Re: [PATCH 3/4] xenconfig: add support for more timers

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On 01/20/2017 01:59 AM, Jim Fehlig wrote:
> Currently xenconfig only supports the hpet timer for HVM domains.
> Include support for tsc timer for both PV and HVM domains.
> 
> Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
> ---
>  src/xenconfig/xen_common.c | 87 ++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 77 insertions(+), 10 deletions(-)
> 
> diff --git a/src/xenconfig/xen_common.c b/src/xenconfig/xen_common.c
> index 7968d40..ad596d7 100644
> --- a/src/xenconfig/xen_common.c
> +++ b/src/xenconfig/xen_common.c
> @@ -490,6 +490,7 @@ xenParseCPUFeatures(virConfPtr conf,
>      unsigned long count = 0;
>      const char *str = NULL;
>      int val = 0;
> +    virDomainTimerDefPtr timer;
>  
>      if (xenConfigGetULong(conf, "vcpus", &count, 1) < 0)
>          return -1;
> @@ -514,6 +515,29 @@ xenParseCPUFeatures(virConfPtr conf,
>      if (str && (virBitmapParse(str, &def->cpumask, 4096) < 0))
>          return -1;
>  
> +    if (xenConfigGetString(conf, "tsc_mode", &str, NULL) < 0)
> +        return -1;
> +
> +    if (str) {
> +        if (VIR_EXPAND_N(def->clock.timers, def->clock.ntimers, 1) < 0 ||
> +            VIR_ALLOC(timer) < 0)
> +            return -1;
> +
> +        timer->name = VIR_DOMAIN_TIMER_NAME_TSC;
> +        timer->present = 1;
> +        timer->tickpolicy = -1;
> +        timer->mode = VIR_DOMAIN_TIMER_MODE_AUTO;
> +        timer->track = -1;
> +        if (STREQ_NULLABLE(str, "always_emulate"))
> +            timer->mode = VIR_DOMAIN_TIMER_MODE_EMULATE;
> +        else if (STREQ_NULLABLE(str, "native"))
> +            timer->mode = VIR_DOMAIN_TIMER_MODE_NATIVE;
> +        else if (STREQ_NULLABLE(str, "native_paravirt"))
> +            timer->mode = VIR_DOMAIN_TIMER_MODE_PARAVIRT;
> +
> +        def->clock.timers[def->clock.ntimers - 1] = timer;
> +    }
> +
>      if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
>          if (xenConfigGetBool(conf, "pae", &val, 1) < 0)
>              return -1;
> @@ -545,9 +569,7 @@ xenParseCPUFeatures(virConfPtr conf,
>              return -1;
>  
>          if (val != -1) {
> -            virDomainTimerDefPtr timer;
> -
> -            if (VIR_ALLOC_N(def->clock.timers, 1) < 0 ||
> +            if (VIR_EXPAND_N(def->clock.timers, def->clock.ntimers, 1) < 0 ||
>                  VIR_ALLOC(timer) < 0)
>                  return -1;
>  
> @@ -557,8 +579,7 @@ xenParseCPUFeatures(virConfPtr conf,
>              timer->mode = -1;
>              timer->track = -1;
>  
> -            def->clock.ntimers = 1;
> -            def->clock.timers[0] = timer;
> +            def->clock.timers[def->clock.ntimers - 1] = timer;
>          }
>      }
>  
> @@ -1584,8 +1605,9 @@ static int
>  xenFormatCPUFeatures(virConfPtr conf, virDomainDefPtr def)
>  {
>      size_t i;
> +    int hvm = def->os.type == VIR_DOMAIN_OSTYPE_HVM ? 1 : 0;
You can probably avoid the ternary expression style with turning this into a
bool and do !!(def->os.type == VIR_DOMAIN_OSTYPE_HVM) or simply just
(def->os.type == VIR_DOMAIN_OSTYPE_HVM). Or is it that libvirt style prefers
this way? Looking at the file it looks like the style you used above is kept
throughout this file.

>  
> -    if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
> +    if (hvm) {
>          if (xenConfigSetInt(conf, "pae",
>                              (def->features[VIR_DOMAIN_FEATURE_PAE] ==
>                              VIR_TRISTATE_SWITCH_ON) ? 1 : 0) < 0)
> @@ -1610,12 +1632,57 @@ xenFormatCPUFeatures(virConfPtr conf, virDomainDefPtr def)
>                              (def->features[VIR_DOMAIN_FEATURE_VIRIDIAN] ==
>                               VIR_TRISTATE_SWITCH_ON) ? 1 : 0) < 0)
>              return -1;
> +    }
>  
> -        for (i = 0; i < def->clock.ntimers; i++) {
> -            if (def->clock.timers[i]->name == VIR_DOMAIN_TIMER_NAME_HPET &&
> -                def->clock.timers[i]->present != -1 &&
> -                xenConfigSetInt(conf, "hpet", def->clock.timers[i]->present) < 0)
> +    for (i = 0; i < def->clock.ntimers; i++) {
> +        switch ((virDomainTimerNameType) def->clock.timers[i]->name) {
> +        case VIR_DOMAIN_TIMER_NAME_TSC:
> +            switch (def->clock.timers[i]->mode) {
> +            case VIR_DOMAIN_TIMER_MODE_NATIVE:
> +                if (xenConfigSetString(conf, "tsc_mode", "native") < 0)
> +                    return -1;
> +                break;
> +            case VIR_DOMAIN_TIMER_MODE_PARAVIRT:
> +                if (xenConfigSetString(conf, "tsc_mode", "native_paravirt") < 0)
> +                    return -1;
> +                break;
> +            case VIR_DOMAIN_TIMER_MODE_EMULATE:
> +                if (xenConfigSetString(conf, "tsc_mode", "always_emulate") < 0)
> +                    return -1;
> +                break;
> +            default:
> +                if (xenConfigSetString(conf, "tsc_mode", "default") < 0)
> +                    return -1;
> +            }
> +            break;
> +
> +        case VIR_DOMAIN_TIMER_NAME_HPET:
> +            if (hvm) {
> +                int enable_hpet = def->clock.timers[i]->present == 0 ? 0 : 1;
Same here i.e. (def->clock.timers[i]->present != 0) ?

> +
> +                /* disable hpet if 'present' is 0, enable otherwise */
> +                if (xenConfigSetInt(conf, "hpet", enable_hpet) < 0)
> +                    return -1;
> +            } else {
> +                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> +                               _("unsupported timer type (name) '%s'"),
> +                               virDomainTimerNameTypeToString(def->clock.timers[i]->name));
>                  return -1;
> +            }
> +            break;
> +
> +        case VIR_DOMAIN_TIMER_NAME_PLATFORM:
> +        case VIR_DOMAIN_TIMER_NAME_KVMCLOCK:
> +        case VIR_DOMAIN_TIMER_NAME_HYPERVCLOCK:
> +        case VIR_DOMAIN_TIMER_NAME_RTC:
> +        case VIR_DOMAIN_TIMER_NAME_PIT:
> +            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> +                           _("unsupported timer type (name) '%s'"),
> +                           virDomainTimerNameTypeToString(def->clock.timers[i]->name));
> +            return -1;
> +
> +        case VIR_DOMAIN_TIMER_NAME_LAST:
> +            break;
>          }
>      }
>  
> 

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