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-rw-r--r--arch/x86/hyperv/hv_init.c14
-rw-r--r--arch/x86/hyperv/ivm.c28
-rw-r--r--arch/x86/hyperv/mmu.c19
-rw-r--r--arch/x86/include/asm/mshyperv.h2
-rw-r--r--arch/x86/kernel/cc_platform.c8
-rw-r--r--arch/x86/kernel/cpu/mshyperv.c15
-rw-r--r--drivers/hv/channel_mgmt.c2
-rw-r--r--drivers/hv/hv_common.c15
-rw-r--r--drivers/hv/vmbus_drv.c4
-rw-r--r--drivers/net/hyperv/hyperv_net.h5
-rw-r--r--drivers/net/hyperv/netvsc.c136
-rw-r--r--drivers/net/hyperv/netvsc_drv.c1
-rw-r--r--drivers/net/hyperv/rndis_filter.c2
-rw-r--r--drivers/scsi/storvsc_drv.c54
-rw-r--r--include/asm-generic/mshyperv.h6
-rw-r--r--include/linux/hyperv.h6
-rw-r--r--include/linux/swiotlb.h6
-rw-r--r--kernel/dma/swiotlb.c50
18 files changed, 328 insertions, 45 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 96eb7db31c8e..8b392b6b7b93 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -28,6 +28,7 @@
#include <linux/syscore_ops.h>
#include <clocksource/hyperv_timer.h>
#include <linux/highmem.h>
+#include <linux/swiotlb.h>
int hyperv_init_cpuhp;
u64 hv_current_partition_id = ~0ull;
@@ -36,7 +37,7 @@ EXPORT_SYMBOL_GPL(hv_current_partition_id);
void *hv_hypercall_pg;
EXPORT_SYMBOL_GPL(hv_hypercall_pg);
-union hv_ghcb __percpu **hv_ghcb_pg;
+union hv_ghcb * __percpu *hv_ghcb_pg;
/* Storage to save the hypercall page temporarily for hibernation */
static void *hv_hypercall_pg_saved;
@@ -498,6 +499,17 @@ void __init hyperv_init(void)
/* Query the VMs extended capability once, so that it can be cached. */
hv_query_ext_cap(0);
+
+#ifdef CONFIG_SWIOTLB
+ /*
+ * Swiotlb bounce buffer needs to be mapped in extra address
+ * space. Map function doesn't work in the early place and so
+ * call swiotlb_update_mem_attributes() here.
+ */
+ if (hv_is_isolation_supported())
+ swiotlb_update_mem_attributes();
+#endif
+
return;
clean_guest_os_id:
diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
index 69c7a57f3307..2b994117581e 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 / 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);
+}
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index bd13736d0c05..0ad2378fe6ad 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -68,15 +68,6 @@ static void hyperv_flush_tlb_multi(const struct cpumask *cpus,
local_irq_save(flags);
- /*
- * Only check the mask _after_ interrupt has been disabled to avoid the
- * mask changing under our feet.
- */
- if (cpumask_empty(cpus)) {
- local_irq_restore(flags);
- return;
- }
-
flush_pcpu = (struct hv_tlb_flush **)
this_cpu_ptr(hyperv_pcpu_input_arg);
@@ -115,7 +106,9 @@ static void hyperv_flush_tlb_multi(const struct cpumask *cpus,
* must. We will also check all VP numbers when walking the
* supplied CPU set to remain correct in all cases.
*/
- if (hv_cpu_number_to_vp_number(cpumask_last(cpus)) >= 64)
+ cpu = cpumask_last(cpus);
+
+ if (cpu < nr_cpumask_bits && hv_cpu_number_to_vp_number(cpu) >= 64)
goto do_ex_hypercall;
for_each_cpu(cpu, cpus) {
@@ -131,6 +124,12 @@ static void hyperv_flush_tlb_multi(const struct cpumask *cpus,
__set_bit(vcpu, (unsigned long *)
&flush->processor_mask);
}
+
+ /* nothing to flush if 'processor_mask' ends up being empty */
+ if (!flush->processor_mask) {
+ local_irq_restore(flags);
+ return;
+ }
}
/*
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index a1c3dceff8eb..a82f603d4312 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -30,7 +30,7 @@ extern void *hv_hypercall_pg;
extern u64 hv_current_partition_id;
-extern union hv_ghcb __percpu **hv_ghcb_pg;
+extern union hv_ghcb * __percpu *hv_ghcb_pg;
int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c
index 8a25b1c0d480..6a6ffcd978f6 100644
--- a/arch/x86/kernel/cc_platform.c
+++ b/arch/x86/kernel/cc_platform.c
@@ -11,6 +11,7 @@
#include <linux/cc_platform.h>
#include <linux/mem_encrypt.h>
+#include <asm/mshyperv.h>
#include <asm/processor.h>
static bool __maybe_unused intel_cc_platform_has(enum cc_attr attr)
@@ -66,12 +67,19 @@ static bool amd_cc_platform_has(enum cc_attr attr)
#endif
}
+static bool hyperv_cc_platform_has(enum cc_attr attr)
+{
+ return attr == CC_ATTR_GUEST_MEM_ENCRYPT;
+}
bool cc_platform_has(enum cc_attr attr)
{
if (sme_me_mask)
return amd_cc_platform_has(attr);
+ if (hv_is_isolation_supported())
+ return hyperv_cc_platform_has(attr);
+
return false;
}
EXPORT_SYMBOL_GPL(cc_platform_has);
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 2a0f83678911..5a99f993e639 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -18,6 +18,7 @@
#include <linux/kexec.h>
#include <linux/i8253.h>
#include <linux/random.h>
+#include <linux/swiotlb.h>
#include <asm/processor.h>
#include <asm/hypervisor.h>
#include <asm/hyperv-tlfs.h>
@@ -329,8 +330,20 @@ static void __init ms_hyperv_init_platform(void)
pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n",
ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b);
- if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP)
+ if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) {
static_branch_enable(&isolation_type_snp);
+#ifdef CONFIG_SWIOTLB
+ swiotlb_unencrypted_base = ms_hyperv.shared_gpa_boundary;
+#endif
+ }
+
+#ifdef CONFIG_SWIOTLB
+ /*
+ * Enable swiotlb force mode in Isolation VM to
+ * use swiotlb bounce buffer for dma transaction.
+ */
+ swiotlb_force = SWIOTLB_FORCE;
+#endif
}
if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) {
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 2829575fd9b7..60375879612f 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -1554,7 +1554,7 @@ int vmbus_request_offers(void)
struct vmbus_channel_msginfo *msginfo;
int ret;
- msginfo = kmalloc(sizeof(*msginfo) +
+ msginfo = kzalloc(sizeof(*msginfo) +
sizeof(struct vmbus_channel_message_header),
GFP_KERNEL);
if (!msginfo)
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 7be173a99f27..181d16bbf49d 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -44,10 +44,10 @@ EXPORT_SYMBOL_GPL(hv_vp_index);
u32 hv_max_vp_index;
EXPORT_SYMBOL_GPL(hv_max_vp_index);
-void __percpu **hyperv_pcpu_input_arg;
+void * __percpu *hyperv_pcpu_input_arg;
EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg);
-void __percpu **hyperv_pcpu_output_arg;
+void * __percpu *hyperv_pcpu_output_arg;
EXPORT_SYMBOL_GPL(hyperv_pcpu_output_arg);
/*
@@ -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/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 7ae04ccb1043..17bf55fe3169 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -33,6 +33,7 @@
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/syscore_ops.h>
+#include <linux/dma-map-ops.h>
#include <clocksource/hyperv_timer.h>
#include "hyperv_vmbus.h"
@@ -2078,6 +2079,7 @@ struct hv_device *vmbus_device_create(const guid_t *type,
return child_device_obj;
}
+static u64 vmbus_dma_mask = DMA_BIT_MASK(64);
/*
* vmbus_device_register - Register the child device
*/
@@ -2118,6 +2120,8 @@ int vmbus_device_register(struct hv_device *child_device_obj)
}
hv_debug_add_dev_dir(child_device_obj);
+ child_device_obj->device.dma_mask = &vmbus_dma_mask;
+ child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
return 0;
err_kset_unregister:
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 5086cd07d1ed..afa81a9480cc 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);
+ }
+
bitmap_free(nvdev->send_section_map);
for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
@@ -337,6 +350,7 @@ static int netvsc_init_buf(struct hv_device *device,
struct nvsp_message *init_packet;
unsigned int buf_size;
int i, ret = 0;
+ void *vaddr;
/* Get receive buffer area. */
buf_size = device_info->recv_sections * device_info->recv_section_size;
@@ -372,6 +386,17 @@ 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));
@@ -475,6 +500,17 @@ 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));
@@ -764,7 +800,7 @@ 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;
@@ -780,6 +816,7 @@ 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);
}
@@ -944,6 +981,88 @@ 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,
@@ -984,14 +1103,24 @@ 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),
@@ -999,6 +1128,7 @@ 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 efa963b7af54..3646469433b1 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2516,6 +2516,7 @@ 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;
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/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 20595c0ba0ae..9a0bba5a51a7 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -21,6 +21,8 @@
#include <linux/device.h>
#include <linux/hyperv.h>
#include <linux/blkdev.h>
+#include <linux/dma-mapping.h>
+
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
@@ -1336,6 +1338,7 @@ static void storvsc_on_channel_callback(void *context)
continue;
}
request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd);
+ scsi_dma_unmap(scmnd);
}
storvsc_on_receive(stor_device, packet, request);
@@ -1749,9 +1752,7 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
struct hv_host_device *host_dev = shost_priv(host);
struct hv_device *dev = host_dev->dev;
struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
- int i;
struct scatterlist *sgl;
- unsigned int sg_count;
struct vmscsi_request *vm_srb;
struct vmbus_packet_mpb_array *payload;
u32 payload_sz;
@@ -1824,17 +1825,17 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
memcpy(vm_srb->cdb, scmnd->cmnd, vm_srb->cdb_length);
sgl = (struct scatterlist *)scsi_sglist(scmnd);
- sg_count = scsi_sg_count(scmnd);
length = scsi_bufflen(scmnd);
payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
payload_sz = sizeof(cmd_request->mpb);
- if (sg_count) {
- unsigned int hvpgoff, hvpfns_to_add;
+ if (scsi_sg_count(scmnd)) {
unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset);
unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length);
- u64 hvpfn;
+ struct scatterlist *sg;
+ unsigned long hvpfn, hvpfns_to_add;
+ int j, i = 0, sg_count;
if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
@@ -1848,21 +1849,24 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
payload->range.len = length;
payload->range.offset = offset_in_hvpg;
+ sg_count = scsi_dma_map(scmnd);
+ if (sg_count < 0) {
+ ret = SCSI_MLQUEUE_DEVICE_BUSY;
+ goto err_free_payload;
+ }
- for (i = 0; sgl != NULL; sgl = sg_next(sgl)) {
+ for_each_sg(sgl, sg, sg_count, j) {
/*
- * Init values for the current sgl entry. hvpgoff
- * and hvpfns_to_add are in units of Hyper-V size
- * pages. Handling the PAGE_SIZE != HV_HYP_PAGE_SIZE
- * case also handles values of sgl->offset that are
- * larger than PAGE_SIZE. Such offsets are handled
- * even on other than the first sgl entry, provided
- * they are a multiple of PAGE_SIZE.
+ * Init values for the current sgl entry. hvpfns_to_add
+ * is in units of Hyper-V size pages. Handling the
+ * PAGE_SIZE != HV_HYP_PAGE_SIZE case also handles
+ * values of sgl->offset that are larger than PAGE_SIZE.
+ * Such offsets are handled even on other than the first
+ * sgl entry, provided they are a multiple of PAGE_SIZE.
*/
- hvpgoff = HVPFN_DOWN(sgl->offset);
- hvpfn = page_to_hvpfn(sg_page(sgl)) + hvpgoff;
- hvpfns_to_add = HVPFN_UP(sgl->offset + sgl->length) -
- hvpgoff;
+ hvpfn = HVPFN_DOWN(sg_dma_address(sg));
+ hvpfns_to_add = HVPFN_UP(sg_dma_address(sg) +
+ sg_dma_len(sg)) - hvpfn;
/*
* Fill the next portion of the PFN array with
@@ -1872,7 +1876,7 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
* the PFN array is filled.
*/
while (hvpfns_to_add--)
- payload->range.pfn_array[i++] = hvpfn++;
+ payload->range.pfn_array[i++] = hvpfn++;
}
}
@@ -1884,13 +1888,18 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
put_cpu();
if (ret == -EAGAIN) {
- if (payload_sz > sizeof(cmd_request->mpb))
- kfree(payload);
/* no more space */
- return SCSI_MLQUEUE_DEVICE_BUSY;
+ ret = SCSI_MLQUEUE_DEVICE_BUSY;
+ goto err_free_payload;
}
return 0;
+
+err_free_payload:
+ if (payload_sz > sizeof(cmd_request->mpb))
+ kfree(payload);
+
+ return ret;
}
static struct scsi_host_template scsi_driver = {
@@ -2016,6 +2025,7 @@ static int storvsc_probe(struct hv_device *device,
stor_device->vmscsi_size_delta = sizeof(struct vmscsi_win8_extension);
spin_lock_init(&stor_device->lock);
hv_set_drvdata(device, stor_device);
+ dma_set_min_align_mask(&device->device, HV_HYP_PAGE_SIZE - 1);
stor_device->port_number = host->host_no;
ret = storvsc_connect_to_vsp(device, storvsc_ringbuffer_size, is_fc);
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 3e2248ac328e..c08758b6b364 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -49,8 +49,8 @@ struct ms_hyperv_info {
};
extern struct ms_hyperv_info ms_hyperv;
-extern void __percpu **hyperv_pcpu_input_arg;
-extern void __percpu **hyperv_pcpu_output_arg;
+extern void * __percpu *hyperv_pcpu_input_arg;
+extern void * __percpu *hyperv_pcpu_output_arg;
extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
@@ -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 b823311eac79..f565a8938836 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1261,6 +1261,7 @@ struct hv_device {
struct vmbus_channel *channel;
struct kset *channels_kset;
+ struct device_dma_parameters dma_parms;
/* place holder to keep track of the dir for hv device in debugfs */
struct dentry *debug_dir;
@@ -1583,6 +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,
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 569272871375..f6c3638255d5 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -73,6 +73,9 @@ extern enum swiotlb_force swiotlb_force;
* @end: The end address of the swiotlb memory pool. Used to do a quick
* range check to see if the memory was in fact allocated by this
* API.
+ * @vaddr: The vaddr of the swiotlb memory pool. The swiotlb memory pool
+ * may be remapped in the memory encrypted case and store virtual
+ * address for bounce buffer operation.
* @nslabs: The number of IO TLB blocks (in groups of 64) between @start and
* @end. For default swiotlb, this is command line adjustable via
* setup_io_tlb_npages.
@@ -92,6 +95,7 @@ extern enum swiotlb_force swiotlb_force;
struct io_tlb_mem {
phys_addr_t start;
phys_addr_t end;
+ void *vaddr;
unsigned long nslabs;
unsigned long used;
unsigned int index;
@@ -186,4 +190,6 @@ static inline bool is_swiotlb_for_alloc(struct device *dev)
}
#endif /* CONFIG_DMA_RESTRICTED_POOL */
+extern phys_addr_t swiotlb_unencrypted_base;
+
#endif /* __LINUX_SWIOTLB_H */
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 8e840fbbed7c..f1e7ea160b43 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -50,6 +50,7 @@
#include <asm/io.h>
#include <asm/dma.h>
+#include <linux/io.h>
#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/iommu-helper.h>
@@ -72,6 +73,8 @@ enum swiotlb_force swiotlb_force;
struct io_tlb_mem io_tlb_default_mem;
+phys_addr_t swiotlb_unencrypted_base;
+
/*
* Max segment that we can provide which (if pages are contingous) will
* not be bounced (unless SWIOTLB_FORCE is set).
@@ -156,6 +159,34 @@ static inline unsigned long nr_slots(u64 val)
}
/*
+ * Remap swioltb memory in the unencrypted physical address space
+ * when swiotlb_unencrypted_base is set. (e.g. for Hyper-V AMD SEV-SNP
+ * Isolation VMs).
+ */
+#ifdef CONFIG_HAS_IOMEM
+static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
+{
+ void *vaddr = NULL;
+
+ if (swiotlb_unencrypted_base) {
+ phys_addr_t paddr = mem->start + swiotlb_unencrypted_base;
+
+ vaddr = memremap(paddr, bytes, MEMREMAP_WB);
+ if (!vaddr)
+ pr_err("Failed to map the unencrypted memory %pa size %lx.\n",
+ &paddr, bytes);
+ }
+
+ return vaddr;
+}
+#else
+static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
+{
+ return NULL;
+}
+#endif
+
+/*
* Early SWIOTLB allocation may be too early to allow an architecture to
* perform the desired operations. This function allows the architecture to
* call SWIOTLB when the operations are possible. It needs to be called
@@ -172,7 +203,12 @@ void __init swiotlb_update_mem_attributes(void)
vaddr = phys_to_virt(mem->start);
bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
- memset(vaddr, 0, bytes);
+
+ mem->vaddr = swiotlb_mem_remap(mem, bytes);
+ if (!mem->vaddr)
+ mem->vaddr = vaddr;
+
+ memset(mem->vaddr, 0, bytes);
}
static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
@@ -196,7 +232,17 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
mem->slots[i].alloc_size = 0;
}
+
+ /*
+ * If swiotlb_unencrypted_base is set, the bounce buffer memory will
+ * be remapped and cleared in swiotlb_update_mem_attributes.
+ */
+ if (swiotlb_unencrypted_base)
+ return;
+
memset(vaddr, 0, bytes);
+ mem->vaddr = vaddr;
+ return;
}
int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
@@ -371,7 +417,7 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
phys_addr_t orig_addr = mem->slots[index].orig_addr;
size_t alloc_size = mem->slots[index].alloc_size;
unsigned long pfn = PFN_DOWN(orig_addr);
- unsigned char *vaddr = phys_to_virt(tlb_addr);
+ unsigned char *vaddr = mem->vaddr + tlb_addr - mem->start;
unsigned int tlb_offset, orig_addr_offset;
if (orig_addr == INVALID_PHYS_ADDR)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.