3) NEW QEMU (w/ backport) GUEST: Bionic
#### REGULAR QEMU GUEST IN NEW QEMU
Spectre and Meltdown mitigation detection tool v0.42-1-g91d0699
Checking for vulnerabilities on current system Kernel is Linux
4.18.0-23-generic #24~18.04.1-Ubuntu SMP Thu Jun 13 17:08:52 UTC 2019 x86_64
CPU is Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz
-------
Hardware check
* Hardware support (CPU microcode) for mitigation techniques
* Indirect Branch Restricted Speculation (IBRS)
* SPEC_CTRL MSR is available: YES
* CPU indicates IBRS capability: YES (SPEC_CTRL feature bit)
* Indirect Branch Prediction Barrier (IBPB)
* PRED_CMD MSR is available: YES
* CPU indicates IBPB capability: YES (SPEC_CTRL feature bit)
* Single Thread Indirect Branch Predictors (STIBP)
* SPEC_CTRL MSR is available: YES
* CPU indicates STIBP capability: NO
* Speculative Store Bypass Disable (SSBD)
* CPU indicates SSBD capability: YES (Intel SSBD)
* L1 data cache invalidation
* FLUSH_CMD MSR is available: NO
* CPU indicates L1D flush capability: NO
* Microarchitecture Data Sampling
* VERW instruction is available: YES (MD_CLEAR feature bit)
* Enhanced IBRS (IBRS_ALL)
* CPU indicates ARCH_CAPABILITIES MSR availability: YES
* ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: YES
* CPU explicitly indicates not being vulnerable to Meltdown/L1TF (RDCL_NO):
YES
* CPU explicitly indicates not being vulnerable to Variant 4 (SSB_NO): NO
* CPU/Hypervisor indicates L1D flushing is not necessary on this system: YES
* Hypervisor indicates host CPU might be vulnerable to RSB underflow (RSBA):
NO
* CPU explicitly indicates not being vulnerable to Microarchitectural Data
Sampling (MDS_NO): NO
* CPU supports Software Guard Extensions (SGX): NO
* CPU microcode is known to cause stability problems: NO (model 0x55 family
0x6 stepping 0x6 ucode 0x1 cpuid 0x50656)
* CPU microcode is the latest known available version: NO (latest version
is 0x4000024 dated 2019/04/07 according to builtin MCExtractor DB v112 -
2019/05/22)
--------
* CPU vulnerability to the speculative execution attack variants
* Vulnerable to CVE-2017-5753 (Spectre Variant 1, bounds check bypass): YES
* Vulnerable to CVE-2017-5715 (Spectre Variant 2, branch target injection):
YES
* Vulnerable to CVE-2017-5754 (Variant 3, Meltdown, rogue data cache load):
NO
* Vulnerable to CVE-2018-3640 (Variant 3a, rogue system register read): YES
* Vulnerable to CVE-2018-3639 (Variant 4, speculative store bypass): YES
* Vulnerable to CVE-2018-3615 (Foreshadow (SGX), L1 terminal fault): NO
* Vulnerable to CVE-2018-3620 (Foreshadow-NG (OS), L1 terminal fault): NO
* Vulnerable to CVE-2018-3646 (Foreshadow-NG (VMM), L1 terminal fault): NO
* Vulnerable to CVE-2018-12126 (Fallout, microarchitectural store buffer data
sampling (MSBDS)): YES
* Vulnerable to CVE-2018-12130 (ZombieLoad, microarchitectural fill buffer
data sampling (MFBDS)): YES
* Vulnerable to CVE-2018-12127 (RIDL, microarchitectural load port data
sampling (MLPDS)): YES
* Vulnerable to CVE-2019-11091 (RIDL, microarchitectural data sampling
uncacheable memory (MDSUM)): YES
--------
## CVE-2017-5753 aka 'Spectre Variant 1, bounds check bypass'
* Mitigated according to the /sys interface: YES (Mitigation: __user pointer
sanitization)
* Kernel has array_index_mask_nospec: YES (1 occurrence(s) found of x86 64
bits array_index_mask_nospec())
* Kernel has the Red Hat/Ubuntu patch: NO
* Kernel has mask_nospec64 (arm64): NO
> STATUS: NOT VULNERABLE (Mitigation: __user pointer sanitization)
## CVE-2017-5715 aka 'Spectre Variant 2, branch target injection'
* Mitigated according to the /sys interface: YES (Mitigation: Enhanced IBRS,
IBPB: conditional, RSB filling)
* Mitigation 1
* Kernel is compiled with IBRS support: YES
* IBRS enabled and active: YES
* Kernel is compiled with IBPB support: YES
* IBPB enabled and active: YES
* Mitigation 2
* Kernel has branch predictor hardening (arm): NO
* Kernel compiled with retpoline option: YES
* Kernel supports RSB filling: YES
> STATUS: NOT VULNERABLE (IBRS + IBPB are mitigating the
vulnerability)
## CVE-2017-5754 aka 'Variant 3, Meltdown, rogue data cache load'
* Mitigated according to the /sys interface: YES (Not affected)
* Kernel supports Page Table Isolation (PTI): YES
* PTI enabled and active: NO
* Reduced performance impact of PTI: YES (CPU supports INVPCID, performance
impact of PTI will be greatly reduced)
* Running as a Xen PV DomU: NO
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as
not vulnerable)
## CVE-2018-3640 aka 'Variant 3a, rogue system register read'
* CPU microcode mitigates the vulnerability: YES
> STATUS: NOT VULNERABLE (your CPU microcode mitigates the
vulnerability)
## CVE-2018-3639 aka 'Variant 4, speculative store bypass'
* Mitigated according to the /sys interface: YES (Mitigation: Speculative
Store Bypass disabled via prctl and seccomp)
* Kernel supports disabling speculative store bypass (SSB): YES (found in
/proc/self/status)
* SSB mitigation is enabled and active: YES (per-thread through prctl)
* SSB mitigation currently active for selected processes: YES
(systemd-journald systemd-logind systemd-timesyncd systemd-udevd)
> STATUS: NOT VULNERABLE (Mitigation: Speculative Store Bypass
disabled via prctl and seccomp)
## CVE-2018-3615 aka 'Foreshadow (SGX), L1 terminal fault'
* CPU microcode mitigates the vulnerability: N/A
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as
not vulnerable)
## CVE-2018-3620 aka 'Foreshadow-NG (OS), L1 terminal fault'
* Mitigated according to the /sys interface: YES (Not affected)
* Kernel supports PTE inversion: YES (found in kernel image)
* PTE inversion enabled and active: NO
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as
not vulnerable)
## CVE-2018-3646 aka 'Foreshadow-NG (VMM), L1 terminal fault'
* Information from the /sys interface: Not affected
* This system is a host running a hypervisor: NO
* Mitigation 1 (KVM)
* EPT is disabled: NO
* Mitigation 2
* L1D flush is supported by kernel: YES (found flush_l1d in kernel image)
* L1D flush enabled: NO
* Hardware-backed L1D flush supported: NO (flush will be done in software,
this is slower)
* Hyper-Threading (SMT) is enabled: NO
> STATUS: NOT VULNERABLE (your CPU vendor reported your CPU model as
not vulnerable)
## CVE-2018-12126 aka 'Fallout, microarchitectural store buffer data
sampling (MSBDS)'
* Mitigated according to the /sys interface: YES (Mitigation: Clear CPU
buffers; SMT Host state unknown)
* Kernel supports using MD_CLEAR mitigation: YES (md_clear found in
/proc/cpuinfo)
* Kernel mitigation is enabled and active: YES
* SMT is either mitigated or disabled: NO
> STATUS: NOT VULNERABLE (Mitigation: Clear CPU buffers; SMT Host
state unknown)
## CVE-2018-12130 aka 'ZombieLoad, microarchitectural fill buffer data
sampling (MFBDS)'
* Mitigated according to the /sys interface: YES (Mitigation: Clear CPU
buffers; SMT Host state unknown)
* Kernel supports using MD_CLEAR mitigation: YES (md_clear found in
/proc/cpuinfo)
* Kernel mitigation is enabled and active: YES
* SMT is either mitigated or disabled: NO
> STATUS: NOT VULNERABLE (Mitigation: Clear CPU buffers; SMT Host
state unknown)
## CVE-2018-12127 aka 'RIDL, microarchitectural load port data sampling
(MLPDS)'
* Mitigated according to the /sys interface: YES (Mitigation: Clear CPU
buffers; SMT Host state unknown)
* Kernel supports using MD_CLEAR mitigation: YES (md_clear found in
/proc/cpuinfo)
* Kernel mitigation is enabled and active: YES
* SMT is either mitigated or disabled: NO
> STATUS: NOT VULNERABLE (Mitigation: Clear CPU buffers; SMT Host
state unknown)
## CVE-2019-11091 aka 'RIDL, microarchitectural data sampling
uncacheable memory (MDSUM)'
* Mitigated according to the /sys interface: YES (Mitigation: Clear CPU
buffers; SMT Host state unknown)
* Kernel supports using MD_CLEAR mitigation: YES (md_clear found in
/proc/cpuinfo)
* Kernel mitigation is enabled and active: YES
* SMT is either mitigated or disabled: NO
> STATUS: NOT VULNERABLE (Mitigation: Clear CPU buffers; SMT Host
state unknown)
--------
> SUMMARY:
CVE-2017-5753:OK
CVE-2017-5715:OK
CVE-2017-5754:OK
CVE-2018-3640:OK
CVE-2018-3639:OK
CVE-2018-3615:OK
CVE-2018-3620:OK
CVE-2018-3646:OK
CVE-2018-12126:OK
CVE-2018-12130:OK
CVE-2018-12127:OK
CVE-2019-11091:OK
--------
$ sudo /usr/bin/qemu-system-x86_64 -name guest="guest" -machine accel=kvm -cpu
host,arch_capabilities=on,ssbd=on,md-clear=on,
wbnoinvd=off,ibpb=off,virt-ssbd=off,rdctl-no=yes,ibrs-all=yes,rsba=yes,skip-l1dfl-vmentry=yes,ssb-no=yes
-m 2048 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid
7e55c71a-558f-412c-8445-db0e95fc549f -display none -no-user-config -nodefaults
-rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-shutdown
-global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on
-kernel /var/lib/libvirt/images/guest/vmlinuz -initrd
/var/lib/libvirt/images/guest/initrd.img -append "root=/dev/vda noresume
console=tty0 console=ttyS0,38400n8 apparmor=0 net.ifnames=0 crashkernel=256M"
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/var/lib/libvirt/images/guest/disk01.ext4.qcow2,format=qcow2,if=none,id=drive-virtio-disk0
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on
-serial stdio
HOST DOES NOT SUPPORT:
wbnoinvd
ibpb
virt-ssbd
rsba
ssb-no
2019-06-21T13:06:03.833616Z qemu-system-x86_64: warning: host doesn't support
requested feature: CPUID.80000008H:EBX.wbnoinvd [bit 9]
2019-06-21T13:06:03.833648Z qemu-system-x86_64: warning: host doesn't support
requested feature: CPUID.80000008H:EBX.ibpb [bit 12]
2019-06-21T13:06:03.833652Z qemu-system-x86_64: warning: host doesn't support
requested feature: CPUID.80000008H:EBX.virt-ssbd [bit 25]
2019-06-21T13:43:40.851310Z qemu-system-x86_64: warning: host doesn't support
requested feature: MSR(10AH).rsba [bit 2]
2019-06-21T13:43:40.851339Z qemu-system-x86_64: warning: host doesn't support
requested feature: MSR(10AH).ssb-no [bit 4]
inaddy@guest:~/spectre-meltdown-checker$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 85
model name : Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz
stepping : 6
microcode : 0x1
cpu MHz : 2095.076
cache size : 16384 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
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 ss syscall nx pdpe1gb rdtscp lm
constant_tsc arch_perfmon rep_good nopl xtopology cpuid tsc_known_freq pni
pclmulqdq vmx ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm
3dnowprefetch cpuid_fault invpcid_single ssbd ibrs ibpb ibrs_enhanced
tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep
bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb
avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves arat umip pku ospke
avx512_vnni md_clear arch_capabilities
bugs : spectre_v1 spectre_v2 spec_store_bypass mds
bogomips : 4190.15
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1828495
Title:
[KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM.
Status in intel:
New
Status in linux package in Ubuntu:
Confirmed
Status in qemu package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
New
Status in qemu source package in Bionic:
Confirmed
Status in linux source package in Cosmic:
New
Status in qemu source package in Cosmic:
Confirmed
Status in linux source package in Disco:
New
Status in qemu source package in Disco:
Confirmed
Status in linux source package in Eoan:
Confirmed
Status in qemu source package in Eoan:
Confirmed
Bug description:
[Impact]
* QEMU does not support IceLake and CascadeLake CPUs specific features.
* Most important feature to be supported is: IA32_ARCH_CAPABILITIES MSR.
* With IA32_ARCH_CAPABILITIES, QEMU is able to advertise HW mitigations:
- Rogue Data Cache Load
- Enhanced IBRS
- RSB Alternate
- L1D flush need on VMENTRY
- speculative Store Bypass
to guests, as described in document:
Intel 336996-Speculative-Execution-Side-Channel-Mitigations.pdf
[Test Case]
* From Original Description:
"""
1. Boot up guest using: -cpu Cascadelake-Server
[root@clx-2s2 yexin]# qemu-system-x86_64 -accel kvm -drive
if=virtio,id=hd,file=/home/x/x,format=qcow2 -m 4096 -smp 4 -cpu
Cascadelake-Server -serial stdio
char device redirected to /dev/pts/3 (label serial0)
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.07H:ECX [bit 4]
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.07H:ECX [bit 4]
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.07H:ECX [bit 4]
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.07H:ECX [bit 4]
2. To check CPU ID related to features[FEAT_7_0_EDX]
：CPUID_7_0_EDX_ARCH_CAPABILITIES
Expected Result: Both host and guest's CPUID.07H EDX bit 29 should be
1.
Actual Result:
Host's cpuid: 0x00000007 0x00: eax=0x00000000 ebx=0xd39ffffb
ecx=0x00000818 edx=0xbc000000 (EDX bit 29=1)
Guest's cpuid : 0x00000007 0x00: eax=0x00000000 ebx=0xd19f0fb9
ecx=0x00000818 edx=0x84000000 (EDX bit 29=0)
Commit:2bdb76c015df7125783d8394d6339d181cb5bc30
Target Kerned: 5.1
Target Release: 19.10
"""
[Regression Potential]
* Most changes are related to CPU type definitions and its supported
features. They are all based in upstream changes but, for obvious
reasons, backporting and/or cherry-picking those could bring issues.
Biggest concern is breaking something that currently works. Right now,
the parts being changed that could affect other CPU types would be
related to a small refactoring of how the features are organized, and
that would be seen right away when trying to start a new VM after the
package is installed.
* Other tests, related to the features being backported, are being
done by our KVM regression tests, including migration combinations, to
reduce chances that a regression is introduced.
[Other Info]
* N/A
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