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Date: Mon, 13 Nov 2006 21:39:05 +0100 From: Arjan van de Ven <arjan@...radead.org> To: Tomasz Torcz <zdzichu@....pl> Cc: linux-kernel <linux-kernel@...r.kernel.org>, kvm-devel@...ts.sourceforge.net Subject: Re: overriding BIOS (was: Re: [ANNOUNCE] kvm howto) On Mon, 2006-11-13 at 21:34 +0100, Tomasz Torcz wrote: > On Mon, Nov 06, 2006 at 12:15:02AM -0800, Dor Laor wrote: > > The BIOS check is a must, it checks bit #0 of MSR_IA32_FEATURE_CONTROL, > > if it set this means that software cannot write to the MSR. If bit #2 is > > clear too then when executing vmxon you'll get #GP. > > > > So the check should better be there... > > You were right, just writing to this MSR (via kvm_enable) halts my laptop. > Which is kinda strange, as this solution works on Intel Mac Minis. > > Anyway, complaint to Lenovo sent and got ignored. > the linux-ready firmware developer kit now tries to test for this; with some luck the bios people will run this and fix it ;) -- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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