At Thu, 15 Jun 2006 09:08:37 +0100,
Keir Fraser wrote:
> On 15 Jun 2006, at 09:00, Simon Kagstrom wrote:
> > Thanks for the explanation. Would the WP flag work in a HVM setting?
>
> It may not be supported right now, but it would be easy to do so if not.
Does Xen itself rely on running with the WP flag set? I'll go with the
HVM supported WP-bit later, but as I don't have the hardware yet, I
wanted to try to just clear the bit in Xen, and that seems to cause
problems. Changing
diff -r 17fbffb737d9 xen/arch/x86/boot/x86_32.S
--- a/xen/arch/x86/boot/x86_32.S Thu Jun 22 21:41:19 2006 +0100
+++ b/xen/arch/x86/boot/x86_32.S Mon Jul 03 13:43:07 2006 +0200
@@ -150,7 +150,7 @@ no_execute_disable:
#endif
mov $idle_pg_table-__PAGE_OFFSET,%eax
mov %eax,%cr3
- mov $0x80050033,%eax /* hi-to-lo: PG,AM,WP,NE,ET,MP,PE */
+ mov $0x80040033,%eax /* hi-to-lo: PG,AM,NE,ET,MP,PE */
mov %eax,%cr0
jmp 1f
1: /* Install relocated selectors (FS/GS unused). */
Causes an assertion to trigger when booting the Linux dom0:
(XEN) Assertion '(x & PGT_count_mask) != 0' failed, line 1430, file mm.c
Is this due to how Xen works or is it because Linux uses writable page
tables (I have not checked the Linux sources other than the
__xen_guest_section).
// Simon
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