| Message ID | 20211201160257.1003912-6-ltykernel@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | x86/Hyper-V: Add Hyper-V Isolation VM support(Second part) | expand |
From: Tianyu Lan <ltykernel@gmail.com> Sent: Wednesday, December 1, 2021 8:03 AM > > 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 adress 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: Tianyu Lan <Tianyu.Lan@microsoft.com> > --- > Change since v2: > * Add hv_map/unmap_memory() to map/umap rx/tx ring buffer. > --- > arch/x86/hyperv/ivm.c | 28 ++++++ > drivers/hv/hv_common.c | 11 +++ > drivers/net/hyperv/hyperv_net.h | 5 ++ > drivers/net/hyperv/netvsc.c | 136 +++++++++++++++++++++++++++++- > drivers/net/hyperv/netvsc_drv.c | 1 + > drivers/net/hyperv/rndis_filter.c | 2 + > include/asm-generic/mshyperv.h | 2 + > include/linux/hyperv.h | 5 ++ > 8 files changed, 187 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c > index 69c7a57f3307..9f78d8f67ea3 100644 > --- a/arch/x86/hyperv/ivm.c > +++ b/arch/x86/hyperv/ivm.c > @@ -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 / HV_HYP_PAGE_SIZE, This should be just PAGE_SIZE, as this code is unrelated to communication with Hyper-V. > + sizeof(unsigned long), GFP_KERNEL); > + void *vaddr; > + int i; > + > + if (!pfns) > + return NULL; > + > + for (i = 0; i < size / PAGE_SIZE; i++) > + pfns[i] = virt_to_hvpfn(addr + i * PAGE_SIZE) + Same here: Use virt_to_pfn(). > + (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); > +} > diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c > index 7be173a99f27..3c5cb1f70319 100644 > --- a/drivers/hv/hv_common.c > +++ b/drivers/hv/hv_common.c > @@ -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); > diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h > index 315278a7cf88..cf69da0e296c 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 */ > 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 */ > diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c > index 396bc1c204e6..b7ade735a806 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) { > + 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. > + */ > +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); > > diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c > index 7e66ae1d2a59..17958533bf30 100644 > --- a/drivers/net/hyperv/netvsc_drv.c > +++ b/drivers/net/hyperv/netvsc_drv.c > @@ -2512,6 +2512,7 @@ static int netvsc_probe(struct hv_device *dev, > net->netdev_ops = &device_ops; > net->ethtool_ops = ðtool_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; > 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/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h > index 3e2248ac328e..94e73ba129c5 100644 > --- a/include/asm-generic/mshyperv.h > +++ b/include/asm-generic/mshyperv.h > @@ -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; } > diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h > index 74f5e92f91a0..b53cfc4163af 100644 > --- a/include/linux/hyperv.h > +++ b/include/linux/hyperv.h > @@ -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, > -- > 2.25.1
On 12/4/2021 2:59 AM, Michael Kelley (LINUX) wrote: >> + >> +/* >> + * 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 / HV_HYP_PAGE_SIZE, > This should be just PAGE_SIZE, as this code is unrelated to communication > with Hyper-V. > Yes, agree. Will update.
diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 69c7a57f3307..9f78d8f67ea3 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -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 / HV_HYP_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] = virt_to_hvpfn(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); +} diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 7be173a99f27..3c5cb1f70319 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -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); diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index 315278a7cf88..cf69da0e296c 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 */ 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 */ diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 396bc1c204e6..b7ade735a806 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) { + 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. + */ +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); diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 7e66ae1d2a59..17958533bf30 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2512,6 +2512,7 @@ static int netvsc_probe(struct hv_device *dev, net->netdev_ops = &device_ops; net->ethtool_ops = ðtool_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; 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/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 3e2248ac328e..94e73ba129c5 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -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; } diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 74f5e92f91a0..b53cfc4163af 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -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,