Re: [Xen-devel] [PATCH] xen,x86: introduce tcg_errata

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 25/01/18 18:37, Stefano Stabellini wrote:
> The TCG emulator in QEMU is not good enough to pass the the tests in
> stub_selftest. Detect if Xen is running on TCG early, then drop the
> tests if it is the case.
>
> Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

I'm still opposed to this change.  The selftests demonstrate that TCG
doesn't work for an architectural area we depend, and simply pretending
its not buggy isn't ok.  If this were a piece of real hardware, it would
be blacklisted in a similar fashion to XSA-9.

I still haven't seen a convincing enough usecase to cause Xen to
proactively look for Qemu in all cases including release builds on real
hardware.

~Andrew

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