On 08/23/2018 07:22 PM, Andre Tomt wrote: > On 23. aug. 2018 17:44, Andi Kleen wrote: >> On Thu, Aug 23, 2018 at 03:44:18PM +0200, Vlastimil Babka wrote: >>> Two users have reported [1] that they have an "extremely unlikely" >>> system >>> with more than MAX_PA/2 memory and L1TF mitigation is not effective. >>> In fact >>> it's a CPU with 36bits phys limit (64GB) and 32GB memory, but due to >>> holes >>> in the e820 map, the main region is almost 500MB over the 32GB limit: >> >> Ah I see it's a client part with very large DIMMs and someone being >> very brave and using that much memory without ECC. > > FYI; It is also happening on Xeon E3v2 (Ivy Bridge generation) w/ 32GB > of ECC RAM here, a low-end server part that officially supports up to > 32GB. > Indeed, I must be "very brave" to not have chucked this CPU and motherboard and RAM in the bin, and bought a new board, Xeon CPU, and ECC RAM. Maybe I'll consider that in the future, when I again have $1000+ to buy new kit. Which will probably be never, at this rate. >> [ 0.000000] microcode: microcode updated early to revision 0x20, >> date = 2018-04-10 >> [ 0.029728] L1TF: System has more than MAX_PA/2 memory. L1TF >> mitigation not effective. >> [ 1.063155] microcode: sig=0x306a9, pf=0x2, revision=0x20 > > >> processor : 7 >> vendor_id : GenuineIntel >> cpu family : 6 >> model : 58 >> model name : Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz >> stepping : 9 >> microcode : 0x20 >> cpu MHz : 3500.044 >> cache size : 8192 KB >> physical id : 0 >> siblings : 8 >> core id : 3 >> cpu cores : 4 >> apicid : 7 >> initial apicid : 7 >> fpu : yes >> fpu_exception : yes >> cpuid level : 13 >> wp : yes >> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge >> mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe >> syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl >> xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor >> ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic >> popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm >> cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority >> ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts flush_l1d >> bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf >> bogomips : 6602.15 >> clflush size : 64 >> cache_alignment : 64 >> address sizes : 36 bits physical, 48 bits virtual >> power management: > >
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