From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Chen, Tiejun" Subject: Re: [v7][PATCH 06/16] hvmloader/pci: skip reserved ranges Date: Wed, 15 Jul 2015 19:34:37 +0800 Message-ID: <55A6454D.2000201@intel.com> References: <1436420047-25356-1-git-send-email-tiejun.chen@intel.com> <1436420047-25356-7-git-send-email-tiejun.chen@intel.com> <55A3D5600200007800090330@mail.emea.novell.com> <55A4AE88.2000200@intel.com> <55A4F2270200007800090834@mail.emea.novell.com> <55A4EA54.60708@intel.com> <55A5138F0200007800090A71@mail.emea.novell.com> <55A5AF6F.1050305@intel.com> <55A5E122.7030203@intel.com> <55A6374E02000078000911EC@mail.emea.novell.com> <55A6210E.8080406@intel.com> <55A64386020000780009132E@mail.emea.novell.com> <55A6374F.6030901@intel.com> <55A65F620200007800091472@mail.emea.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55A65F620200007800091472@mail.emea.novell.com> 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 Cc: Wei Liu , Ian Campbell , Stefano Stabellini , Andrew Cooper , Ian Jackson , xen-devel@lists.xen.org, Keir Fraser List-Id: xen-devel@lists.xenproject.org >> Maybe I can move this chunk of codes downward those actual allocation >> to check if RDM conflicts with the final allocation, and then just >> disable those associated devices by writing PCI_COMMAND without BUG() >> like this draft code, > > And what would keep the guest from re-enabling the device? > We can't but IMO, #1. We're already posting that warning messages. #2. Actually this is like this sort of case like, as you known, even in the native platform, some broken devices are also disabled by BIOS, right? So I think this is OS's responsibility or risk to force enabling such a broken device. #3. Its really rare possibility in real world. Thanks Tiejun