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vmw_balloon: do not use 2MB without batching 

If the hypervisor sets 2MB batching is on, while batching is cleared,
the balloon code breaks. In this case the legacy mechanism is used with
2MB page. The VM would report a 2MB page is ballooned, and the
hypervisor would only take the first 4KB.

While the hypervisor should not report such settings, make the code more
robust by not enabling 2MB support without batching.

Fixes: 365bd7ef7e ("VMware balloon: Support 2m page ballooning.")
Cc: stable@vger.kernel.org
Reviewed-by: Xavier Deguillard <xdeguillard@vmware.com>
Signed-off-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nadav Amit 2018-06-19 16:00:25 -07:00 committed by Greg Kroah-Hartman
parent 09755690c6
commit 5081efd112
1 changed files with 7 additions and 1 deletions
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8
drivers/misc/vmw_balloon.c
View File

@ -341,7 +341,13 @@ static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
success = false;
}
if (b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS)
/*
* 2MB pages are only supported with batching. If batching is for some
* reason disabled, do not use 2MB pages, since otherwise the legacy
* mechanism is used with 2MB pages, causing a failure.
*/
if ((b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS) &&
(b->capabilities & VMW_BALLOON_BATCHED_CMDS))
b->supported_page_sizes = 2;
else
b->supported_page_sizes = 1;