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

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Date:	Mon, 7 Sep 2015 14:33:11 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org
Subject: Re: [PATCH v3 0/5] KVM: optimize userspace exits with a new ioctl



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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