Re: [Qemu-devel] [PATCH 5/8] ipmi: add ACPI power and GUID commands

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Jan 17, 2016 at 02:04:32PM +0200, Marcel Apfelbaum wrote:
> On 01/05/2016 07:29 PM, Cédric Le Goater wrote:
> >Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
> >---
> >  hw/ipmi/ipmi_bmc_sim.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 55 insertions(+)
> >
> >diff --git a/hw/ipmi/ipmi_bmc_sim.c b/hw/ipmi/ipmi_bmc_sim.c
> >index 60586a67104e..c3a06d0ac7e4 100644
> >--- a/hw/ipmi/ipmi_bmc_sim.c
> >+++ b/hw/ipmi/ipmi_bmc_sim.c
> >@@ -25,6 +25,7 @@
> >  #include <stdio.h>
> >  #include <string.h>
> >  #include <stdint.h>
> >+#include "sysemu/sysemu.h"
> >  #include "qemu/timer.h"
> >  #include "hw/ipmi/ipmi.h"
> >  #include "qemu/error-report.h"
> >@@ -54,6 +55,9 @@
> >  #define IPMI_CMD_GET_DEVICE_ID            0x01
> >  #define IPMI_CMD_COLD_RESET               0x02
> >  #define IPMI_CMD_WARM_RESET               0x03
> >+#define IPMI_CMD_SET_POWER_STATE          0x06
> >+#define IPMI_CMD_GET_POWER_STATE          0x07
> >+#define IPMI_CMD_GET_DEVICE_GUID          0x08
> >  #define IPMI_CMD_RESET_WATCHDOG_TIMER     0x22
> >  #define IPMI_CMD_SET_WATCHDOG_TIMER       0x24
> >  #define IPMI_CMD_GET_WATCHDOG_TIMER       0x25
> >@@ -215,6 +219,9 @@ struct IPMIBmcSim {
> >
> >      uint8_t restart_cause;
> >
> >+    uint8_t power_state[2];
> >+    uint8_t uuid[16];
> >+
> >      IPMISel sel;
> >      IPMISdr sdr;
> >      IPMIFru fru;
> >@@ -842,6 +849,42 @@ static void warm_reset(IPMIBmcSim *ibs,
> >          k->reset(s, false);
> >      }
> >  }
> >+static void set_power_state(IPMIBmcSim *ibs,
> >+                          uint8_t *cmd, unsigned int cmd_len,
> >+                          uint8_t *rsp, unsigned int *rsp_len,
> >+                          unsigned int max_rsp_len)
> >+{
> >+    IPMI_CHECK_CMD_LEN(4);
> >+    ibs->power_state[0] = cmd[2];
> >+    ibs->power_state[1] = cmd[3];
> >+ out:
> >+    return;
> 
> 
> Hi,
> 
> I am sorry for my late comment, but I find a little strange the use of
> the "out" label here.
> I understand this is because of its usage in IPMI_*  macros, but
> I looked into every usage(I hope I didn't miss anything) and the code
> simply returns.
> Also the correlation between those macros is a little odd.
> 
> Thanks,
> Marcel


Yes - these macros with goto out are confusing.

Please rewrite them to return bool, and put
goto out in the caller.



> 
> >+}
> >+
> >+static void get_power_state(IPMIBmcSim *ibs,
> >+                          uint8_t *cmd, unsigned int cmd_len,
> >+                          uint8_t *rsp, unsigned int *rsp_len,
> >+                          unsigned int max_rsp_len)
> >+{
> >+    IPMI_ADD_RSP_DATA(ibs->power_state[0]);
> >+    IPMI_ADD_RSP_DATA(ibs->power_state[1]);
> >+ out:
> >+    return;
> >+}
> >+
> >+static void get_device_guid(IPMIBmcSim *ibs,
> >+                          uint8_t *cmd, unsigned int cmd_len,
> >+                          uint8_t *rsp, unsigned int *rsp_len,
> >+                          unsigned int max_rsp_len)
> >+{
> >+    unsigned int i;
> >+
> >+    for (i = 0; i < 16; i++) {
> >+        IPMI_ADD_RSP_DATA(ibs->uuid[i]);
> >+    }
> >+ out:
> >+    return;
> >+}
> >
> >  static void set_bmc_global_enables(IPMIBmcSim *ibs,
> >                                     uint8_t *cmd, unsigned int cmd_len,
> >@@ -1781,6 +1824,9 @@ static const IPMICmdHandler app_cmds[IPMI_NETFN_APP_MAXCMD] = {
> >      [IPMI_CMD_GET_DEVICE_ID] = get_device_id,
> >      [IPMI_CMD_COLD_RESET] = cold_reset,
> >      [IPMI_CMD_WARM_RESET] = warm_reset,
> >+    [IPMI_CMD_SET_POWER_STATE] = set_power_state,
> >+    [IPMI_CMD_GET_POWER_STATE] = get_power_state,
> >+    [IPMI_CMD_GET_DEVICE_GUID] = get_device_guid,
> >      [IPMI_CMD_SET_BMC_GLOBAL_ENABLES] = set_bmc_global_enables,
> >      [IPMI_CMD_GET_BMC_GLOBAL_ENABLES] = get_bmc_global_enables,
> >      [IPMI_CMD_CLR_MSG_FLAGS] = clr_msg_flags,
> >@@ -1907,6 +1953,15 @@ static void ipmi_sim_init(Object *obj)
> >          i += len;
> >      }
> >
> >+    ibs->power_state[0] = 0;
> >+    ibs->power_state[1] = 0;
> >+
> >+    if (qemu_uuid_set) {
> >+        memcpy(&ibs->uuid, qemu_uuid, 16);
> >+    } else {
> >+        memset(&ibs->uuid, 0, 16);
> >+    }
> >+
> >      ipmi_init_sensors_from_sdrs(ibs);
> >      register_cmds(ibs);
> >
> >