Am 11.02.2016 um 21:19 schrieb Denis V. Lunev:
> From: "Alexey V. Kostyushko" <alek...@virtuozzo.com>
>
> With Hyper-V enabled CPU hotplug stops working. The CPU appears in device
> manager on Windows but does not appear in peformance monitor and control
> panel.
>
> The root of the problem is the following. Windows checks
> HV_X64_CPU_DYNAMIC_PARTITIONING_AVAILABLE bit in CPUID. The presence of
> this bit is enough to cure the situation.
>
> Add option 'hv-cpuhotplug' to control this behavior.
>
> Signed-off-by: Alexey V. Kostyushko <alek...@virtuozzo.com>
> Signed-off-by: Denis V. Lunev <d...@openvz.org>
> CC: Paolo Bonzini <pbonz...@redhat.com>
> CC: Richard Henderson <r...@twiddle.net>
> CC: Eduardo Habkost <ehabk...@redhat.com>
> CC: "Andreas Färber" <afaer...@suse.de>
> ---
> target-i386/cpu-qom.h | 1 +
> target-i386/cpu.c | 1 +
> target-i386/kvm.c | 6 +++++-
> 3 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
> index 5f9d960..4aec616 100644
> --- a/target-i386/cpu-qom.h
> +++ b/target-i386/cpu-qom.h
> @@ -96,6 +96,7 @@ typedef struct X86CPU {
> bool hyperv_runtime;
> bool hyperv_synic;
> bool hyperv_stimer;
> + bool hyperv_cpuhotplug;
> bool check_cpuid;
> bool enforce_cpuid;
> bool expose_kvm;
> diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> index b255644..32c38ae 100644
> --- a/target-i386/cpu.c
> +++ b/target-i386/cpu.c
> @@ -3172,6 +3172,7 @@ static Property x86_cpu_properties[] = {
> DEFINE_PROP_BOOL("hv-runtime", X86CPU, hyperv_runtime, false),
> DEFINE_PROP_BOOL("hv-synic", X86CPU, hyperv_synic, false),
> DEFINE_PROP_BOOL("hv-stimer", X86CPU, hyperv_stimer, false),
> + DEFINE_PROP_BOOL("hv-cpuhotplug", X86CPU, hyperv_cpuhotplug, false),
Is "cpuhotplug" some fixed HyperV name? Otherwise we generally use a
dashes convention for QOM properties, i.e. "hv-cpu-hotplug".
Regards,
Andreas
> DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, true),
> DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
> DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),
[snip]
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