This is a KVM bug, not a QEMU bug. It only happens with ept=1 and
unrestricted_guest=0. A workaround is to disable SMM in QEMU (-machine
smm=off) or to set kvm_intel's ept parameter to 0.
I'm closing the bug here because it is the wrong tracker (also I know
about it, can reproduce, and hope to provide a fix later this week).
** Changed in: qemu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1502934
Title:
QEMU does not start when kvm enabled (SMM issue?)
Status in QEMU:
Invalid
Bug description:
Hi!
QEMU stopped working after "[355023f2010c4df619d88a0dd7012b4b9c74c12c]
pc: add SMM property" on my server. It says "Guest has not initialized
the display (yet)." and nothing happens. But only if I use -enable-
kvm.
However, the problem gone after I hardcoded
pc_machine_is_smm_enabled() to always return false (but I have little
to no understanding of what SMM really is).
CMD line that reproduces the issue: qemu-system-x86_64 -enable-kvm
-display curses . It doesn't work the server, but works perfectly on
my laptop :(.
I'm using Arch Linux with all updates.
Some info:
Linux machine 4.2.2-1-ARCH #1 SMP PREEMPT Tue Sep 29 22:21:33 CEST 2015
x86_64 GNU/Linux
Qemu-2.4.0 (tried HEAD as well)
CPU: Intel(R) Core(TM) i7 CPU 950 @ 3.07GHz
Some messages from dmesg, just in case:
[ 6.996297] kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL does not work
properly. Using workaround
[ 6381.722990] kvm: zapping shadow pages for mmio generation wraparound
I'm more than happy to provide additional information if needed.
Cheers,
Alex
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