This patch support exchange a page for a suspended PV guest from user
space.
The basic idea to offline a page is:
1) mark a page offline pending
2) If the page is owned by a HVM domain, user have to live migrate it.
In future, with stub-domain support, we can also exchange the page
without migration.
3) If the page is owned by a PV domain, we will try to exchange the
offline pending page to a new one and free the old page.
This patch achieves item 3.
The method to exchange the offline pending page for PV domain is:
1) Suspend the guest.
2) If the page is being granted out, return with offline pending.
3) Get a copy for the content
4) Scan all page table page to see if any reference to the offending
page, if yes, make the entry to be non-present to reduce the reference
count.
5) After update all page tables, user space tools will try to exchange
the old page. If the new mfn has no reference anymore (i.e.
count_info & count_mask =3D 1), the exchange will allocate a new page,
update the m2p and return success, otherwise it will return fail.
6) If step 5 is success, user space tools will update the content of
the new page change the p2m table, and change all entries scaned in
step 4 to point to new entry.
if step failed, it will try to undo step 4 to revert page table.
7) Resume the guest.
Please refer to thread in
http://www.mailinglistarchive.com/xen-devel@lists.xensource.com/msg63084.html
for more information.
Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com>
This patch firstly change the xc_core_arch_map_p2m() to map the p2m to
be writable, then it export this function.
One notice for this patch is, caller should make sure change the p2m
in flight will not cause trouble.
Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com>
This patch fixes the following error.
ia64/xc_ia64_linux_restore.c:546: error: conflicting types for
xc_domain_restore
./xenguest.h:49: error: previous declaration of xc_domain_restore was
here
make[4]: *** [ia64/xc_ia64_linux_restore.o] Error 1
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Tmem, when called from a tmem-capable (paravirtualized) guest, makes
use of otherwise unutilized ("fallow") memory to create and manage
pools of pages that can be accessed from the guest either as
"ephemeral" pages or as "persistent" pages. In either case, the pages
are not directly addressible by the guest, only copied to and fro via
the tmem interface. Ephemeral pages are a nice place for a guest to
put recently evicted clean pages that it might need again; these pages
can be reclaimed synchronously by Xen for other guests or other uses.
Persistent pages are a nice place for a guest to put "swap" pages to
avoid sending them to disk. These pages retain data as long as the
guest lives, but count against the guest memory allocation.
Tmem pages may optionally be compressed and, in certain cases, can be
shared between guests. Tmem also handles concurrency nicely and
provides limited QoS settings to combat malicious DoS attempts.
Save/restore and live migration support is not yet provided.
Tmem is primarily targeted for an x86 64-bit hypervisor. On a 32-bit
x86 hypervisor, it has limited functionality and testing due to
limitations of the xen heap. Nearly all of tmem is
architecture-independent; three routines remain to be ported to ia64
and it should work on that architecture too. It is also structured to
be portable to non-Xen environments.
Tmem defaults off (for now) and must be enabled with a "tmem" xen boot
option (and does nothing unless a tmem-capable guest is running). The
"tmem_compress" boot option enables compression which takes about 10x
more CPU but approximately doubles the number of pages that can be
stored.
Tmem can be controlled via several "xm" commands and many interesting
tmem statistics can be obtained. A README and internal specification
will follow, but lots of useful prose about tmem, as well as Linux
patches, can be found at http://oss.oracle.com/projects/tmem .
Signed-off-by: Dan Magenheimer <dan.magenheimer@oracle.com>
This patch adds the option "superpages" to the domain configuration
file. If it is set, the domain is populated using 2M pages.
This code does not support fallback to small pages. If the domain can
not be created with 2M pages, the create will fail.
The patch also includes support for saving and restoring domains with
the superpage flag set. However, if a domain has freed small pages
within its physical page array and then extended the array, the
restore will fill in those freed pages. It will then attempt to
allocate more than its memory limit and will fail. This is
significant because apparently Linux does this during boot, thus a
freshly booted Linux image can not be saved and restored successfully.
Signed-off-by: Dave McCracken <dcm@mccr.org>
guest pfn width
(i.e. 32on64 domain 0 and 64 bit guest domain).
Otherwise P2M entries which were INVALID_P2M_ENTRY
(==0xffffffffffffffff) become 0xffffffff after a migrate.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
The suspend event channel functions are arch independent code
which xc_save uses.
The changeset of 19382:a5f497f02e34 cause link error on ia64.
This patch moves the functions into arch common file from
x86 specific file xc_domain_save.c
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Current scheduler only care performance, thus always picks pCPU from
the most idle package. This knob provides another option to pick pCPU from
least idle package, for user who want performance power balance.
Signed-off-by: Yu Ke <ke.yu@intel.com>
Signed-off-by: Tian Kevin <kevin.tian@intel.com>
Calculate cpu actual average freq according to aperf and mperf MSR and
then deliver to libxc interface
Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
CPU topology info is necessary for power management analysis. For
example, to analysis the effect of Px state coordination, Cx
package/core coordination, the thread/core/socket topology
information is needed.
This patch add new command "get-cpu-topology" in xenpm to print the
CPU topology info:
Signed-off-by: Yu Ke <ke.yu@intel.com>
The code was attempting to use the domain's current number of pages
(info.nr_pages) as a maximum index. We then walk the memory map and
can easily over-write past the end of the nr_pages-sized array, if the
domain has more pages mapped in than earlier (live dump). Restrict
ourselves to the current number of pages.
Also fix the dump core method in xend to actually implement the crash
and live options. In particular this means that xend clients other
than xm now get non-live dumps by default.
Signed-off-by: John Levon <john.levon@sun.com>
guests to use it (by setting cr4.OSXSAVE).
This prevents crashes in pvops kernels, as new versions of Linux
try to use this feature.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
Add a new parameter to DOMCTL_bind_pt_irq to allow Xen to know the
guest physical address of MSI-X table. Also add a new MMIO intercept
handler to intercept that gpa in order to handle MSI-X vector mask
bit operation in the hypervisor. This reduces the load of device model
considerably if the guest does mask and unmask frequently
Signed-off-by: Qing He <qing.he@intel.com>
There are some bugs in PTRACE_PEEK/POKE.
- can't track 2MB pages in 32bit pae mode.
- leakage of mmap/munmap.
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
This includes making the pagetable walker in xc_pagetab.c behave
correctly for 32-bit and 64-bit HVM guests.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
In c/s 19009 an incompatible change was made to the ABI of libelf-*,
which are included in libxenctrl and libxenguest. To avoid client
programs (such as python/lowlevel/xc/xc.so) picking up a wrong
version and perhaps crashing, the soname should be changed.
I have chosen the version number 3.4 as xen-unstable is currently the
pre-3.4 branch. I assume we don't care about API/ABI stability within
an unstable branch.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
This patch fixes the following compilation error adjusting
function prototypes.
> xc_core_ia64.c:176: error: conflicting types for
'xc_core_arch_memory_map_get'
> xc_core.h:141: error: previous declaration of
'xc_core_arch_memory_map_get' was here
> xc_core_ia64.c:241: error: conflicting types for
'xc_core_arch_map_p2m'
> xc_core.h:144: error: previous declaration of 'xc_core_arch_map_p2m'
was here
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
This patch allows core-dumping to work on a cross-bit host/guest
configuration, whereas previously that was not supported. It supports
both PV and FV guests. The core file format generated by the host,
needs to match that of the guest, so an alignment issue is addressed,
along with the p2m frame list handling being done according to the
guest size.
Signed-off-by: Bruce Rogers <brogers@novell.com>
Never used by a guest OS (except in IA64 hcall translation layer) and
obsoleted in the tools for ages. Recent usage by qemu-dm is now
removed.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
* enables linear framebuffer and VBE 3.0 extensions.
* add a number of new resolutions, up to 2560x1600, and including
* widescreen modes common to modern displays.
* Introduce configurable video ram size through the "videoram" config
* file option, shrinking default video ram used to 4 Megs (thus
* eliminating 4 wasted megs/VM that have been the case until now), but
* allowing users to specify up to 16 Megs of vram, to support the
* extreme high resolutions such as 2560x1600x32.
Signed-off-by: Trolle Selander <trolle.selander@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
If you use -MMD -MF then the correct .o filename is written to the
.*.d file as the compiler driver arranges everything. This was done
in 19010:275abe1c5d24 for the hypervisor.
In this patch we do the same elsewhere in the xen-unstable tree,
particularly tools/. Specifically:
* Change tools/Rules.mk to add -MMD -MF ... to CFLAGS and set DEPS.
* Remove -Wp,-MD... from every other Makefile
* Remove setting of DEPS from every other Makefile
* Ensure that every Makefile says -include $(DEPS)
* Ensure that every Makefile's clean target removes $(DEPS)
Some Makefiles were already halfway there, but often for a different
variable name eg PROG_DEP. The variable name is now standardised in
Rules.mk as DEPS.
I have done a test build with this change, on Debian etch.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
hvm_info_table to describe memory parameters in a simpler form from
domain builder to hvmloader.
Also move reserved special page mappings immediately below the 4GB
boundary.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
The patch adds a new type of pt_irq: PT_IRQ_TYPE_MSI_TRANSLATE.
With it, guest dpci irq can now use msi as the underlying pirq
while injected as INTx irq.
Signed-off-by: Qing He <qing.he@intel.com>
This patch defines ia64 xc_hvm_build_target_mem() which
is referenced by xc.c.
Without this patch, xend doesn't boot complaining
that symbol, xc_hvm_build_target_mem, is missing.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
(32-bit) HVM guests. 64-bit HVM guests are still not supported for
now, pending a sensible way of getting at the guest's EFER.LMA.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
Implement libxc interface to PoD functionality:
* Add xc_hvm_build_target_mem(), which takes both memsize and target.
Memsize is the total memory, allocated in PoD pages and reported in
the e820; target is the size of the cache. If these are the same, the
normal funcitonality is called. (So you can use the same function to
build always, and it will decide whether to use PoD or not.)
* Add xc_domain_memory_[gs]et_pod_target(), which sets and/or returns
information about the PoD cache and p2m entries.
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
ia64 linux 2.6.18 only use ar.itc for local ticks so that
ar.itc didn't need paravirtualization and it can be work arounded
when save/restore.
However recent ia64 linux uses ar.itc for sched_clock() and
CONFIG_VIRT_CPU_ACCOUNTING and other issues. So ar.itc needs
paravirtualization. Although Most part is done in guest OS,
save/restore needs hypervisor support.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Keir Fraser
Isaku Yamahata