Thanks for the update, Chris. The patch "storvsc: use small
sg_tablesize on x86" has not landed in mainline yet, but I can submit an
SRU request to include it as an Ubuntu SAUCE patch.
However, for Trusty I think we need to increase MAX_PAGE_BUFFER_COUNT in
addition to the patch "storvsc: use small sg_tablesize on x86". In my
testing a Trusty kernel with only the storvsc patch will still panic.
But a Trusty kernel with the storvsc patch and a value of 32 for
MAX_PAGE_BUFFER_COUNT will not panic.
There was actually a commit in v3.15-rc1, written by KY:
commit 7e5ec36834a5752304dc0751dfab42ba6ad64a85
Author: K. Y. Srinivasan <k...@microsoft.com>
Date: Fri Mar 7 00:10:34 2014 -0800
Drivers: hv: vmbus: Increase the limit on the number of pfns we can
handle
So for Trusty I think we need commit 7e5ec368 and the patch "storvsc: use small
sg_tablesize on x86".
I built two Trusty test kernels. One has only the "storvsc: use small
sg_tablesize on x86" patch. The other has a cherry pick of commit
7e5ec368 and the "storvsc: use small sg_tablesize on x86" patch.
Ovidiu R, if you have a chance can you test these two kernels? Before I submit
the new patch, I'd like to confirm if we also need commit 7e5ec368 or not.
Test kernel with only the new patch:
http://kernel.ubuntu.com/~jsalisbury/lp1495983/patched-kernel/trusty/trusty-with-only-use-small-sg_tablesize/
Test kernel with the new patch and a cherry pick of 7e5ec368:
http://kernel.ubuntu.com/~jsalisbury/lp1495983/patched-kernel/trusty/trusty-with-use-small-sg_tablesizeANDCommit7e5ec368/
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https://bugs.launchpad.net/bugs/1495983
Title:
[Hyper-V] kernel panic occurs when installing Ubuntu Server 15.10 x32
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