> -----Original Message----- > From: Jim Mattson <jmattson@xxxxxxxxxx> > Sent: Tuesday, February 23, 2021 6:14 PM > To: Moger, Babu <Babu.Moger@xxxxxxx> > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>; Vitaly Kuznetsov > <vkuznets@xxxxxxxxxx>; Wanpeng Li <wanpengli@xxxxxxxxxxx>; kvm list > <kvm@xxxxxxxxxxxxxxx>; Joerg Roedel <joro@xxxxxxxxxx>; the arch/x86 > maintainers <x86@xxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx>; Ingo > Molnar <mingo@xxxxxxxxxx>; Borislav Petkov <bp@xxxxxxxxx>; H . Peter Anvin > <hpa@xxxxxxxxx>; Thomas Gleixner <tglx@xxxxxxxxxxxxx>; Makarand Sonare > <makarandsonare@xxxxxxxxxx>; Sean Christopherson <seanjc@xxxxxxxxxx> > Subject: Re: [PATCH v6 00/12] SVM cleanup and INVPCID feature support > > Any updates? What should we be telling customers with Debian 9 guests? :-) Found another problem with pcid feature om SVM. It is do with CR4 flags reset during bootup. Problem was showing up with kexec loading on VM. I am not sure if this is related to that. Will send the patch soon. > > On Fri, Jan 22, 2021 at 5:52 PM Babu Moger <babu.moger@xxxxxxx> wrote: > > > > > > > > On 1/21/21 5:51 PM, Babu Moger wrote: > > > > > > > > > On 1/20/21 9:10 PM, Babu Moger wrote: > > >> > > >> > > >> On 1/20/21 3:45 PM, Babu Moger wrote: > > >>> > > >>> > > >>> On 1/20/21 3:14 PM, Jim Mattson wrote: > > >>>> On Tue, Jan 19, 2021 at 3:45 PM Babu Moger <babu.moger@xxxxxxx> > wrote: > > >>>>> > > >>>>> > > >>>>> > > >>>>> On 1/19/21 5:01 PM, Jim Mattson wrote: > > >>>>>> On Mon, Sep 14, 2020 at 11:33 AM Babu Moger > <babu.moger@xxxxxxx> wrote: > > >>>>>> > > >>>>>>> Thanks Paolo. Tested Guest/nested guest/kvm units tests. > > >>>>>>> Everything works as expected. > > >>>>>> > > >>>>>> Debian 9 does not like this patch set. As a kvm guest, it > > >>>>>> panics on a Milan CPU unless booted with 'nopcid'. Gmail > > >>>>>> mangles long lines, so please see the attached kernel log > > >>>>>> snippet. Debian 10 is fine, so I assume this is a guest bug. > > >>>>>> > > >>>>> > > >>>>> We had an issue with PCID feature earlier. This was showing only > > >>>>> with SEV guests. It is resolved recently. Do you think it is not related > that? > > >>>>> Here are the patch set. > > >>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F% > > >>>>> > 2Flore.kernel.org%2Fkvm%2F160521930597.32054.4906933314022910996 > > >>>>> .stgit%40bmoger- > ubuntu%2F&data=04%7C01%7Cbabu.moger%40amd.co > > >>>>> > m%7C9558672ca21c4f6c2d5308d8d85919dc%7C3dd8961fe4884e608e11a82d9 > > >>>>> > 94e183d%7C0%7C0%7C637497224490455772%7CUnknown%7CTWFpbGZsb3d8 > eyJ > > >>>>> > WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D% > > >>>>> > 7C1000&sdata=4QzTNHaYllwPd1U0kumq75dpwp7Rg0ZXsSQ631jMeqs%3D > & > > >>>>> amp;reserved=0 > > >>>> > > >>>> The Debian 9 release we tested is not an SEV guest. > > >>> ok. I have not tested Debian 9 before. I will try now. Will let > > >>> you know how it goes. thanks > > >>> > > >> > > >> I have reproduced the issue locally. Will investigate. thanks > > >> > > > Few updates. > > > 1. Like Jim mentioned earlier, this appears to be guest kernel issue. > > > Debian 9 runs the base kernel 4.9.0-14. Problem can be seen > > > consistently with this kernel. > > > > > > 2. This guest kernel(4.9.0-14) does not like the new feature INVPCID. > > > > > > 3. System comes up fine when invpcid feature is disabled with the > > > boot parameter "noinvpcid" and also with "nopcid". nopcid disables > > > both pcid and invpcid. > > > > > > 4. Upgraded the guest kernel to v5.0 and system comes up fine. > > > > > > 5. Also system comes up fine with latest guest kernel 5.11.0-rc4. > > > > > > I did not bisect further yet. > > > Babu > > > Thanks > > > > > > Some more update: > > System comes up fine with kernel v4.9(checked out on upstream tag v4.9). > > So, I am assuming this is something specific to Debian 4.9.0-14 kernel. > > > > Note: I couldn't go back prior versions(v4.8 or earlier) due to > > compile issues. > > Thanks > > Babu > >
