Muli Ben-Yehuda wrote:
On Tue, Sep 23, 2008 at 02:18:51PM -0500, Anthony Liguori wrote:
Make sure you issue iopl() before any of the VCPU threads are
spawned. Otherwise, you may be running into issues when something
other than VCPU-0 is doing PIO/MMIO and you haven't iopl()'d for
that thread.
Yeah, we thought of that, but as far as I can recall this happened
with a single VCPU. In any case, we'll look into it again.
The io thread runs in a separate thread than the VCPU. So if you were
doing iopl(3) in the io thread (for instance, when called from
machine_init), then the VCPU thread wouldn't necessarily have inherited
the iopl().
You could also do it explicitly on vcpu thread construction.
Regards,
Anthony Liguori
Cheers,
Muli
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