diff options
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index b87fa32835f2..5d8db4922df6 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -688,9 +688,14 @@ MSRs that have been set successfully. Defines the vcpu responses to the cpuid instruction. Applications should use the KVM_SET_CPUID2 ioctl if available. -Note, when this IOCTL fails, KVM gives no guarantees that previous valid CPUID -configuration (if there is) is not corrupted. Userspace can get a copy of the -resulting CPUID configuration through KVM_GET_CPUID2 in case. +Caveat emptor: + - If this IOCTL fails, KVM gives no guarantees that previous valid CPUID + configuration (if there is) is not corrupted. Userspace can get a copy + of the resulting CPUID configuration through KVM_GET_CPUID2 in case. + - Using KVM_SET_CPUID{,2} after KVM_RUN, i.e. changing the guest vCPU model + after running the guest, may cause guest instability. + - Using heterogeneous CPUID configurations, modulo APIC IDs, topology, etc... + may cause guest instability. :: |