x86/xen: Zero MSR_IA32_SPEC_CTRL before suspend

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Older Xen versions (4.5 and before) might have problems migrating pv
guests with MSR_IA32_SPEC_CTRL having a non-zero value. So before
suspending zero that MSR and restore it after being resumed.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Cc: stable@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
Cc: boris.ostrovsky@oracle.com
Link: https://lkml.kernel.org/r/20180226140818.4849-1-jgross@suse.com

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Juergen Gross 2018-02-26 15:08:18 +01:00 • committed by Thomas Gleixner

parent 946fbbc13d

commit 71c208dd54

1 changed files with 16 additions and 0 deletions

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arch/x86/xen/suspend.c

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