With current firmware from Dell (1.9.1) and current intel-microcode
package, the problem is resolved.
# LANG=C lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 39 bits physical, 48 bits virtual
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 142
Model name: Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
Stepping: 12
CPU MHz: 2561.665
CPU max MHz: 4800.0000
CPU min MHz: 400.0000
BogoMIPS: 4199.88
Virtualization: VT-x
L1d cache: 128 KiB
L1i cache: 128 KiB
L2 cache: 1 MiB
L3 cache: 8 MiB
NUMA node0 CPU(s): 0-7
Vulnerability Itlb multihit: KVM: Mitigation: Split huge pages
Vulnerability L1tf: Not affected
Vulnerability Mds: Not affected
Vulnerability Meltdown: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass
disabled via prctl and seccomp
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and
__user pointer sanitization
Vulnerability Spectre v2: Mitigation; Enhanced IBRS, IBPB
conditional, RSB filling
Vulnerability Srbds: Mitigation; TSX disabled
Vulnerability Tsx async abort: Mitigation; TSX disabled
Flags: fpu vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat pse36 clflush dts ac
pi mmx fxsr sse sse2 ss ht tm pbe syscall
nx pdpe1gb rdtscp lm constant_tsc art arch_p
erfmon pebs bts rep_good nopl xtopology
nonstop_tsc cpuid aperfmperf pni pclmulqdq dte
s64 monitor ds_cpl vmx smx est tm2 ssse3
sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2
apic movbe popcnt tsc_deadline_timer aes
xsave avx f16c rdrand lahf_lm abm 3dnowprefet
ch cpuid_fault epb invpcid_single ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi f
lexpriority ept vpid ept_ad fsgsbase
tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx r
dseed adx smap clflushopt intel_pt
xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln
pts hwp hwp_notify hwp_act_window hwp_epp
md_clear flush_l1d arch_capabilities
# dmesg | grep micro
[ 0.693997] microcode: sig=0x806ec, pf=0x80, revision=0xd6
[ 0.694243] microcode: Microcode Update Driver: v2.2.
# dpkg -l | grep -E 'intel-microcode|linux-image-amd64'
ii intel-microcode 3.20200616.1
amd64 Processor microcode firmware for Intel CPUs
ii linux-image-amd64 5.7.6-1
amd64 Linux for 64-bit PCs (meta-package)
