From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jan Beulich" Subject: Re: [RFC] [PATCH] Dom0: Don't switch back to user space stack in syscall entry Date: Thu, 11 Feb 2010 08:53:43 +0000 Message-ID: <4B73D3A7020000780002EE6D@vpn.id2.novell.com> References: <4B72F72F.3080107@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <4B72F72F.3080107@goop.org> Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jeremy Fitzhardinge , Yunhong Jiang Cc: "xen-devel@lists.xensource.com" , Keir Fraser List-Id: xen-devel@lists.xenproject.org >>> Jeremy Fitzhardinge 10.02.10 19:13 >>> >> b) Add IST support to xen hypervisor, Considering the ptrace issue in = http://lists.xensource.com/archives/html/xen-devel/2009-05/msg00200.html = and also Ingo's comments in http://lkml.indiana.edu/hypermail/linux/kernel/= 0905.1/00087.html, maybe it still have value to add such support. But not = sure if that is accepetable for xen hypervisor. >> =20 > >That would depend on Keir's thoughts, which I would guess depend on = what=20 >the patch and ABI would look like. It's certainly the most general=20 >solution if it can be done in a reasonable way. But if at all, I'd recommend considering a properly nesting solution rather than just to mimic hardware behavior (since there's no IDT, functionality needs to differ from native anyway). Jan