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Message-Id: <20180117132549.GC5708@osiris> Date: Wed, 17 Jan 2018 14:25:49 +0100 From: Heiko Carstens <heiko.carstens@...ibm.com> To: Martin Schwidefsky <schwidefsky@...ibm.com> Cc: Christian Borntraeger <borntraeger@...ibm.com>, Florian Weimer <fweimer@...hat.com>, linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org, kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>, Cornelia Huck <cohuck@...hat.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jon Masters <jcm@...hat.com>, Marcus Meissner <meissner@...e.de>, Jiri Kosina <jkosina@...e.cz> Subject: Re: [PATCH 4/6] s390: add system call to run tasks with modified branch prediction On Wed, Jan 17, 2018 at 12:55:06PM +0100, Martin Schwidefsky wrote: > On Wed, 17 Jan 2018 12:14:52 +0100 > Christian Borntraeger <borntraeger@...ibm.com> wrote: > > > On 01/17/2018 11:03 AM, Florian Weimer wrote: > > > On 01/17/2018 10:48 AM, Martin Schwidefsky wrote: > > >> rc = syscall(__NR_s390_modify_bp); > > >> if (rc) { > > >> perror("s390_modify_bp"); > > >> exit(EXIT_FAILURE); > > >> } > > > > > > Isn't this traditionally done through personality or prctl? > > > > I think we want this per thread (and not per process). So I assume personality > > will not work out. Can a prctl be done per thread? > > The prctl interface seems to be usable to set a per-thread control > as well. But there is no architecture specific prctl as far as I > can see. Maybe a common PR_SET_NOBP with an arch function like > arch_set_nobp. There is for example PR_MPX_ENABLE_MANAGEMENT, which is x86 specific. On the other hand x86 even has an arch_prctl() system call... ;)
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