Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752676AbaAYRvg (ORCPT ); Sat, 25 Jan 2014 12:51:36 -0500 Received: from mail-lb0-f179.google.com ([209.85.217.179]:60283 "EHLO mail-lb0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752500AbaAYRvc (ORCPT ); Sat, 25 Jan 2014 12:51:32 -0500 From: Mikael Pettersson MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <21219.63903.326798.277717@gargle.gargle.HOWL> Date: Sat, 25 Jan 2014 18:51:27 +0100 To: Mikulas Patocka Cc: Mikael Pettersson , Tony Luck , Fenghua Yu , linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/5] ia64 ski emulator patches In-Reply-To: References: <21218.28095.779306.523187@gargle.gargle.HOWL> X-Mailer: VM 8.1.2 under 24.1.1 (x86_64-redhat-linux-gnu) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mikulas Patocka writes: > > > On Fri, 24 Jan 2014, Mikael Pettersson wrote: > > > Mikulas Patocka writes: > > > Hi > > > > > > Here I'm sending some ia64 patches to make it work in the ski emulator. > > > This has been broken for a long time. > > > > Thanks. I've recently started running 3.x kernels on ia64 via ski, > > but I'm getting random kernel crashes with 3.13. I'll give your > > patches a try shortly. > > I also had some random page-table corruption when running recent kernels > in ski. The problems occured when upgrading the whole Debian distribution. > Kernel 2.6.8 was solid, new kernels caused problems, I don't know why. What I've seen so far seems to indicate that gcc-4.8.2 miscompiles ski, resulting in kernel oopses, and _possibly_ that gcc-4.7.3 miscompiles the kernel. Ski compiled by gcc-4.7.3 (on x86_64) running a kernel compiled by gcc-4.3.6 seems to be a solid combination for me. > > I've written a few patches to improve other aspects of running the > > kernel on ski: > > - ski patch to use tun/tap networking (no need to run ski as root) > > - ski patch to implement a fixed-frequency ITC (the ITC is currently > > highly variable, completely breaking basic timekeeping) > > - kernel patch to turn PAL_HALT_LIGHT into a new SSC_HALT_LIGHT, > > and a corresponing ski patch to pause() on SSC_HALT_LIGHT; this > > together with the fixed-frequency ITC patch allows ski to idle > > with very low host CPU overhead when the guest kernel idles > > - kernel patch to bump the RAM size from 130MB to 2GB > > > > I'd be happy to share these patches if there's interest in them. > > > > /Mikael > > I would be interested in them. I also patched that timekeeping issue in > ski. My ski patches are in for now. I'll post the kernel patches to linux-ia64 @ vger in a few minutes. /Mikael -- 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/