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From: Ian Jackson <Ian.Jackson@eu.citrix.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: xen-devel@lists.xensource.com, qemu-devel@nongnu.org,
	Anthony Liguori <anthony@codemonkey.ws>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option
Date: Fri, 28 Jun 2013 11:54:59 +0100	[thread overview]
Message-ID: <20941.27523.823994.805482@mariner.uk.xensource.com> (raw)
In-Reply-To: <51CD41CB.50303@redhat.com>

Paolo Bonzini writes ("Re: [PATCH v2] xen_disk: support "direct-io-safe" backend option"):
> Il 27/06/2013 20:16, Stefano Stabellini ha scritto:
> > The original proposal for a "cache" backend option has been dropped
> > because it was believed too wide, especially considering that at the
> > moment the backend doesn't have a way to tell the toolstack that it is
> > capable of supporting it.
> 
> Given how rusty my xenstore-fu is, I'll ask the obvious: the frontend
> cannot write to it, can it?

No, the backend directory is writeable only by the toolstack and
driver domains.

Ian.

WARNING: multiple messages have this Message-ID (diff)
From: Ian Jackson <Ian.Jackson@eu.citrix.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: xen-devel@lists.xensource.com, qemu-devel@nongnu.org,
	Anthony Liguori <anthony@codemonkey.ws>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [PATCH v2] xen_disk: support "direct-io-safe" backend option
Date: Fri, 28 Jun 2013 11:54:59 +0100	[thread overview]
Message-ID: <20941.27523.823994.805482@mariner.uk.xensource.com> (raw)
In-Reply-To: <51CD41CB.50303@redhat.com>

Paolo Bonzini writes ("Re: [PATCH v2] xen_disk: support "direct-io-safe" backend option"):
> Il 27/06/2013 20:16, Stefano Stabellini ha scritto:
> > The original proposal for a "cache" backend option has been dropped
> > because it was believed too wide, especially considering that at the
> > moment the backend doesn't have a way to tell the toolstack that it is
> > capable of supporting it.
> 
> Given how rusty my xenstore-fu is, I'll ask the obvious: the frontend
> cannot write to it, can it?

No, the backend directory is writeable only by the toolstack and
driver domains.

Ian.

  reply	other threads:[~2013-06-28 10:55 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-27 18:16 [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option Stefano Stabellini
2013-06-27 18:16 ` Stefano Stabellini
2013-06-28  7:56 ` [Qemu-devel] " Paolo Bonzini
2013-06-28  7:56   ` Paolo Bonzini
2013-06-28 10:54   ` Ian Jackson [this message]
2013-06-28 10:54     ` Ian Jackson
2013-06-28 10:57   ` [Qemu-devel] " Stefano Stabellini
2013-06-28 10:57     ` Stefano Stabellini
2013-06-28  8:48 ` [Qemu-devel] " Alex Bligh
2013-06-28  8:48   ` Alex Bligh
2013-06-28 10:44   ` [Qemu-devel] " Ian Jackson
2013-06-28 10:44     ` Ian Jackson
2013-06-28 16:17     ` [Qemu-devel] " Alex Bligh
2013-06-28 16:17       ` Alex Bligh
2013-06-28 16:26       ` [Qemu-devel] " Paolo Bonzini
2013-06-28 16:26         ` Paolo Bonzini
2013-06-28 10:56   ` [Qemu-devel] " Stefano Stabellini
2013-06-28 10:56     ` Stefano Stabellini
2013-06-28 16:16 ` [Qemu-devel] " Stefano Stabellini
2013-06-28 16:51   ` George Dunlap

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