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authorIan Campbell <ian.campbell@citrix.com>2010-11-03 18:32:21 +0300
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-11-30 04:07:53 +0300
commit805e3f495057aa5307ad4e3d6dc7073d4733c691 (patch)
tree7d5bfeb30f5e178f05b932c20d64f2d9fd98583f /drivers/xen
parent31e323cca9d5c8afd372976c35a5d46192f540d1 (diff)
downloadlinux-805e3f495057aa5307ad4e3d6dc7073d4733c691.tar.xz
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>
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