The following commit:
commit f8f559422b6c6a05469dfde614b67789b6142cb5
Author: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Date: Fri Jun 7 16:51:26 2013 +0800
KVM: MMU: fast invalidate all mmio sptes
causes my kvm qemu qcow2 images to hang when they switch from the boot
console to the desktop. For example:
qemu-system-x86_64 -enable-kvm -net nic,vlan=0,model=virtio -net user -drive file=ubuntu,if=virtio,cache=unsafe -smp 2 -m 1024
boots normally at first, but then hangs as soon as Xorg gets started.`
Perf top shows:
20.99% [kernel] [k] svm_vcpu_run
17.24% [kernel] [k] handle_mmio_page_fault_common
15.61% [kernel] [k] kvm_arch_vcpu_ioctl_run
12.49% [kernel] [k] fast_page_fault.part.78
I'm running:
QEMU emulator version 1.4.2
on an AMD PhenomII X4 CPU.
--
Markus
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