On Tue, Mar 21, 2023 at 2:43 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > 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 > Ha! As I wrote way back when, "It is more forward-thinking to provide this capability than it is not to." I feel vindicated. :)
