This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- artful' to 'verification-done-artful'. If the problem still exists, change the tag 'verification-needed-artful' to 'verification-failed- artful'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-artful -- 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/1724912 Title: TSC_DEADLINE incorrectly disabled inside virtual guests Status in linux package in Ubuntu: In Progress Status in linux source package in Artful: Fix Committed Status in linux source package in Bionic: Fix Released Bug description: An upstream commit added Intel cpu model/microcode checks to disable TSC_DEADLINE due to cpu errata: commit bd9240a18edfbfa72e957fc2ba831cf1f13ea073 Author: Peter Zijlstra <pet...@infradead.org> Date: Wed May 31 17:52:03 2017 +0200 x86/apic: Add TSC_DEADLINE quirk due to errata That commit is included in the Ubuntu kernels starting at artful v4.13. However, most hypervisors virtualize TSC deadline timer (and therefore it isn't affected by Intel CPU errata inside the guest), and even if any hypervisors directly exposed the hardware TSC deadline timer, the guests cannot update CPU microcode and therefore it's the hypervisor's job to disable/hide/virtualize the TSC deadline timer from the guest. This upstream commit skips the microcode check to disable the TSC deadline timer if it detects it's running under a hypervisor: commit cc6afe2240298049585e86b1ade85efc8a7f225d Author: Paolo Bonzini <pbonz...@redhat.com> Date: Tue Oct 10 12:12:57 2017 +0200 x86/apic: Silence "FW_BUG TSC_DEADLINE disabled due to Errata" on hypervisors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1724912/+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
