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i386/kvm: implement 'hv-passthrough' mode

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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>
This commit is contained in:
Vitaly Kuznetsov 2019-05-17 16:19:20 +02:00 • committed by Paolo Bonzini
parent fb19f72b77
commit e48ddcc6ce
4 changed files with 87 additions and 14 deletions
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10
docs/hyperv.txt
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@ -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: