Sent out to kernel team: https://lists.ubuntu.com/archives/kernel-team/2019-August/103470.html https://lists.ubuntu.com/archives/kernel-team/2019-August/103471.html
** Description changed: [Impact] - * QEMU does not work in some AMD hardware when using host-passthrough as cpu-mode (usually to allow nested KVM to work). - * QEMU does not start, hanging before the VM initialization. + * Nested AMD KVM guest does not work in AMD CPUs when using host-passthrough as cpu-mode. + * QEMU does not start, hanging before the VM initialization. [Test Case] - * to use Xenial qemu on top of a regular Xenial kernel -> doesn't work (intermittent) - * to use the following XML file: https://paste.ubuntu.com/p/BSyFY7ksR5/ - * to have AMD FX(tm)-8350 Eight-Core Processor CPU or similar - * to use Xenial qemu on top of a HWE kernel -> works + * Bionic KVM GUEST tries to use nested KVM in AMD CPU + * to use the following XML file: https://paste.ubuntu.com/p/BSyFY7ksR5/ + * to have AMD FX(tm)-8350 Eight-Core Processor CPU or similar + * to use Xenial qemu on top of a HWE kernel -> works [Regression Potential] - * TODO + * KVM SVM could be affected but patch is from upstream, fixes the + specific issue and has been tested by me in my currently developing + workstation (heavy usage). [Other Info] - * TODO + * Patches have been sent to kernel team mailing list. -- 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/1834522 Title: Bionic QEMU with Bionic Kernel hangs in AMD FX-8350 with cpu-host as passthrough Status in linux package in Ubuntu: Fix Released Status in linux source package in Bionic: In Progress Bug description: [Impact] * Nested AMD KVM guest does not work in AMD CPUs when using host-passthrough as cpu-mode. * QEMU does not start, hanging before the VM initialization. [Test Case] * Bionic KVM GUEST tries to use nested KVM in AMD CPU * to use the following XML file: https://paste.ubuntu.com/p/BSyFY7ksR5/ * to have AMD FX(tm)-8350 Eight-Core Processor CPU or similar * to use Xenial qemu on top of a HWE kernel -> works [Regression Potential] * KVM SVM could be affected but patch is from upstream, fixes the specific issue and has been tested by me in my currently developing workstation (heavy usage). [Other Info] * Patches have been sent to kernel team mailing list. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834522/+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
