0) {
atomic_inc_return(&nvchan->queue_sends);
......
......@@ -2512,6 +2512,7 @@ static int netvsc_probe(struct hv_device *dev,
net->netdev_ops = &device_ops;
net->ethtool_ops = &ethtool_ops;
SET_NETDEV_DEV(net, &dev->device);
dma_set_min_align_mask(&dev->device, HV_HYP_PAGE_SIZE - 1);
/* We always need headroom for rndis header */
net->needed_headroom = RNDIS_AND_PPI_SIZE;
......
......@@ -361,6 +361,8 @@ static void rndis_filter_receive_response(struct net_device *ndev,
}
}
netvsc_dma_unmap(((struct net_device_context *)
netdev_priv(ndev))->device_ctx, &request->pkt);
complete(&request->wait_event);
} else {
netdev_err(ndev,
......
......@@ -269,6 +269,8 @@ bool hv_isolation_type_snp(void);
u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size);
void hyperv_cleanup(void);
bool hv_query_ext_cap(u64 cap_query);
void *hv_map_memory(void *addr, unsigned long size);
void hv_unmap_memory(void *addr);
#else /* CONFIG_HYPERV */
static inline bool hv_is_hyperv_initialized(void) { return false; }
static inline bool hv_is_hibernation_supported(void) { return false; }
......
......@@ -1584,6 +1584,11 @@ struct hyperv_service_callback {
void (*callback)(void *context);
};
struct hv_dma_range {
dma_addr_t dma;
u32 mapping_size;
};
#define MAX_SRV_VER 0x7ffffff
extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen,
const int *fw_version, int fw_vercnt,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment