Previous versions pointed out the problem of wbinvd_on_all_cpus() in SEV and tried to maintain a cpumask to solve it. This version futher removes unnecessary calls to wbinvd(). Although dirty_mask is not maintained perfectly and may lead to wbinvd on physical CPUs that are not running a SEV guest, it's still better than wbinvd_on_all_cpus(). And vcpu migration is designed to be solved in future work. --- v4 -> v5: - Added a commit to remove unnecessary calls to wbinvd(). v3 -> v4: - Added a wbinvd helper and export it to SEV. - Changed the struct cpumask in kvm_sev_info into cpumask*, which should be dynamically allocated and freed. - Changed the time of recording the CPUs from pre_sev_run() to vcpu_load(). - Removed code of clearing the mask. v2 -> v3: - Replaced get_cpu() with parameter cpu in pre_sev_run(). v1 -> v2: - Added sev_do_wbinvd() to wrap two operations. - Used cpumask_test_and_clear_cpu() to avoid concurrent problems. --- Zheyun Shen (3): KVM: x86: Add a wbinvd helper KVM: SVM: Remove wbinvd in sev_vm_destroy() KVM: SVM: Flush cache only on CPUs running SEV guest arch/x86/kvm/svm/sev.c | 45 +++++++++++++++++++++++++++++++++--------- arch/x86/kvm/svm/svm.c | 2 ++ arch/x86/kvm/svm/svm.h | 5 ++++- arch/x86/kvm/x86.c | 9 +++++++-- arch/x86/kvm/x86.h | 1 + 5 files changed, 50 insertions(+), 12 deletions(-) -- 2.34.1
