Re: [PATCH v3 0/5] KVM: optimize userspace exits with a new ioctl

From: Paolo Bonzini
Date: Mon Sep 07 2015 - 08:33:20 EST

On 02/09/2015 12:31, Christian Borntraeger wrote:
> As far as I can see this should also work for s390 (when we implement
> REQ_EXIT handling)
> To double check my understanding: these improvements come with a changed
> userspace that does not use KVM_SET_SIGNAL_MASK and therefore this
> conditional is false
> if (vcpu->sigset_active)
> sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
> Correct?
> That also means we improve exits that go to userspace but lightweight exits
> that stay inside the kernel are not affected.

Yes, both observations are correct.

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