Re: [Qemu-devel] [PATCH] pc: fix KVM features in pc-1.3 and earlier machine types

["Andreas Färber" <afaerber@suse.de>]

Am 19.01.2015 um 12:24 schrieb Paolo Bonzini:
> Due to a typo, instead of disabling KVM_FEATURE_PV_EOI (bit
> 6) these machine types are disabling bits 1 and 2, which are
> KVM_FEATURE_NOP_IO_DELAY and KVM_FEATURE_MMU_OP.  Not a big deal
> because they aren't very important and KVM_FEATURE_MMU_OP is
> disabled anyway.  The worst part is actually that KVM_FEATURE_PV_EOI
> is remaining enabled.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  hw/i386/pc_piix.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index f0a3201..97a754e 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -406,7 +406,7 @@ static void pc_compat_1_3(MachineState *machine)
>  static void pc_compat_1_2(MachineState *machine)
>  {
>      pc_compat_1_3(machine);
> -    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, KVM_FEATURE_PV_EOI);
> +    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, 1 << KVM_FEATURE_PV_EOI);
>  }
>  
>  static void pc_init_pci_2_2(MachineState *machine)
> @@ -483,7 +483,7 @@ static void pc_init_isa(MachineState *machine)
>      if (!machine->cpu_model) {
>          machine->cpu_model = "486";
>      }
> -    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, KVM_FEATURE_PV_EOI);
> +    x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, 1 << KVM_FEATURE_PV_EOI);
>      enable_compat_apic_id_mode();
>      pc_init1(machine, 0, 1);
>  }

Might it make sense to tweak that helper function instead to avoid this
reoccurring? Either way, no objection, please apply through kvm queue.

Regards,
Andreas

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