From: Petr Vandrovec <vandrove@vc.cvut.cz>
To: Arjan van de Ven <arjan@infradead.org>
Cc: mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH[ Export __PAGE_KERNEL_EXEC for modules (vmmon)
Date: Fri, 29 Oct 2004 13:38:37 +0200 [thread overview]
Message-ID: <20041029113837.GD10837@vana.vc.cvut.cz> (raw)
In-Reply-To: <1099040620.2641.11.camel@laptop.fenrus.org>
On Fri, Oct 29, 2004 at 11:03:41AM +0200, Arjan van de Ven wrote:
> On Fri, 2004-10-29 at 00:11 +0200, Petr Vandrovec wrote:
> > Hello Ingo,
> > recently support for NX on i386 arrived to 2.6.x kernel, and I have
> > some problems building code which uses vmap since then - PAGE_KERNEL_EXEC
>
> why are you vmap'ing *executable* kernel memory?
> That sounds very wrong.... very very wrong. The module loader needs it,
> sure, but that's not modular. What on earth are you doing ????
Due to rule that not everything should be in kernel, userspace
picks one of codes needed to switch processor from currently used
mode & address space to mode VMware needs (ia32 => long, long => ia32,
PAE <=> non-PAE + cr3 + gdt + idt) maps it into kernel space, and then run
it as needed. And for running it it must be executable.
OK, I think that I understand message. __pgprot(__PAGE_KERNEL & ~_PAGE_NX)
is my friend.
Petr Vandrovec
next prev parent reply other threads:[~2004-10-29 11:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-28 22:11 Petr Vandrovec
2004-10-29 9:03 ` Arjan van de Ven
2004-10-29 11:38 ` Petr Vandrovec [this message]
2004-10-29 11:42 ` Arjan van de Ven
2004-10-29 12:00 ` Christoph Hellwig
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