On 3/11/21 3:40 PM, Borislav Petkov wrote: > On Thu, Mar 11, 2021 at 02:57:04PM -0600, Babu Moger wrote: >> It is related PCID and INVPCID combination. Few more details. >> 1. System comes up fine with "noinvpid". So, it happens when invpcid is >> enabled. > > Which system, host or guest? > >> 2. Host is coming up fine. Problem is with the guest. > > Aha, guest. > >> 3. Problem happens with Debian 9. Debian kernel version is 4.9.0-14. >> 4. Debian 10 is fine. >> 5. Upstream kernels are fine. Tried on v5.11 and it is working fine. >> 6. Git bisect pointed to commit 47811c66356d875e76a6ca637a9d384779a659bb. >> >> Let me know if want me to try something else. > > Yes, I assume host has the patches which belong to this thread? Yes. Host has all these patches. Right now I am on 5.12.0-rc2. I just updated yesterday. I was able to reproduce 5.11 also. > > So please describe: > > 1. host has these patches, cmdline params, etc. # cat /proc/cmdline BOOT_IMAGE=(hd0,gpt2)/vmlinuz-5.12.0-rc2+ root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap ras=cec_disable nmi_watchdog=0 warn_ud2=on selinux=0 earlyprintk=serial,ttyS1,115200n8 console=ttyS1,115200n8 > 2. guest is a 4.9 kernel, cmdline params, etc. I use qemu command line to bring up the guest. Make sure to use "-cpu host". qemu-system-x86_64 -name deb9 -m 16384 -smp cores=16,threads=1,sockets=1 -hda vdisk-deb.qcow2 -enable-kvm -net nic -net bridge,br=virbr0,helper=/usr/libexec/qemu-bridge-helper -cpu host,+svm -nographic The grub command line looks like this on the guest. cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-4.9.0-14-amd64 root=UUID=a0069240-cd60-4795-a391-273266dbae29 ro console=ttyS0,112500n8 earlyprintk
