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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1741655
Title:
Regression: KVM no longer supports Intel CPUs without Virtual NMI
Status in linux package in Ubuntu:
Incomplete
Bug description:
Since upgrading from zesty to artful, I'm not longer able to use KVM on my
server:
# modprobe kvm-intel
modprobe: ERROR: could not insert 'kvm_intel': Input/output error
Searching tells me this is caused by requiring Virtual NMI support[1]
Running the script provided on the mailing list[1] to check virtualization
features confirms my CPU (Xeon E5345) doesn't support Virtual NMIs:
# python features.py | grep NMI
NMI exiting yes
Virtual NMIs no
NMI-window exiting no
Virtual NMI support was required in v4.12[1] and later reverted in
v4.14.3[2] as some models (including Xeons) don't support it, even if
others with the same core do.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1490803
[2] https://lkml.org/lkml/2017/8/7/231
[3]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/arch/x86/kvm/vmx.c?h=linux-4.13.y&id=2c82878b0cb38fd516fd612c67852a6bbf282003
[4]
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/arch/x86/kvm/vmx.c?h=linux-4.14.y&id=a77360e989f3dc06e4f177a0837d533d13a20d91
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