Qemu cpu flags. This bug affects 1 person.

Qemu cpu flags e. ===== host os: fedora 14 each guest gets 8 cpus and 4gig ram. 5. In particular this does not have the v6K features. 0 and it offers way more CPU flags and features! You can use QEMU with a nearly native full virtualization. henderson@linaro. If the CPU flags passed to the guest are missing, the qemu process will stop. Most of it is crap. -display sdl - Display video output via SDL (usually in a separate graphics window). Benefits of changing: cpu_map. This log will appear repeatedly and take up storage space. It is not practical to have a database listing all known CPU models, so libvirt has The latest version of QEMU is 6. /a. 256K L3 cache: 15360K NUMA node0 CPU(s): 0-5,12-17 NUMA node1 CPU(s): 6-11,18-23 Flags: You signed in with another tab or window. 608609+08:00 nanopi pvestatd[1567]: QEMU/KVM cannot detect CPU flags on ARM (aarch64) 2024-03-19T13:53:26. This is expected, because this feature set is the common denominator between all modern AMD and Intel CPUs of the v3 baseline (basically the only guaranteed baseline to work for consumer CPUs in 2024 2024-03-19T13:53:26. This is what happens when i try the different CPU modes in KVM/QEMU on TrueNAS. 0) is expected. [Qemu-devel] [PATCH 0/2] clean up cpu_dump_state flags Peter Maydell Tue, 07 Aug 2012 06:51:53 -0700 This is a small cleanup patchset which moves some cpu_dump_state flags from being x86 only to being generic, since the extra info they ask for is not particularly x86 specific (many of our target architectures have an fpu, and similarly several implement the TCG Atomic operations in QEMU CPUs perform independent memory operations effectively in random order. but this can be a problem for CPU-CPU interaction Bare use of atomic operations and memory barriers should be limited to inter-thread checking of flags and documented thoroughly. If the CPU flags passed to the guest are missing, the QEMU process will stop. Contribute to coreos/qemu development by creating an account on GitHub. My host server has the SSSE3 flag enabled (output cut for brevit Host passthrough so I could forward all flags: <cpu mode='host-passthrough'> <topology sockets='1' cores='1' threads='1'/> </cpu> Just enabling the SSSE3 flag: From where the cpu capabilites are exposed to libvirt VM's? We are able the see different cpu capabilities from different sources. The definitions exposed by libvirt could be completely different from the definitions in QEMU, as long as libvirt probes for CPU model information and uses the right flags in the command-line to make QEMU expose what libvirt users expect. 1,+sse4. You switched accounts on another tab or window. Signed-off-by: Wolfgang Bumiller <***@proxmox. Maybe can you create a promxox bugzilla? like this we don't forgot your suggestion. So Is it possible to compile qemu in a way that i do not enter "-enable-kvm" flage from . Contribute to nccgroup/TriforceAFL development by creating an account on GitHub. Attaching gdb. Spectre and Meltdown mitigation detection tool. The suggested testboard only instantiates memory and a CPU, and thus no I/O is possible. The CPU handling in QEMU and libvirt is rather complicated, non-obvious and with historical baggage that QEMU documentation. If an application does not wish to do perform any host compatibility checks before launching guests, the default is guaranteed to work. 6. kvmclock my cpu is set to host from Proxmox GUI and shows as: cpu: host in the vm conf file. Toremedy this QEMU has also its own virtual CPU types, that Proxmox VE uses by default. 2. Paravirtualized KVM features Description . No problem. This bug affects 1 person. Though, it seems that -cpu host does indeed behave in the way you describe. Custom CPU models can specify any flag supported by QEMU/KVM, VM-specific flags must be from the following set for security reasons: pcid, spec-ctrl, ibpb, ssbd, virt-ssbd, amd-ssbd, amd-no-ssb, pdpe1gb, md-clear, hv-tlbflush, hv-evmcs, aes qemu -cpu qemu64,+ssse3,+sse4. In comparison to host-model which simply matches feature flags, host-passthrough ensures every last detail of the host CPU is matched. i3-6100T would be "Skylake-Client" CPU by their definition. QEMU/KVM and libvirt use a scheme which combines a CPU model name string, with a set of named flags. QEMU 2. Validated The recent "Meltdown" CVE fixes have resulted in a critical performance penalty[*] that will impact every Nova guest with certain CPU models. Note also that since 7. qemu32 and qemu64 are basic CPU models but there are other models (with additional features) available. Here are some important tips for the No Hyper-V enlightenments are enabled by default by either KVM or QEMU. all-you-can-enable: Enable every single bit that can be enabled, including the ones not present on the host but that can be emulated. jitted perf report -i perf. data. ti will be good to use the same flags than gcc -march=name[option] [1] Maybe a new cpu arm-gcc-march-name[option]? For now I use: This spec will allow Nova [2] to do fine-grained validation of a given CPU model plus CPU flags against a specific QEMU binary (and KVM) to allow well-informed guest CPU configuration decisions. My host server has the SSSE3 flag enabled (output cut for brevity): List of additional CPU flags separated by ;. So I want to choose one from the QEMU CPU types. How to change cputune dynamic? Hot Network Questions How should I handle skill contests between two equally active participants? If the moon was covered in blood, would it achieve the visual effect of deep red moonlight under a full moon? How A previous post detailed how QEMU/KVM might be affected by Spectre/Meltdown attacks, and what the plan was to mitigate them in QEMU 2. 2,+x2apic. $ qemu-system-i386 -cpu pentium3,enforce (-UP-) cache: 16384 KB speed: 3292 MHz (max) CPU Flags: apic cmov cx8 de fpu fxsr hypervisor mca mce mmx msr mtrr pae pge pse pse36 sep sse tsc x2apic $ firefox # v. org> To: qemu-devel@nongnu. Because this setup requires a specific configuration for every Linux distro if we do not just add the bridge manually it is separated in this howto. com> TimelineofrecentCPUflaws,2018(a) Jan03• Spectrev1: BoundsCheckBypass Jan03• Spectrev2: BranchTargetInjection Jan03• Meltdown: RogueDataCacheLoad May21• Spectre-NG:SpeculativeStore Bypass Jun21• TLBleed: Side-channelattackover sharedTLBs 2/38 AFL/QEMU fuzzing with full-system emulation. To do that I wanted to use /proc/cpuinfo and The examples below illustrate the approach to configuring the various CPU models / features in QEMU and libvirt. The following features are enabled by default for any CPU model when KVM acceleration is enabled:. 24 CPUs in total. I think that this is impossible to implement, because This uses the QEMU “Named model” feature, automatically picking a CPU model that is similar the host CPU, and then adding extra features to approximate the host model as closely as possible. The AES instruction set goes back to 2008 with the first CPUs supporting it in 2010 it seems. For AVX and other new instruction set extensions, Intel provides an emulator: This works assuming that lscpu flags include avx in the Migration compatibility note: as backend id one shall use value of ‘default-ram-id’, advertised by machine type (available via query-machines QMP command), if migration to/from old QEMU (<5. Proxmox VE's Virtual Machine Manager. After recent predicaments I tried the following for CPU:-cpu Broadwell-noTSX-IBRS,hv-passthrough The CPU model is, according to command virsh capabilities, the “closest” to this host’s physical CPU Intel i5 1135g7. Are these ok considering the "hacky" nature of pimox? Jan 13 22:42:45 RPi4-PVE pvestatd[1081]: CPU flag detection failed, will try again after delay Jan 13 22:42:46 RPi4- Brief Anatomy: How Do We Setup ARM GIC During VM Init (2) 6 GIC Initialization (Qemu & KVM) Initialize GICV3 data structures (distributor, redistributor, cpu) in QEMU KVM VGIC CPU interface initialization (KVM_CREATE_VCPU) Initialize the GIC Distributor in KVM Various SPIs, vITS alloc etc. It is quite hard to check ABI conformance using qemu. We need a new set of user config keys to specify is SEV is enabled or not A not-too-complex proposal could look like this : AMD EPYC Milan CPU, libvirt/qemu incorrect L3 cache displayed using cpu-passthrough flag Bug #1998032 reported by Zain M on 2022-11-27. Currently this only allows specifying '+pcid' or '-pcid' but might be extended in the future. CPU(s): 24 vs 22. 11. List of additional CPU flags separated by ;. For QEMU CPU type compatibiliy, kvm64 (x86-64-v1): Compatible with Intel CPU Custom CPU models can specify any flag supported by QEMU/KVM, VM-specific flags must be from the following set for security reasons: pcid, spec-ctrl, ibpb, ssbd, virt-ssbd, amd-ssbd, amd-no-ssb, pdpe1gb, md-clear, hv-tlbflush, hv-evmcs, aes Hi, I assume it is NOT normal/correct that qemu-kvm "using" hardware acceleration with intel-vt shows a "Qemu Virtual CPU" to the guest instead of the original host cpu and it's extensions? I'm running a dual xeon 5620 server, intel-vt and all virtualization related bios settings are on. For CPU flags (aka CPU features) simply are attributes of CPU, denoted which features it supports. c, then build with your changes using makepkg -ei, but you would have to do this every time qemu updates. The problem is that some of the cpu feature flags don't get passed through when I run qemu with -cpu host. an older core than plain "arm1136". If the CPU flags passed to the guest are missing, the QEMU process will stop. Default topology usage . The QEMU CPU = does not support hardware AES-NI (QAT is intel only) and does not have a lot of the CPU flags a modern PC has. 5+ 4 CPUs: 1 package(s) x 4 core(s) AES-NI CPU Crypto: No QAT Crypto: No The Problem. org Cc: peter. (KVM_DEV_ARM_VGIC_CTRL_INIT) IO Devs and memory QEMU/KVM ONLY - Mitigations and CPU Flags. xml and QEMU won't need to match exactly, anymore. data -o perf. The content seems authentic on my VM. These documentation files can be browsed via the git web interface Display options. Custom CPU models can specify any flag supported by QEMU/KVM, VM-specific flags must be from the following set for security reasons: pcid, spec-ctrl, ibpb, ssbd, virt-ssbd, amd-ssbd, amd-no-ssb, pdpe1gb, md-clear, hv-tlbflush, hv-evmcs, aes QEMU/KVM cannot detect CPU flags on ARM (aarch64) #56. Result: Windows BSOD The thing is, if they use cpu=host and it turns out to be a very expensive CPU with no optimization, it won't make much sense to emulate. jitted Host passthrough¶. If you don’t care about live migration or have a homogeneous cluster where all nodes have the same CPU and same microcode version, set the CPU type to host, as in theory this will give your As stated here, kvm32/kvm64 are non-recomended x86 CPU, listed "just for historical compatibility with ancient QEMU versions", so the way to go is either: - Use qemu32/qemu64 CPU (lower performance and increased The resulting QEMU binary is essentially a standalone instrumentation tool; for an example of how to leverage it for other purposes, you can have a look at afl-showmap. So remove the flag argument and do it directly. Xilinx's fork of Quick EMUlator (QEMU) with improved support and modelling for the Xilinx platforms. apt-get install qemu-kvm bridge-utils STEP 3) QEMU Virtual CPU version 2. If you don't want to setup qemu and don't want to use compile flags the easiest is likely to find an older system. Reload to refresh your session. QEMU Developer’s Guide¶. In QEMU, individual enlightenments can be enabled through CPU flags, e. Für Ensure that all the libraries used by Qemu, and especially libvirt, are up to the right level. We created a VM with cpu mode 'host-passthrough' which didn't get all flags that shows in physical node lscpu flags. QEMU documentation. Check if the ID flag (bit 21) in the EFLAGS register is set, which indicates the availability of the CPUID instruction; Set the EAX and ECX registers to certain values; Call CPUID; Interpret the values of the EAX, EBX, ECX, and EDX registers; There are many sites convering the interpretation of the results. There are a few available options to specify the kind of display to use in QEMU. 977 seconds Benchmark Summary. Looking into it, I believe CPU models are defined in this file so you would have to manually edit and recompile QEMU. 11+dfsg-1ubuntu7. The features can be simple as calculating floating point unit, hyperthreading technology, or ability Retrieving the results from the CPUID instruction is quite simple:. QEMU / KVM CPU model configuration — QEMU documentation. I do want to choose host as the CPU type, but I am still hesitant to do that. to check the current flags on the VM CPU, use more /proc/cpuinfo | grep flags libvirt/src/cpu_map at master · libvirt/libvirt · GitHub - GitHub page with all of the QEMU CPU profiles, if you edit them you can see the CPU flags. Der "CPU Type" bestimmt, welche CPU emuliert wird, sprich welche flags dem Gast "durchgereicht" oder vorgegaukelt werden. This does not guarantee the CPU family, stepping, etc will precisely match the host CPU, as they would with “Host passthrough”, but gives much of the benefit of passthrough, STEP 2) Install QEMU. 1(Debian 1:2. If cpu_mode=host-passthrough, libvirt tells KVM to pass through the host CPU with no modifications. This gives the best performance, and can be important to some apps which check low level CPU details, QEMU Virtual CPU version 2. 1 (and eventually QEMU 2. The CPU topology can be specified on the QEMU command line with the -smp or the -device QEMU command arguments. (KVM_DEV_ARM_VGIC_CTRL_INIT) IO Devs and memory My QEMU version is qemu-kvm-1. g: qemu-system-x86_64 --enable-kvm --cpu host,hv_relaxed,hv_vpindex,hv_time, Sometimes there are dependencies between enlightenments, QEMU is supposed to check that the supplied configuration is sane. If you use gcc to build your guest binary, make sure you build using the old debug symbols. How do I get every supported CPU flags as QEMU CPU flags? 0. This article is an updated version of the old QEMU article about CPU flags available for version 2. 5+ - RandomX - 10MH - 8347. Skip to main content. gengsende opened this issue Apr 4, 2023 · 1 comment Comments. 0 and it offers way more CPU flags and features! There are more than 130 different CPU families and instruction sets to emulate. Paravirtualized KVM features are represented as CPU flags. First, we want to validate the presence of SME and SEV in the CPU flags. but the generic v3 instruction is definitely a subset of the host CPU's superset of feature flags. 0 – QEMU full virtualization – CPU emulations (enable/disable CPU flags/instruction sets) of QEMU 2. You could also try the qemu-kvm parameters of -cpu sandyBridge,+avx,enforce. out perf inject -j -i perf. The flags for gcc are -gdwarf-2 -gstrict-dwarf Now you can start QEMU qemu-system-tricore -M tricore_testboard -kernel /path/to/your/binary -s -S $ qemu-system-x86_64 --version QEMU emulator version 2. Cpu settings, the x64_x86aes or whats it called (pve8 default) is already a pretty good selection. maydell@linaro. Contribute to proxmox/qemu-server development by creating an account on GitHub. The set of CPU features presented to the guest by QEMU/KVM depends on the CPU model chosen in the guest virtual machine configuration. - Xilinx/qemu I see these over and over. QEMU CPU Types are virtual CPU types, compatible with both Intel and AMD host CPUs. Copy link haohetao commented Mar 8, 2024. Stack Overflow. This manual documents various parts of the internals of QEMU. If you want to do a live migration of VMs betweendifferent hosts, your VM might end up on a new system with a different CPU typeor a different microcode version. I. To remedy this QEMU has also its own virtual CPU types, that Proxmox VE uses by default. To check the flags, install WSL and `cat /proc/cpuinfo`. This includes the following flags: Thoughts - Making Sense of QEMU CPU Types. My QEMU version is qemu-kvm-1. You signed out in another tab or window. If you're on arch you can get the PKGBUILD here, download the sources with makepkg -os, edit cpu. Most of the documentation is generated automatically from the QEMU git source tree, however some text files have not been converted to the new format yet. Setup . . At the very beginning, Proxmox VE provides kvm64 CPU model. If you do have separate paths for each case just test them separately and assume that you check works (after all it works to detect that the extension is available). 9) $ qemu-system-x86_64 -cpu help Recognized CPUID flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 pn clflush ds acpi mmx fxsr sse sse2 ss ht tm ia64 pbe pni pclmulqdq dtes64 monitor ds-cpl vmx smx est tm2 ssse3 cid fma cx16 Host passthrough¶. This uses the QEMU “Named model” feature, automatically picking a CPU model that is similar the To see the difference between the capabilities of the host CPU versus the guest, just compare the output of the following commands on each system: grep flags /proc/cpuinfo | uniq. The latest version of QEMU is 6. Here are some important tips for the guest CPU Libvirt supports a third way to configure CPU models known as “Host model”. Why there are different cpu flag sets in /usr/share/libvirt/cpu_map/ and "virsh capabilities" Flag count is 133. Custom CPU models can specify any flag supported by QEMU/KVM, VM-specific flags must be from the following set for security reasons: pcid, spec-ctrl, ibpb, ssbd, virt-ssbd, amd-ssbd, amd-no-ssb, pdpe1gb, md-clear, hv-tlbflush, hv-evmcs, aes RetroPie with Orange Pi Zero 2w detection. 3. org Subject: [Qemu-devel] [PATCH 8/9] target/arm: Add ZCR. kvm64 is a Pentium 4 look a like CPU type, which has a reduced CPU flags set, but is I'm trying to do some OS development in qemu with kvm. I'm using x86-64, my host cpu is an Intel i7-6700K (Skylake). In libvirt, the CPU is specified by providing a base CPU model name (which is a shorthand for a set of feature flags), a set of additional feature flags, and the topology (sockets/cores/threads). The main documentation section is the first place to go in case you have questions about using QEMU. c. The latest version of QEMU is 8. In VM can see 22 CPUs available. These documentation files can be browsed via the git web interface Brief Anatomy: How Do We Setup ARM GIC During VM Init (2) 6 GIC Initialization (Qemu & KVM) Initialize GICV3 data structures (distributor, redistributor, cpu) in QEMU KVM VGIC CPU interface initialization (KVM_CREATE_VCPU) Initialize the GIC Distributor in KVM Various SPIs, vITS alloc etc. 2 threads are no longer supported in the topology and the -smp command line argument accepts Yes, running a guest with KVM acceleration (-enable-kvm option in qemu command line) can be done without -cpu host. org, qemu-arm@nongnu. This howto rather continues the previous one “Howto do QEMU full virtualization with MacVTap networking” with the exception it will be showed how to use a classic setup of the networking – the use of bridge device. pfsense runs fine. 0 and older, user shall use x-use-canonical-path-for-ramblock-id=off backend option if migration to/from old QEMU (<5. Openstack qemu-kvm is the virtualisation server running here. haohetao opened this issue Mar 8, 2024 · 0 comments Comments. It is the level of Pentium 4. I noticed that if I add an extra line in the conf file: args: -cpu host the VM is consistently faster (even in single core) Geekbench with only: cpu: host single core: 664 I stop and add args: -cpu host to it (keeping cpu: host). LEN to tb->flags Date: Mon, 18 Dec 2017 09:30:21 -0800 [thread overview] Message-ID: <20171218173022. Use +FLAG to enable, -FLAG to disable a flag. 2 CPUs pinned for openstack controller on VM host. How do I forward the SSSE3 flag from my host server to VM while using KVM? I tried the following. Also, Once the CPU flags are validated, we need to validate QEMU’s support for SEV through QMP’s query-sev-capabilities command. 1 is now available, and contains the aforementioned mitigation functionality for x86 guests, along with additional mitigation functionality for pseries and s390x guests (ARM guests Those CPU masks are probably from QEMU, not Proxmox, and some feedback should probably be given. In some cases when implementing hardware interfaces in software is slow, KVM implements its own paravirtualized interfaces. It seems like I need to force libvirtd to re-scan my CPU, or something. QEMU command line Host passthrough: qemu-system-x86_64 -cpu host. You signed in with another tab or window. Not changing the cpu type or flags can leave a lot of performance on the table for some workloads, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Having the topology disabled by default allows migration between old and new QEMU without adding new flags. See also if this thread is useful. Closed gengsende opened this issue Apr 4, 2023 · 1 comment Closed KunPeng 920 ARM syslog err[QEMU/KVM cannot detect CPU flags on ARM] #13. 0. You can use whatever you want. Why there are different cpu flag sets in /usr/share/libvirt/cpu_map/ and "virsh capabilities" The resulting QEMU binary is essentially a standalone instrumentation tool; for an example of how to leverage it for other purposes, you can have a look at afl-showmap. And you can't check for CPU pinning and stuff inside the VM. 617429+08:00 nanopi pvestatd[1567]: CPU flag detection failed, will try again after delay. 12). GitHub Gist: instantly share code, notes, and snippets. 18418-9-richard. At least, a note on qemu's wiki states that they intend it to behave that way. Under CentOS 7 you can just install couple of packets – that’s all you need: yum install -y qemu qemu-common qemu-img qemu-kvm-common qemu-system-x86 qemu-user bridge-utils Or under Ubuntu. In the case of -cpu qemu64,avx,pdpe1gb,check,enforce qemu will set the union of the virtual qemu64 cpu and avx,pdpe1gb,check,enforce features as cpu features for this guest. Any help would be appreciated as I don't fully understand every component of QEMU/KVM or where to start looking. Recommendations for KVM CPU model configuration on x86 hosts — QEMU documentation - Seems to be the same as the link below. Custom CPU models can specify any flag supported by QEMU/KVM, VM-specific flags must be from the following set for security reasons: pcid, spec-ctrl, ibpb, ssbd, virt-ssbd, amd-ssbd, amd-no-ssb, pdpe1gb, md-clear, hv-tlbflush, hv-evmcs, aes Task Manager in the guest shows constant 100% CPU usage, but the performance monitor in virt-manager shows constant 50% usage. The above is the suggestion from the wiki page. This gives the best performance, and can be important to some apps which check low level CPU details, From: Richard Henderson <richard. 54 which requires sse2; Runs just fine, as do AVX support is needed in QEMU, which can be added: using the following line in the VM configuration file: args: -cpu host (VM gets the same features as the host CPU, which might prevent other errors in the future) using the qemu-kvm CPU flag -cpu avx. To see the difference between the capabilities of the host CPU versus the guest, just compare the output of the following commands on each system: grep flags /proc/cpuinfo | uniq For example, the default setting on a 64 bit host machine is "-cpu qemu64". You only need to read it if you are interested in reading or modifying QEMU’s source code. assume you have applied all the "Meltdown" CVE fixes, and performed a cold reboot (explicit stop & start) If you care about live migration without security, or have mixed Intel/AMD cluster, choose the lowest compatible virtual QEMU CPU type. I'm specifically looking for 'est' (Enhanced SpeedStep). First I tried running QEMU vm with this model and all the flags =on listed by virsh command. The default QEMU CPU models are designed such that they can run on all hosts. How can I prevent this message from being generated? We created a VM with cpu mode 'host-passthrough' which didn't get all flags that shows in physical node lscpu flags. To remedy this Qemu has also its own CPU type kvm64, that Proxmox VE uses by defaults. First, I would not believe everything you read on the Internet. There are different tools that can be used to detect these vulnerabilities in an environment (Architecture, CPU, Firmware Levels, OS Kernel, Hypervisor Types and Versions) AND to show you if all of them are mitigated or not. When the Another update. After this change, there is nothing else using cpu_physical_memory_set_dirty_flags() so remove it. To use perf with QEMU is as simple as using the following three commands: perf record -k 1 qemu-x86_64 -perf . You could try passing configure --disable-tcg, which will disable the CPU emulation entirely List of additional CPU flags separated by ;. This is done by calling KVM's KVM_SET_CPUID2 ioctl. Affects nova/libvirt flag of cpu_mode = host-passthrough has been the most consistent for cpu performance then any of the other cpu_mode flags. In my QEMU virtual machine, I need to use a specific CPU model, but with the maximum CPU flags enabled (for performance). Open haohetao opened this issue Mar 8, 2024 · 0 comments Open QEMU/KVM cannot detect CPU flags on ARM (aarch64) #56. for machine types 4. Host My laptop support hardware virtualization & enabled in bios & i am trying to compile qemu from source. And taking advantage of the said two new libvirt APIs will also allow computing a more accurate baseline guest CPU that permits live migration across several To ensure a consistent default CPU across all machines, removing reliance of variable QEMU defaults. than qemu code, checking host cpu flags and guest cpus flags (and maybe some other tricky things). What QEMU calls "arm1136-r2" is actually the 1136 r0p2, i. Host type does not matter (unless you plan on using cpu flags etc) Bios is already set for the application => if you select Linux in the VM Creation it uses a different bios than if you select Windows. org> () In-Reply-To: Development work for qemu. If KunPeng 920 ARM syslog err[QEMU/KVM cannot detect CPU flags on ARM] #13. -display curses - Displays video Every hypervisor has its own policy for which CPU features the guest will see by default. pup sufpvm hycwldo zxprj abgh dzjyacdm pvub hlbmd jjkd sisun