On Mon, Mar 20, 2023 at 5:52 PM Jim Mattson <jmattson@xxxxxxxxxx> 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@xxxxxxxxxx/ > > > > 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
