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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-10-07 13:58:46 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-10 19:29:21 +0200
commitb27a43c1e90582facad44de67d02bc9e9f900289 (patch)
tree5cdf26c4043e9345cb132798a8535ccb9c20aa9a /include/asm-x86/pgtable.h
parentad2cde16a21985cdc4302e4a4b0fc373d666fdf7 (diff)
x86, cpa: make the kernel physical mapping initialization a two pass sequence, fix
Jeremy Fitzhardinge wrote: > I'd noticed that current tip/master hasn't been booting under Xen, and I > just got around to bisecting it down to this change. > > commit 065ae73c5462d42e9761afb76f2b52965ff45bd6 > Author: Suresh Siddha <suresh.b.siddha@intel.com> > > x86, cpa: make the kernel physical mapping initialization a two pass sequence > > This patch is causing Xen to fail various pagetable updates because it > ends up remapping pagetables to RW, which Xen explicitly prohibits (as > that would allow guests to make arbitrary changes to pagetables, rather > than have them mediated by the hypervisor). Instead of making init a two pass sequence, to satisfy the Intel's TLB Application note (developer.intel.com/design/processor/applnots/317080.pdf Section 6 page 26), we preserve the original page permissions when fragmenting the large mappings and don't touch the existing memory mapping (which satisfies Xen's requirements). Only open issue is: on a native linux kernel, we will go back to mapping the first 0-1GB kernel identity mapping as executable (because of the static mapping setup in head_64.S). We can fix this in a different patch if needed. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/pgtable.h')
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