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path: root/drivers/hv/hv_fcopy.c
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* Drivers: hv: fcopy: dynamically allocate smsg_out in fcopy_send_data()Vitaly Kuznetsov2015-08-041-8/+13
| | | | | | | | | | | | struct hv_start_fcopy is too big to be on stack on i386, the following warning is reported: >> drivers/hv/hv_fcopy.c:159:1: warning: the frame size of 1088 bytes is larger than 1024 bytes [-Wframe-larger-than=] Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: utils: unify driver registration reportingVitaly Kuznetsov2015-05-241-2/+1
| | | | | | | | | | Unify driver registration reporting and move it to debug level as normally daemons write to syslog themselves and these kernel messages are useless. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: fcopy: full handshake supportVitaly Kuznetsov2015-05-241-1/+15
| | | | | | | | | | Introduce FCOPY_VERSION_1 to support kernel replying to the negotiation message with its own version. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: fcopy: convert to hv_utils_transportVitaly Kuznetsov2015-05-241-148/+46
| | | | | | | | | | Unify the code with the recently introduced hv_utils_transport. Netlink communication is disabled for fcopy. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: fcopy: set .owner reference for file operationsVitaly Kuznetsov2015-05-241-4/+2
| | | | | | | | | | | Get an additional reference otherwise a crash is observed when hv_utils module is being unloaded while fcopy daemon is still running. .owner gives us an additional reference when someone holds a descriptor for the device. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: fcopy: switch to using the hvutil_device_state state machineVitaly Kuznetsov2015-05-241-40/+30
| | | | | | | | | | | | | | | | | | | | | | | Switch to using the hvutil_device_state state machine from using 3 different state variables: fcopy_transaction.active, opened, and in_hand_shake. State transitions are: -> HVUTIL_DEVICE_INIT when driver loads or on device release -> HVUTIL_READY if the handshake was successful -> HVUTIL_HOSTMSG_RECEIVED when there is a non-negotiation message from the host -> HVUTIL_USERSPACE_REQ after userspace daemon read the message -> HVUTIL_USERSPACE_RECV after/if userspace has replied -> HVUTIL_READY after we respond to the host -> HVUTIL_DEVICE_DYING on driver unload In hv_fcopy_onchannelcallback() process ICMSGTYPE_NEGOTIATE messages even when the userspace daemon is disconnected, otherwise we can make the host think we don't support FCOPY and disable the service completely. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: fcopy: rename fcopy_work -> fcopy_timeout_workVitaly Kuznetsov2015-05-241-7/+7
| | | | | | | | | | | 'fcopy_work' (and fcopy_work_func) is a misnomer as it sounds like we expect this useful work to happen and in reality it is just an emergency escape when timeout happens. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: fcopy: process deferred messages when we complete the transactionVitaly Kuznetsov2015-05-241-3/+9
| | | | | | | | | | | | | | In theory, the host is not supposed to issue any requests before be reply to the previous one. In KVP we, however, support the following scenarios: 1) A message was received before userspace daemon registered; 2) A message was received while the previous one is still being processed. In FCOPY we support only the former. Add support for the later, use hv_poll_channel() to do the job. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hv: hv_fcopy: drop the obsolete message on transfer failureDexuan Cui2015-01-251-0/+27
| | | | | | | | | | | | | In the case the user-space daemon crashes, hangs or is killed, we need to down the semaphore, otherwise, after the daemon starts next time, the obsolete data in fcopy_transaction.message or fcopy_transaction.fcopy_msg will be used immediately. Cc: Jason Wang <jasowang@redhat.com> Cc: Vitaly Kuznetsov <vkuznets@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>
* Drivers: hv: hv_fcopy: fix a race condition for SMP guestDexuan Cui2014-07-171-1/+1
| | | | | | | | | | | | | | | | | | | | | We should schedule the 5s "timer work" before starting the data transfer, otherwise, the data transfer code may finish so fast on another virtual cpu that when the code(fcopy_write()) trying to cancel the 5s "timer work" can occasionally fail because the "timer work" may haven't been scheduled yet and as a result the fcopy process will be aborted wrongly by fcopy_work_func() in 5s. Thank Liz Zhang <lizzha@microsoft.com> for the initial investigation on the bug. This addresses https://bugzilla.redhat.com/show_bug.cgi?id=1118123 Tested-by: Liz Zhang <lizzha@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: stable@vger.kernel.org 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>
* Drivers: hv: fcopy_open() can be staticFengguang Wu2014-02-181-2/+2
| | | | | | | CC: "K. Y. Srinivasan" <kys@microsoft.com> CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Drivers: hv: Implement the file copy serviceK. Y. Srinivasan2014-02-181-0/+414
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>
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