WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-ia64-devel

RE: [Xen-ia64-devel] [PATCH]Fix the logic when deassign the mmio ranges

To: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Subject: RE: [Xen-ia64-devel] [PATCH]Fix the logic when deassign the mmio ranges for vti-domain.
From: "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>
Date: Thu, 5 Mar 2009 11:55:10 +0800
Accept-language: en-US
Acceptlanguage: en-US
Cc: "xen-ia64-devel@xxxxxxxxxxxxxxxxxxx" <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Wed, 04 Mar 2009 19:57:26 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20090304121820.GE1438%yamahata@xxxxxxxxxxxxx>
List-help: <mailto:xen-ia64-devel-request@lists.xensource.com?subject=help>
List-id: Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>
List-post: <mailto:xen-ia64-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-ia64-devel>, <mailto:xen-ia64-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-ia64-devel>, <mailto:xen-ia64-devel-request@lists.xensource.com?subject=unsubscribe>
References: <706158FABBBA044BAD4FE898A02E4BC22435AF54@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090303091502.GC31543%yamahata@xxxxxxxxxxxxx> <706158FABBBA044BAD4FE898A02E4BC22435B088@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090303112748.GA1438%yamahata@xxxxxxxxxxxxx> <706158FABBBA044BAD4FE898A02E4BC2243A433A@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> <20090304121820.GE1438%yamahata@xxxxxxxxxxxxx>
Sender: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Acmcw1CM691eRmbHR/OowdFaA6BBawAgnEPA
Thread-topic: [Xen-ia64-devel] [PATCH]Fix the logic when deassign the mmio ranges for vti-domain.
Isaku Yamahata wrote:
> On Wed, Mar 04, 2009 at 05:26:41PM +0800, Zhang, Xiantao wrote:
>> So far, we just found the msi-x case. Maybe we will add msi-x
>> support later, so this fix is also required. 
> 
> Okay, makes sense.
> 
>>>>> And why GPFN_LOW_MMIO independently of addr? Shouldn't it be aware
>>>>> of io_ranges[]?
>>>> 
>>>> For the low mmio ranges (3G-3.5G), we can use the fixed mfn
>>>> GPFN_LOW_MMIO combined with ASSIGN_io to indicate whether the p2m
>>>> entries are mmio ranges.   You may refer to io_ranges and it also
>>>> use the fixed GPFN_LOW_MMIO to intialize p2m entries for low mmio
>>>> range.
>>> 
>>> Hmm, there are two cases to call
>>> xc_domain_mempry_mapping(DPCI_REMOVE_MAPPING). - Just to remove the
>>>   entry. zap_domain_page_one() is wanted.
>> 
>> Why remove the entries ?  For hvm domain, I think the entires should
>> always exists during the lift of the guests. 
>> You may refer to the call vmx_build_io_physmap_table, and these
>> entries are created at the initialization time of the domain. 
>> 
>>>   the one in pt_iomem_map() and remove_msix_mapping() excpet called
>>>   by pt_iomem_map()
>> 
>>> 
>>> - mmio on the area should be rounted to qemu-dm
>>>   GPFN_LOW_MMIO and ASSIGN_io are wanted.
>>> 
>>>   remove_msix_mapping() which is called by pt_iomem_map().
>>> 
>>> Is there a way to distinguish them.
>> 
>> We don't need to distinguish them, and instead of we should keep
>> these entires in two cases consistent with the values which is
>> initilized by vmx_build_io_physmap_table.  
> 
> The current x86 implementation mmio which isn't handled by xen VMM
> are passed to qemu-dm.
> On the other hand, the current xen/ia64 check _PAGE_IO and
> if _PAGE_IO it is passed to qemu-dm, otherwise panic_domain()
> So the behaviour should be changed such that if load/store on
> the unpresent p2m entry is passed to qemu-dm like x86. 

That may change much logic.  For hvm/ia64, we have the assumption that all p2m 
entries  for mmio range should exist, and use the
_PAGE_IO to identify its type. 

Xiantao



_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel