linux-kernel - Re: [v4 01/16] KVM: Extend struct pi

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Message-ID: <558A6E4E.90907@redhat.com>
Date:	Wed, 24 Jun 2015 10:46:06 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	"Wu, Feng" <feng.wu@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>
Subject: Re: [v4 01/16] KVM: Extend struct pi_desc for VT-d Posted-Interrupts



On 24/06/2015 07:42, Wu, Feng wrote:
> Do you mean we don't use bitfields at all, or the following format is
> acceptable, in which, we use bitfileds as less as possible?

>     union {
>         struct
>         {
>         u16 on     : 1,  /* bit 256 - Outstanding Notification */
>             sn     : 1,  /* bit 257 - Suppress Notification */
>             rsvd_1 : 14; /* bit 271:258 - Reserved */
>         u8  nv;          /* bit 279:272 - Notification Vector */
>         u8  rsvd_2;      /* bit 287:280 - Reserved */
>         u32 ndst;        /* bit 319:288 - Notification Destination */
>         };
>         u64 control;

This is okay.

Paolo
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