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Andrew Cooper
71ca0e0ad0
To combat the absence of mitigating microcode, arrange to hide RDRAND by default on IvyBridge client hardware. Adjust the default feature derivation to hide RDRAND on IvyBridge client parts, unless `cpuid=rdrand` is explicitly provided. Adjust the restore path in xc_cpuid_apply_policy() to not hide RDRAND from VMs which migrated from pre-4.14. In all cases, individual guests can continue using RDRAND if explicitly enabled in their config files. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Release-acked-by: Paul Durrant <paul@xen.org>
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