>-----Original Message----- >From: Paolo Bonzini <paolo.bonz...@gmail.com> On Behalf Of Paolo Bonzini >Sent: Wednesday, July 20, 2022 2:19 AM >To: Christopherson,, Sean <sea...@google.com> >Cc: Duan, Zhenzhong <zhenzhong.d...@intel.com>; qemu- >de...@nongnu.org; mtosa...@redhat.com; lik...@tencent.com; Ma, >XiangfeiX <xiangfeix...@intel.com> >Subject: Re: [PATCH] i386: Disable BTS and PEBS > >On 7/18/22 22:12, Sean Christopherson wrote: >> On Mon, Jul 18, 2022, Paolo Bonzini wrote: >>> This needs to be fixed in the kernel because old QEMU/new KVM is >supported. >> >> I can't object to adding a quirk for this since KVM is breaking >> userspace, but on the KVM side we really need to stop "sanitizing" >> userspace inputs unless it puts the host at risk, because inevitably it leads >to needing a quirk. > >The problem is not the sanitizing, it's that userspace literally cannot know >that this needs to be done because the feature bits are "backwards" >(1 = unavailable). > >The right way to fix it is probably to use feature MSRs and, by default, leave >the features marked as unavailable. I'll think it through and post a patch >tomorrow for both KVM and QEMU (to enable PEBS). Hi Paolo,
Can we ask the status of your patch? QA still reproduce with newest upstream code. Thanks Zhenzhong
