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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2019-05-17 16:19:20 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-06-21 02:29:38 +0200 |
| commit | e48ddcc6ce13323087133f5922f8eb2fe516817b (patch) | |
| tree | 95ec7889bab11bbfba0aefef2cebed488b814bdb /docs/hyperv.txt | |
| parent | fb19f72b774ce47cd26955ad61547bc3f7f02626 (diff) | |
| download | qemu-e48ddcc6ce13323087133f5922f8eb2fe516817b.zip qemu-e48ddcc6ce13323087133f5922f8eb2fe516817b.tar.gz qemu-e48ddcc6ce13323087133f5922f8eb2fe516817b.tar.bz2 | |
i386/kvm: implement 'hv-passthrough' mode
In many case we just want to give Windows guests all currently supported
Hyper-V enlightenments and that's where this new mode may come handy. We
pass through what was returned by KVM_GET_SUPPORTED_HV_CPUID.
hv_cpuid_check_and_set() is modified to also set cpu->hyperv_* flags as
we may want to check them later (and we actually do for hv_runtime,
hv_synic,...).
'hv-passthrough' is a development only feature, a migration blocker is
added to prevent issues while migrating between hosts with different
feature sets.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20190517141924.19024-6-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'docs/hyperv.txt')
| -rw-r--r-- | docs/hyperv.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/hyperv.txt b/docs/hyperv.txt index c423e0f..beadb2d 100644 --- a/docs/hyperv.txt +++ b/docs/hyperv.txt @@ -175,6 +175,16 @@ without the feature to find out if enabling it is beneficial. Requires: hv-vapic +4. Development features +======================== +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. + + 4. Useful links ================ Hyper-V Top Level Functional specification and other information: |