From: Zwane Mwaikambo <zwane@arm.linux.org.uk>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Martin J. Bligh" <mbligh@aracnet.com>,
Andrew Morton <akpm@osdl.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Hugh Dickins <hugh@veritas.com>
Subject: Re: [PATCH][2.6-mm] Fix 4G/4G X11/vm86 oops
Date: Mon, 17 Nov 2003 16:46:22 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.53.0311171639260.30079@montezuma.fsmlabs.com> (raw)
In-Reply-To: <Pine.LNX.4.53.0311151427080.30079@montezuma.fsmlabs.com>
On Sat, 15 Nov 2003, Zwane Mwaikambo wrote:
> The 4G/4G page fault handling path doesn't appear to handle faults
> happening whilst in vm86. The regs->xcs != __USER_CS so it confused the in
> kernel test.
>
> However i'm still debugging the X11 triple fault in test9-mm3
I've managed to `fix` the triple fault (see further below for the patch
in all it's glory). Unfortunately i have been unable to come up with a
simpler workaround which is fewer instructions and easier to debug. I have
tried the following;
mb()/barrier()
flush_tlb_all()
wbinvd()
outb(0x80,0x00)
local_irq_save(flags); local_irq_enable(); loop(); local_irq_restore(flags);
long_loop()
What i do know is that in the following code;
__asm__ __volatile__(
"xorl %%eax,%%eax; movl %%eax,%%fs; movl %%eax,%%gs\n\t"
"movl %0,%%esp\n\t"
"movl %1,%%ebp\n\t"
"jmp resume_userspace"
: /* no outputs */
:"r" (&info->regs), "r" (tsk->thread_info) : "ax");
It does get to resume_userspace as putting a $0 into %ebp will oops in
__switch_to
And here is the current 'workaround'. Any hints?
Index: arch/i386/kernel/vm86.c
===================================================================
RCS file: /build/cvsroot/linux-2.6.0-test9-mm3/arch/i386/kernel/vm86.c,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 vm86.c
--- arch/i386/kernel/vm86.c 13 Nov 2003 08:07:17 -0000 1.1.1.1
+++ arch/i386/kernel/vm86.c 17 Nov 2003 21:45:13 -0000
@@ -312,6 +311,8 @@ static void do_sys_vm86(struct kernel_vm
tsk->thread.screen_bitmap = info->screen_bitmap;
if (info->flags & VM86_SCREEN_BITMAP)
mark_screen_rdonly(tsk);
+
+ printk("ooh la la\n");
__asm__ __volatile__(
"xorl %%eax,%%eax; movl %%eax,%%fs; movl %%eax,%%gs\n\t"
"movl %0,%%esp\n\t"
next prev parent reply other threads:[~2003-11-17 21:47 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-13 7:30 2.6.0-test9-mm3 Andrew Morton
2003-11-13 20:03 ` [PATCH] linux-2.6.0-test9-mm3_verbose-timesource-acpi-pm_A0 john stultz
2003-11-13 22:03 ` 2.6.0-test9-mm3 - AIO test results Daniel McNeil
2003-11-17 5:25 ` Suparna Bhattacharya
2003-11-18 1:15 ` Daniel McNeil
2003-11-18 1:37 ` Daniel McNeil
2003-11-18 11:55 ` Suparna Bhattacharya
2003-11-18 23:47 ` Daniel McNeil
2003-11-24 9:42 ` Suparna Bhattacharya
2003-11-25 23:49 ` [PATCH 2.6.0-test9-mm5] aio-dio-fallback-bio_count-race.patch Daniel McNeil
2003-11-26 7:55 ` Suparna Bhattacharya
2003-12-02 1:35 ` Daniel McNeil
2003-12-02 15:25 ` Suparna Bhattacharya
2003-12-03 23:14 ` Daniel McNeil
2003-12-04 4:40 ` Suparna Bhattacharya
2003-11-13 22:04 ` 2.6.0-test9-mm3 (compile stats) John Cherry
2003-11-14 5:07 ` 2.6.0-test9-mm3 Martin J. Bligh
2003-11-14 20:57 ` 2.6.0-test9-mm3 Zwane Mwaikambo
2003-11-14 21:57 ` 2.6.0-test9-mm3 Martin J. Bligh
2003-11-14 21:37 ` 2.6.0-test9-mm3 Zwane Mwaikambo
2003-11-14 21:47 ` 2.6.0-test9-mm3 Linus Torvalds
2003-11-15 0:55 ` 2.6.0-test9-mm3 Zwane Mwaikambo
2003-11-15 19:34 ` [PATCH][2.6-mm] Fix 4G/4G X11/vm86 oops Zwane Mwaikambo
2003-11-15 19:52 ` Zwane Mwaikambo
2003-11-17 21:46 ` Zwane Mwaikambo [this message]
2003-11-17 22:42 ` Linus Torvalds
2003-11-17 23:01 ` Zwane Mwaikambo
2003-11-17 23:14 ` Zwane Mwaikambo
2003-11-18 7:21 ` Zwane Mwaikambo
2003-11-18 15:47 ` Linus Torvalds
2003-11-18 16:16 ` Zwane Mwaikambo
2003-11-18 16:37 ` Linus Torvalds
2003-11-18 17:08 ` Zwane Mwaikambo
2003-11-18 17:38 ` Martin J. Bligh
2003-11-18 17:22 ` Zwane Mwaikambo
2003-11-19 20:32 ` Matt Mackall
2003-11-19 23:09 ` Matt Mackall
2003-11-20 7:14 ` Zwane Mwaikambo
2003-11-20 7:44 ` Matt Mackall
2003-11-20 7:53 ` Andrew Morton
2003-11-20 8:13 ` Matt Mackall
2003-11-14 19:08 ` 2.6.0-test9-mm3 Martin J. Bligh
2003-11-14 18:59 ` 2.6.0-test9-mm3 Andrew Morton
2003-11-14 19:32 ` 2.6.0-test9-mm3 Mike Fedyk
2003-11-14 20:27 ` 2.6.0-test9-mm3 John Stoffel
2003-11-15 1:01 ` 2.6.0-test9-mm3 Mike Fedyk
2003-11-14 19:10 ` 2.6.0-test9-mm3 Badari Pulavarty
2003-11-14 20:29 ` 2.6.0-test9-mm3 Martin J. Bligh
2003-11-17 20:58 ` 2.6.0-test9-mm3 bill davidsen
2003-11-18 23:48 Re:Re: [PATCH][2.6-mm] Fix 4G/4G X11/vm86 oops Jon Foster
2003-11-19 3:24 ` Zwane Mwaikambo
2003-11-19 5:45 ` Andrew Morton
2003-11-19 6:50 ` Zwane Mwaikambo
2003-11-19 7:24 ` Linus Torvalds
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