Re: [RFC PATCH 5/7] [hyper-v] hyper-v helper functions

[Alon Levy <alevy@redhat.com>]

On Sun, Oct 09, 2011 at 08:52:53PM +0200, Vadim Rozenfeld wrote:
> ---
>  hyperv.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
>  hyperv.h |    7 +++++++
>  2 files changed, 51 insertions(+), 0 deletions(-)
> 
> diff --git a/hyperv.c b/hyperv.c
> index a17f879..57915b9 100644
> --- a/hyperv.c
> +++ b/hyperv.c
> @@ -3,6 +3,10 @@
>  #include "qemu-option.h"
>  #include "qemu-config.h"
>  
> +static int hyperv_apic;
> +static int hyperv_wd;
> +static int hyperv_spinlock_attempts = HYPERV_SPINLOCK_NEVER_RETRY;
> +
>  void hyperv_init(void)
>  {
>      QemuOpts *opts = QTAILQ_FIRST(&qemu_hyperv_opts.head);
> @@ -10,6 +14,46 @@ void hyperv_init(void)
>      if (!opts) {
>          return;
>      }
> +
> +    hyperv_spinlock_attempts = qemu_opt_get_number(opts, "spinlock", 
> +                                                   HYPERV_SPINLOCK_NEVER_RETRY
> +                                                  );
> +    hyperv_wd = qemu_opt_get_bool(opts, "wd", 0);
> +    hyperv_apic = qemu_opt_get_bool(opts, "vapic", 0);
> +
> +}
> +
> +int hyperv_enabled(void)
> +{
> +    return hyperv_hypercall_available() | hyperv_relaxed_timing();
Shouldn't this be a logical or?

> +}
> +
> +int hyperv_hypercall_available(void)
> +{
> +    if (hyperv_apic ||
> +        (hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY)) {
> +      return 1;
> +    }
> +    return 0;
> +}
> +
> +int hyperv_relaxed_timing(void)
> +{
> +    return !hyperv_wd;
> +}
> +
> +int hyperv_apic_recommended(void)
> +{
> +#ifdef KVM_CAP_IRQCHIP
> +    return hyperv_apic;
> +#else
> +    return 0;
> +#endif
> +}
> +
> +int hyperv_spinlock_retries(void)
> +{
> +    return hyperv_spinlock_attempts;
>  }
>  
>  static void hyperv_initialize(void)
> diff --git a/hyperv.h b/hyperv.h
> index eaf974a..27d2e6e 100644
> --- a/hyperv.h
> +++ b/hyperv.h
> @@ -6,7 +6,14 @@
>  
>  #include <asm/hyperv.h>
>  
> +#define HYPERV_SPINLOCK_NEVER_RETRY             0xFFFFFFFF
> +
>  void hyperv_init(void);
> +int hyperv_enabled(void);
> +int hyperv_hypercall_available(void);
> +int hyperv_relaxed_timing(void);
> +int hyperv_apic_recommended(void);
> +int hyperv_spinlock_retries(void);
>  
>  #endif /* QEMU_HW_HYPERV_H */
>  
> -- 
> 1.7.4.4
> 
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