From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de (cantor2.suse.de [195.135.220.15]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx2.suse.de", Issuer "CAcert Class 3 Root" (not verified)) by ozlabs.org (Postfix) with ESMTPS id E0BE21007D3 for ; Sat, 3 Mar 2012 01:12:39 +1100 (EST) From: Alexander Graf To: kvm-ppc@vger.kernel.org Subject: [PATCH] PPC: Don't sync timebase when inside VM Date: Fri, 2 Mar 2012 15:12:33 +0100 Message-Id: <1330697553-27156-1-git-send-email-agraf@suse.de> Cc: Scott Wood , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , When running inside a virtual machine, we can not modify timebase, so let's just not call the functions for it then. This resolves hangs when booting e500 SMP guests on overcommitted hosts. Reported-by: Stuart Yoder Signed-off-by: Alexander Graf --- arch/powerpc/platforms/85xx/smp.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c index ff42490..d4b6c1f 100644 --- a/arch/powerpc/platforms/85xx/smp.c +++ b/arch/powerpc/platforms/85xx/smp.c @@ -249,6 +249,13 @@ void __init mpc85xx_smp_init(void) smp_85xx_ops.cause_ipi = doorbell_cause_ipi; } + /* When running under a hypervisor, we can not modify tb */ + np = of_find_node_by_path("/hypervisor"); + if (np) { + smp_85xx_ops.give_timebase = NULL; + smp_85xx_ops.take_timebase = NULL; + } + smp_ops = &smp_85xx_ops; #ifdef CONFIG_KEXEC -- 1.6.0.2