Re: [PATCH v6 00/12] SVM cleanup and INVPCID feature support

Babu Moger
2021-03-11T22:16:45Z

On 3/11/21 4:04 PM, Babu Moger wrote:
>
>
> 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.

My host is
# cat /etc/redhat-release
Red Hat Enterprise Linux release 8.3 (Ootpa)
# uname -r
5.12.0-rc2+

>
> # 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
>