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    SubjectRe: [PATCH 0/3] KVM: support the cpu feature FLUSH_L1D
    On Mon, Mar 20, 2023 at 5:52 PM Jim Mattson <jmattson@google.com> wrote:
    > > Patch 1 and 2 are just taken and refactored from Jim Mattison's serie that it
    > > seems was lost a while ago:
    > > https://patchwork.kernel.org/project/kvm/patch/20180814173049.21756-1-jmattson@google.com/
    > >
    > > I thought it was worth re-posting them.
    >
    > What has changed since the patches were originally posted, and Konrad
    > dissed them?

    What has changed is that the reporting of mmio_stale_data now
    piggybacks on flush_l1d as well.

    if ((ia32_cap & ARCH_CAP_FB_CLEAR) ||
    (boot_cpu_has(X86_FEATURE_MD_CLEAR) &&
    boot_cpu_has(X86_FEATURE_FLUSH_L1D) &&
    !(ia32_cap & ARCH_CAP_MDS_NO)))
    mmio_mitigation = MMIO_MITIGATION_VERW;
    else
    mmio_mitigation = MMIO_MITIGATION_UCODE_NEEDED;

    Maybe Intel only defines CPUID bits after a firstborn has been
    sacriificed to the microcode gods?

    Paolo

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