FYI: Qemu Guest of Gentoo mounting host filesystem

[lyallp]

Because I am a masochist, I installed Gentoo inside a QEMU VM on my Gentoo system.

Part of that setup was to mount my /tmp via virtiofs to the guest system and setup portage to use that /tmp for building.

I figured, given the host /tmp is a ramfs, things would overall, be faster to build.

All things seemed to be going well, until I did my first 'emerge --update @world'

Big mistake.

Turns out, it appears virtiofs does not support (or at least I did not have configured appropriately) to allow xattrs.

So, build after build in the VM failed with various forms of xattr or listxattr errors.

Re-mounting the host /tmp somewhere else (such as /mnt/tmp) meant that emerge started using the local guest /tmp filesystem, and thus provided support for xattrs which led to successful builds.

I just thought I would post my experience here, in case there are any fellow masochists out there....
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...Lyall