flight 174570 xen-4.13-testing real [real]
flight 174579 xen-4.13-testing real-retest [real]
http://logs.test-lab.xenproject.org/osstest/logs/174570/
http://logs.test-lab.xenproject.org/osstest/logs/174579/
Failures :-/ but no regressions.
Tests which are failing intermittently (not blocking):
t
On 01.11.22 17:43, Andrew Cooper wrote:
On 01/11/2022 15:28, Juergen Gross wrote:
XEN_LIB_STORED is serving no real purpose, as it is a mount point for
a tmpfs, so it can be replaced easily by XEN_RUN_STORED.
XENSTORED_ROOTDIR is basically unused already, there is just a single
reference in xs_
Hi Julien and Jan,
> -Original Message-
> > > Somewhat related. When should we branch for the release and set
> > > CONFIG_DEBUG=n?
> > >
> > > I think we would at least need a RC with CONFIG_DEBUG=n but IIUC we
> > > usually do it at a point where the tree is nearly frozen.
> > >
> > > AF
Hi Andrew,
> -Original Message-
> From: Andrew Cooper
> Subject: Re: [PATCH 01/20] tools/xenstore: remove XEN_LIB_STORED and
> XENSTORED_ROOTDIR
>
> On 01/11/2022 15:28, Juergen Gross wrote:
> > XEN_LIB_STORED is serving no real purpose, as it is a mount point for
> > a tmpfs, so it can
flight 174572 xen-4.15-testing real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174572/
Failures :-/ but no regressions.
Tests which did not succeed, but are not blocking:
test-amd64-amd64-xl-qemuu-win7-amd64 19 guest-stopfail like 174555
test-amd64-amd64-xl-qemut-win7-a
flight 174568 xen-4.16-testing real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174568/
Failures :-/ but no regressions.
Tests which did not succeed, but are not blocking:
test-armhf-armhf-libvirt 16 saverestore-support-check fail blocked in 174553
test-amd64-amd64-xl-qemut-win7-a
flight 174566 linux-linus real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174566/
Regressions :-(
Tests which did not succeed and are blocking,
including tests which could not be run:
test-arm64-arm64-xl-vhd 8 xen-boot fail REGR. vs. 173462
test-arm64-arm64-xl
On 11/1/22 5:14 PM, Christophe JAILLET wrote:
strtobool() is the same as kstrtobool().
However, the latter is more used within the kernel.
In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.
While at it, include the corresponding header file ()
strtobool() is the same as kstrtobool().
However, the latter is more used within the kernel.
In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.
While at it, include the corresponding header file ()
Signed-off-by: Christophe JAILLET
---
This patch
On Tue, Nov 01, 2022 at 04:30:31PM +, Bertrand Marquis wrote:
>
> > On 1 Nov 2022, at 15:01, Elliott Mitchell wrote:
> >
> > On Mon, Oct 31, 2022 at 01:26:44PM +, Bertrand Marquis wrote:
> >>
> >>> On 30 Oct 2022, at 21:14, Stefano Stabellini
> >>> wrote:
> >>>
> >>> Ideally this wou
flight 174569 ovmf real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174569/
Perfect :-)
All tests in this flight passed as required
version targeted for testing:
ovmf 85dba961c761021755cd2aa6bc98b8e789f751ef
baseline version:
ovmf 720c25ab41400f9a3dfd0
flight 174567 xen-unstable-smoke real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174567/
Failures :-/ but no regressions.
Tests which did not succeed, but are not blocking:
test-arm64-arm64-xl-xsm 15 migrate-support-checkfail never pass
test-arm64-arm64-xl-xsm 1
Pau has performed some performance tests by booting 1000 mirage
unikernels test VMs and shutting them down.
We've noticed on the flamegraphs that a lot of time is spent in Xenctrl
`domain_getinfolist`, 17.7% of overall time
(This needs to be multiplied by 16 because Dom0 100% usage = 16 vCPUs)
In p
The support limit of XAPI is 1000, so using 1024 will very likely get
everything in one go.
Other code in Xen also uses chunk sizes of 256 or 1024, and would be
much better than 2, especially now that list construction is more
efficient.
Xenopsd should also use `domain_getinfo` instead of `domain_
On a host with ~1000 VMs (the support limit for XAPI) domain_getinfolist
took O(n^2) time (n=number of domains).
This couples with xenopsd making inefficient calls to
domain_getinfolist(1 call/VM) resulted in visibly bad performance of
XAPI.
It was calling the Xen domainfolist hypercall N/2 times.
On 01/11/2022 15:28, Juergen Gross wrote:
> XEN_LIB_STORED is serving no real purpose, as it is a mount point for
> a tmpfs, so it can be replaced easily by XEN_RUN_STORED.
>
> XENSTORED_ROOTDIR is basically unused already, there is just a single
> reference in xs_daemon_rootdir() with a fallback t
Hi Elliot,
> On 1 Nov 2022, at 15:01, Elliott Mitchell wrote:
>
> On Mon, Oct 31, 2022 at 01:26:44PM +, Bertrand Marquis wrote:
>>
>>> On 30 Oct 2022, at 21:14, Stefano Stabellini wrote:
>>>
>>> Ideally this would be something quick that can be easily invoked as the
>>> first step of an e
The TODO file is not really helpful any longer. It contains only
entries which no longer apply or it is unknown what they are meant
for ("Dynamic/supply nodes", "Remove assumption that rename doesn't
fail").
Signed-off-by: Juergen Gross
---
tools/xenstore/TODO | 10 --
1 file changed, 10
In order to prepare the replacement of TDB with direct accessible nodes
in memory, remove the support for a file backed data base.
This allows to remove xs_tdb_dump, too.
Signed-off-by: Juergen Gross
---
tools/xenstore/Makefile | 5 +-
tools/xenstore/xenstored_core.c | 18 ++-
tool
xs_daemon_tdb() in xs_lib.c is no longer used at all, so it can be
removed. xs_domain_dev() is not used by xenstored, so it can be moved
to tools/libs/store/xs.c.
Move functions used by xenstore-client only to xenstore_client.c.
Signed-off-by: Juergen Gross
---
tools/libs/store/xs.c
struct watch contains an used struct list_head events. Remove it.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_watch.c | 5 -
1 file changed, 5 deletions(-)
diff --git a/tools/xenstore/xenstored_watch.c b/tools/xenstore/xenstored_watch.c
index ca0194966e..0078c60f32 100644
---
There is no need to keep struct wrl_timestampt, as it serves the same
purpose as the more simple time base provided by get_now().
Move some more stuff from xenstored_domain.h into xenstored_domain.c
as it is being used nowhere else.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core
Some wrl_*() functions are only used in xenstored_domain.c, so make
them static. In order to avoid the need of forward declarations, move
the whole function block to the start of the file.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_domain.c | 456 +++---
to
The maxrequests, node size, number of node permissions, and path length
quota are a little bit special, as they are either active in
transactions only (maxrequests), or they are just per item instead of
count values. Nevertheless being able to know the maximum number of
those quota related values p
Today hashtable_insert() returns 0 in case of an error. Change that to
let it return an errno value in the error case and 0 in case of success.
Even if not used today, do the same switch for the return value of
hashtable_expand().
Signed-off-by: Juergen Gross
---
tools/xenstore/hashtable.c
Instead of having individual quota variables switch to a table based
approach like the generic accounting. Include all the related data in
the same table and add accessor functions.
This enables to use the command line --quota parameter for setting all
possible quota values, keeping the previous p
The minsize parameter of create_hashtable() doesn't have any real use
case for Xenstore, so drop it.
For better talloc_report_full() diagnostic output add a name parameter
to create_hashtable().
Signed-off-by: Juergen Gross
---
tools/xenstore/hashtable.c| 24
to
As transaction accounting is active for unprivileged domains only, it
can easily be added to the generic per-domain accounting.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c| 3 +--
tools/xenstore/xenstored_core.h| 1 -
tools/xenstore/xenstored_domain.c
Do the following cleanups:
- hashtable_count() isn't used at all, so remove it
- replace prime_table_length and max_load_factor with macros
- make hash() static
- add a loadlimit() helper function
- remove the /***/ lines between functions
- do some style corrections
Signed-off-by: Juergen Gross
Add a new trace switch "tdb" and the related trace calls.
The "tdb" switch is off per default.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c| 8 +++-
tools/xenstore/xenstored_core.h| 6 ++
tools/xenstore/xenstored_transaction.c | 7 ++-
3 files cha
Some more cleanups of Xenstore.
Based on top of the previous 2 Xenstore series "tools/xenstore: do some
cleanup and fixes" and the accounting rework series (sorry for the
cut off series header).
Juergen Gross (10):
tools/xenstore: verify command line parameters better
tools/xenstore: do some
Add saving the maximum values of the different accounting data seen
per domain and (for unprivileged domains) globally, and print those
values via the xenstore-control quota command. Add a sub-command for
resetting the global maximum values seen.
This should help for a decision how to set the rela
Add some more verification of command line parameters.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 19 +--
1 file changed, 9 insertions(+), 10 deletions(-)
diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index ae1ea29b80..714
Add a new trace switch "acc" and the related trace calls.
The "acc" switch is off per default.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 2 +-
tools/xenstore/xenstored_core.h | 1 +
tools/xenstore/xenstored_domain.c | 10 ++
3 files changed, 12 insertions(
In order to enable switching memory accounting to the generic array
based accounting, add the current connection to the parameters of
domain_memory_add().
This requires to add the connection to some other functions, too.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 28 ++
Add the accounting of per-domain usage of Xenstore memory, watches, and
outstanding requests to the array based mechanism.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 8 +--
tools/xenstore/xenstored_domain.c | 111 +++---
tools/xenstore/xenstore
Add the node accounting to the accounting information buffering in
order to avoid having to undo it in case of failure.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 21 ++---
tools/xenstore/xenstored_domain.h | 4 ++--
2 files changed, 4 insertions(+), 21
Introduce the scheme of an accounting data array for per-domain
accounting data and use it initially for the number of nodes owned by
a domain.
Make the accounting data type to be unsigned int, as no data is allowed
to be negative at any time.
Signed-off-by: Juergen Gross
---
tools/xenstore/xen
Instead of modifying accounting data and undo those modifications in
case of an error during further processing, add a framework for
collecting the needed changes and commit them only when the whole
operation has succeeded.
This scheme can reuse large parts of the per transaction accounting.
The c
In order to prepare keeping accounting data in an array instead of
using independent fields, switch the struct changed_domain accounting
data to that scheme, for now only using an array with one element.
In order to be able to extend this scheme add the needed indexing enum
to xenstored_domain.h.
This series reworks the Xenstore internal accounting to use a uniform
generic framework. It is adding some additional useful diagnostic
information, like accounting trace and max. per-domain and global quota
values seen.
This series is based on top of the series "tools/xenstore: do some
cleanup an
Instead of using malloc() and friends, let the hashtable implementation
use the talloc framework.
Signed-off-by: Juergen Gross
---
tools/xenstore/hashtable.c| 86 ---
tools/xenstore/hashtable.h| 3 +-
tools/xenstore/xenstored_core.c | 5 +-
tools/x
Instead of special casing the permission handling and watch event
firing for the special watch paths "@introduceDomain" and
"@releaseDomain", use static dummy nodes added to the data base when
starting Xenstore.
This allows to simplify quite some code.
Note that this requires to rework the calls
Move all code related to struct changed_domain from
xenstored_transaction.c to xenstored_domain.c.
This will be needed later in order to simplify the accounting data
updates in cases of errors during a request.
Split the code to have a more generic base framework.
Signed-off-by: Juergen Gross
-
Instead of returning 0 or 1 let chk_domain_generation() return a
boolean value.
Simplify the only caller by removing the ret variable.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_domain.c | 18 --
1 file changed, 8 insertions(+), 10 deletions(-)
diff --git a/tools
Today it is possible to set a flag when calling hashtable_destroy() in
order to specify whether the data associated with the hashtable entries
should be freed or not. The keys of the entries will always be freed.
Change that by replacing the flag of hashtable_destroy() by two flags
for create_hash
Make the xenstored internal trace configurable by adding classes
which can be switched on and off independently from each other.
Define the following classes:
- obj: Creation and deletion of interesting "objects" (watch,
transaction, connection)
- io: incoming requests and outgoing responses
-
clang is complaining about a NULL dereference for constructs like:
domain_is_unprivileged(conn) ? conn->in : NULL
as it can't know that domain_is_unprivileged(conn) will return false
if conn is NULL.
Fix that by making domain_is_unprivileged() an inline function (and
related to that domid_is_u
The accounting for the number of nodes of a domain in an active
transaction is not working correctly, as it allows to create arbitrary
number of nodes. The transaction will finally fail due to exceeding
the number of nodes quota, but before closing the transaction an
unprivileged guest could cause
Today check_store() is only testing the correctness of the node tree.
Add verification of the accounting data (number of nodes) and correct
the data if it is wrong.
Do the initial check_store() call only after Xenstore entries of a
live update have been read.
Signed-off-by: Juergen Gross
---
Move the definition of the log() macro to xenstored_core.h in order
to make it usable from other source files, too.
While at it preserve errno from being modified.
Signed-off-by: Juergen Gross
---
V2:
- preserve errno (Julien Grall)
---
tools/xenstore/xenstored_core.c | 14 --
tools
Rework the interface and the internals of the per-domain node
accounting:
- rename the functions to domain_nbentry_*() in order to better match
the related counter name
- switch from node pointer to domid as interface, as all nodes have the
owner filled in
- use a common internal function fo
Instead of storing a pointer to the path which is prepended to
relative paths in struct watch, just use the length of the prepended
path.
It should be noted that the now removed special case of the
relative path being "" in get_watch_path() can't happen at all.
Signed-off-by: Juergen Gross
---
There are some places left where dom0 is associated with domid 0.
Use dom0_domid instead.
Signed-off-by: Juergen Gross
---
V2:
- new patch
---
tools/xenstore/xenstored_core.c | 5 +++--
tools/xenstore/xenstored_domain.c | 8
2 files changed, 7 insertions(+), 6 deletions(-)
diff --gi
Today finding a struct domain by its domain id requires to scan the
list of domains until finding the correct domid.
Add a hashlist for being able to speed this up. This allows to remove
the linking of struct domain in a list. Note that the list of changed
domains per transaction is kept as a list
When a domain has been recognized to have stopped, remove all its
registered watches. This avoids sending watch events to the dead domain
when all the nodes related to it are being removed by the Xen tools.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_domain.c | 6 ++
1 file cha
tdb_logger() is called by TDB for logging errors. As errno is checked
often after doing the logging, tdb_logger() should preserve errno.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/xenstore/xenstored_core.c b/tools
Let corrupt() preserve errno in order to be able to simplify error
handling in future.
This is rather easy as the errno value when entering corrupt() is
saved already.
Signed-off-by: Juergen Gross
---
tools/xenstore/xenstored_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/xe
When destroying a domain, any stale permissions of the domain must be
removed from the special nodes "@...", too. This was not done in the
fix for XSA-322.
Fixes: 496306324d8d ("tools/xenstore: revoke access rights for removed domains")
Signed-off-by: Juergen Gross
Reviewed-by: Julien Grall
---
XEN_LIB_STORED is serving no real purpose, as it is a mount point for
a tmpfs, so it can be replaced easily by XEN_RUN_STORED.
XENSTORED_ROOTDIR is basically unused already, there is just a single
reference in xs_daemon_rootdir() with a fallback to XEN_LIB_STORED,
and a .gdbinit file setting it.
Today talloc_free() is not guaranteed to preserve errno, especially in
case a custom destructor is being used.
Change that by renaming talloc_free() to _talloc_free() in talloc.c and
adding a wrapper to talloc.c.
This allows to remove some errno saving outside of talloc.c.
Signed-off-by: Juergen
This is a first run of post-XSA patches which piled up during the
development phase of all the recent Xenstore related XSA patches.
At least the first 7 patches are completely independent from each
other. After those the dependencies are starting to be more complex.
This is a mixture of small fix
On Mon, Oct 31, 2022 at 01:26:44PM +, Bertrand Marquis wrote:
>
> > On 30 Oct 2022, at 21:14, Stefano Stabellini wrote:
> >
> > Ideally this would be something quick that can be easily invoked as the
> > first step of an external third-party build process.
>
> I think that we are making thi
On 01/11/2022 10:03, Xenia Ragiadakou wrote:
Hi Ayan,
Hi Xenia,
On 10/31/22 17:13, Ayan Kumar Halder wrote:
"unsigned long long" is defined as 64 bits on AArch64 and AArch32
Thus, one should this instead of "unsigned long" which is 32 bits
on AArch32.
Also use 'PRIx64' instead of 'lx' or '
On 11/1/22 13:57, Julien Grall wrote:
Hi Ayan,
On 01/11/2022 10:59, Ayan Kumar Halder wrote:
On 01/11/2022 09:50, Julien Grall wrote:
Hi,
Hi Xenia, Julien,
I have few clarifications.
On 01/11/2022 07:08, Xenia Ragiadakou wrote:
On 10/31/22 17:13, Ayan Kumar Halder wrote:
Defined read
flight 174564 linux-linus real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174564/
Regressions :-(
Tests which did not succeed and are blocking,
including tests which could not be run:
test-arm64-arm64-xl-vhd 8 xen-boot fail REGR. vs. 173462
test-arm64-arm64-xl
flight 174565 ovmf real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174565/
Perfect :-)
All tests in this flight passed as required
version targeted for testing:
ovmf 720c25ab41400f9a3dfd0742da5a6d237991df5b
baseline version:
ovmf df7ce74e6c75e19a528d5
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42325,CVE-2022-42326 / XSA-421
version 2
Xenstore: Guests can create arbitrary number of nodes via transactions
UPDATES IN VERSION 2
Fix typo in title.
Publi
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42324 / XSA-420
version 2
Oxenstored 32->31 bit integer truncation issues
UPDATES IN VERSION 2
Public release.
ISSUE DESCRIPTION
==
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42322,CVE-2022-42323 / XSA-419
version 2
Xenstore: Cooperating guests can create arbitrary numbers of nodes
UPDATES IN VERSION 2
Public release.
ISSUE DESC
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42327 / XSA-412
version 2
x86: unintended memory sharing between guests
UPDATES IN VERSION 2
Public release.
ISSUE DESCRIPTION
=
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42310 / XSA-415
version 2
Xenstore: Guests can create orphaned Xenstore nodes
UPDATES IN VERSION 2
Public release.
ISSUE DESCRIPTION
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42309 / XSA-414
version 2
Xenstore: Guests can crash xenstored
UPDATES IN VERSION 2
Public release.
ISSUE DESCRIPTION
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Xen Security Advisory CVE-2022-42320 / XSA-417
version 2
Xenstore: Guests can get access to Xenstore nodes of deleted domains
UPDATES IN VERSION 2
Public release.
ISSUE DESCRIPTION
Hi Ayan,
On 01/11/2022 10:59, Ayan Kumar Halder wrote:
On 01/11/2022 09:50, Julien Grall wrote:
Hi,
Hi Xenia, Julien,
I have few clarifications.
On 01/11/2022 07:08, Xenia Ragiadakou wrote:
On 10/31/22 17:13, Ayan Kumar Halder wrote:
Defined readq_relaxed()/writeq_relaxed() to read and
On 01/11/2022 08:58, Michal Orzel wrote:
On 31/10/2022 18:53, Michal Orzel wrote:
Hi Ayan,
Hi Michal,
On 31/10/2022 16:13, Ayan Kumar Halder wrote:
Refer
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir.bootlin.com%2Flinux%2Fv6.1-rc1%2Fsource%2Farch%2Farm64%2F&d
"Garhwal, Vikram" writes:
> Thanks, Alex, for reviewing this one. I built for all the archs and it was
> fine. Can you please share more about what
> environment builds are breaking? So, I can test the changes for v2.
My cross build environment failed:
../../configure' '--disable-docs' '--
On 01/11/2022 09:50, Julien Grall wrote:
Hi,
Hi Xenia, Julien,
I have few clarifications.
On 01/11/2022 07:08, Xenia Ragiadakou wrote:
On 10/31/22 17:13, Ayan Kumar Halder wrote:
Defined readq_relaxed()/writeq_relaxed() to read and write 64 bit regs.
This uses ldrd/strd instructions.
S
Hi Ayan,
On 10/31/22 17:13, Ayan Kumar Halder wrote:
"unsigned long long" is defined as 64 bits on AArch64 and AArch32
Thus, one should this instead of "unsigned long" which is 32 bits
on AArch32.
Also use 'PRIx64' instead of 'lx' or 'llx' to print uint64_t.
Signed-off-by: Ayan Kumar Halder
-
flight 174563 xen-unstable real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174563/
Failures :-/ but no regressions.
Tests which did not succeed, but are not blocking:
test-amd64-amd64-xl-qemut-win7-amd64 19 guest-stopfail like 174547
test-amd64-i386-xl-qemuu-win7-amd64
Hi,
On 01/11/2022 07:08, Xenia Ragiadakou wrote:
On 10/31/22 17:13, Ayan Kumar Halder wrote:
Defined readq_relaxed()/writeq_relaxed() to read and write 64 bit regs.
This uses ldrd/strd instructions.
Signed-off-by: Ayan Kumar Halder
---
Changes from :-
v1 - 1. Use ldrd/strd for readq_relaxed(
On 31/10/2022 18:53, Michal Orzel wrote:
>
>
> Hi Ayan,
>
> On 31/10/2022 16:13, Ayan Kumar Halder wrote:
>>
>>
>> Refer
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir.bootlin.com%2Flinux%2Fv6.1-rc1%2Fsource%2Farch%2Farm64%2F&data=05%7C01%7Cmichal.orzel%40amd.com
On 29.10.22 23:50, osstest service owner wrote:
flight 174539 linux-linus real [real]
http://logs.test-lab.xenproject.org/osstest/logs/174539/
Regressions :-(
I'm rather sure this is not kernel related, as the issue is occurring only on
Arm and it doesn't seem to be an architecture related iss
Hi Ayan,
On 10/31/22 17:13, Ayan Kumar Halder wrote:
Defined readq_relaxed()/writeq_relaxed() to read and write 64 bit regs.
This uses ldrd/strd instructions.
Signed-off-by: Ayan Kumar Halder
---
Changes from :-
v1 - 1. Use ldrd/strd for readq_relaxed()/writeq_relaxed().
2. No need to use le6
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