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<div>This is an issue that involves a combination of different software
packages, so my apologies in advance if this is the wrong list to post
on.</div><div><br></div><div>I'm experiencing terrible boot times when I
assign a large amount of RAM to a VM when used in combination with
VIFO/PCI-passthrough.</div><div><br></div><div>On a VM with a
Nvidia GTX 970 + USB controller
and 24GiB of RAM assigned, the time to the TianoCore splash screen is ~5
minutes. It's then ~30 seconds before Windows 10 begins to boot
(spinning dots). During this time, the QEMU CPU core threads are 100%
busy.</div><div><br></div><div>According to `perf`, the QMU CPU core
threads are spending most of their time waiting on a spinlock over
kvm->mmu_lock that's created by kvm_zap_gfn_range.</div><div><br></div><div>I'm fairly certain that ~1 year ago (if not longer) the same configuration didn't take this long to boot.</div><div><br></div><div>Regards,</div><div>Adam</div>
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