This patch add ability to test /proc/cpuinfo data
we're interested in at the moment.

The code provides the following functionality

 - cpu_init, to parse cpuinfo and check if the
   host cpu we're running on is suitable enough
   for FPU checkpoint/restore. If FPU present then
   there must be at least fxsave capability present

 - cpu_set_feature/cpu_has_feature helpers which
   provides to test certain bits and set them where
   needed (we need to set bits when parse cpuinfo)

Note, we reserve space for all cpuinfo bits known
by the kernel at moment, while use only three FPU
related bits for a while. This is done because we might
need to use or find out other features in future.

After all it's just 40 bytes of memory needed to keep
all possible bits.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We will need these structures for restore FPU
state via sigframe, as as we decode data provided
by ptrace.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

A name of a unix socket should be uniq
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since we send _fd_ it's pointless to call chmod on image file.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Wrong size was used in mapping and unmapping. But since
they are more-less close to each other, nobody noticed it.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Syntax is

crtools exec -t <pid> <syscall_name> [<arguments>]

Two types of arguments are supported -- plain, treated
as number, passed as is to the syscall. Buffer, started
with '&' -- the rest of the string is pushed to the tgt
task's memory and pointer to one is passed as syscall
argument.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Reserve the cmdline option for this and link empty file.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The fist part prepares ctl to controll the seized task.
The 2nd one mmaps shareb buffer for data exchange.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This one calls a syscon on seized task. Existing mmap/munmap
just use one.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Will be used by other code.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

I'll include it into a place, that knows nothing about
pb types. Use generic pointer instead.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We'll have to generate syscall table in another form,
prepare for it
.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is mostly bugfix and improvements release.
Nonetheless, some new features exists, the most interesting are:

  * proper COW mappings handling
  * full packet sockets support, thus supporting the tcpdump tool
  * the --shell-job option, which makes it possible to dump apps
    launched from one shell and restore them in another

Some features are available with the custome kernel, but the good
news is that now _all_ of the patches we need are in one of the
-next trees or in the -mm one, and thus have good chances to get
merged in 3.8 (or soon after it).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We need to test every even index (which represents a slave
peer) thus use modulo operation here.
Reported-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

No spaces between chars and no 0x-s.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

IPC shared memory data is aligned by 32 bits.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The dedicated prepare_and_sigreturn makes code harder to read.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We have 3 calls for that, two called directly from cr-restore,
one -- from one the former. Clean this mess and write short
comments on each stage.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Use direct name assignment, it's enough.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This thing on pstre_item was created to carry task-specific
information across the "restore" code-flow.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The error handling was not obvious. Clean it up.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The watch target might be a deleted file. In this case we can't
re-create it on restore procedure.

A typical scenario
------------------

 fd = inotify_init1()
 wd = open(path)
 inotify_add_watch(path)
 unlink(path)
 ... checkpoint ...

here we have a @path which is unlinked but still present in inotify
watch list because inode is not yet freed. And if the program is killed
after checkpoint the last reference to a path get eliminated and inode
get freed from the kernel memory.

Thus any furher attempts to open the path via file handle (note that file
handle can't be used to create new file, the kernel doesn't permit that)
will simply fail.

So if plain opening via file handle failed we assume that at least
the file might be in our ghost files list (we're optimists, right?)
and if we successed we simply use a path generated by ghost file
engine for us.

v2 [by xemul@]:
 - gather reference to ghost file remap early
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Because we need to lookup for ghost files from
inotify system where we only have device/inode
as a key, we save dev/ino in ghost image entry.

Note we use in-kernel format for device to be
consistent with inotify and mount related
code base.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The remap_put will be needed to defer unlinking of ghost files
if they are referred from inotify system.

The lookup_remap is needed to figure out if the watch
target the inotify has present in ghost files list.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We will need to use it in inotify code.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

No need in function-wide fd variable for copying file.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>