linux-kernel - RE: [PATCH 01/01][retry 3] x86: L3 cache index disable for 2.6.26

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Message-ID: <6453C3CB8E2B3646B0D020C112613273C5AC70@sausexmb4.amd.com>
Date:	Thu, 14 Aug 2008 11:41:34 -0500
From:	"Langsdorf, Mark" <mark.langsdorf@....com>
To:	"Pavel Machek" <pavel@...e.cz>
CC:	"Greg KH" <greg@...ah.com>,
	"Deguara, Joachim" <joachim.deguara@....com>, <gregkh@....cz>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 01/01][retry 3] x86: L3 cache index disable for 2.6.26

> > > > +        val |= 0xc0000000;
> > > > +        pci_write_config_dword(dev, 0x1BC + index * 4, val 
> > > & ~0x40000000);
> > > > +        wbinvd();
> > > > +        pci_write_config_dword(dev, 0x1BC + index * 4, val);
> > > 
> > > Should it do if capable() test before doing such stuff?
> > 
> > I don't think so.  If it got this far, it is an AMD processor
> > from family 0x10 or later, so it has wbinvd().
> 
> No, I meant we should check for permissions. Filesystem permissions
> are traditionaly not enough for stuff like this. if
> (capable(CAP_ADMIN)) or something?

I see what you mean.  I'll add a check again capable(CAP_SYS_ADMIN).

-Mark Langsdorf
Operating System Research Center
AMD

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