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| author | Ian Campbell <ian.campbell@citrix.com> | 2010-11-03 15:32:21 +0000 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-11-29 17:07:53 -0800 |
| commit | 805e3f495057aa5307ad4e3d6dc7073d4733c691 (patch) | |
| tree | 7d5bfeb30f5e178f05b932c20d64f2d9fd98583f /arch/x86/xen/enlighten.c | |
| parent | 31e323cca9d5c8afd372976c35a5d46192f540d1 (diff) | |
| download | linux-805e3f495057aa5307ad4e3d6dc7073d4733c691.tar.gz linux-805e3f495057aa5307ad4e3d6dc7073d4733c691.tar.bz2 linux-805e3f495057aa5307ad4e3d6dc7073d4733c691.zip | |
xen: x86/32: perform initial startup on initial_page_table
Only make swapper_pg_dir readonly and pinned when generic x86 architecture code
(which also starts on initial_page_table) switches to it. This helps ensure
that the generic setup paths work on Xen unmodified. In particular
clone_pgd_range writes directly to the destination pgd entries and is used to
initialise swapper_pg_dir so we need to ensure that it remains writeable until
the last possible moment during bring up.
This is complicated slightly by the need to avoid sharing kernel PMD entries
when running under Xen, therefore the Xen implementation must make a copy of
the kernel PMD (which is otherwise referred to by both intial_page_table and
swapper_pg_dir) before switching to swapper_pg_dir.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@linux.intel.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 4a5973abefc8..0db7303bccb6 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1187,8 +1187,6 @@ asmlinkage void __init xen_start_kernel(void) /* Allocate and initialize top and mid mfn levels for p2m structure */ xen_build_mfn_list_list(); - init_mm.pgd = pgd; - /* keep using Xen gdt for now; no urgent need to change it */ #ifdef CONFIG_X86_32 |