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    SubjectRe: [PATCH] x86/speculation: Add document to describe Spectre and its mitigations
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    On 1/14/2019 5:06 AM, Jiri Kosina wrote:
    > On Mon, 14 Jan 2019, Pavel Machek wrote:
    >
    >> Frankly I'd not call it Meltdown, as it works only on data in the cache,
    >> so the defense is completely different. Seems more like a l1tf
    >> :-).
    >
    > Meltdown on x86 also seems to work only for data in L1D, but the pipeline
    > could be constructed in a way that data are actually fetched into L1D
    > before speculation gives up, which is not the case on ppc (speculation
    > aborts on L2->L1 propagation IIRC). That's why flushing L1D on ppc is
    > sufficient, but on x86 it's not.

    assuming L1D is not shared between SMT threads obviously :)

    >

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