------- Comment From mauri...@br.ibm.com 2016-11-29 17:04 EDT-------
Hi Canonical
(@hendrix @timg-tpi)
Attaching proper backports of the 3 patches [1] for 16.04.x.
Built and verified on top of ubuntu-xenial.git master-next -- currently,
52.73 at 44b1707bf297 ("kvm/irqchip: kvm_arch_irq_routing_update
renaming split").
This is the test-case.
A bunch of 64k writes to partitions on NVMe drive, simultaneously.
No messages are printed to dmesg.
Linux ubuntu 4.4.0-52-generic #73+bz142128v1 SMP Tue Nov 29 13:06:49 CST
2016 ppc64le ppc64le ppc64le GNU/Linux
root@ubuntu:~# dmesg -c >/dev/null; for p in 2 {5..11}; do echo $p; dd
if=/dev/zero of=/dev/nvme0n1p$p bs=64k count=128k & done; wait; echo dmesg
begin; dmesg; echo dmesg end
<...>
[1] Done dd if=/dev/zero of=/dev/nvme0n1p$p bs=64k
count=128k
<...>
[8]+ Done dd if=/dev/zero of=/dev/nvme0n1p$p bs=64k
count=128k
dmesg begin
dmesg end
[1]
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=DMA_ATTR_NO_WARN
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https://bugs.launchpad.net/bugs/1633128
Title:
ISST-LTE:pVM nvme 0000:a0:00.0: iommu_alloc failed on NVMe card
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