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Date: Sun, 21 Jan 2018 14:23:15 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Nick Lowe <nick.lowe@gmail.com>
Cc: stable@vger.kernel.org
Subject: Re: AMD GX-412TC flagged as being vulnerable to Meltdown in 4.9.77
Message-ID: <20180121132315.GA3769@kroah.com>
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On Sun, Jan 21, 2018 at 12:43:43PM +0000, Nick Lowe wrote:
> Hi,
> 
> On an APU2C4 which uses a AMD GX-412TC SOC, this is incorrectly
> flagged as being vulnerable to Meltdown in 4.9.77
> 
> root@LEDE:/sys/devices/system/cpu/vulnerabilities# cat meltdown
> Vulnerable
> 
> root@LEDE:/sys/devices/system/cpu/vulnerabilities# cat /proc/cpuinfo
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 22
> model : 48
> model name : AMD GX-412TC SOC
> stepping : 1
> microcode : 0x7030105
> cpu MHz : 600.000
> cache size : 2048 KB
> physical id : 0
> siblings : 4
> core id : 0
> cpu cores : 4
> apicid : 0
> initial apicid : 0
> 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 mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
> pdpe1gb rdtscp lm constant_tsc rep_good acc_power nopl nonstop_tsc
> extd_apicid aperfmperf eagerfpu pni pclmulqdq monitor ssse3 cx16
> sse4_1 sse4_2 movbe popcnt aes xsave avx f16c lahf_lm cmp_legacy svm
> extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit
> wdt topoext perfctr_nb bpext ptsc perfctr_l2 cpb hw_pstate retpoline
> retpoline_amd vmmcall bmi1 xsaveopt arat npt lbrv svm_lock nrip_save
> tsc_scale flushbyasid decodeassists pausefilter pfthreshold
> overflow_recov
> bugs : fxsave_leak sysret_ss_attrs null_seg cpu_meltdown spectre_v1 spectre_v2
> bogomips : 1996.12
> TLB size : 1024 4K pages
> clflush size : 64
> cache_alignment : 64
> address sizes : 40 bits physical, 48 bits virtual
> power management: ts ttp tm 100mhzsteps hwpstate cpb acc_power [13]
> 
> <snip>

What does the latest 4.14.y release, or Linus's tree show for this CPU?

thanks,

greg k-h