Messages in this thread | | | Subject | Re: [PATCH] KVM: VMX: Enable Notify VM exit | From | Xiaoyao Li <> | Date | Tue, 3 Nov 2020 14:39:30 +0800 |
| |
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.
| |