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Xin, Xiaohui

2008-May-09 09:10 UTC

[Xen-devel][PATCH] patch to support super page (2M) with EPT

Attached are the patches to support super page with EPT. We only support
2M size. And shadow may still work fine with 4K pages.

The patches can be split into 3 parts. Apply order is as attached.

 

tool.diff 

To allocate 2M physical contiguous memory in guest except the first 2M
and the last 2M.

The first 2M covers special memory, and Xen use the last few pages in
guest memory to do special things.

We let them to be 4K pages as normal.

super_page_common.patch 

To modify the p2m interfaces by adding an order parameter, such as
guest_physmap_add_page(), p2m_set_entry(), etc.

p2m-ept-file.patch

            To handle the EPT tables to support super page.            

 

 

Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>

Signed-off-by: Li Xin, B <xin.b.li@intel.com>

 

 

 






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

Huang2, Wei

2008-May-11 20:33 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Could we work together for a common solution? As far as I can see, it
largely overlaps with my super page patch. The major difference is
between p2m.c and p2m-ept.c.

 

-Wei

 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
Sent: Friday, May 09, 2008 4:11 AM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel][PATCH] patch to support super page (2M) with EPT

 

Attached are the patches to support super page with EPT. We only support
2M size. And shadow may still work fine with 4K pages.

The patches can be split into 3 parts. Apply order is as attached.

 

tool.diff 

To allocate 2M physical contiguous memory in guest except the first 2M
and the last 2M.

The first 2M covers special memory, and Xen use the last few pages in
guest memory to do special things.

We let them to be 4K pages as normal.

super_page_common.patch 

To modify the p2m interfaces by adding an order parameter, such as
guest_physmap_add_page(), p2m_set_entry(), etc.

p2m-ept-file.patch

            To handle the EPT tables to support super page.            

 

 

Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>

Signed-off-by: Li Xin, B <xin.b.li@intel.com>

 

 

 



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

Huang2, Wei

2008-May-12 04:36 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

This is the latest one I created. Please review it and I will re-submit.

 

1.      It includes the patch for p2m-ept.c, directly from your previous
patch. 

2.      Xc_hvm_create.c is based on my original approach. It includes
support for both 2MB and 4MB pages. Also it considers the case of odd
page size (such as 255MB). But I did not allocate the last 2MB area
using 4KB  pages. Let me know if it is a big issue.

3.      The rest are pretty similar.

 

Thanks,

 

-Wei

 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
Sent: Sunday, May 11, 2008 3:34 PM
To: Xin, Xiaohui; xen-devel@lists.xensource.com
Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with
EPT

 

Could we work together for a common solution? As far as I can see, it
largely overlaps with my super page patch. The major difference is
between p2m.c and p2m-ept.c.

 

-Wei

 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
Sent: Friday, May 09, 2008 4:11 AM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel][PATCH] patch to support super page (2M) with EPT

 

Attached are the patches to support super page with EPT. We only support
2M size. And shadow may still work fine with 4K pages.

The patches can be split into 3 parts. Apply order is as attached.

 

tool.diff 

To allocate 2M physical contiguous memory in guest except the first 2M
and the last 2M.

The first 2M covers special memory, and Xen use the last few pages in
guest memory to do special things.

We let them to be 4K pages as normal.

super_page_common.patch 

To modify the p2m interfaces by adding an order parameter, such as
guest_physmap_add_page(), p2m_set_entry(), etc.

p2m-ept-file.patch

            To handle the EPT tables to support super page.            

 

 

Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>

Signed-off-by: Li Xin, B <xin.b.li@intel.com>

 

 

 




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Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Xin, Xiaohui

2008-May-12 05:04 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Some comments here:

1) Basically 4M pages allocations is not hardware naturally for EPT, we
only use 2M super pages now. 

I remembered that Keir said that 2M pages allocation is sufficient, and
he removed all the pure 32bit support already.

2)  If we don''t allocate the last 2M area with 4kb pages, the EPT will
meet some problem. Xen will set one of the 4k page

     there to be invalid, logically that means we should invalid the all
the 2M page if we allocate it with 2M, and then the 

     special pages Xen used in the high end of the guest memory can not
be used then. May we know how you cope with that?

 

Thanks

Xiaohui

 

________________________________

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
Sent: Monday, May 12, 2008 12:36 PM
To: Xin, Xiaohui; xen-devel@lists.xensource.com
Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with
EPT

 

This is the latest one I created. Please review it and I will re-submit.

 

1.       It includes the patch for p2m-ept.c, directly from your
previous patch. 

2.       Xc_hvm_create.c is based on my original approach. It includes
support for both 2MB and 4MB pages. Also it considers the case of odd
page size (such as 255MB). But I did not allocate the last 2MB area
using 4KB  pages. Let me know if it is a big issue.

3.       The rest are pretty similar.

 

Thanks,

 

-Wei

 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
Sent: Sunday, May 11, 2008 3:34 PM
To: Xin, Xiaohui; xen-devel@lists.xensource.com
Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with
EPT

 

Could we work together for a common solution? As far as I can see, it
largely overlaps with my super page patch. The major difference is
between p2m.c and p2m-ept.c.

 

-Wei

 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
Sent: Friday, May 09, 2008 4:11 AM
To: xen-devel@lists.xensource.com
Subject: [Xen-devel][PATCH] patch to support super page (2M) with EPT

 

Attached are the patches to support super page with EPT. We only support
2M size. And shadow may still work fine with 4K pages.

The patches can be split into 3 parts. Apply order is as attached.

 

tool.diff 

To allocate 2M physical contiguous memory in guest except the first 2M
and the last 2M.

The first 2M covers special memory, and Xen use the last few pages in
guest memory to do special things.

We let them to be 4K pages as normal.

super_page_common.patch 

To modify the p2m interfaces by adding an order parameter, such as
guest_physmap_add_page(), p2m_set_entry(), etc.

p2m-ept-file.patch

            To handle the EPT tables to support super page.            

 

 

Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>

Signed-off-by: Li Xin, B <xin.b.li@intel.com>

 

 

 



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

Keir Fraser

2008-May-12 07:03 UTC

head link

Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Yes, absolutely no need for 4M page support. We do not support the 32-bit
non-PAE build target any more.

 -- Keir

On 12/5/08 06:04, "Xin, Xiaohui" <xiaohui.xin@intel.com> wrote:
> Some comments here:
> 1) Basically 4M pages allocations is not hardware naturally for EPT, we
only
> use 2M super pages now.
> I remembered that Keir said that 2M pages allocation is sufficient, and he
> removed all the pure 32bit support already.
> 2)  If we don¹t allocate the last 2M area with 4kb pages, the EPT will meet
> some problem. Xen will set one of the 4k page
>      there to be invalid, logically that means we should invalid the all
the
> 2M page if we allocate it with 2M, and then the
>      special pages Xen used in the high end of the guest memory can not be
> used then. May we know how you cope with that?
>  
> Thanks
> Xiaohui
>  
> 
> 
> From: xen-devel-bounces@lists.xensource.com
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
> Sent: Monday, May 12, 2008 12:36 PM
> To: Xin, Xiaohui; xen-devel@lists.xensource.com
> Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT
>  
> This is the latest one I created. Please review it and I will re-submit.
>  
> 1.      It includes the patch for p2m-ept.c, directly from your previous
> patch. 
> 
> 2.      Xc_hvm_create.c is based on my original approach. It includes
support
> for both 2MB and 4MB pages. Also it considers the case of odd page size
(such
> as 255MB). But I did not allocate the last 2MB area using 4KB  pages. Let
me
> know if it is a big issue.
> 
> 3.      The rest are pretty similar.
> 
>  
> Thanks,
>  
> -Wei
>  
> 
> From: xen-devel-bounces@lists.xensource.com
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
> Sent: Sunday, May 11, 2008 3:34 PM
> To: Xin, Xiaohui; xen-devel@lists.xensource.com
> Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT
>  
> Could we work together for a common solution? As far as I can see, it
largely
> overlaps with my super page patch. The major difference is between p2m.c
and
> p2m-ept.c.
>  
> -Wei
>  
> 
> From: xen-devel-bounces@lists.xensource.com
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
> Sent: Friday, May 09, 2008 4:11 AM
> To: xen-devel@lists.xensource.com
> Subject: [Xen-devel][PATCH] patch to support super page (2M) with EPT
>  
> Attached are the patches to support super page with EPT. We only support 2M
> size. And shadow may still work fine with 4K pages.
> The patches can be split into 3 parts. Apply order is as attached.
>  
> tool.diff 
> To allocate 2M physical contiguous memory in guest except the first 2M and
the
> last 2M.
> The first 2M covers special memory, and Xen use the last few pages in guest
> memory to do special things.
> We let them to be 4K pages as normal.
> super_page_common.patch
> To modify the p2m interfaces by adding an order parameter, such as
> guest_physmap_add_page(), p2m_set_entry(), etc.
> p2m-ept-file.patch
>            To handle the EPT tables to support super page.
>  
>  
> Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
> Signed-off-by: Li Xin, B <xin.b.li@intel.com>
>  
>  
>  
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel



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

Huang2, Wei

2008-May-12 12:14 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

I will re-submit another one today.

-----Original Message-----
From: Keir Fraser <keir.fraser@eu.citrix.com>
Sent: Monday, May 12, 2008 2:03 AM
To: Xin, Xiaohui <xiaohui.xin@intel.com>; Huang2, Wei
<Wei.Huang2@amd.com>; xen-devel@lists.xensource.com
<xen-devel@lists.xensource.com>
Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Yes, absolutely no need for 4M page support. We do not support the 32-bit
non-PAE build target any more.

 -- Keir

On 12/5/08 06:04, "Xin, Xiaohui" <xiaohui.xin@intel.com> wrote:



	Some comments here:
	1) Basically 4M pages allocations is not hardware naturally for EPT, we only
use 2M super pages now.
	I remembered that Keir said that 2M pages allocation is sufficient, and he
removed all the pure 32bit support already.
	2)  If we dont allocate the last 2M area with 4kb pages, the EPT will meet
some problem. Xen will set one of the 4k page
	     there to be invalid, logically that means we should invalid the all the 2M
page if we allocate it with 2M, and then the
	     special pages Xen used in the high end of the guest memory can not be used
then. May we know how you cope with that?
	 
	Thanks
	Xiaohui
	 
	

	________________________________

	From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
	Sent: Monday, May 12, 2008 12:36 PM
	To: Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT
	
	This is the latest one I created. Please review it and I will re-submit.
	 
	1.      It includes the patch for p2m-ept.c, directly from your previous patch.
	
	2.      Xc_hvm_create.c is based on my original approach. It includes support
for both 2MB and 4MB pages. Also it considers the case of odd page size (such as
255MB). But I did not allocate the last 2MB area using 4KB  pages. Let me know
if it is a big issue.
	
	3.      The rest are pretty similar.
	
	
	Thanks,
	 
	-Wei
	 
	
	From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
	Sent: Sunday, May 11, 2008 3:34 PM
	To: Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT
	
	Could we work together for a common solution? As far as I can see, it largely
overlaps with my super page patch. The major difference is between p2m.c and
p2m-ept.c.
	 
	-Wei
	 
	
	From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
	Sent: Friday, May 09, 2008 4:11 AM
	To: xen-devel@lists.xensource.com
	Subject: [Xen-devel][PATCH] patch to support super page (2M) with EPT
	
	Attached are the patches to support super page with EPT. We only support 2M
size. And shadow may still work fine with 4K pages.
	The patches can be split into 3 parts. Apply order is as attached.
	 
	tool.diff 
	To allocate 2M physical contiguous memory in guest except the first 2M and the
last 2M.
	The first 2M covers special memory, and Xen use the last few pages in guest
memory to do special things.
	We let them to be 4K pages as normal.
	super_page_common.patch 
	To modify the p2m interfaces by adding an order parameter, such as
guest_physmap_add_page(), p2m_set_entry(), etc.
	p2m-ept-file.patch
	           To handle the EPT tables to support super page.            
	 
	 
	Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
	Signed-off-by: Li Xin, B <xin.b.li@intel.com>
	 
	
	 
	
	
________________________________

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





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

Huang2, Wei

2008-May-12 17:28 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Here is a revised version. I get rid of 4MB support, as suggested. I did
not see the issue mentioned by Xiaohui related to splitting last 2M into
4KB pages. But anyway, I attached two versions for your reference. Keir,
please let me know if you have comments.
 
 
-Wei

________________________________

From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
Sent: Monday, May 12, 2008 2:03 AM
To: Xin, Xiaohui; Huang2, Wei; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with
EPT


Yes, absolutely no need for 4M page support. We do not support the
32-bit non-PAE build target any more.

 -- Keir

On 12/5/08 06:04, "Xin, Xiaohui" <xiaohui.xin@intel.com> wrote:



	Some comments here:
	1) Basically 4M pages allocations is not hardware naturally for
EPT, we only use 2M super pages now. 
	I remembered that Keir said that 2M pages allocation is
sufficient, and he removed all the pure 32bit support already.
	2)  If we don''t allocate the last 2M area with 4kb pages, the
EPT will meet some problem. Xen will set one of the 4k page
	     there to be invalid, logically that means we should invalid
the all the 2M page if we allocate it with 2M, and then the 
	     special pages Xen used in the high end of the guest memory
can not be used then. May we know how you cope with that?
	 
	Thanks
	Xiaohui
	 
	

	
________________________________


	From: xen-devel-bounces@lists.xensource.com [
mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
	Sent: Monday, May 12, 2008 12:36 PM
	To: Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch to support super page (2M)
with EPT
	
	This is the latest one I created. Please review it and I will
re-submit.
	 
	1.      It includes the patch for p2m-ept.c, directly from your
previous patch. 
	
	2.      Xc_hvm_create.c is based on my original approach. It
includes support for both 2MB and 4MB pages. Also it considers the case
of odd page size (such as 255MB). But I did not allocate the last 2MB
area using 4KB  pages. Let me know if it is a big issue.
	
	3.      The rest are pretty similar.
	
	
	Thanks,
	 
	-Wei
	 
	
	From: xen-devel-bounces@lists.xensource.com [
mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
	Sent: Sunday, May 11, 2008 3:34 PM
	To: Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch to support super page (2M)
with EPT
	
	Could we work together for a common solution? As far as I can
see, it largely overlaps with my super page patch. The major difference
is between p2m.c and p2m-ept.c.
	 
	-Wei
	 
	
	From: xen-devel-bounces@lists.xensource.com [
mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Xin, Xiaohui
	Sent: Friday, May 09, 2008 4:11 AM
	To: xen-devel@lists.xensource.com
	Subject: [Xen-devel][PATCH] patch to support super page (2M)
with EPT
	
	Attached are the patches to support super page with EPT. We only
support 2M size. And shadow may still work fine with 4K pages.
	The patches can be split into 3 parts. Apply order is as
attached.
	 
	tool.diff 
	To allocate 2M physical contiguous memory in guest except the
first 2M and the last 2M.
	The first 2M covers special memory, and Xen use the last few
pages in guest memory to do special things.
	We let them to be 4K pages as normal.
	super_page_common.patch 
	To modify the p2m interfaces by adding an order parameter, such
as guest_physmap_add_page(), p2m_set_entry(), etc.
	p2m-ept-file.patch
	           To handle the EPT tables to support super page.

	 
	 
	Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
	Signed-off-by: Li Xin, B <xin.b.li@intel.com>
	 
	
	 
	
	
________________________________

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







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

Keir Fraser

2008-May-13 08:46 UTC

head link

Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Overall your changes to common code seem a bit more invasive than in the
Intel patch. In particular I don¹t understand why you made such changes to
common/memory.c. The other patch makes far fewer changes (and even some of
those would go away since they have erroneously changed the populate_physmap
interface). So my feeling is that the Intel patch is a slightly more elegant
base to start with: extra changes that your patch makes really need to be
accounted for.

 -- Keir

On 12/5/08 18:28, "Huang2, Wei" <Wei.Huang2@amd.com> wrote:
> Here is a revised version. I get rid of 4MB support, as suggested. I did
not
> see the issue mentioned by Xiaohui related to splitting last 2M into 4KB
> pages. But anyway, I attached two versions for your reference. Keir, please
> let me know if you have comments.
>  
>  
> -Wei
> 
> 
> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
> Sent: Monday, May 12, 2008 2:03 AM
> To: Xin, Xiaohui; Huang2, Wei; xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT
> 
> Yes, absolutely no need for 4M page support. We do not support the 32-bit
> non-PAE build target any more.
> 
>  -- Keir
> 
> On 12/5/08 06:04, "Xin, Xiaohui" <xiaohui.xin@intel.com>
wrote:
> 
>> Some comments here:
>> 1) Basically 4M pages  allocations is not hardware naturally for EPT,
we only
>> use 2M super pages now.
>> I remembered that Keir said that 2M pages allocation is sufficient, and
he
>> removed all the pure 32bit support already.
>> 2)  If we don¹t allocate  the last 2M area with 4kb pages, the EPT will
meet
>> some problem. Xen will set  one of the 4k page
>>      there to be invalid,  logically that means we should invalid the
all the
>> 2M page if we allocate it  with 2M, and then the
>>      special pages Xen used  in the high end of the guest memory can
not be
>> used then. May we know how you  cope with  that?
>>  
>> Thanks
>> Xiaohui
>>  
>>  
>>  
>> 
>>   
>> From:  xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2,
Wei
>> Sent: Monday, May 12, 2008 12:36  PM
>> To: Xin, Xiaohui;  xen-devel@lists.xensource.com
>> Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with
EPT
>> 
>> This is the latest one I created. Please review it and  I will
re-submit.
>>  
>> 1.       It includes the  patch for p2m-ept.c, directly from your
previous
>> patch.  
>> 
>> 2.       Xc_hvm_create.c  is based on my original approach. It includes
>> support for both 2MB and 4MB  pages. Also it considers the case of odd
page
>> size (such as 255MB). But I did  not allocate the last 2MB area using
4KB
>> pages. Let me know if it is a  big issue.
>> 
>> 3.       The rest are  pretty similar.
>> 
>> 
>> Thanks,
>>  
>> -Wei
>>  
>> 
>> From: xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2,
Wei
>> Sent: Sunday, May 11, 2008 3:34  PM
>> To: Xin, Xiaohui;  xen-devel@lists.xensource.com
>> Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with
EPT
>> 
>> Could we work together for a common solution? As far  as I can see, it
>> largely overlaps with my super page patch. The major  difference is
between
>> p2m.c and  p2m-ept.c.
>>  
>> -Wei
>>  
>> 
>> From: xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Xin,
Xiaohui
>> Sent: Friday, May 09, 2008 4:11  AM
>> To: xen-devel@lists.xensource.com
>> Subject:  [Xen-devel][PATCH] patch to support super page (2M) with  EPT
>> 
>> Attached are the patches to support  super page with EPT. We only
support 2M
>> size. And shadow may still work fine  with 4K pages.
>> The patches can be split into 3 parts. Apply order is as  attached.
>>  
>> tool.diff 
>> To allocate 2M physical contiguous memory  in guest except the first 2M
and
>> the last 2M.
>> The first 2M covers special  memory, and Xen use the last few pages in
guest
>> memory to do special  things.
>> We let them to be 4K pages as normal.
>> super_page_common.patch
>> To modify the p2m interfaces by adding an order parameter, such as
>> guest_physmap_add_page(), p2m_set_entry(),  etc.
>> p2m-ept-file.patch
>>            To  handle the EPT tables to support super page.
>>  
>>  
>> Signed-off-by:  Xin Xiaohui <xiaohui.xin@intel.com>
>> Signed-off-by: Li Xin, B  <xin.b.li@intel.com>
>>  
>> 
>>  
>> 
>>  
>> 
>>  _______________________________________________
>> Xen-devel  mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel



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

Huang2, Wei

2008-May-13 13:36 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Memory.c looks more invasive because it takes care of failure cases
using 4KB pages. Xiaohui''s patch tries to allocate pages using
extend_order. But if this request fails for any reason, the guest cannot
be started anymore. 

 

-Wei

 

From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
Sent: Tuesday, May 13, 2008 3:47 AM
To: Huang2, Wei; Xin, Xiaohui; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with
EPT

 

Overall your changes to common code seem a bit more invasive than in the
Intel patch. In particular I don''t understand why you made such changes
to common/memory.c. The other patch makes far fewer changes (and even
some of those would go away since they have erroneously changed the
populate_physmap interface). So my feeling is that the Intel patch is a
slightly more elegant base to start with: extra changes that your patch
makes really need to be accounted for.

 -- Keir

On 12/5/08 18:28, "Huang2, Wei" <Wei.Huang2@amd.com> wrote:

Here is a revised version. I get rid of 4MB support, as suggested. I did
not see the issue mentioned by Xiaohui related to splitting last 2M into
4KB pages. But anyway, I attached two versions for your reference. Keir,
please let me know if you have comments.

 
-Wei

________________________________

From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
Sent: Monday, May 12, 2008 2:03 AM
To: Xin, Xiaohui; Huang2, Wei; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with
EPT

Yes, absolutely no need for 4M page support. We do not support the
32-bit non-PAE build target any more.

 -- Keir

On 12/5/08 06:04, "Xin, Xiaohui" <xiaohui.xin@intel.com> wrote:

Some comments here:
1) Basically 4M pages  allocations is not hardware naturally for EPT, we
only use 2M super pages now.  
I remembered that Keir said that 2M pages allocation is sufficient, and
he  removed all the pure 32bit support already.
2)  If we don''t allocate  the last 2M area with 4kb pages, the EPT will
meet some problem. Xen will set  one of the 4k page
     there to be invalid,  logically that means we should invalid the
all the 2M page if we allocate it  with 2M, and then the 
     special pages Xen used  in the high end of the guest memory can not
be used then. May we know how you  cope with  that?
 
Thanks
Xiaohui
 

 

________________________________

From:  xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2, Wei
Sent: Monday, May 12, 2008 12:36  PM
To: Xin, Xiaohui;  xen-devel@lists.xensource.com
Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with
EPT

This is the latest one I created. Please review it and  I will
re-submit.
 
1.       It includes the  patch for p2m-ept.c, directly from your
previous patch.  

2.       Xc_hvm_create.c  is based on my original approach. It includes
support for both 2MB and 4MB  pages. Also it considers the case of odd
page size (such as 255MB). But I did  not allocate the last 2MB area
using 4KB  pages. Let me know if it is a  big issue.

3.       The rest are  pretty similar.


Thanks,
 
-Wei
 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2, Wei
Sent: Sunday, May 11, 2008 3:34  PM
To: Xin, Xiaohui;  xen-devel@lists.xensource.com
Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with
EPT

Could we work together for a common solution? As far  as I can see, it
largely overlaps with my super page patch. The major  difference is
between p2m.c and  p2m-ept.c.
 
-Wei
 

From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Xin,
Xiaohui
Sent: Friday, May 09, 2008 4:11  AM
To: xen-devel@lists.xensource.com
Subject:  [Xen-devel][PATCH] patch to support super page (2M) with  EPT

Attached are the patches to support  super page with EPT. We only
support 2M size. And shadow may still work fine  with 4K pages.
The patches can be split into 3 parts. Apply order is as  attached.
 
tool.diff 
To allocate 2M physical contiguous memory  in guest except the first 2M
and the last 2M.
The first 2M covers special  memory, and Xen use the last few pages in
guest memory to do special  things.
We let them to be 4K pages as normal.
super_page_common.patch  
To modify the p2m interfaces by adding an order parameter, such as
guest_physmap_add_page(), p2m_set_entry(),  etc.
p2m-ept-file.patch
           To  handle the EPT tables to support super page.             
 
 
Signed-off-by:  Xin Xiaohui <xiaohui.xin@intel.com>
Signed-off-by: Li Xin, B  <xin.b.li@intel.com>
 

 

 

________________________________

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

 

________________________________

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

 



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

Li, Xin B

2008-May-13 13:39 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

if 2M page allocation fails, the domain builer will try to use 4K allocation
instead.
-Xin


________________________________

	From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, Wei
	Sent: 2008年5月13日 21:37
	To: Keir Fraser; Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT
	
	

	Memory.c looks more invasive because it takes care of failure cases using 4KB
pages. Xiaohui’s patch tries to allocate pages using extend_order. But if this
request fails for any reason, the guest cannot be started anymore.

	 

	-Wei

	 

	From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
	Sent: Tuesday, May 13, 2008 3:47 AM
	To: Huang2, Wei; Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT

	 

	Overall your changes to common code seem a bit more invasive than in the Intel
patch. In particular I don’t understand why you made such changes to
common/memory.c. The other patch makes far fewer changes (and even some of those
would go away since they have erroneously changed the populate_physmap
interface). So my feeling is that the Intel patch is a slightly more elegant
base to start with: extra changes that your patch makes really need to be
accounted for.
	
	 -- Keir
	
	On 12/5/08 18:28, "Huang2, Wei" <Wei.Huang2@amd.com> wrote:

	Here is a revised version. I get rid of 4MB support, as suggested. I did not
see the issue mentioned by Xiaohui related to splitting last 2M into 4KB pages.
But anyway, I attached two versions for your reference. Keir, please let me know
if you have comments.
	
	 
	-Wei

	
________________________________


	From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
	Sent: Monday, May 12, 2008 2:03 AM
	To: Xin, Xiaohui; Huang2, Wei; xen-devel@lists.xensource.com
	Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT
	
	Yes, absolutely no need for 4M page support. We do not support the 32-bit
non-PAE build target any more.
	
	 -- Keir
	
	On 12/5/08 06:04, "Xin, Xiaohui" <xiaohui.xin@intel.com> wrote:

	Some comments here:
	1) Basically 4M pages  allocations is not hardware naturally for EPT, we only
use 2M super pages now.
	I remembered that Keir said that 2M pages allocation is sufficient, and he 
removed all the pure 32bit support already.
	2)  If we don’t allocate  the last 2M area with 4kb pages, the EPT will meet
some problem. Xen will set  one of the 4k page
	     there to be invalid,  logically that means we should invalid the all the
2M page if we allocate it  with 2M, and then the
	     special pages Xen used  in the high end of the guest memory can not be
used then. May we know how you  cope with  that?
	 
	Thanks
	Xiaohui
	 

	 

	
________________________________


	From:  xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2, Wei
	Sent: Monday, May 12, 2008 12:36  PM
	To: Xin, Xiaohui;  xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with EPT
	
	This is the latest one I created. Please review it and  I will re-submit.
	 
	1.       It includes the  patch for p2m-ept.c, directly from your previous
patch.
	
	2.       Xc_hvm_create.c  is based on my original approach. It includes support
for both 2MB and 4MB  pages. Also it considers the case of odd page size (such
as 255MB). But I did  not allocate the last 2MB area using 4KB  pages. Let me
know if it is a  big issue.
	
	3.       The rest are  pretty similar.
	
	
	Thanks,
	 
	-Wei
	 
	
	From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2, Wei
	Sent: Sunday, May 11, 2008 3:34  PM
	To: Xin, Xiaohui;  xen-devel@lists.xensource.com
	Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with EPT
	
	Could we work together for a common solution? As far  as I can see, it largely
overlaps with my super page patch. The major  difference is between p2m.c and 
p2m-ept.c.
	 
	-Wei
	 
	
	From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Xin, Xiaohui
	Sent: Friday, May 09, 2008 4:11  AM
	To: xen-devel@lists.xensource.com
	Subject:  [Xen-devel][PATCH] patch to support super page (2M) with  EPT
	
	Attached are the patches to support  super page with EPT. We only support 2M
size. And shadow may still work fine  with 4K pages.
	The patches can be split into 3 parts. Apply order is as  attached.
	 
	tool.diff 
	To allocate 2M physical contiguous memory  in guest except the first 2M and the
last 2M.
	The first 2M covers special  memory, and Xen use the last few pages in guest
memory to do special  things.
	We let them to be 4K pages as normal.
	super_page_common.patch  
	To modify the p2m interfaces by adding an order parameter, such as 
guest_physmap_add_page(), p2m_set_entry(),  etc.
	p2m-ept-file.patch
	           To  handle the EPT tables to support super page.             
	 
	 
	Signed-off-by:  Xin Xiaohui <xiaohui.xin@intel.com>
	Signed-off-by: Li Xin, B  <xin.b.li@intel.com>
	 
	
	 
	
	 

	
________________________________


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

	 

	
________________________________


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

	 



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

Keir Fraser

2008-May-13 13:51 UTC

head link

Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Exactly. The interface for populate_physmap() is clear — if you ask for
order-9 allocations then that is what you must get. Otherwise the allocation
fails. It is up to the caller to retry with order-0 allocations _if_ that is
a suitable fallback.

 -- Keir

On 13/5/08 14:39, "Li, Xin B" <xin.b.li@intel.com> wrote:
> if 2M page allocation fails, the domain builer will try to use 4K
allocation
> instead.
> -Xin
> 
>>  
>>  
>> 
>>  From: xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2, 
Wei
>> Sent: 2008年5月13日 21:37
>> To: Keir Fraser; Xin, Xiaohui;  xen-devel@lists.xensource.com
>> Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with
EPT
>> 
>>  
>>  
>>  
>> 
>> Memory.c  looks more invasive because it takes care of failure cases
using
>> 4KB pages.  Xiaohui’s patch tries to allocate pages using extend_order.
But
>> if this  request fails for any reason, the guest cannot be started
anymore.
>>  
>>  
>>  
>> -Wei
>>  
>>  
>>  
>>  
>>  
>> 
>> From: Keir Fraser  [mailto:keir.fraser@eu.citrix.com]
>> Sent: Tuesday, May 13, 2008 3:47  AM
>> To: Huang2, Wei; Xin, Xiaohui;  xen-devel@lists.xensource.com
>> Subject: Re: [Xen-devel][PATCH] patch  to support super page (2M) with
EPT
>>  
>>  
>>  
>> Overall your  changes to common code seem a bit more invasive than in
the
>> Intel patch. In  particular I don’t understand why you made such
changes to
>> common/memory.c.  The other patch makes far fewer changes (and even
some of
>> those would go away  since they have erroneously changed the
populate_physmap
>> interface). So my  feeling is that the Intel patch is a slightly more
elegant
>> base to start with:  extra changes that your patch makes really need to
be
>> accounted  for.
>> 
>>  -- Keir
>> 
>> On 12/5/08 18:28, "Huang2, Wei"  <Wei.Huang2@amd.com>
wrote:
>>  
>> Here is  a revised version. I get rid of 4MB support, as suggested. I
did not
>> see the  issue mentioned by Xiaohui related to splitting last 2M into
4KB
>> pages. But  anyway, I attached two versions for your reference. Keir,
please
>> let me know  if you have comments.
>> 
>>  
>> -Wei
>>  
>>  
>> 
>>  
>>  
>> 
>> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
>> Sent: Monday, May 12, 2008 2:03 AM
>> To: Xin, Xiaohui;  Huang2, Wei; xen-devel@lists.xensource.com
>> Subject: Re:  [Xen-devel][PATCH] patch to support super page (2M) with
EPT
>> 
>> Yes,  absolutely no need for 4M page support. We do not support the
32-bit
>> non-PAE  build target any more.
>> 
>>  -- Keir
>> 
>> On 12/5/08 06:04, "Xin,  Xiaohui"
<xiaohui.xin@intel.com> wrote:
>>  
>> Some  comments here:
>> 1) Basically 4M pages  allocations is not hardware  naturally for EPT,
we
>> only use 2M super pages now.
>> I remembered that  Keir said that 2M pages allocation is sufficient,
and he
>> removed all the  pure 32bit support already.
>> 2)  If we don’t allocate  the last 2M  area with 4kb pages, the EPT
will meet
>> some problem. Xen will set  one of  the 4k page
>>      there to be invalid,   logically that means we should invalid the
all
>> the 2M page if we  allocate it  with 2M, and then the
>>      special pages Xen used  in the high end  of the guest memory can
not be
>> used then. May we know how you  cope with   that?
>>  
>> Thanks
>> Xiaohui
>>  
>>  
>>  
>>  
>>  
>> 
>>  
>>  
>> 
>> From:   xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com]   On Behalf Of Huang2,
Wei
>> Sent: Monday, May 12, 2008  12:36  PM
>> To: Xin, Xiaohui;   xen-devel@lists.xensource.com
>> Subject: RE: [Xen-devel][PATCH]  patch  to support super page (2M) with
EPT
>> 
>> This  is the latest one I created. Please review it and  I will 
re-submit.
>>  
>> 1.        It  includes the  patch for p2m-ept.c, directly from your
previous
>> patch.   
>> 
>> 2.        Xc_hvm_create.c   is based on my original approach. It
includes
>> support for both 2MB and  4MB  pages. Also it considers the case of odd
page
>> size (such as 255MB).  But I did  not allocate the last 2MB area using
4KB
>> pages. Let me  know if it is a  big issue.
>> 
>> 3.        The  rest are  pretty similar.
>> 
>> 
>> Thanks,
>>  
>> -Wei
>>  
>> 
>> From:  xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com]   On Behalf Of Huang2,
Wei
>> Sent: Sunday, May 11, 2008  3:34  PM
>> To: Xin, Xiaohui;   xen-devel@lists.xensource.com
>> Subject: RE: [Xen-devel][PATCH]  patch  to support super page (2M) with
EPT
>> 
>> Could  we work together for a common solution? As far  as I can see, it
>> largely  overlaps with my super page patch. The major  difference is
between
>> p2m.c  and  p2m-ept.c.
>>  
>> -Wei
>>  
>> 
>> From:  xen-devel-bounces@lists.xensource.com
>> [mailto:xen-devel-bounces@lists.xensource.com]   On Behalf Of Xin,
Xiaohui
>> Sent: Friday, May 09, 2008  4:11  AM
>> To: xen-devel@lists.xensource.com
>> Subject:   [Xen-devel][PATCH] patch to support super page (2M) with  
EPT
>> 
>> Attached are the  patches to support  super page with EPT. We only
support 2M
>> size. And  shadow may still work fine  with 4K pages.
>> The patches can be split  into 3 parts. Apply order is as  attached.
>>  
>> tool.diff 
>> To  allocate 2M physical contiguous memory  in guest except the first
2M and
>> the last 2M.
>> The first 2M covers special  memory, and Xen use the last  few pages in
guest
>> memory to do special  things.
>> We let them to be 4K  pages as normal.
>> super_page_common.patch
>> To modify the p2m  interfaces by adding an order parameter, such as
>> guest_physmap_add_page(), p2m_set_entry(),   etc.
>> p2m-ept-file.patch
>>            To   handle the EPT tables to support super page.
>>  
>>  
>> Signed-off-by:   Xin Xiaohui <xiaohui.xin@intel.com>
>> Signed-off-by: Li Xin, B   <xin.b.li@intel.com>
>>  
>> 
>>  
>> 
>>  
>>  
>>  
>> 
>>  
>>  
>> 
>> _______________________________________________
>> Xen-devel   mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>>  
>>  
>>  
>>  
>> 
>>  
>>  
>> 
>> _______________________________________________
>> Xen-devel  mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>>  
>>  
> 



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

Huang2, Wei

2008-May-13 15:49 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Re-submit. It fixes the issues based on your comments.
 
Thanks,
 
-Wei

________________________________

From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
Sent: Tuesday, May 13, 2008 8:51 AM
To: Li, Xin B; Huang2, Wei; Xin, Xiaohui; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT


Exactly. The interface for populate_physmap() is clear - if you ask for order-9
allocations then that is what you must get. Otherwise the allocation fails. It
is up to the caller to retry with order-0 allocations _if_ that is a suitable
fallback.

 -- Keir

On 13/5/08 14:39, "Li, Xin B" <xin.b.li@intel.com> wrote:



	if 2M page allocation fails, the domain builer will try to use 4K allocation
instead.
	-Xin
	
	

		
		 
		
________________________________

		From: xen-devel-bounces@lists.xensource.com 
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Huang2,  Wei
		Sent: 2008年5月13日 21:37
		To: Keir Fraser; Xin, Xiaohui;  xen-devel@lists.xensource.com
		Subject: RE: [Xen-devel][PATCH] patch  to support super page (2M) with EPT
		
		 
		 
		 
		
		Memory.c  looks more invasive because it takes care of failure cases using 4KB
pages.  Xiaohui’s patch tries to allocate pages using extend_order. But if this 
request fails for any reason, the guest cannot be started anymore.
		
		
		
		-Wei
		
		
		
		 
		 
		
		From: Keir Fraser  [mailto:keir.fraser@eu.citrix.com] 
		Sent: Tuesday, May 13, 2008 3:47  AM
		To: Huang2, Wei; Xin, Xiaohui;  xen-devel@lists.xensource.com
		Subject: Re: [Xen-devel][PATCH] patch  to support super page (2M) with EPT
		
		 
		 
		Overall your  changes to common code seem a bit more invasive than in the
Intel patch. In  particular I don’t understand why you made such changes to
common/memory.c.  The other patch makes far fewer changes (and even some of
those would go away  since they have erroneously changed the populate_physmap
interface). So my  feeling is that the Intel patch is a slightly more elegant
base to start with:  extra changes that your patch makes really need to be
accounted  for.
		
		 -- Keir
		
		On 12/5/08 18:28, "Huang2, Wei"  <Wei.Huang2@amd.com> wrote:
		
		Here is  a revised version. I get rid of 4MB support, as suggested. I did not
see the  issue mentioned by Xiaohui related to splitting last 2M into 4KB pages.
But  anyway, I attached two versions for your reference. Keir, please let me
know  if you have comments.
		
		 
		-Wei
		

		
		
________________________________


		
		
		From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]  
		Sent: Monday, May 12, 2008 2:03 AM
		To: Xin, Xiaohui;  Huang2, Wei; xen-devel@lists.xensource.com
		Subject: Re:  [Xen-devel][PATCH] patch to support super page (2M) with EPT
		
		Yes,  absolutely no need for 4M page support. We do not support the 32-bit
non-PAE  build target any more.
		
		 -- Keir
		
		On 12/5/08 06:04, "Xin,  Xiaohui" <xiaohui.xin@intel.com>
wrote:
		
		Some  comments here:
		1) Basically 4M pages  allocations is not hardware  naturally for EPT, we only
use 2M super pages now.
		I remembered that  Keir said that 2M pages allocation is sufficient, and he 
removed all the  pure 32bit support already.
		2)  If we don’t allocate  the last 2M  area with 4kb pages, the EPT will meet
some problem. Xen will set  one of  the 4k page
		     there to be invalid,   logically that means we should invalid the all the
2M page if we  allocate it  with 2M, and then the
		     special pages Xen used  in the high end  of the guest memory can not be
used then. May we know how you  cope with   that?
		 
		Thanks
		Xiaohui
		 
		

		
		
________________________________


		
		
		From:   xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]   On Behalf Of Huang2, Wei
		Sent: Monday, May 12, 2008  12:36  PM
		To: Xin, Xiaohui;   xen-devel@lists.xensource.com
		Subject: RE: [Xen-devel][PATCH]  patch  to support super page (2M) with EPT
		
		This  is the latest one I created. Please review it and  I will  re-submit.
		 
		1.        It  includes the  patch for p2m-ept.c, directly from your previous
patch.
		
		2.        Xc_hvm_create.c   is based on my original approach. It includes
support for both 2MB and  4MB  pages. Also it considers the case of odd page
size (such as 255MB).  But I did  not allocate the last 2MB area using 4KB 
pages. Let me  know if it is a  big issue.
		
		3.        The  rest are  pretty similar.
		
		
		Thanks,
		 
		-Wei
		 
		
		From:  xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]   On Behalf Of Huang2, Wei
		Sent: Sunday, May 11, 2008  3:34  PM
		To: Xin, Xiaohui;   xen-devel@lists.xensource.com
		Subject: RE: [Xen-devel][PATCH]  patch  to support super page (2M) with EPT
		
		Could  we work together for a common solution? As far  as I can see, it
largely  overlaps with my super page patch. The major  difference is between
p2m.c  and  p2m-ept.c.
		 
		-Wei
		 
		
		From:  xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]   On Behalf Of Xin, Xiaohui
		Sent: Friday, May 09, 2008  4:11  AM
		To: xen-devel@lists.xensource.com
		Subject:   [Xen-devel][PATCH] patch to support super page (2M) with   EPT
		
		Attached are the  patches to support  super page with EPT. We only support 2M
size. And  shadow may still work fine  with 4K pages.
		The patches can be split  into 3 parts. Apply order is as  attached.
		 
		tool.diff 
		To  allocate 2M physical contiguous memory  in guest except the first 2M and 
the last 2M.
		The first 2M covers special  memory, and Xen use the last  few pages in guest
memory to do special  things.
		We let them to be 4K  pages as normal.
		super_page_common.patch  
		To modify the p2m  interfaces by adding an order parameter, such as  
guest_physmap_add_page(), p2m_set_entry(),   etc.
		p2m-ept-file.patch
		           To   handle the EPT tables to support super page.              
		 
		 
		Signed-off-by:   Xin Xiaohui <xiaohui.xin@intel.com>
		Signed-off-by: Li Xin, B   <xin.b.li@intel.com>
		 
		
		 
		
		 
		

		
		
________________________________


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

		
		
________________________________


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

	
	






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Keir Fraser

2008-May-14 08:40 UTC

head link

Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT

You now break the populate_physmap interface like the original Intel patch
did. You cannot change the index argument to __copy_from_guest_offset().
Also you add in a bogus printk in the same chunk of the patch.

You do not use SUPER_PAGE_ORDER anywhere, and NORMAL_PAGE_ORDER only in some
places. You may as well remove both macros.

 -- Keir

On 13/5/08 16:49, "Huang2, Wei" <Wei.Huang2@amd.com> wrote:
> Re-submit. It fixes the issues based on your comments.
>  
> Thanks,
>  
> -Wei
> 
> 
> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
> Sent: Tuesday, May 13, 2008 8:51 AM
> To: Li, Xin B; Huang2, Wei; Xin, Xiaohui; xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT
> 
> Exactly. The interface for populate_physmap() is clear — if you ask for
> order-9 allocations then that is what you must get. Otherwise the
allocation
> fails. It is up to the caller to retry with order-0 allocations _if_ that
is a
> suitable fallback.
> 
>  -- Keir
> 
> On 13/5/08 14:39, "Li, Xin B" <xin.b.li@intel.com> wrote:
> 
>> if  2M page allocation fails, the domain builer will try to use 4K
allocation
>> instead.
>> -Xin
>> 
>>  
>>> 
>>>  
>>>  
>>> 
>>>  From: xen-devel-bounces@lists.xensource.com
>>> [mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of
Huang2,  Wei
>>> Sent: 2008年5月13日  21:37
>>> To: Keir Fraser; Xin, Xiaohui;   xen-devel@lists.xensource.com
>>> Subject: RE:  [Xen-devel][PATCH] patch  to support super page (2M)
with  EPT
>>> 
>>>  
>>>  
>>>  
>>> 
>>> Memory.c  looks more invasive because it takes  care of failure
cases using
>>> 4KB pages.  Xiaohui’s patch tries to  allocate pages using
extend_order. But
>>> if this  request fails for any  reason, the guest cannot be started
anymore.
>>> 
>>> 
>>> 
>>> -Wei
>>> 
>>> 
>>> 
>>>  
>>>  
>>> 
>>> From: Keir Fraser  [mailto:keir.fraser@eu.citrix.com]
>>> Sent: Tuesday, May 13, 2008 3:47  AM
>>> To: Huang2,  Wei; Xin, Xiaohui;  xen-devel@lists.xensource.com
>>> Subject:  Re: [Xen-devel][PATCH] patch  to support super page (2M)
with  EPT
>>> 
>>>  
>>>  
>>> Overall your  changes to common code seem a bit  more invasive than
in the
>>> Intel patch. In  particular I don’t  understand why you made such
changes to
>>> common/memory.c.  The other  patch makes far fewer changes (and
even some of
>>> those would go away   since they have erroneously changed the
>>> populate_physmap interface).  So my  feeling is that the Intel
patch is a
>>> slightly more elegant base  to start with:  extra changes that your
patch
>>> makes really need to be  accounted  for.
>>> 
>>>  -- Keir
>>> 
>>> On 12/5/08 18:28, "Huang2,  Wei" 
<Wei.Huang2@amd.com> wrote:
>>> 
>>> Here is  a revised version. I get rid of 4MB  support, as
suggested. I did
>>> not see the  issue mentioned by Xiaohui  related to splitting last
2M into
>>> 4KB pages. But  anyway, I attached  two versions for your
reference. Keir,
>>> please let me know  if you have  comments.
>>> 
>>>  
>>> -Wei
>>>  
>>> 
>>>  
>>> 
>>>   
>>> 
>>> 
>>> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
>>> Sent: Monday, May 12, 2008 2:03 AM
>>> To: Xin,  Xiaohui;  Huang2, Wei; xen-devel@lists.xensource.com
>>> Subject:  Re:  [Xen-devel][PATCH] patch to support super page (2M)
with  EPT
>>> 
>>> Yes,  absolutely no need for 4M page support. We do not  support
the 32-bit
>>> non-PAE  build target any more.
>>> 
>>>  --  Keir
>>> 
>>> On 12/5/08 06:04, "Xin,  Xiaohui" 
<xiaohui.xin@intel.com> wrote:
>>> 
>>> Some  comments here:
>>> 1) Basically 4M pages   allocations is not hardware  naturally for
EPT, we
>>> only use 2M  super pages now.
>>> I remembered that  Keir said that 2M pages  allocation is
sufficient, and he
>>> removed all the  pure 32bit  support already.
>>> 2)  If we don’t allocate  the last 2M   area with 4kb pages, the
EPT will
>>> meet some problem. Xen will set   one of  the 4k page
>>>      there to be  invalid,   logically that means we should invalid
the all
>>> the 2M  page if we  allocate it  with 2M, and then the
>>>      special pages Xen used  in the  high end  of the guest memory
can not
>>> be used then. May we know how you   cope with    that?
>>>  
>>> Thanks
>>> Xiaohui
>>>  
>>>  
>>>  
>>>  
>>> 
>>>  
>>> 
>>>   
>>> 
>>> 
>>> From:    xen-devel-bounces@lists.xensource.com
>>> [mailto:xen-devel-bounces@lists.xensource.com]    On Behalf Of
Huang2, Wei
>>> Sent: Monday, May 12,  2008  12:36  PM
>>> To: Xin, Xiaohui;    xen-devel@lists.xensource.com
>>> Subject: RE:  [Xen-devel][PATCH]  patch  to support super page (2M)
with
>>> EPT
>>> 
>>> This  is the  latest one I created. Please review it and  I will
>>> re-submit.
>>>  
>>> 1.         It  includes the  patch for p2m-ept.c,  directly from
your
>>> previous patch.
>>> 
>>> 2.         Xc_hvm_create.c   is based on my original  approach. It
includes
>>> support for both 2MB and  4MB  pages. Also  it considers the case
of odd
>>> page size (such as 255MB).  But I did   not allocate the last 2MB
area using
>>> 4KB  pages. Let me   know if it is a  big issue.
>>> 
>>> 3.         The  rest are  pretty  similar.
>>> 
>>> 
>>> Thanks,
>>>  
>>> -Wei
>>>  
>>> 
>>> From:   xen-devel-bounces@lists.xensource.com
>>> [mailto:xen-devel-bounces@lists.xensource.com]    On Behalf Of
Huang2, Wei
>>> Sent: Sunday, May 11,  2008  3:34  PM
>>> To: Xin, Xiaohui;    xen-devel@lists.xensource.com
>>> Subject: RE:  [Xen-devel][PATCH]  patch  to support super page (2M)
with
>>> EPT
>>> 
>>> Could  we work  together for a common solution? As far  as I can
see, it
>>> largely   overlaps with my super page patch. The major  difference
is
>>> between p2m.c  and   p2m-ept.c.
>>>  
>>> -Wei
>>>  
>>> 
>>> From:   xen-devel-bounces@lists.xensource.com
>>> [mailto:xen-devel-bounces@lists.xensource.com]    On Behalf Of Xin,
Xiaohui
>>> Sent: Friday, May 09,  2008  4:11  AM
>>> To:  xen-devel@lists.xensource.com
>>> Subject:    [Xen-devel][PATCH] patch to support super page (2M)
with    EPT
>>> 
>>> Attached are the  patches to support   super page with EPT. We only
support
>>> 2M size. And  shadow may  still work fine  with 4K pages.
>>> The patches can be split  into  3 parts. Apply order is as 
attached.
>>>  
>>> tool.diff 
>>> To   allocate 2M physical contiguous memory  in guest except the
first  2M
>>> and  the last 2M.
>>> The first 2M covers special  memory, and  Xen use the last  few
pages in
>>> guest memory to do special   things.
>>> We let them to be 4K  pages as  normal.
>>> super_page_common.patch
>>> To modify the p2m   interfaces by adding an order parameter, such
as
>>> guest_physmap_add_page(), p2m_set_entry(),    etc.
>>> p2m-ept-file.patch
>>>            To    handle the EPT tables to support super page.
>>>  
>>>  
>>> Signed-off-by:    Xin Xiaohui <xiaohui.xin@intel.com>
>>> Signed-off-by: Li  Xin, B    <xin.b.li@intel.com>
>>>  
>>> 
>>>  
>>> 
>>>  
>>>  
>>> 
>>>  
>>> 
>>>   
>>> 
>>> 
>>> _______________________________________________
>>> Xen-devel    mailing list
>>> Xen-devel@lists.xensource.com
>>> http://lists.xensource.com/xen-devel
>>> 
>>> 
>>>  
>>> 
>>>  
>>> 
>>>   
>>> 
>>> 
>>> _______________________________________________
>>> Xen-devel   mailing list
>>> Xen-devel@lists.xensource.com
>>> http://lists.xensource.com/xen-devel
>>> 
>>>  
>> 
> 
> 



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Huang2, Wei

2008-May-14 21:22 UTC

head link

RE: [Xen-devel][PATCH] patch to support super page (2M) with EPT

Keir,
 
Here is the latest version. The changes include:
 
1. NORMAL_PAGE_ORDER and SUPER_PAGE_ORDER are removed
2. Changes to __copy_from_guest_offset() index are removed from
populate_physmap() function
3. Because of (2), a super_page_array is created and passed to
xc_domain_memory_populate_physmap() for allocating 2M pages
4. When 2M requests can not be satisfied, use 4K pages instead.
 
 
Thanks,
 
-Wei

________________________________

From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
Sent: Wednesday, May 14, 2008 3:40 AM
To: Huang2, Wei; Li, Xin B; Xin, Xiaohui; xen-devel@lists.xensource.com
Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT


You now break the populate_physmap interface like the original Intel patch did.
You cannot change the index argument to __copy_from_guest_offset(). Also you add
in a bogus printk in the same chunk of the patch.

You do not use SUPER_PAGE_ORDER anywhere, and NORMAL_PAGE_ORDER only in some
places. You may as well remove both macros.

 -- Keir

On 13/5/08 16:49, "Huang2, Wei" <Wei.Huang2@amd.com> wrote:



	Re-submit. It fixes the issues based on your comments.
	
	Thanks,
	
	-Wei
	
	
________________________________

	From: Keir Fraser [mailto:keir.fraser@eu.citrix.com] 
	Sent: Tuesday, May 13, 2008 8:51 AM
	To: Li, Xin B; Huang2, Wei; Xin, Xiaohui; xen-devel@lists.xensource.com
	Subject: Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT
	
	Exactly. The interface for populate_physmap() is clear - if you ask for order-9
allocations then that is what you must get. Otherwise the allocation fails. It
is up to the caller to retry with order-0 allocations _if_ that is a suitable
fallback.
	
	 -- Keir
	
	On 13/5/08 14:39, "Li, Xin B" <xin.b.li@intel.com> wrote:
	
	

		if  2M page allocation fails, the domain builer will try to use 4K allocation 
instead.
		-Xin
		
		 
		

			
			 
			 
			
________________________________

			From: xen-devel-bounces@lists.xensource.com  
[mailto:xen-devel-bounces@lists.xensource.com]  On Behalf Of Huang2,  Wei
			Sent: 2008年5月13日  21:37
			To: Keir Fraser; Xin, Xiaohui;   xen-devel@lists.xensource.com
			Subject: RE:  [Xen-devel][PATCH] patch  to support super page (2M) with  EPT
			
			 
			 
			 
			
			Memory.c  looks more invasive because it takes  care of failure cases using
4KB pages.  Xiaohui’s patch tries to  allocate pages using extend_order. But if
this  request fails for any  reason, the guest cannot be started anymore.
			
			
			
			-Wei
			
			
			
			 
			 
			
			From: Keir Fraser  [mailto:keir.fraser@eu.citrix.com]  
			Sent: Tuesday, May 13, 2008 3:47  AM
			To: Huang2,  Wei; Xin, Xiaohui;  xen-devel@lists.xensource.com
			Subject:  Re: [Xen-devel][PATCH] patch  to support super page (2M) with  EPT
			
			 
			 
			Overall your  changes to common code seem a bit  more invasive than in the
Intel patch. In  particular I don’t  understand why you made such changes to
common/memory.c.  The other  patch makes far fewer changes (and even some of
those would go away   since they have erroneously changed the populate_physmap
interface).  So my  feeling is that the Intel patch is a slightly more elegant
base  to start with:  extra changes that your patch makes really need to be 
accounted  for.
			
			 -- Keir
			
			On 12/5/08 18:28, "Huang2,  Wei"  <Wei.Huang2@amd.com> wrote:
			
			Here is  a revised version. I get rid of 4MB  support, as suggested. I did
not see the  issue mentioned by Xiaohui  related to splitting last 2M into 4KB
pages. But  anyway, I attached  two versions for your reference. Keir, please
let me know  if you have  comments.
			
			 
			-Wei
			

			
			 
			
________________________________

			
			
			From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]   
			Sent: Monday, May 12, 2008 2:03 AM
			To: Xin,  Xiaohui;  Huang2, Wei; xen-devel@lists.xensource.com
			Subject:  Re:  [Xen-devel][PATCH] patch to support super page (2M) with  EPT
			
			Yes,  absolutely no need for 4M page support. We do not  support the 32-bit
non-PAE  build target any more.
			
			 --  Keir
			
			On 12/5/08 06:04, "Xin,  Xiaohui"  <xiaohui.xin@intel.com>
wrote:
			
			Some  comments here:
			1) Basically 4M pages   allocations is not hardware  naturally for EPT, we
only use 2M  super pages now.
			I remembered that  Keir said that 2M pages  allocation is sufficient, and he 
removed all the  pure 32bit  support already.
			2)  If we don’t allocate  the last 2M   area with 4kb pages, the EPT will
meet some problem. Xen will set   one of  the 4k page
			     there to be  invalid,   logically that means we should invalid the all
the 2M  page if we  allocate it  with 2M, and then the
			     special pages Xen used  in the  high end  of the guest memory can not be
used then. May we know how you   cope with    that?
			 
			Thanks
			Xiaohui
			 
			

			
			 
			
________________________________

			  

			
			
			From:    xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]    On Behalf Of Huang2, Wei
			Sent: Monday, May 12,  2008  12:36  PM
			To: Xin, Xiaohui;    xen-devel@lists.xensource.com
			Subject: RE:  [Xen-devel][PATCH]  patch  to support super page (2M) with  EPT
			
			This  is the  latest one I created. Please review it and  I will   re-submit.
			 
			1.         It  includes the  patch for p2m-ept.c,  directly from your
previous patch.
			
			2.         Xc_hvm_create.c   is based on my original  approach. It includes
support for both 2MB and  4MB  pages. Also  it considers the case of odd page
size (such as 255MB).  But I did   not allocate the last 2MB area using 4KB 
pages. Let me   know if it is a  big issue.
			
			3.         The  rest are  pretty  similar.
			
			
			Thanks,
			 
			-Wei
			 
			
			From:   xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]    On Behalf Of Huang2, Wei
			Sent: Sunday, May 11,  2008  3:34  PM
			To: Xin, Xiaohui;    xen-devel@lists.xensource.com
			Subject: RE:  [Xen-devel][PATCH]  patch  to support super page (2M) with  EPT
			
			Could  we work  together for a common solution? As far  as I can see, it
largely   overlaps with my super page patch. The major  difference is  between
p2m.c  and   p2m-ept.c.
			 
			-Wei
			 
			
			From:   xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com]    On Behalf Of Xin, Xiaohui
			Sent: Friday, May 09,  2008  4:11  AM
			To:  xen-devel@lists.xensource.com
			Subject:    [Xen-devel][PATCH] patch to support super page (2M) with    EPT
			
			Attached are the  patches to support   super page with EPT. We only support
2M size. And  shadow may  still work fine  with 4K pages.
			The patches can be split  into  3 parts. Apply order is as  attached.
			 
			tool.diff 
			To   allocate 2M physical contiguous memory  in guest except the first  2M
and  the last 2M.
			The first 2M covers special  memory, and  Xen use the last  few pages in
guest memory to do special   things.
			We let them to be 4K  pages as  normal.
			super_page_common.patch  
			To modify the p2m   interfaces by adding an order parameter, such as   
guest_physmap_add_page(), p2m_set_entry(),    etc.
			p2m-ept-file.patch
			           To    handle the EPT tables to support super page.               
			 
			 
			Signed-off-by:    Xin Xiaohui <xiaohui.xin@intel.com>
			Signed-off-by: Li  Xin, B    <xin.b.li@intel.com>
			 
			
			 
			
			 
			

			
			 
			
________________________________

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

			
			 
			
________________________________

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

		
		

	
	
	






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Isaku Yamahata

2008-May-16 02:57 UTC

head link

[PATCH] trivial compilation error fix for 17645:8d18e52a1b23 (was Re: [Xen-devel][PATCH] patch to support super page (2M) with EPT)

# HG changeset patch
# User Isaku Yamahata <yamahata@valinux.co.jp>
# Date 1210906165 -32400
# Node ID 6d6e35e53f46768bda3a642dd94fff4ed9be8108
# Parent  f12724194ec6768baf865dc2d54afe646dbeac79
[IA64] trivial compilation error fix for 17645:8d18e52a1b23.

This patch fixes copilation errors cauased by c/s 17645:8d18e52a1b23.

mm.c: In function ''guest_physmap_remove_page'':
mm.c:2455: error: invalid storage class for function
''domain_page_flush_and_put''
mm.c:2451: warning: ISO C90 forbids mixed declarations and code
mm.c:2597: error: invalid storage class for function
''free_page_type''
mm.c:2601: error: invalid storage class for function
''alloc_page_type''
mm.c:2913: error: expected declaration or statement at end of input

and

xen/include/asm/shadow.h:44: error: conflicting types for guest_physmap_add_page
xen/include/asm/grant_table.h:16: error: previous declaration of
guest_physmap_add_page was here

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

diff --git a/xen/arch/ia64/xen/mm.c b/xen/arch/ia64/xen/mm.c
--- a/xen/arch/ia64/xen/mm.c
+++ b/xen/arch/ia64/xen/mm.c
@@ -2442,7 +2442,7 @@
 
     BUG_ON(mfn == 0);//XXX
 
-    for (i = 0; i < (1UL << page_order); i++) {
+    for (i = 0; i < (1UL << page_order); i++)
         zap_domain_page_one(d, (gpfn+i) << PAGE_SHIFT, 0, mfn+i);
 
     perfc_incr(guest_physmap_remove_page);
diff --git a/xen/include/asm-ia64/grant_table.h
b/xen/include/asm-ia64/grant_table.h
--- a/xen/include/asm-ia64/grant_table.h
+++ b/xen/include/asm-ia64/grant_table.h
@@ -13,7 +13,7 @@
 int replace_grant_host_mapping(unsigned long gpaddr, unsigned long mfn,
unsigned long new_gpaddr, unsigned int flags);
 
 // for grant transfer
-int guest_physmap_add_page(struct domain *d, unsigned long gpfn, unsigned long
mfn, int order);
+int guest_physmap_add_page(struct domain *d, unsigned long gpfn, unsigned long
mfn, unsigned int page_order);
 
 /* XXX
  * somewhere appropriate


-- 
yamahata


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