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xen: restore vcpu_info mapping

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If we're using vcpu_info mapping, then make sure its restored on all
processors before relasing them from stop_machine.

The only complication is that if this fails, we can't continue because
we've already made assumptions that the mapping is available (baked in
calls to the _direct versions of the functions, for example).

Fortunately this can only happen with a 32-bit hypervisor, which may
possibly run out of mapping space.  On a 64-bit hypervisor, this is a
non-issue.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-05-31 01:33:02 +01:00
committed by Ingo Molnar
parent e2426cf85f
commit 9c7a794209
3 changed files with 33 additions and 2 deletions
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4
arch/x86/xen/suspend.c
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@@ -26,6 +26,8 @@ void xen_pre_suspend(void)
void xen_post_suspend(int suspend_cancelled)
{
xen_setup_shared_info();
if (suspend_cancelled) {
xen_start_info->store_mfn =
pfn_to_mfn(xen_start_info->store_mfn);
@@ -35,8 +37,8 @@ void xen_post_suspend(int suspend_cancelled)
#ifdef CONFIG_SMP
xen_cpu_initialized_map = cpu_online_map;
#endif
xen_vcpu_restore();
}
xen_setup_shared_info();
}