This issue is still present today, on 5.4.0-153.170 Seems like the resolution is stalled. What can be done to get a fix out?
-- 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/1950706 Title: VMs running under qemu+kvm can't use xsaves processor feature Status in linux package in Ubuntu: Confirmed Status in qemu package in Ubuntu: Invalid Bug description: Virtual machines running under qemu using KVM acceleration run with `-cpu host` can't use the xsaves feature of the processor. An example guest dmesg log is attached, see errors about "unchecked MSR access error". Using a `-cpu` model that doesn't advertise xsaves such as `EPYC` fixes the problem on the guest. The host cpu does support xsaves and Ubuntu doesn't seem to have any issues with it. The guest dmesg provided is running linux mainline 5.15, but the issue happens with every kernel version I've tried, including centos on 4.18.0. The host cpu is a Ryzen 5 3600 nested guests have trouble running in a guest with `-cpu host` or even `-cpu EPYC`. They tend to run, but freeze before they finish booting at random times. Not sure if it's related. Nested guests do seem to be able to run with `-cpu kvm64`. There are no dmesg errors when a nested guest freezes. The Ubuntu host version: Description: Ubuntu 20.04.3 LTS Release: 20.04 # apt-cache policy qemu-system-x86 qemu-system-x86: Installed: 1:4.2-3ubuntu6.18 Candidate: 1:4.2-3ubuntu6.18 Version table: *** 1:4.2-3ubuntu6.18 500 500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 100 /var/lib/dpkg/status 1:4.2-3ubuntu6.17 500 500 http://us.archive.ubuntu.com/ubuntu focal-security/main amd64 Packages 1:4.2-3ubuntu6 500 500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: qemu (not installed) ProcVersionSignature: Ubuntu 5.4.0-89.100-generic 5.4.143 Uname: Linux 5.4.0-89-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 CasperMD5CheckResult: pass Date: Fri Nov 12 00:19:10 2021 InstallationDate: Installed on 2021-10-20 (22 days ago) InstallationMedia: Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20210824) MachineType: System manufacturer System Product Name ProcEnviron: SHELL=/bin/bash LANG=en_US.UTF-8 TERM=screen-256color XDG_RUNTIME_DIR=<set> PATH=(custom, no user) ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-89-generic root=UUID=15509878-abfa-45b1-b8c2-c99db1ececf7 ro SourcePackage: qemu UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/15/2021 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 4002 dmi.board.asset.tag: Default string dmi.board.name: PRIME X570-P dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4002:bd06/15/2021:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEX570-P:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1950706/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
