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    SubjectRe: [patch RFC 5/5] x86/speculation: Add basic speculation control code
    On Wed, Jan 10, 2018 at 12:12:53PM +0000, David Woodhouse wrote:
    > IBRS is like a barrier. You must write it between the 'problematic'
    > loading of the branch targets, and the kernel code which might be
    > affected.
    >
    > You cannot, on current hardware, merely set it once and forget about
    > it. That is not sufficient.

    I think you've got it all wrong...

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