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authorIngo Molnar <mingo@elte.hu>2008-05-12 21:21:15 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-05-23 18:16:15 +0200
commitb1979a5fda7869a790f4fd83fb06c78498d26ba1 (patch)
treee15546fb2e002fbe1fa0a638c305bd30c8b19df5 /.gitignore
parenta1289643adb6272c04db9399653ae195072c482a (diff)
downloadvexpress-lsk-b1979a5fda7869a790f4fd83fb06c78498d26ba1.tar.gz
x86: prevent PGE flush from interruption/preemption
CR4 manipulation is not protected against interrupts and preemption, but KVM uses smp_function_call to manipulate the X86_CR4_VMXE bit either from the CPU hotplug code or from the kvm_init call. We need to protect the CR4 manipulation from both interrupts and preemption. Original bug report: http://lkml.org/lkml/2008/5/7/48 Bugzilla entry: http://bugzilla.kernel.org/show_bug.cgi?id=10642 This is not a regression from 2.6.25, it's a long standing and hard to trigger bug. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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