Displaying 20 results from an estimated 3000 matches similar to: "[Question] How to support page offline in Xen environment"
2009 Aug 26
6
can dom0 modify Shadow PT of HVM domU?
Hi all,
Can Xen hypervisor modify HVM domU's Shadow page table, under the dom0's context, like trapped from dom0's hypercall?
I think it have to call 2 functions at least: guest_walk_tables() and flush_tlb_all(). Can these 2 functions called in dom0's context?
In my test, if hypervisor tries to modify HVM's shadow page table, it will bring down the whole system. I am not
2008 Dec 11
4
paging and shadow paging in xen: trying to implement split memory
Hi all,
I''ve been reading through the code regarding paging --> spending a lot of
time in mm/*.*, as well as some of the other parts up a level or two, but
I''m still unclear as to some key things.
Here''s what I think I know:
I think I know how a domain''s shadow page table is first allocated E.G. the
hash_table is xmalloc''ed and when it is
2007 Jun 28
5
One question on MMIO
In sh_page_fault(), there are some code like following, why we think it
is mmio only when paging_vcpu_mode_translate(v)?
Thanks
Yunhong Jiang
/* What mfn is the guest trying to access? */
gfn = guest_l1e_get_gfn(gw.eff_l1e);
gmfn = vcpu_gfn_to_mfn(v, gfn);
mmio = (is_hvm_domain(d)
&& paging_vcpu_mode_translate(v)
&&
2008 Sep 03
1
[PATCH] Fix guest_handle_okay/guest_handle_subrange_okay
The guest handle checks should use paging_* predicates, not shadow_*.
Also tidy up a few places where p2m definitions were being imported
via asm/guest_access.h -> asm/shadow.h -> asm/p2m.h
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
--
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]
2008 May 30
2
relationship of the auto_translated_physmap feature and the shadow_mode_translate mode of domain
2008 Jul 24
1
doubt on phys_to_machine_mapping
Hi all,
Can some one tell me where phys_to_machine_mapping is being
initialized for a domU having paging mode set to PG_translate.
I see that, populate_physmap() after calling __alloc_xen_heap_pages only
updates the machine_to_physmap but how is the mfn for the allocated page
being updated/set for phys_to_machine_mapping??
I see that phys_to_machine_mapping is a #defined to RO_MPT_VIRT_START
2009 Oct 23
11
soft lockups during live migrate..
Trying to migrate a 64bit PV guest with 64GB running medium to heavy load
on xen 3.4.0, it is showing lot of soft lockups. The softlockups are
causing dom0 reboot by the cluster FS. The hardware has 256GB and 32
CPUs.
Looking into the hypervisor thru kdb, I see one cpu in sh_resync_all()
while all other 31 appear spinning on the shadow_lock. I vaguely remember
seeing some thread on this while
2011 Jun 27
20
[PATCH 0 of 5] v2: Nested-p2m cleanups and locking changes
This patch series tidies up a few bits ofthe nested p2m code.
The main thing it does is reorganize the locking so that most of the
changes to nested p2m tables happen only under the p2m lock, and the
nestedp2m lock is only needed to reassign p2m tables to new cr3 values.
Changes since v1:
- a few minor fixes
- more sensible flushing policy in p2m_get_nestedp2m()
- smoke-tested this time!
2011 Mar 15
6
[PATCH] ept: Fix bug in changeset 22526:7a5ee3800417
This fixes a bug in changeset 22526:7a5ee3800417, where the wrong
value is read when deciding whether to flush the VTd tables. The
effect is minor: in situations where the p2m entry is changed but the
mfn is the same, the VTd tables will be unnecessarily flushed.
old_entry is left untouched in the second case, since having a present
old_entry will cause the an unnecessary check to be taken at
2011 Jan 17
8
[PATCH 0 of 3] Miscellaneous populate-on-demand bugs
This patch series includes a series of bugs related to p2m, ept, and
PoD code which were found as part of our XenServer product testing.
Each of these fixes actual bugs, and the 3.4-based version of the patch
has been tested thoroughly. (There may be bugs in porting the patches,
but most of them are simple enough as to make it unlikely.)
Each patch is conceptually independent, so they can each
2010 Jan 30
20
"Iomem mapping not permitted" during windows crash dump under GPLPV
I''ve recently noticed that my windows crash dumps fail at around 40-50%
under GPLPV. ''xm dmesg'' shows the following:
(XEN) grant_table.c:350:d0 Iomem mapping not permitted ffffffffffffffff
(domain 865)
At first I thought that the cause was just a bug in my grant ref code
but it just occurred to me that this could be happening when Windows
tries to write out the
2008 Nov 24
4
EPT walks for guest page table
Hi,
I am really confused about NPT walks for guest page table , and eager to
know the details about it.
It is treated as data writes even if the access itself is a code read in
AMD NPT.I just want to know : is it the same in EPT?
Could anyone help me? I would like to know that very much
Thank you in advance
Bo Ma
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2011 Jul 30
22
[bug] ''VT-d 1G super page'' feature is blocked
Hi Tim,
Could you please have a look at this bug? Thanks a lot.
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1774
Best Regards,
Yongjie Ren (Jay)
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2008 Dec 15
8
[PATCH 0/2] MCA support with page offlining
Hi all,
I had posted about MCA support for Intel64 before. It had only a
function to log the MCA error data received from hypervisor.
http://lists.xensource.com/archives/html/xen-devel/2008-09/msg00876.html
I attach patches that support not only error logging but also Page
Offlining function. The page where an MCA occurs will offline and not
reuse. A new flag ''PGC_reserved''
2008 Nov 20
10
issues with movnti emulation
We''ve got reports of that change causing HVM data corruption issues. While
I can''t see what''s wrong with the patch, I''d suggest at least reverting it from
the 3.3 tree (which is what our code is based upon) for the time being.
Jan
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2011 May 06
14
[PATCH 0 of 4] Use superpages on restore/migrate
This patch series restores the use of superpages when restoring or
migrating a VM, while retaining efficient batching of 4k pages when
superpages are not appropriate or available.
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
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2008 Dec 19
3
xc_translate_foreign_address() returns mfn??
Hi,
I looked at the function xc_translate_foreign_address(), and see that
it walks the page table of the guest VM. So at best, it should return
the pfn of the guest (?)
We can see taht the Later part of the function is like this:
...
if (pt_levels >= 3)
mfn = (pte & L0_PAGETABLE_MASK_PAE) >> PAGE_SHIFT;
else
mfn = (pte & L0_PAGETABLE_MASK)
2011 Mar 25
2
[RFC PATCH 2/3] AMD IOMMU: Implement p2m sharing
--
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Sitz: Dornach, Gemeinde Aschheim,
Landkreis München Registergericht München,
HRB Nr. 43632
WEEE-Reg-Nr: DE 12919551
Geschäftsführer:
Alberto Bozzo, Andrew Bowd
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2008 Jul 02
3
Unable to switch input to xen from serial console
Hi all,
When i do ''xm dmesg'' the last statement says "*** Serial input ->
DOM0 (type ''CTRL-a'' three times to switch input to Xen)" (i have no clue
what''s that supposed to mean??) But when i press ctrl-a three times at
the serial console, nothing happens.
Iam using minicom to connect to the serial port of xen machine. Once
xen
2008 Feb 21
2
[PATCH][RFC]Remove lock on first guest table walk
Just found this patch in house which I thought sent out
already. :-)
Still one thing remaining is to special case for UP guest
which suffers overhead from this change...
----
Remove lock on first guest table walk
Existing shadow fault path grabs big lock before walking
guest tables, to ensure consistency with shadow content
lest concurrent change from other vcpu in a bad OS.
But this lock