From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:57227) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SeMN8-0006eT-BY for qemu-devel@nongnu.org; Tue, 12 Jun 2012 04:22:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SeMN2-0000UE-5M for qemu-devel@nongnu.org; Tue, 12 Jun 2012 04:22:41 -0400 Received: from [222.73.24.84] (port=4116 helo=song.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SeMN1-0000Sk-P3 for qemu-devel@nongnu.org; Tue, 12 Jun 2012 04:22:36 -0400 Message-ID: <4FD6FD3B.2090800@cn.fujitsu.com> Date: Tue, 12 Jun 2012 16:26:35 +0800 From: Wen Congyang MIME-Version: 1.0 References: <4FB9E4CE.8060709@cn.fujitsu.com> <4FD6E5EC.3090802@cn.fujitsu.com> <4FD6F488.7090303@de.ibm.com> In-Reply-To: <4FD6F488.7090303@de.ibm.com> Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1 Subject: Re: [Qemu-devel] [PATCH] kvm: notify host when guest panicked List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Christian Borntraeger Cc: Gleb Natapov , kvm list , Jan Kiszka , "linux-kernel@vger.kernel.org" , qemu-devel , Avi Kivity , KAMEZAWA Hiroyuki At 06/12/2012 03:49 PM, Christian Borntraeger Wrote: >>> We have three solutions to implement this feature: >>> 1. use vmcall >>> 2. use I/O port >>> 3. use virtio-serial. >> >>> We have decided to avoid touching hypervisor. The reason why I choose >>> choose the I/O port is: >>> 1. it is easier to implememt >>> 2. it does not depend any virtual device >>> 3. it can work when startint the kernel > > Havent looked deeply into that, butz wouldnt kvm_hypercall0 also fulfill all of these > points? You just have to define the number for each architecture and then it should be > possible to write a simple panic driver that works on all architectures. > >>> --- a/include/linux/kvm_para.h >>> +++ b/include/linux/kvm_para.h >>> @@ -20,6 +20,14 @@ >>> #define KVM_HC_FEATURES 3 >>> #define KVM_HC_PPC_MAP_MAGIC_PAGE 4 >>> >>> +#define KVM_PV_PORT (0x505UL) >>> + > > ignoring the above, shouldnt a port number go into an architecture specific file? I am not sure whether it should be put into an architecture specific file. Thanks Wen Congyang > > > Christian > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >