From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott Wood Subject: Re: [v1][KVM][PATCH 1/1] kvm:ppc:booehv: direct ISI exception to Guest Date: Wed, 8 May 2013 14:09:45 -0500 Message-ID: <1368040185.3398.53@snotra> References: <1367970043.3398.39@snotra> <5189B02E.3000109@windriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="Flowed"; DelSp="Yes" Content-Transfer-Encoding: 7bit Cc: linuxppc-dev@lists.ozlabs.org, agraf@suse.de, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org To: tiejun.chen Return-path: In-Reply-To: <5189B02E.3000109@windriver.com> (from tiejun.chen@windriver.com on Tue May 7 20:53:50 2013) Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+glppe-linuxppc-embedded-2=m.gmane.org@lists.ozlabs.org Sender: "Linuxppc-dev" List-Id: kvm.vger.kernel.org On 05/07/2013 08:53:50 PM, tiejun.chen wrote: > On 05/08/2013 07:40 AM, Scott Wood wrote: >> On 05/07/2013 06:06:30 AM, Tiejun Chen wrote: >>> We also can direct ISI exception to Guest like DSI. >>> >>> Signed-off-by: Tiejun Chen >>> --- >>> arch/powerpc/kvm/booke_emulate.c | 3 +++ >>> arch/powerpc/kvm/e500mc.c | 3 ++- >>> 2 files changed, 5 insertions(+), 1 deletion(-) >> >> Are you seeing a real performance improvement from this? This will >> interfere > > No. But after we reduce the exit to host, shouldn't this improve > performance? Not if ISIs are too rare to matter. -Scott