[PATCH V2 13/14] HV/Netvsc: Add Isolation VM support for netvsc driver

Tianyu Lan
2021-08-04T18:47:24Z

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() still need to handle. Use DMA API to map/umap these
memory during sending/receiving packet and Hyper-V DMA ops callback
will use swiotlb function to allocate bounce buffer and copy data
from/to bounce buffer.

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
drivers/net/hyperv/hyperv_net.h | 6 ++
drivers/net/hyperv/netvsc.c | 144 +++++++++++++++++++++++++++++-
drivers/net/hyperv/rndis_filter.c | 2 +
include/linux/hyperv.h | 5 ++
4 files changed, 154 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index bc48855dff10..862419912bfb 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -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 */
u32 recv_buf_gpadl_handle;
u32 recv_section_cnt;
@@ -1082,6 +1084,8 @@ struct netvsc_device {

/* Send buffer allocated by us */
void *send_buf;
+ void *send_original_buf;
+ u32 send_buf_size;
u32 send_buf_gpadl_handle;
u32 send_section_cnt;
u32 send_section_size;
@@ -1730,4 +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 */
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 7bd935412853..fc312e5db4d5 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -153,8 +153,21 @@ static void free_netvsc_device(struct rcu_head *head)
int i;

kfree(nvdev->extension);
- vfree(nvdev->recv_buf);
- vfree(nvdev->send_buf);
+
+ if (nvdev->recv_original_buf) {
+ vunmap(nvdev->recv_buf);
+ vfree(nvdev->recv_original_buf);
+ } else {
+ vfree(nvdev->recv_buf);
+ }
+
+ if (nvdev->send_original_buf) {
+ vunmap(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++) {
@@ -330,6 +343,27 @@ int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
return nvchan->mrc.slots ? 0 : -ENOMEM;
}

+static void *netvsc_remap_buf(void *buf, unsigned long size)
+{
+ unsigned long *pfns;
+ void *vaddr;
+ int i;
+
+ pfns = kcalloc(size / HV_HYP_PAGE_SIZE, sizeof(unsigned long),
+ GFP_KERNEL);
+ if (!pfns)
+ return NULL;
+
+ for (i = 0; i < size / HV_HYP_PAGE_SIZE; i++)
+ pfns[i] = virt_to_hvpfn(buf + i * HV_HYP_PAGE_SIZE)
+ + (ms_hyperv.shared_gpa_boundary >> HV_HYP_PAGE_SHIFT);
+
+ vaddr = vmap_pfn(pfns, size / HV_HYP_PAGE_SIZE, PAGE_KERNEL_IO);
+ kfree(pfns);
+
+ return vaddr;
+}
+
static int netvsc_init_buf(struct hv_device *device,
struct netvsc_device *net_device,
const struct netvsc_device_info *device_info)
@@ -340,6 +374,7 @@ 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;
@@ -375,6 +410,15 @@ static int netvsc_init_buf(struct hv_device *device,
goto cleanup;
}

+ if (hv_isolation_type_snp()) {
+ vaddr = netvsc_remap_buf(net_device->recv_buf, buf_size);
+ if (!vaddr)
+ 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));
@@ -477,6 +521,15 @@ static int netvsc_init_buf(struct hv_device *device,
goto cleanup;
}

+ if (hv_isolation_type_snp()) {
+ vaddr = netvsc_remap_buf(net_device->send_buf, buf_size);
+ if (!vaddr)
+ 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));
@@ -767,7 +820,7 @@ 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;
@@ -783,6 +836,7 @@ 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);
}

@@ -947,6 +1001,82 @@ 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 and so not
+ * use dma_map_sg() here.
+ */
+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;
+ }
+
+ packet->dma_range[i].dma = dma;
+ packet->dma_range[i].mapping_size = len;
+ pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT;
+ pb[i].offset = offset_in_hvpage(dma);
+ pb[i].len = len;
+ }
+
+ return 0;
+}
+
static inline int netvsc_send_pkt(
struct hv_device *device,
struct hv_netvsc_packet *packet,
@@ -987,14 +1117,22 @@ 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)
+ return ret;
+
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),
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index f6c9c2a670f9..448fcc325ed7 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -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,
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index cb4695c893a6..2d4cf1ef4062 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1617,6 +1617,11 @@ 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,
--
2.25.1