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Groups > linux.kernel > #1513417

[PATCH V2 04/14] Drivers: hv: balloon: Disable hot add when CONFIG_MEMORY_HOTPLUG is not set

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From: Alex Ng <alexng@messages.microsoft.com>

If the guest does not support memory hotplugging, it should respond to
the host with zero pages added and successful result code. This signals
to the host that hotplugging is not supported and the host will avoid
sending future hot-add requests.

Signed-off-by: Alex Ng <alexng@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
---
 drivers/hv/hv_balloon.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index fdf8da9..8f932aa 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1501,7 +1501,11 @@ static int balloon_probe(struct hv_device *dev,
 	struct dm_version_request version_req;
 	struct dm_capabilities cap_msg;
 
+#ifdef CONFIG_MEMORY_HOTPLUG
 	do_hot_add = hot_add;
+#else
+	do_hot_add = false;
+#endif
 
 	/*
 	 * First allocate a send buffer.
-- 
1.7.4.1

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[PATCH V2 00/14] Drivers: hv: Some miscellaneous fixes and enhancements  kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 08/14] Drivers: hv: balloon: Fix info request to show max page count kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
    Re: [PATCH V2 08/14] Drivers: hv: balloon: Fix info request to show  max page count Dan Carpenter <dan.carpenter@oracle.com> - 2016-11-10 20:20 +0100
      RE: [PATCH V2 08/14] Drivers: hv: balloon: Fix info request to show  max page count "Alex Ng (LIS)" <alexng@microsoft.com> - 2016-11-11 00:20 +0100
  [PATCH V2 04/14] Drivers: hv: balloon: Disable hot add when CONFIG_MEMORY_HOTPLUG is not set kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 02/14] Drivers: hv: utils: reduce HV_UTIL_NEGO_TIMEOUT timeout kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 12/14] Drivers: hv: vmbus: Base host signaling strictly on the ring state kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 03/14] Drivers: hv: utils: Fix the mapping between host version and protocol to use kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 11/14] tools: hv: remove unnecessary header files and netlink related code kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 14/14] Drivers: hv: vmbus: On the read path cleanup the logic to interrupt the host kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 07/14] Drivers: hv: vss: Operation timeouts should match host expectation kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
  [PATCH V2 01/14] Drivers: hv: ring_buffer: count on wrap around mappings in get_next_pkt_raw() (v2) kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
    [PATCH V2 10/14] tools: hv: fix a compile warning in snprintf kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
    [PATCH V2 06/14] Drivers: hv: vss: Improve log messages. kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
    [PATCH V2 09/14] tools: hv: remove unnecessary link flag kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
    [PATCH V2 13/14] Drivers: hv: vmbus: On write cleanup the logic to interrupt the host kys@exchange.microsoft.com - 2016-11-01 19:20 +0100
    [PATCH V2 05/14] Drivers: hv: balloon: Add logging for dynamic memory operations kys@exchange.microsoft.com - 2016-11-01 19:20 +0100

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