Here is a backport of this stable patch for pre-4.4 kernels (before the advent of X86_FEATURE_XENPV): b7a58459 x86/iopl/64: Properly context-switch IOPL on Xen PV Supplied backports: - [3.2 backport] - [3.x backport] (for 3.4 through 3.19) - [4.x backport] (for 4.1 and 4.2) -Kamal ---------- Andy Lutomirski (1): x86/iopl/64: Properly context-switch IOPL on Xen PV arch/x86/include/asm/xen/hypervisor.h | 2 ++ arch/x86/kernel/process_64.c | 12 ++++++++++++ arch/x86/xen/enlighten.c | 2 +- 3 files changed, 15 insertions(+), 1 deletion(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html