From: Avi Kivity <avi@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Marcelo Tossati <mtosatti@redhat.com>,
Carsten Otte <cotte@de.ibm.com>, Alexander Graf <agraf@suse.de>,
Jens Freimann <jfrei@linux.vnet.ibm.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
KVM <kvm@vger.kernel.org>
Subject: Re: [patch 0/3] RFC: provide synchronous registers in kvm_run
Date: Thu, 22 Dec 2011 14:35:45 +0200 [thread overview]
Message-ID: <4EF32421.8000303@redhat.com> (raw)
In-Reply-To: <20111222115646.248800653@de.ibm.com>
On 12/22/2011 01:56 PM, Christian Borntraeger wrote:
> Avi, Marcelo,
>
> currently userspace can access guest registers via several ioctls. Some
> of these registers might be useful very often. Here the system call overhead
> for ioctl can make an exit more expensive than necessary.
> In a discussion with Alex Graf we concluded that it might be beneficial to
> have a subset of registers available in kvm_run. (The ioctls will also be
> available).
>
> This series provides a prototype implementation together with two example
> users for s390.
>
>
Interesting. Other archs emulate everything to do with registers in the
kernel, so this is not a fast path.
What workload does this benefit?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-12-22 12:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-22 11:56 [patch 0/3] RFC: provide synchronous registers in kvm_run Christian Borntraeger
2011-12-22 11:56 ` [patch 1/3] kvm: " Christian Borntraeger
2011-12-22 12:28 ` Avi Kivity
2012-01-09 12:59 ` Alexander Graf
2011-12-22 11:56 ` [patch 2/3] kvm-s390: provide the prefix register via kvm_run Christian Borntraeger
2011-12-22 11:56 ` [patch 3/3] kvm-s390: provide general purpose registers " Christian Borntraeger
2011-12-22 12:34 ` Avi Kivity
2011-12-22 12:39 ` Christian Borntraeger
2011-12-22 12:46 ` Avi Kivity
2011-12-22 12:41 ` Heiko Carstens
2011-12-22 12:47 ` Avi Kivity
2011-12-22 12:35 ` Avi Kivity [this message]
2011-12-22 12:49 ` [patch 0/3] RFC: provide synchronous registers in kvm_run Christian Borntraeger
2011-12-22 12:54 ` Avi Kivity
2011-12-22 13:17 ` Christian Borntraeger
2011-12-22 13:25 ` Avi Kivity
[not found] ` <1325605858-30492-1-git-send-email-borntraeger@de.ibm.com>
[not found] ` <1325605858-30492-4-git-send-email-borntraeger@de.ibm.com>
2012-01-04 8:16 ` [PATCH 3/3] kvm-s390: provide standard guest registers via kvm_run Heiko Carstens
2012-01-04 8:30 ` Christian Borntraeger
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