From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott Wood Subject: Re: [PATCH] KVM: PPC: Book3E 64: Fix IRQs warnings and hangs Date: Fri, 3 May 2013 18:30:46 -0500 Message-ID: <1367623846.19391.15@snotra> References: <300B73AA675FCE4A93EB4FC1D42459FF3E9D81@039-SN2MPN1-013.039d.mgd.msft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="Flowed"; DelSp="Yes" Content-Transfer-Encoding: 7bit Cc: Wood Scott-B07421 , "linuxppc-dev@lists.ozlabs.org" , "kvm@vger.kernel.org" , "kvm-ppc@vger.kernel.org" To: Caraman Mihai Claudiu-B02008 Return-path: In-Reply-To: <300B73AA675FCE4A93EB4FC1D42459FF3E9D81@039-SN2MPN1-013.039d.mgd.msft.net> (from B02008@freescale.com on Fri May 3 17:59:32 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 05/03/2013 05:59:32 PM, Caraman Mihai Claudiu-B02008 wrote: > > -----Original Message----- > > From: Wood Scott-B07421 > > Sent: Saturday, May 04, 2013 1:07 AM > > To: Caraman Mihai Claudiu-B02008 > > Cc: Wood Scott-B07421; kvm-ppc@vger.kernel.org; kvm@vger.kernel.org; > > linuxppc-dev@lists.ozlabs.org > > Subject: Re: [PATCH] KVM: PPC: Book3E 64: Fix IRQs warnings and > hangs > > > > I replaced the two calls to kvmppc_lazy_ee_enable() with calls to > > hard_irq_disable(), and it seems to be working fine. > > Please take a look on 'KVM: PPC64: booke: Hard disable interrupts when > entering guest' RFC thread and see if your solution addresses Ben's > comments. My original one didn't (there was a race if an interrupt comes in between soft-disabling and hard-disabling, it wouldn't be received until the guest exits for some other reason). Instead, I turned the local_irq_disable() into hard_irq_disable() plus trace_hardirqs_off(). This worked without warnings. -Scott