From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Durrant Subject: Re: [PATCH 5/5] x86/HVM: don't setup an intercept handler for IO port 0xcf8 unconditionally Date: Wed, 13 Jan 2016 16:48:21 +0000 Message-ID: <8122e183a2d14f759d983acf2777be06@AMSPEX02CL03.citrite.net> References: <1452688338-70075-1-git-send-email-roger.pau@citrix.com> <1452688338-70075-6-git-send-email-roger.pau@citrix.com> <56968BA902000078000C66BF@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aJOaw-0000CH-5D for xen-devel@lists.xenproject.org; Wed, 13 Jan 2016 16:48:26 +0000 In-Reply-To: <56968BA902000078000C66BF@prv-mh.provo.novell.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Jan Beulich , Roger Pau Monne Cc: Andrew Cooper , "xen-devel@lists.xenproject.org" List-Id: xen-devel@lists.xenproject.org > -----Original Message----- > From: Jan Beulich [mailto:JBeulich@suse.com] > Sent: 13 January 2016 16:39 > To: Paul Durrant; Roger Pau Monne > Cc: Andrew Cooper; xen-devel@lists.xenproject.org > Subject: Re: [PATCH 5/5] x86/HVM: don't setup an intercept handler for IO > port 0xcf8 unconditionally > > >>> On 13.01.16 at 13:32, wrote: > > Only intercept accesses to IO port 0xcf8 if there's at least one IOREQ > > server, otherwise it makes no sense since the only code that uses the value > > stored by hvm_access_cf8 is the IOREQ server. > > Afaict an ioreq server could also attach subsequently - Paul? > Indeed, ioreq servers can come and go at any time. Paul > Jan