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    SubjectRe: [PATCH RESEND] x86/speculation: Fix user-mode spectre-v2 protection with KERNEL_IBRS
    On Mon, Feb 20, 2023 at 06:46:04PM +0100, Borislav Petkov wrote:
    > On Mon, Feb 20, 2023 at 08:34:42AM -0800, Josh Poimboeuf wrote:
    > > We will never enable IBRS in user space. We tried that years ago and it
    > > was very slow.
    >
    > Then I don't know what this is trying to fix.
    >
    > We'd need a proper bug statement in the commit message what the problem
    > is. As folks have established, the hw vuln mess is a whole universe of
    > crazy. So without proper documenting, this spaghetti madness will be
    > completely unreadable.

    Agreed, and there seems to be a lot of confusion around this patch. I
    think I understand the issue, let me write up a new patch which is
    hopefully clearer.

    --
    Josh

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