On Thu, Oct 31, 2024, Sean Christopherson wrote: > On Wed, 09 Oct 2024 10:49:58 -0700, Sean Christopherson wrote: > > Fix a (VMX only) bug reported by Maxim where KVM caches a stale SS.AR_BYTES > > when involuntary preemption schedules out a vCPU during vmx_vcpu_rest(), and > > ultimately clobbers the VMCS's SS.AR_BYTES if userspace does KVM_GET_SREGS > > => KVM_SET_SREGS, i.e. if userspace writes the stale value back into KVM. > > > > v4, as this is a spiritual successor to Maxim's earlier series. > > > > [...] > > Applied 1 and 3-4 to kvm-x86 misc. Patch 2 went into 6.12. Thanks! > > [1/4] KVM: x86: Bypass register cache when querying CPL from kvm_sched_out() > https://github.com/kvm-x86/linux/commit/8c8e90f79c56 > [2/4] KVM: VMX: reset the segment cache after segment init in vmx_vcpu_reset() > (no commit info) > [3/4] KVM: x86: Add lockdep-guarded asserts on register cache usage > https://github.com/kvm-x86/linux/commit/21abefc6958d > [4/4] KVM: x86: Use '0' for guest RIP if PMI encounters protected guest state > https://github.com/kvm-x86/linux/commit/a395d143ef40 FYI, I rebased misc to v6.12-rc5, as patches in another series had already been taken through the tip tree. New hashes: [1/4] KVM: x86: Bypass register cache when querying CPL from kvm_sched_out() https://github.com/kvm-x86/linux/commit/f0e7012c4b93 ... [3/4] KVM: x86: Add lockdep-guarded asserts on register cache usage https://github.com/kvm-x86/linux/commit/1c932fc7620d [4/4] KVM: x86: Use '0' for guest RIP if PMI encounters protected guest state https://github.com/kvm-x86/linux/commit/eecf3985459a
