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Jeremy Fitzhardinge 9f79991d41 xen: deal with stale cr3 values when unpinning pagetables ... When a pagetable is no longer in use, it must be unpinned so that its pages can be freed. However, this is only possible if there are no stray uses of the pagetable. The code currently deals with all the usual cases, but there's a rare case where a vcpu is changing cr3, but is doing so lazily, and the change hasn't actually happened by the time the pagetable is unpinned, even though it appears to have been completed. This change adds a second per-cpu cr3 variable - xen_current_cr3 - which tracks the actual state of the vcpu cr3. It is only updated once the actual hypercall to set cr3 has been completed. Other processors wishing to unpin a pagetable can check other vcpu's xen_current_cr3 values to see if any cross-cpu IPIs are needed to clean things up. [ Stable folks: 2.6.23 bugfix ] Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Stable Kernel <stable@kernel.org>		18 years ago
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Kconfig	i386: move xen	18 years ago
Makefile	i386: move xen	18 years ago
enlighten.c	xen: deal with stale cr3 values when unpinning pagetables	18 years ago
events.c	i386: move xen	18 years ago
features.c	i386: move xen	18 years ago
manage.c	i386: move xen	18 years ago
mmu.c	xen: deal with stale cr3 values when unpinning pagetables	18 years ago
mmu.h	i386: move xen	18 years ago
multicalls.c	xen: add batch completion callbacks	18 years ago
multicalls.h	xen: add batch completion callbacks	18 years ago
setup.c	i386: move xen	18 years ago
smp.c	xen: yield to IPI target if necessary	18 years ago
time.c	xen: yield to IPI target if necessary	18 years ago
vdso.h	i386: move xen	18 years ago
xen-asm.S	i386: move xen	18 years ago
xen-head.S	i386: move xen	18 years ago
xen-ops.h	xen: deal with stale cr3 values when unpinning pagetables	18 years ago