From: Bob Liu <email@example.com> To: Ian Jackson <Ian.Jackson@eu.citrix.com> Cc: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, Paul.Durrant@citrix.com, David Vrabel <email@example.com>, firstname.lastname@example.org Subject: Re: [RFC PATCH] blkif.h: document scsi/0x12/0x83 node Date: Tue, 22 Mar 2016 20:55:30 +0800 [thread overview] Message-ID: <56F140C2.email@example.com> (raw) In-Reply-To: <firstname.lastname@example.org> On 03/17/2016 07:12 PM, Ian Jackson wrote: > David Vrabel writes ("Re: [Xen-devel] [RFC PATCH] blkif.h: document scsi/0x12/0x83 node"): >> On 16/03/16 13:59, Bob Liu wrote: >>> But we'd like to get the VPD information(of underlying storage device) also in Linux blkfront, even blkfront is not a SCSI device. >> >> Why does blkback/blkfront need to involved here? This is just some >> xenstore keys that can be written by the toolstack and directly read by >> the relevant application in the guest. > They want a more generic way because the application may run on all kinds of environment including baremetal. So they prefers to just call ioctl(SG_IO) against a storage device. > I'm getting rather a different picture here than at first. Previously > I thought you had some 3rd-party application, not under your control, > which expected to see this VPD data. > > But now I think that you're saying the application is under your own > control. I don't understand why synthetic VPD data is the best way to > give your application the information it needs. > > What is the application doing with this VPD data ? I mean, > which specific application functions, and how do they depend on the > VPD data ? > From the feedbacks I just got, they do *not* want the details to be in public. Anyway, I think this is not a block of this patch. In Windows PV block driver, we already use the same way to get the raw INQUIRY data. * The Windows PV block driver accepts ioctl(SG_IO). * Then it reads this /scsi/0x12/0x83 node. * Then return the raw INQURIY data back to ioctl. Since Linux guest also wants to do the same thing, let's making this mechanism to be a generic interface! I'll post a patch adding ioctl(SG_IO) support to xen-blkfront together with a updated version of this patch soon. Thanks, Bob _______________________________________________ Xen-devel mailing list Xenemail@example.com http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-03-22 12:55 UTC|newest] Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-03-16 3:09 Bob Liu 2016-03-16 7:16 ` Konrad Rzeszutek Wilk 2016-03-16 12:36 ` Ian Jackson 2016-03-16 13:59 ` Bob Liu 2016-03-16 14:07 ` Paul Durrant 2016-03-17 5:04 ` Bob Liu 2016-03-16 14:32 ` David Vrabel 2016-03-17 5:07 ` Bob Liu 2016-03-17 11:12 ` Ian Jackson 2016-03-17 11:18 ` David Vrabel 2016-03-17 11:20 ` Ian Jackson 2016-03-22 12:55 ` Bob Liu [this message] 2016-03-22 13:41 ` David Vrabel 2016-03-22 14:10 ` Konrad Rzeszutek Wilk 2016-03-22 14:38 ` David Vrabel 2016-03-22 14:43 ` Paul Durrant 2016-03-22 15:09 ` Ian Jackson 2016-03-22 15:25 ` Paul Durrant 2016-03-22 16:14 ` Ian Jackson 2016-03-22 16:50 ` Konrad Rzeszutek Wilk 2016-03-22 17:39 ` Paul Durrant 2016-03-22 15:12 ` Ian Jackson 2016-03-22 15:27 ` Konrad Rzeszutek Wilk 2016-03-22 16:11 ` Ian Jackson 2016-03-22 16:38 ` Konrad Rzeszutek Wilk 2016-03-22 16:25 ` Jan Beulich 2016-03-16 14:33 ` Ian Jackson
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