Re: [Qemu-devel] [PATCH v3 09/10] ipmi: use a file to load SDRs

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

On Thu, Mar 10, 2016 at 03:04:02PM +0100, Cédric Le Goater wrote:
> The IPMI BMC simulator populates the sdr/sensor tables with a minimal
> set of entries (Watchdog). But some qemu platforms might want to use
> extra entries for their custom needs.
> 
> This patch modifies slighty the initializing routine to take into
> account a larger set read from a file. The name of the file to use is
> defined through a new 'sdr' property of the simulator device.
> 
> Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
> Acked-by: Corey Minyard <cminyard@mvista.com>
> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>

Same thing - I prefer deferring this until 2.7
as loading files needs to be done carefully.

> ---
> 
> Changes since v1:
> 
>  - log an error if file does not exist.
>  - change property name to 'sdrfile'
>  - add documentation of new properties
>  
>  hw/ipmi/ipmi_bmc_sim.c |   23 +++++++++++++++++++++--
>  qemu-options.hx        |   11 ++++++++++-
>  2 files changed, 31 insertions(+), 3 deletions(-)
> 
> Index: qemu-powernv.git/hw/ipmi/ipmi_bmc_sim.c
> ===================================================================
> --- qemu-powernv.git.orig/hw/ipmi/ipmi_bmc_sim.c
> +++ qemu-powernv.git/hw/ipmi/ipmi_bmc_sim.c
> @@ -27,6 +27,7 @@
>  #include "qemu/timer.h"
>  #include "hw/ipmi/ipmi.h"
>  #include "qemu/error-report.h"
> +#include "hw/loader.h"
>  
>  #define IPMI_NETFN_CHASSIS            0x00
>  
> @@ -213,6 +214,7 @@ struct IPMIBmcSim {
>      IPMISel sel;
>      IPMISdr sdr;
>      IPMISensor sensors[MAX_SENSORS];
> +    char *sdr_filename;
>  
>      /* Odd netfns are for responses, so we only need the even ones. */
>      const IPMINetfn *netfns[MAX_NETFNS / 2];
> @@ -1701,22 +1703,33 @@ static void ipmi_sdr_init(IPMIBmcSim *ib
>  
>      sdrs_size = sizeof(init_sdrs);
>      sdrs = init_sdrs;
> +    if (ibs->sdr_filename &&
> +        !g_file_get_contents(ibs->sdr_filename, (gchar **) &sdrs, &sdrs_size,
> +                             NULL)) {
> +        error_report("failed to load sdr file '%s'", ibs->sdr_filename);
> +        sdrs_size = sizeof(init_sdrs);
> +        sdrs = init_sdrs;
> +    }
>  
>      for (i = 0; i < sdrs_size; i += len) {
>          struct ipmi_sdr_header *sdrh;
>  
>          if (i + IPMI_SDR_HEADER_SIZE > sdrs_size) {
>              error_report("Problem with recid 0x%4.4x", i);
> -            return;
> +            break;
>          }
>          sdrh = (struct ipmi_sdr_header *) &sdrs[i];
>          len = ipmi_sdr_length(sdrh);
>          if (i + len > sdrs_size) {
>              error_report("Problem with recid 0x%4.4x", i);
> -            return;
> +            break;
>          }
>          sdr_add_entry(ibs, sdrh, len, NULL);
>      }
> +
> +    if (sdrs != init_sdrs) {
> +        g_free(sdrs);
> +    }
>  }
>  
>  static const VMStateDescription vmstate_ipmi_sim = {
> @@ -1786,12 +1799,18 @@ static void ipmi_sim_realize(DeviceState
>      vmstate_register(NULL, 0, &vmstate_ipmi_sim, ibs);
>  }
>  
> +static Property ipmi_sim_properties[] = {
> +    DEFINE_PROP_STRING("sdrfile", IPMIBmcSim, sdr_filename),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
>  static void ipmi_sim_class_init(ObjectClass *oc, void *data)
>  {
>      DeviceClass *dc = DEVICE_CLASS(oc);
>      IPMIBmcClass *bk = IPMI_BMC_CLASS(oc);
>  
>      dc->realize = ipmi_sim_realize;
> +    dc->props = ipmi_sim_properties;
>      bk->handle_command = ipmi_sim_handle_command;
>  }
>  
> Index: qemu-powernv.git/qemu-options.hx
> ===================================================================
> --- qemu-powernv.git.orig/qemu-options.hx
> +++ qemu-powernv.git/qemu-options.hx
> @@ -387,7 +387,7 @@ possible drivers and properties, use @co
>  @code{-device @var{driver},help}.
>  
>  Some drivers are:
> -@item -device ipmi-bmc-sim,id=@var{id}[,slave_addr=@var{val}]
> +@item -device ipmi-bmc-sim,id=@var{id}[,slave_addr=@var{val}][,sdrfile=@var{file}]
>  
>  Add an IPMI BMC.  This is a simulation of a hardware management
>  interface processor that normally sits on a system.  It provides
> @@ -399,6 +399,15 @@ This address is the BMC's address on the
>  controllers.  If you don't know what this means, it is safe to ignore
>  it.
>  
> +@table @option
> +@item bmc=@var{id}
> +The BMC to connect to, one of ipmi-bmc-sim or ipmi-bmc-extern above.
> +@item slave_addr=@var{val}
> +Define slave address to use for the BMC.  The default is 0x20.
> +@item sdrfile=@var{file}
> +file containing raw Sensor Data Records (SDR) data.  The default is none.
> +@end table
> +
>  @item -device ipmi-bmc-extern,id=@var{id},chardev=@var{id}[,slave_addr=@var{val}]
>  
>  Add a connection to an external IPMI BMC simulator.  Instead of