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Drivers: hv: vss: full handshake support

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Introduce VSS_OP_REGISTER1 to support kernel replying to the negotiation
message with its own version.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2015-04-11 18:07:57 -07:00 committed by Greg Kroah-Hartman
parent f5722b9bd4
commit cd8dc05485
3 changed files with 56 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
drivers/hv/hv_snapshot.c
View File

@ -59,6 +59,11 @@ static struct {
static void vss_respond_to_host(int error);
/*
* This state maintains the version number registered by the daemon.
*/
static int dm_reg_value;
static const char vss_devname[] = "vmbus/hv_vss";
static __u8 *recv_buffer;
static struct hvutil_transport *hvt;
@ -89,6 +94,29 @@ static void vss_timeout_func(struct work_struct *dummy)
hv_vss_onchannelcallback);
}
static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
{
u32 our_ver = VSS_OP_REGISTER1;
switch (vss_msg->vss_hdr.operation) {
case VSS_OP_REGISTER:
/* Daemon doesn't expect us to reply */
dm_reg_value = VSS_OP_REGISTER;
break;
case VSS_OP_REGISTER1:
/* Daemon expects us to reply with our own version*/
if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
return -EFAULT;
dm_reg_value = VSS_OP_REGISTER1;
break;
default:
return -EINVAL;
}
vss_transaction.state = HVUTIL_READY;
pr_info("VSS daemon registered\n");
return 0;
}
static int vss_on_msg(void *msg, int len)
{
struct hv_vss_msg *vss_msg = (struct hv_vss_msg *)msg;
@ -96,18 +124,15 @@ static int vss_on_msg(void *msg, int len)
if (len != sizeof(*vss_msg))
return -EINVAL;
/*
* Don't process registration messages if we're in the middle of
* a transaction processing.
*/
if (vss_transaction.state > HVUTIL_READY &&
vss_msg->vss_hdr.operation == VSS_OP_REGISTER)
return -EINVAL;
if (vss_transaction.state == HVUTIL_DEVICE_INIT &&
vss_msg->vss_hdr.operation == VSS_OP_REGISTER) {
pr_info("VSS daemon registered\n");
vss_transaction.state = HVUTIL_READY;
if (vss_msg->vss_hdr.operation == VSS_OP_REGISTER ||
vss_msg->vss_hdr.operation == VSS_OP_REGISTER1) {
/*
* Don't process registration messages if we're in the middle
* of a transaction processing.
*/
if (vss_transaction.state > HVUTIL_READY)
return -EINVAL;
return vss_handle_handshake(vss_msg);
} else if (vss_transaction.state == HVUTIL_USERSPACE_REQ) {
vss_transaction.state = HVUTIL_USERSPACE_RECV;
if (cancel_delayed_work_sync(&vss_timeout_work)) {

5
include/uapi/linux/hyperv.h
View File

@ -45,6 +45,11 @@
#define VSS_OP_REGISTER 128
/*
Daemon code with full handshake support.
*/
#define VSS_OP_REGISTER1 129
enum hv_vss_op {
VSS_OP_CREATE = 0,
VSS_OP_DELETE,

14
tools/hv/hv_vss_daemon.c
View File

@ -148,6 +148,8 @@ int main(int argc, char *argv[])
int op;
struct hv_vss_msg vss_msg[1];
int daemonize = 1, long_index = 0, opt;
int in_handshake = 1;
__u32 kernel_modver;
static struct option long_options[] = {
{"help", no_argument, 0, 'h' },
@ -211,6 +213,18 @@ int main(int argc, char *argv[])
len = read(vss_fd, vss_msg, sizeof(struct hv_vss_msg));
if (in_handshake) {
if (len != sizeof(kernel_modver)) {
syslog(LOG_ERR, "invalid version negotiation");
exit(EXIT_FAILURE);
}
kernel_modver = *(__u32 *)vss_msg;
in_handshake = 0;
syslog(LOG_INFO, "VSS: kernel module version: %d",
kernel_modver);
continue;
}
if (len != sizeof(struct hv_vss_msg)) {
syslog(LOG_ERR, "read failed; error:%d %s",
errno, strerror(errno));