Groups > linux.kernel > #1220141

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

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v3 0/5] KVM: optimize userspace exits with a new ioctl
Date	2015-09-07 14:40 +0200
Message-ID	<q63Si-5E0-35@gated-at.bofh.it> (permalink)
References	<pXkfD-7xK-3@gated-at.bofh.it> <q4eyv-3NB-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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.

Paolo
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Re: [PATCH v3 0/5] KVM: optimize userspace exits with a new ioctl Christian Borntraeger <borntraeger@de.ibm.com> - 2015-09-02 13:40 +0200
  Re: [PATCH v3 0/5] KVM: optimize userspace exits with a new ioctl Paolo Bonzini <pbonzini@redhat.com> - 2015-09-07 14:40 +0200

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