search for: ibrs_en

..., spectre or something else. > > I finally managed to install a fresh KVM host / guest pair on an identical blade ( HS21XM, 64 GB ram, 2*E5450@ 3.00GHz ). Here are the results I see: 1. KVM host, stock instalation and fully updated, kernel 3.10.0-1127.10.1 #cd /sys/kernel/debug/x86/ #cat ibrs_enabled pti_enabled retp_enabled 0 1 1 #time yum -y reinstall kernel-3.10.0-1127.el7.x86_64 real??? 0m50.026s user??? 0m32.872s sys???? 0m23.312s 2. KVM guest on the same machine (virt-install --name guest1-rhel7 --memory 2048 --vcpus 2? --disk size=20 --network=bridge:br0 --pxe --os-variant rhel...

..., speculative store bypass (ssbd), as well as MDS via MD_CLEAR mitigation. When I mount the debugfs, the flag for ibrs is missing - preventing me enabling it as a mitigation for ssbd (due to lack of relevant cpu flag): # mount -t debugfs none /sys/kernel/debug/ # ls -lahtr /sys/kernel/debug/x86/ibrs_enabled ls: cannot access /sys/kernel/debug/x86/ibrs_enabled: No such file or directory I have other R620's with the same CPUs running stock el6 kernels that are showing as fully patched to these issues. Could I please get some feedback from whoever builds out the kernels; if the mitigations/p...

Hello ??? For the past months I've been testing upgrading my Xen hosts to CentOS 7 and I face an issue for which I need your help to solve. ??? The testing machines are IBM blades, model H21 and H21XM. Initial tests were performed on the H21 with 16 GB RAM; during the last 6=7 weeks I've been using the H21XM with 64 GB. In all cases the guests were fully updated CentOS 7 --