linux-kernel - Re: ioremap_xxx() with EXEC enabled

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Message-ID: <20080130094427.720fdae7@laptopd505.fenrus.org>
Date:	Wed, 30 Jan 2008 09:44:27 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <ak@...e.de>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: ioremap_xxx() with EXEC enabled

On Wed, 30 Jan 2008 18:30:48 +0100
Andi Kleen <ak@...e.de> wrote:

> On Wed, Jan 30, 2008 at 07:45:40AM -0800, Arjan van de Ven wrote:
> > On Wed, 30 Jan 2008 17:32:10 +0800
> > "Huang, Ying" <ying.huang@...el.com> wrote:
> > 
> > > Hi,
> > > 
> > > On i386, EFI may need to map EFI runtime code area as EXEC enabled
> > > with ioremap(). But, I found that the memory are mapped as EXEC
> > > disabled when mapped with ioremap() now. I think we may need a
> > > method to map memory area as EXEC enabled with ioremap_xxx().
> > > Some possible interface schemes for mapping as EXEC enabled are
> > > as follow:
> > > 
> > > - Interface scheme 1:
> > 
> > scheme 3:
> > 
> > set_memory_x(... )
> 
> On i386 EFI is unlikely to be in the direct mapping ...

1) 32 bit EFI is totally irrelevant.
2) set_memory_ and set_pages_ API is not restricted to direct mapping. That's why they take a virtual address / struct page

> 
> -Andi
> 


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