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Diffstat (limited to 'docs/hyperv.txt')
| -rw-r--r-- | docs/hyperv.txt | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/docs/hyperv.txt b/docs/hyperv.txt index e53c581f45..000638a2fd 100644 --- a/docs/hyperv.txt +++ b/docs/hyperv.txt @@ -170,7 +170,7 @@ Recommended: hv-frequencies 3.16. hv-evmcs =============== The enlightenment is nested specific, it targets Hyper-V on KVM guests. When -enabled, it provides Enlightened VMCS feature to the guest. The feature +enabled, it provides Enlightened VMCS version 1 feature to the guest. The feature implements paravirtualized protocol between L0 (KVM) and L1 (Hyper-V) hypervisors making L2 exits to the hypervisor faster. The feature is Intel-only. Note: some virtualization features (e.g. Posted Interrupts) are disabled when @@ -209,8 +209,11 @@ In some cases (e.g. during development) it may make sense to use QEMU in 'pass-through' mode and give Windows guests all enlightenments currently supported by KVM. This pass-through mode is enabled by "hv-passthrough" CPU flag. -Note: enabling this flag effectively prevents migration as supported features -may differ between target and destination. +Note: "hv-passthrough" flag only enables enlightenments which are known to QEMU +(have corresponding "hv-*" flag) and copies "hv-spinlocks="/"hv-vendor-id=" +values from KVM to QEMU. "hv-passthrough" overrides all other "hv-*" settings on +the command line. Also, enabling this flag effectively prevents migration as the +list of enabled enlightenments may differ between target and destination hosts. 4. Useful links |