[Bug 209079] CPU 0/KVM: page allocation failure on 5.8 kernel

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https://bugzilla.kernel.org/show_bug.cgi?id=209079

--- Comment #4 from Sean Christopherson (sean.j.christopherson@xxxxxxxxx) ---
GFP_DMA32 is a flag that forces a memory allocation to use physical memory that
is 32-bit addressable, i.e. below the 4g boundary.  Using GFP_DMA32 is
relatively uncommon, e.g. KVM uses that flag if and only if KVM is using or
shadowing 32-bit PAE paging.  The latter case (shadowing) is what is triggered
if NPT is disabled.

Can you try trying running with "kvm_amd nested=0 avic=1 npt=0" and/or "kvm_amd
nested=0 npt=0" on v5.8.7?  I'd like to at least confirm that whatever was
breaking your setup was fixed between v5.8.0 and v5.8.7, even if we don't
bisect to identify exactly what patch fixed the bug.

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