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    target-ppc: Create versionless CPU class per family if KVM · 5b79b1ca
    Alexey Kardashevskiy 提交于
    At the moment generic version-less CPUs are supported via hardcoded aliases.
    For example, POWER7 is an alias for POWER7_v2.1. So when QEMU is started
    with -cpu POWER7, the POWER7_v2.1 class instance is created.
    
    This approach works for TCG and KVMs other than HV KVM. HV KVM cannot emulate
    PVR value so the guest always sees the real PVR. HV KVM will not allow setting
    PVR other that the host PVR because of that (the kernel patch for it is on
    its way). So in most cases it is impossible to run QEMU with -cpu POWER7
    unless the host PVR is exactly the same as the one from the alias (which
    is now POWER7_v2.3). It was decided that under HV KVM QEMU should use
    -cpu host.
    
    Using "host" CPU type creates a problem for management tools such as libvirt
    because they want to know in advance if the destination guest can possibly
    run on the destination. Since the "host" type is really not a type and will
    always work with any KVM, there is no way for libvirt to know if the migration
    will success.
    
    This registers additional CPU class derived from the host CPU family.
    The name for it is taken from @desc field of the CPU family class.
    Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
    Signed-off-by: NAlexander Graf <agraf@suse.de>
    5b79b1ca
kvm.c 53.8 KB