linux-kernel - RE: [RFC v3][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel support

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Date:	Mon, 11 May 2009 22:26:11 -0700
From:	"Cihula, Joseph" <joseph.cihula@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"jbeulich@...ell.com" <jbeulich@...ell.com>,
	"peterm@...hat.com" <peterm@...hat.com>,
	"Wei, Gang" <gang.wei@...el.com>,
	"Wang, Shane" <shane.wang@...el.com>
Subject: RE: [RFC v3][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel
	support

> From: Ingo Molnar [mailto:mingo@...e.hu]
> Sent: Friday, May 08, 2009 2:58 AM
>
> * Joseph Cihula <joseph.cihula@...el.com> wrote:
>
> > +   /* if we're being called before the 1:1 mapping is set up then just
> > +      return and let the normal shutdown happen; this should only be
> > +      due to very early panic() */
> > +   if (!tboot_pg_dir)
> > +           return;
>
> Please use the customary comment style:
>
>   /*
>    * Comment .....
>    * ...... goes here:
>    */
>
> specified in Documentation/CodingStyle. Please fix this in all other
> multi-line comments in your patch as well.

Will do.

> > +   if (shutdown_type == TB_SHUTDOWN_S3) {
> > +           tboot_shared->num_mac_regions = 3;
> > +           /* S3 resume code */
> > +           tboot_shared->mac_regions[0].start =
> > +                   PFN_PHYS(PFN_DOWN(acpi_wakeup_address));
> > +           tboot_shared->mac_regions[0].size =
> > +                   PFN_UP(WAKEUP_SIZE) << PAGE_SHIFT;
> > +           /* AP trampoline code */
> > +           tboot_shared->mac_regions[1].start =
> > +                   PFN_PHYS(PFN_DOWN(virt_to_phys(trampoline_base)));
> > +           tboot_shared->mac_regions[1].size =
> > +                   PFN_UP(TRAMPOLINE_SIZE) << PAGE_SHIFT;
> > +           /* kernel code + data + bss */
> > +           tboot_shared->mac_regions[2].start =
> > +                   PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
> > +           tboot_shared->mac_regions[2].size =
> > +                   PFN_PHYS(PFN_UP(virt_to_phys(&_end))) -
> > +                   PFN_PHYS(PFN_DOWN(virt_to_phys(&_text)));
> > +   }
> > +
> > +   tboot_shared->shutdown_type = shutdown_type;
> > +
> > +   switch_to_tboot_pt();
> > +
> > +   ((void(*)(void))(unsigned long)tboot_shared->shutdown_entry)();
>
> shutdown_entry should probably have a proper function pointer type,
> to avoid this ugliness.

Since pointer types are different lengths depending on whether it is a 32b or 64b build environment, that would not allow a separately-compiled tboot to be used with both 32b and 64b kernels.

Joe
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