On Thu, Oct 31, 2024, Sean Christopherson wrote: > On Fri, 02 Aug 2024 11:55:02 -0700, Sean Christopherson wrote: > > The primary goal of this series to fix an issue where KVM's initialization > > of feature MSRs during vCPU creation results in a failed save/restore of > > PERF_CAPABILITIES. If userspace configures the VM to _not_ have a PMU, > > because KVM initializes the vCPU's PERF_CAPABILTIIES, trying to save/restore > > the non-zero value will be rejected by the destination. > > > > The secondary goal is to try and avoid such goofs in the future, by making > > it explicitly clear that userspace owns the vCPU model. > > > > [...] > > Applied to kvm-x86 misc, thanks! > > [1/9] KVM: x86: Co-locate initialization of feature MSRs in kvm_arch_vcpu_create() > https://github.com/kvm-x86/linux/commit/383383cfd202 > [2/9] KVM: x86: Disallow changing MSR_PLATFORM_INFO after vCPU has run > https://github.com/kvm-x86/linux/commit/d76a5e78f16d > [3/9] KVM: x86: Quirk initialization of feature MSRs to KVM's max configuration > https://github.com/kvm-x86/linux/commit/088b8eeb25ec > [4/9] KVM: x86: Reject userspace attempts to access PERF_CAPABILITIES w/o PDCM > https://github.com/kvm-x86/linux/commit/c2eb2d0318c0 > [5/9] KVM: VMX: Remove restriction that PMU version > 0 for PERF_CAPABILITIES > https://github.com/kvm-x86/linux/commit/bae593b20e92 > [6/9] KVM: x86: Reject userspace attempts to access ARCH_CAPABILITIES w/o support > https://github.com/kvm-x86/linux/commit/83a5fe6cf1eb > [7/9] KVM: x86: Remove ordering check b/w MSR_PLATFORM_INFO and MISC_FEATURES_ENABLES > https://github.com/kvm-x86/linux/commit/9d2dcfb82db1 > [8/9] KVM: selftests: Verify get/set PERF_CAPABILITIES w/o guest PDMC behavior > https://github.com/kvm-x86/linux/commit/6a4511f8602f > [9/9] KVM: selftests: Add a testcase for disabling feature MSRs init quirk > https://github.com/kvm-x86/linux/commit/58a7368f104d FYI, I rebased misc to v6.12-rc5, as patches in another series had already been taken through the tip tree. New hashes: [1/9] KVM: x86: Co-locate initialization of feature MSRs in kvm_arch_vcpu_create() https://github.com/kvm-x86/linux/commit/2142ac663a6a [2/9] KVM: x86: Disallow changing MSR_PLATFORM_INFO after vCPU has run https://github.com/kvm-x86/linux/commit/bc2ca3680b30 [3/9] KVM: x86: Quirk initialization of feature MSRs to KVM's max configuration https://github.com/kvm-x86/linux/commit/dcb988cdac85 [4/9] KVM: x86: Reject userspace attempts to access PERF_CAPABILITIES w/o PDCM https://github.com/kvm-x86/linux/commit/d75cac366f44 [5/9] KVM: VMX: Remove restriction that PMU version > 0 for PERF_CAPABILITIES https://github.com/kvm-x86/linux/commit/a1039111192b [6/9] KVM: x86: Reject userspace attempts to access ARCH_CAPABILITIES w/o support https://github.com/kvm-x86/linux/commit/a5d563890b8f [7/9] KVM: x86: Remove ordering check b/w MSR_PLATFORM_INFO and MISC_FEATURES_ENABLES https://github.com/kvm-x86/linux/commit/1ded7a57b805 [8/9] KVM: selftests: Verify get/set PERF_CAPABILITIES w/o guest PDMC behavior https://github.com/kvm-x86/linux/commit/b799e3e7da2c [9/9] KVM: selftests: Add a testcase for disabling feature MSRs init quirk https://github.com/kvm-x86/linux/commit/0581dfbad954
