https://bugzilla.kernel.org/show_bug.cgi?id=206579 --- Comment #26 from Suravee Suthikulpanit (suravee.suthikulpanit@xxxxxxx) --- There are several reason that could inhibit the AVIC from being activated even though it is enabled during module load (i.e. modprobe kvm_amd avic=1). Could you please try the following patch: ---- BEGIN PATCH ---- diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 40a0c0f..fb7e5a6 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -995,6 +995,7 @@ struct kvm_vm_stat { ulong lpages; ulong nx_lpage_splits; ulong max_mmu_page_hash_collisions; + ulong apicv_inhibit_reasons; }; struct kvm_vcpu_stat { diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index fb5d64e..2c968a7 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -222,6 +222,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { { "nx_largepages_splitted", VM_STAT(nx_lpage_splits, .mode = 0444) }, { "max_mmu_page_hash_collisions", VM_STAT(max_mmu_page_hash_collisions) }, + { "apicv_inhibit_reasons", VM_STAT(apicv_inhibit_reasons, .mode = 0444) }, { NULL } }; @@ -8051,6 +8052,7 @@ void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit) return; } + kvm->stat.apicv_inhibit_reasons = kvm->arch.apicv_inhibit_reasons; trace_kvm_apicv_update_request(activate, bit); if (kvm_x86_ops->pre_update_apicv_exec_ctrl) kvm_x86_ops->pre_update_apicv_exec_ctrl(kvm, activate); ---- END PATCH ---- Then, while running the VM, please run "cat /sys/kernel/debug/kvm/*/apicv_inhibit_reasons". This should allow us to see why KVM deactivate AVIC. Trying your XML file in the description, I also noticed that AVIC is deactivated for the VM. However, when I tries specifying EPYC-IBPB model in the XML, then it creates the VM w/ AVIC activated. Could you please give it a try? Thanks, Suravee -- You are receiving this mail because: You are watching the assignee of the bug.
