redonkable/alistair23-linux
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hv_utils: Support host-initiated restart request

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The hv_utils driver currently supports a "shutdown" operation initiated
from the Hyper-V host. Newer versions of Hyper-V also support a "restart"
operation. So add support for the updated protocol version that has
"restart" support, and perform a clean reboot when such a message is
received from Hyper-V.

To test the restart functionality, run this PowerShell command on the
Hyper-V host:

Restart-VM  <vmname>  -Type Reboot

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dexuan Cui 2020-01-25 21:49:42 -08:00 committed by Sasha Levin
parent 9fc3c01a1f
commit 3e9c72056e
1 changed files with 31 additions and 8 deletions
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39
drivers/hv/hv_util.c
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@ -24,6 +24,8 @@
#define SD_MAJOR 3
#define SD_MINOR 0
#define SD_MINOR_1 1
#define SD_VERSION_3_1 (SD_MAJOR << 16 | SD_MINOR_1)
#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
#define SD_MAJOR_1 1
@ -50,8 +52,9 @@ static int sd_srv_version;
static int ts_srv_version;
static int hb_srv_version;
#define SD_VER_COUNT 2
#define SD_VER_COUNT 3
static const int sd_versions[] = {
SD_VERSION_3_1,
SD_VERSION,
SD_VERSION_1
};
@ -118,17 +121,27 @@ static void perform_shutdown(struct work_struct *dummy)
orderly_poweroff(true);
}
static void perform_restart(struct work_struct *dummy)
{
orderly_reboot();
}
/*
* Perform the shutdown operation in a thread context.
*/
static DECLARE_WORK(shutdown_work, perform_shutdown);
/*
* Perform the restart operation in a thread context.
*/
static DECLARE_WORK(restart_work, perform_restart);
static void shutdown_onchannelcallback(void *context)
{
struct vmbus_channel *channel = context;
struct work_struct *work = NULL;
u32 recvlen;
u64 requestid;
bool execute_shutdown = false;
u8 *shut_txf_buf = util_shutdown.recv_buffer;
struct shutdown_msg_data *shutdown_msg;
@ -157,19 +170,29 @@ static void shutdown_onchannelcallback(void *context)
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
/*
* shutdown_msg->flags can be 0(shut down), 2(reboot),
* or 4(hibernate). It may bitwise-OR 1, which means
* performing the request by force. Linux always tries
* to perform the request by force.
*/
switch (shutdown_msg->flags) {
case 0:
case 1:
icmsghdrp->status = HV_S_OK;
execute_shutdown = true;
work = &shutdown_work;
pr_info("Shutdown request received -"
" graceful shutdown initiated\n");
break;
case 2:
case 3:
icmsghdrp->status = HV_S_OK;
work = &restart_work;
pr_info("Restart request received -"
" graceful restart initiated\n");
break;
default:
icmsghdrp->status = HV_E_FAIL;
execute_shutdown = false;
pr_info("Shutdown request received -"
" Invalid request\n");
break;
@ -184,8 +207,8 @@ static void shutdown_onchannelcallback(void *context)
VM_PKT_DATA_INBAND, 0);
}
if (execute_shutdown == true)
schedule_work(&shutdown_work);
if (work)
schedule_work(work);
}
/*