linux-kernel - RE: [PATCH] x86/hyper-v: add "polling" bit to hv_synic

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Date:   Mon, 23 Dec 2019 14:41:03 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Wei Liu <wei.liu@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
CC:     "sashal@...nel.org" <sashal@...nel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] x86/hyper-v: add "polling" bit to hv_synic_sint

From: Wei Liu <wei.liu@...nel.org> Sent: Sunday, December 22, 2019 3:34 PM
> To: linux-hyperv@...r.kernel.org
> Cc: sashal@...nel.org; KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> x86@...nel.org; Michael Kelley <mikelley@...rosoft.com>; linux-kernel@...r.kernel.org;
> Wei Liu <wei.liu@...nel.org>
> Subject: [PATCH] x86/hyper-v: add "polling" bit to hv_synic_sint
> 
> That bit is documented in TLFS 5.0c as follows:
> 
>   Setting the polling bit will have the effect of unmasking an
>   interrupt source, except that an actual interrupt is not generated.
> 
> Signed-off-by: Wei Liu <wei.liu@...nel.org>
> ---
>  arch/x86/include/asm/hyperv-tlfs.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> index 5f10f7f2098d..92abc1e42bfc 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -809,7 +809,8 @@ union hv_synic_sint {
>  		u64 reserved1:8;
>  		u64 masked:1;
>  		u64 auto_eoi:1;
> -		u64 reserved2:46;
> +		u64 polling:1;
> +		u64 reserved2:45;
>  	} __packed;
>  };
> 
> --
> 2.20.1

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>