Re: [PATCH] x86/sgx: Avoid softlockup from sgx_vepc_release

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On Thu Aug 17, 2023 at 10:00 AM UTC, Huang, Kai wrote:
> On Thu, 2023-08-17 at 09:38 +0200, Jinpu Wang wrote:
> > > This adds cond_resched() to the first two loops: releasing non-SECS pages and
> > > releasing SECS pages which don't have children on remote vepc instance(s).
> > > There is a third round loop to release SECS pages which have children on remote
> > > vepc instance(s).  I think it's better to add cond_resched() there too, although
> > > it's extremely unlikely it could trigger softlockup w/o cond_resched().
> > 
> > I also think the third one are extremely unlikely could cause softlockup.
> > And our tests do not hit it either.
>
> If we only consider your tests, then I believe you even don't need the second
> cond_resched()?
>
> I think we should just add cond_resched() to all the three loops.  No harm, and
> we don't need to worry about this anymore.

I'm fine with this.

BR, Jarkko




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