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RE: [PATCH 4/7] x86/hyperv: implement rep hypercalls

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> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@redhat.com]
> Sent: Friday, April 7, 2017 04:27
> To: devel@linuxdriverproject.org; x86@kernel.org
> Cc: linux-kernel@vger.kernel.org; KY Srinivasan <kys@microsoft.com>;
> Haiyang Zhang <haiyangz@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; Thomas Gleixner <tglx@linutronix.de>; Ingo
> Molnar <mingo@redhat.com>; H. Peter Anvin <hpa@zytor.com>; Steven
> Rostedt <rostedt@goodmis.org>; Jork Loeser <Jork.Loeser@microsoft.com>
> Subject: [PATCH 4/7] x86/hyperv: implement rep hypercalls
 
> diff --git a/arch/x86/include/asm/mshyperv.h
> b/arch/x86/include/asm/mshyperv.h index 9a5f58b..a2c996b 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -4,6 +4,7 @@
>  #include <linux/types.h>
>  #include <linux/interrupt.h>
>  #include <linux/clocksource.h>
> +#include <linux/nmi.h>
>  #include <asm/hyperv.h>
> 
>  /*
> @@ -253,6 +254,26 @@ static inline u64 hv_do_fast_hypercall8(u16 code,
> u64 input1)  #endif  }
> 
> +static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, void
> *input,
> +				      void *output)
> +{
> +	union hv_hypercall_input hc_input = { .code = code,
> +					      .rep_count = rep_count};

Is there a way to statically verify the re-count not to exceed 12 bits? Could a dynamic check be justified? Perhaps a function comment?

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[PATCH 0/7] Hyper-V: praravirtualized remote TLB flushing and hypercall improvements Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-07 13:30 +0200
  [PATCH 3/7] hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-07 13:30 +0200
  [PATCH 6/7] x86/hyper-v: use hypercall for remove TLB flush Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-07 13:30 +0200
    RE: [PATCH 6/7] x86/hyper-v: use hypercall for remove TLB flush Jork Loeser <Jork.Loeser@microsoft.com> - 2017-04-07 22:50 +0200
    RE: [PATCH 6/7] x86/hyper-v: use hypercall for remove TLB flush KY Srinivasan <kys@microsoft.com> - 2017-04-08 18:50 +0200
      Re: [PATCH 6/7] x86/hyper-v: use hypercall for remove TLB flush Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-10 16:50 +0200
  [PATCH 4/7] x86/hyperv: implement rep hypercalls Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-07 13:30 +0200
    RE: [PATCH 4/7] x86/hyperv: implement rep hypercalls Jork Loeser <Jork.Loeser@microsoft.com> - 2017-04-07 21:50 +0200
      Re: [PATCH 4/7] x86/hyperv: implement rep hypercalls Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-10 11:10 +0200
  [PATCH 5/7] hyper-v: globalize vp_index Vitaly Kuznetsov <vkuznets@redhat.com> - 2017-04-07 13:30 +0200
    RE: [PATCH 5/7] hyper-v: globalize vp_index KY Srinivasan <kys@microsoft.com> - 2017-04-08 17:50 +0200
  RE: [PATCH 0/7] Hyper-V: praravirtualized remote TLB flushing and  hypercall improvements KY Srinivasan <kys@microsoft.com> - 2017-04-08 17:00 +0200

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