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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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1
target/i386/cpu.h
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@ -1390,6 +1390,7 @@ struct X86CPU {
char *hyperv_vendor_id;
bool hyperv_synic_kvm_only;
uint64_t hyperv_features;
bool hyperv_passthrough;
bool check_cpuid;
bool enforce_cpuid;