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

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Date:   Thu, 11 Mar 2021 16:15:37 -0600
From:   Babu Moger <babu.moger@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        kvm list <kvm@...r.kernel.org>, Joerg Roedel <joro@...tes.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Makarand Sonare <makarandsonare@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH v6 00/12] SVM cleanup and INVPCID feature support



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
>