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path: root/drivers/hv/hv_util.c
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2016-10-25hv: do not lose pending heartbeat vmbus packetsLong Li1-3/+7
The host keeps sending heartbeat packets independent of the guest responding to them. Even though we respond to the heartbeat messages at interrupt level, we can have situations where there maybe multiple heartbeat messages pending that have not been responded to. For instance this occurs when the VM is paused and the host continues to send the heartbeat messages. Address this issue by draining and responding to all the heartbeat messages that maybe pending. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> CC: Stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-09Drivers: hv: hv_util: Avoid dynamic allocation in time synchVivek yadav1-11/+28
Under stress, we have seen allocation failure in time synch code. Avoid this dynamic allocation. Signed-off-by: Vivek Yadav <vyadav@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-08Drivers: hv: utils: Support TimeSync version 4.0 protocol samples.Alex Ng1-23/+59
This enables support for more accurate TimeSync v4 samples when hosted under Windows Server 2016 and newer hosts. The new time samples include a "vmreferencetime" field that represents the guest's TSC value when the host generated its time sample. This value lets the guest calculate the latency in receiving the time sample. The latency is added to the sample host time prior to updating the clock. Signed-off-by: Alex Ng <alexng@messages.microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-08Drivers: hv: utils: Use TimeSync samples to adjust the clock after boot.Alex Ng1-13/+7
Only the first 50 samples after boot were being used to discipline the clock. After the first 50 samples, any samples from the host were ignored and the guest clock would eventually drift from the host clock. This patch allows TimeSync-enabled guests to continuously synchronize the clock with the host clock, even after the first 50 samples. Signed-off-by: Alex Ng <alexng@messages.microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-09-08Drivers: hv: utils: Rename version definitions to reflect protocol version.Alex Ng1-10/+10
Different Windows host versions may reuse the same protocol version when negotiating the TimeSync, Shutdown, and Heartbeat protocols. We should only refer to the protocol version to avoid conflating the two concepts. Signed-off-by: Alex Ng <alexng@messages.microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-03-01Drivers: hv: util: Pass the channel information during the init callK. Y. Srinivasan1-0/+1
Pass the channel information to the util drivers that need to defer reading the channel while they are processing a request. This would address the following issue reported by Vitaly: Commit 3cace4a61610 ("Drivers: hv: utils: run polling callback always in interrupt context") removed direct *_transaction.state = HVUTIL_READY assignments from *_handle_handshake() functions introducing the following race: if a userspace daemon connects before we get first non-negotiation request from the server hv_poll_channel() won't set transaction state to HVUTIL_READY as (!channel) condition will fail, we set it to non-NULL on the first real request from the server. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-01Drivers: hv: util: On device remove, close the channel after de-initializing ↵K. Y. Srinivasan1-1/+1
the service When the offer is rescinded, vmbus_close() can free up the channel; deinitialize the service before closing the channel. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-03-01hv: hv_util: move vmbus_open() to a later placeDexuan Cui1-5/+6
Before the line vmbus_open() returns, srv->util_cb can be already running and the variables, like util_fw_version, are needed by the srv->util_cb. So we have to make sure the variables are initialized before the vmbus_open(). CC: "K. Y. Srinivasan" <kys@microsoft.com> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Dexuan Cui <decui@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-07-09Drivers: hv: util: Fix a bug in the KVP codeK. Y. Srinivasan1-1/+1
Add code to poll the channel since we process only one message at a time and the host may not interrupt us. Also increase the receive buffer size since some KVP messages are close to 8K bytes in size. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18Drivers: hv: Implement the file copy serviceK. Y. Srinivasan1-0/+11
Implement the file copy service for Linux guests on Hyper-V. This permits the host to copy a file (over VMBUS) into the guest. This facility is part of "guest integration services" supported on the Windows platform. Here is a link that provides additional details on this functionality: http://technet.microsoft.com/en-us/library/dn464282.aspx In V1 version of the patch I have addressed comments from Olaf Hering <olaf@aepfle.de> and Dan Carpenter <dan.carpenter@oracle.com> In V2 version of this patch I did some minor cleanup (making some globals static). In V4 version of the patch I have addressed all of Olaf's most recent set of comments/concerns. In V5 version of the patch I had addressed Greg's most recent comments. I would like to thank Greg for suggesting that I use misc device; it has significantly simplified the code. In V6 version of the patch I have cleaned up error message based on Olaf's comments. I have also rebased the patch based on the current tip. In this version of the patch, I have addressed the latest comments from Greg. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-29Merge 3.12-rc3 into char-misc-nextGreg Kroah-Hartman1-17/+54
We need/want the mei fixes in here so we can apply other updates that are depending on them. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26Drivers: hv: util: Correctly support ws2008R2 and earlierK. Y. Srinivasan1-17/+54
The current code does not correctly negotiate the version numbers for the util driver when hosted on earlier hosts. The version numbers presented by this driver were not compatible with the version numbers supported by Windows Server 2008. Fix this problem. I would like to thank Olaf Hering (ohering@suse.com) for identifying the problem. Reported-by: Olaf Hering <ohering@suse.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26hv: Change variable type to boolPeter Senna Tschudin1-1/+1
The variable execute_shutdown is only assigned the values true and false. Change its type to bool. The simplified semantic patch that find this problem is as follows (http://coccinelle.lip6.fr/): @exists@ type T; identifier b; @@ - T + bool b = ...; ... when any b = \(true\|false\) Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-02Drivers: hv: remove HV_DRV_VERSIONOlaf Hering1-1/+0
Remove HV_DRV_VERSION, it has no meaning for upstream drivers. Initially it was supposed to show the "Linux Integration Services" version, now it is not in sync anymore with the out-of-tree drivers available from the MSFT website. The only place where a version string is still required is the KVP command "IntegrationServicesVersion" which is handled by tools/hv/hv_kvp_daemon.c. To satisfy such KVP request from the host pass the current string to the daemon during KVP userland registration. Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-26Drivers: hv: util: Fix a bug in version negotiation code for util servicesK. Y. Srinivasan1-3/+18
The current code picked the highest version advertised by the host. WS2012 R2 has implemented a protocol version for KVP that is not compatible with prior protocol versions of KVP. Fix the bug in the current code by explicitly specifying the protocol version that the guest can support. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15Drivers: hv: Add a new driver to support host initiated backupK. Y. Srinivasan1-0/+10
This driver supports host initiated backup of the guest. On Windows guests, the host can generate application consistent backups using the Windows VSS framework. On Linux, we ensure that the backup will be file system consistent. This driver allows the host to initiate a "Freeze" operation on all the mounted file systems in the guest. Once the mounted file systems in the guest are frozen, the host snapshots the guest's file systems. Once this is done, the guest's file systems are "thawed". This driver has a user-level component (daemon) that invokes the appropriate operation on all the mounted file systems in response to the requests from the host. The duration for which the guest is frozen is very short - a few seconds. During this interval, the diff disk is comitted. In this version of the patch I have addressed the feedback from Olaf Herring. Also, some of the connector related issues have been fixed. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-25Drivers: hv: Execute shutdown in a thread contextK. Y. Srinivasan1-1/+11
Execute the shutdown code in a thread context. With recent changes made to the shutdown code, shutdown code cannot be invoked from an interrupt context. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-25Drivers: hv: Use consolidated GUID definitionsK. Y. Srinivasan1-12/+12
Use the consolidated GUID definitions in the util and balloon drivers. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17Drivers: hv: Turn off batched reading for util driversK. Y. Srinivasan1-0/+10
Util driver is not a performance critical driver and furthermore some util services such as KVP can only handle one outstanding message from the host. Turn off batched reading for util drivers. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-16Drivers: hv: Add KVP definitions for IP address injectionK. Y. Srinivasan1-2/+2
Add the necessary definitions for supporting the IP injection functionality. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: Olaf Hering <olaf@aepfle.de> Reviewed-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-14Drivers: hv: util: Properly handle version negotiations.K. Y. Srinivasan1-3/+6
The current version negotiation code is not "future proof". Fix this by allowing each service the flexibility to either specify the highest version it can support or it can support the highest version number the host is offering. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-02-02drivers: hv: kvp: Move the contents of hv_kvp.h to hyperv.hK. Y. Srinivasan1-3/+0
In preparation for consolidating all KVP related defines into a single header file that both the kernel and user level components can use, move the contents of hv_kvp.h into hyperv.h. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2011-10-11hv: rename prep_negotiate_resp() to vmbus_prep_negotiate_resp()Greg Kroah-Hartman1-3/+3
It's a global symbol, so properly prefix it and use the proper EXPORT value as well. Cc: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-10-10Staging: hv: move hyperv code out of staging directoryGreg Kroah-Hartman1-0/+354
After many years wandering the desert, it is finally time for the Microsoft HyperV code to move out of the staging directory. Or at least the core hyperv bus code, and the utility driver, the rest still have some review to get through by the various subsystem maintainers. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>