On 11/3/2020 2:25 AM, Paolo Bonzini wrote:
On 02/11/20 19:01, Andy Lutomirski wrote:
What's the point? Surely the kernel should reliably mitigate the
flaw, and the kernel should decide how to do so.
There is some slowdown in trapping #DB and #AC unconditionally. Though
for these two cases nobody should care so I agree with keeping the code
simple and keeping the workaround.
OK.
Also, why would this trigger after more than a few hundred cycles,
something like the length of the longest microcode loop? HZ*10 seems
like a very generous estimate already.
As Sean said in another mail, 1/10 tick should be a placeholder.
Glad to see all of you think it should be smaller. We'll come up with
more reasonable candidate once we can test on real silicon.
