https://bugzilla.kernel.org/show_bug.cgi?id=107561
Bug ID: 107561
Summary: 4.2 breaks PCI passthrough in QEMU/KVM
Product: Virtualization
Version: unspecified
Kernel Version: 4.2
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
Assignee: virtualization_...@kernel-bugs.osdl.org
Reporter: fhor...@gmail.com
Regression: No
QEMU/KVM VM's using PCI pass-through are taking a long time to boot, or never
booting. The issue is only present when the VM has more then ~2.5G of ram. I
was able to get a VM with 6G to boot, but I had to let it run overnight.
More info can be found in this thread:
https://bbs.archlinux.org/viewtopic.php?id=203240
Someone in the forum seems to have narrowed it down to a a set of commits
regarding kvm and mtrr in 4.1-rc2 that are in the mainline kernel as of 4.2.
Specifically commit fa61213746a706dd975661151c35795ca4dd82c2 KVM: MTRR:
simplify kvm_mtrr_get_guest_memory_type.
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