bitkeeper revision 1.1345 (4266bd05lHlHunb0CEvOq60j2DvKCQ)

bitkeeper revision 1.1345 (4266bd05lHlHunb0CEvOq60j2DvKCQ)

[PATCH] VMX world switch

The attached code implements a VMX world switch to vmxassist (a small assist
module residing in a VMX enabled partition where it is responsible for
emulating real mode) whever CR0.PE is disabled.

The patch temporarily disables the PGE feature flag in cpuid as it is
currently broken (try running an unmodified 2.6 kernel that sets PGE in
mm/init.c/paging_init()).

The patch adds consistency checks before setting the ARCH_VMX_IO_WAIT state
to detect race conditions on SMP systems.

Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com>
Signed-off-by: ian@xensource.com