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path: root/drivers/hv/channel.c
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Diffstat (limited to 'drivers/hv/channel.c')
-rw-r--r--drivers/hv/channel.c176
1 files changed, 70 insertions, 106 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 56f7e06c673e..adbf674355b2 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -322,125 +322,89 @@ static int create_gpadl_header(enum hv_gpadl_type type, void *kbuffer,
pagecount = hv_gpadl_size(type, size) >> HV_HYP_PAGE_SHIFT;
- /* do we need a gpadl body msg */
pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
sizeof(struct vmbus_channel_gpadl_header) -
sizeof(struct gpa_range);
+ pfncount = umin(pagecount, pfnsize / sizeof(u64));
+
+ msgsize = sizeof(struct vmbus_channel_msginfo) +
+ sizeof(struct vmbus_channel_gpadl_header) +
+ sizeof(struct gpa_range) + pfncount * sizeof(u64);
+ msgheader = kzalloc(msgsize, GFP_KERNEL);
+ if (!msgheader)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&msgheader->submsglist);
+ msgheader->msgsize = msgsize;
+
+ gpadl_header = (struct vmbus_channel_gpadl_header *)
+ msgheader->msg;
+ gpadl_header->rangecount = 1;
+ gpadl_header->range_buflen = sizeof(struct gpa_range) +
+ pagecount * sizeof(u64);
+ gpadl_header->range[0].byte_offset = 0;
+ gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
+ for (i = 0; i < pfncount; i++)
+ gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
+ type, kbuffer, size, send_offset, i);
+ *msginfo = msgheader;
+
+ pfnsum = pfncount;
+ pfnleft = pagecount - pfncount;
+
+ /* how many pfns can we fit in a body message */
+ pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
+ sizeof(struct vmbus_channel_gpadl_body);
pfncount = pfnsize / sizeof(u64);
- if (pagecount > pfncount) {
- /* we need a gpadl body */
- /* fill in the header */
+ /*
+ * If pfnleft is zero, everything fits in the header and no body
+ * messages are needed
+ */
+ while (pfnleft) {
+ pfncurr = umin(pfncount, pfnleft);
msgsize = sizeof(struct vmbus_channel_msginfo) +
- sizeof(struct vmbus_channel_gpadl_header) +
- sizeof(struct gpa_range) + pfncount * sizeof(u64);
- msgheader = kzalloc(msgsize, GFP_KERNEL);
- if (!msgheader)
- goto nomem;
-
- INIT_LIST_HEAD(&msgheader->submsglist);
- msgheader->msgsize = msgsize;
-
- gpadl_header = (struct vmbus_channel_gpadl_header *)
- msgheader->msg;
- gpadl_header->rangecount = 1;
- gpadl_header->range_buflen = sizeof(struct gpa_range) +
- pagecount * sizeof(u64);
- gpadl_header->range[0].byte_offset = 0;
- gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
- for (i = 0; i < pfncount; i++)
- gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
- type, kbuffer, size, send_offset, i);
- *msginfo = msgheader;
-
- pfnsum = pfncount;
- pfnleft = pagecount - pfncount;
-
- /* how many pfns can we fit */
- pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
- sizeof(struct vmbus_channel_gpadl_body);
- pfncount = pfnsize / sizeof(u64);
-
- /* fill in the body */
- while (pfnleft) {
- if (pfnleft > pfncount)
- pfncurr = pfncount;
- else
- pfncurr = pfnleft;
-
- msgsize = sizeof(struct vmbus_channel_msginfo) +
- sizeof(struct vmbus_channel_gpadl_body) +
- pfncurr * sizeof(u64);
- msgbody = kzalloc(msgsize, GFP_KERNEL);
-
- if (!msgbody) {
- struct vmbus_channel_msginfo *pos = NULL;
- struct vmbus_channel_msginfo *tmp = NULL;
- /*
- * Free up all the allocated messages.
- */
- list_for_each_entry_safe(pos, tmp,
- &msgheader->submsglist,
- msglistentry) {
-
- list_del(&pos->msglistentry);
- kfree(pos);
- }
-
- goto nomem;
- }
-
- msgbody->msgsize = msgsize;
- gpadl_body =
- (struct vmbus_channel_gpadl_body *)msgbody->msg;
+ sizeof(struct vmbus_channel_gpadl_body) +
+ pfncurr * sizeof(u64);
+ msgbody = kzalloc(msgsize, GFP_KERNEL);
+ if (!msgbody) {
+ struct vmbus_channel_msginfo *pos = NULL;
+ struct vmbus_channel_msginfo *tmp = NULL;
/*
- * Gpadl is u32 and we are using a pointer which could
- * be 64-bit
- * This is governed by the guest/host protocol and
- * so the hypervisor guarantees that this is ok.
+ * Free up all the allocated messages.
*/
- for (i = 0; i < pfncurr; i++)
- gpadl_body->pfn[i] = hv_gpadl_hvpfn(type,
- kbuffer, size, send_offset, pfnsum + i);
-
- /* add to msg header */
- list_add_tail(&msgbody->msglistentry,
- &msgheader->submsglist);
- pfnsum += pfncurr;
- pfnleft -= pfncurr;
+ list_for_each_entry_safe(pos, tmp,
+ &msgheader->submsglist,
+ msglistentry) {
+
+ list_del(&pos->msglistentry);
+ kfree(pos);
+ }
+ kfree(msgheader);
+ return -ENOMEM;
}
- } else {
- /* everything fits in a header */
- msgsize = sizeof(struct vmbus_channel_msginfo) +
- sizeof(struct vmbus_channel_gpadl_header) +
- sizeof(struct gpa_range) + pagecount * sizeof(u64);
- msgheader = kzalloc(msgsize, GFP_KERNEL);
- if (msgheader == NULL)
- goto nomem;
-
- INIT_LIST_HEAD(&msgheader->submsglist);
- msgheader->msgsize = msgsize;
-
- gpadl_header = (struct vmbus_channel_gpadl_header *)
- msgheader->msg;
- gpadl_header->rangecount = 1;
- gpadl_header->range_buflen = sizeof(struct gpa_range) +
- pagecount * sizeof(u64);
- gpadl_header->range[0].byte_offset = 0;
- gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
- for (i = 0; i < pagecount; i++)
- gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
- type, kbuffer, size, send_offset, i);
-
- *msginfo = msgheader;
+
+ msgbody->msgsize = msgsize;
+ gpadl_body = (struct vmbus_channel_gpadl_body *)msgbody->msg;
+
+ /*
+ * Gpadl is u32 and we are using a pointer which could
+ * be 64-bit
+ * This is governed by the guest/host protocol and
+ * so the hypervisor guarantees that this is ok.
+ */
+ for (i = 0; i < pfncurr; i++)
+ gpadl_body->pfn[i] = hv_gpadl_hvpfn(type,
+ kbuffer, size, send_offset, pfnsum + i);
+
+ /* add to msg header */
+ list_add_tail(&msgbody->msglistentry, &msgheader->submsglist);
+ pfnsum += pfncurr;
+ pfnleft -= pfncurr;
}
return 0;
-nomem:
- kfree(msgheader);
- kfree(msgbody);
- return -ENOMEM;
}
/*
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-15 19:55:22 +0000