[Qemu-commits] [qemu/qemu] 4467c6: hyperv: cpu hotplug fix with HyperV enabled

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: 4467c6c118b85133846785f517e5733112e811b4
      
https://github.com/qemu/qemu/commit/4467c6c118b85133846785f517e5733112e811b4
  Author: Denis V. Lunev <address@hidden>
  Date:   2016-03-14 (Mon, 14 Mar 2016)

  Changed paths:
    M target-i386/kvm.c

  Log Message:
  -----------
  hyperv: cpu hotplug fix with HyperV enabled

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.

The bit should be set when CPU hotplug is allowed for HyperV VM.
The check that hot_add_cpu callback is defined is enough from the
protocol point of view. Though this callback is defined almost
always thus there is no need to export that knowledge in the
other way.

Signed-off-by: Denis V. Lunev <address@hidden>
Reviewed-by: Roman Kagan <address@hidden>
CC: Paolo Bonzini <address@hidden>
CC: Richard Henderson <address@hidden>
CC: Eduardo Habkost <address@hidden>
CC: "Andreas Färber" <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>


  Commit: 492a4c94be8853aa378a5dd8a1f8e3181754aabd
      
https://github.com/qemu/qemu/commit/492a4c94be8853aa378a5dd8a1f8e3181754aabd
  Author: Lan Tianyu <address@hidden>
  Date:   2016-03-14 (Mon, 14 Mar 2016)

  Changed paths:
    M target-i386/cpu.c

  Log Message:
  -----------
  kvm: Remove x2apic feature from CPU model when kernel_irqchip is off

x2apic feature is in the kvm_default_props and automatically added to all
CPU models when KVM is enabled. But userspace devices don't support x2apic
which can't be enabled without the in-kernel irqchip. It will trigger
warning of "host doesn't support requested feature: CPUID.01H:ECX.x2apic
[bit 21]" when kernel_irqchip is off. This patch is to fix it via removing
x2apic feature when kernel_irqchip is off.

Signed-off-by: Lan Tianyu <address@hidden>
Acked-by: Paolo Bonzini <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
Signed-off-by: Eduardo Habkost <address@hidden>


  Commit: d41e0bed7ba7bad87b4e0cedf5580f29ee1a311f
      
https://github.com/qemu/qemu/commit/d41e0bed7ba7bad87b4e0cedf5580f29ee1a311f
  Author: Peter Maydell <address@hidden>
  Date:   2016-03-15 (Tue, 15 Mar 2016)

  Changed paths:
    M target-i386/cpu.c
    M target-i386/kvm.c

  Log Message:
  -----------
  Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into 
staging

X86 fixes

# gpg: Signature made Mon 14 Mar 2016 20:26:25 GMT using RSA key ID 984DC5A6
# gpg: Good signature from "Eduardo Habkost <address@hidden>"

* remotes/ehabkost/tags/x86-pull-request:
  kvm: Remove x2apic feature from CPU model when kernel_irqchip is off
  hyperv: cpu hotplug fix with HyperV enabled

Signed-off-by: Peter Maydell <address@hidden>


Compare: https://github.com/qemu/qemu/compare/9828f9b6c840...d41e0bed7ba7