On 08/02/2018 10:44, Wanpeng Li wrote:
> From: Wanpeng Li <wanpengli@xxxxxxxxxxx>
>
> Add PV_DEDICATED hint cpuid feature bit.
Please add a new feature word, since this is not a PV feature but more
like a performance hint.
Thanks,
Paolo
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx>
> Cc: Eduardo Habkost <ehabkost@xxxxxxxxxx>
> Signed-off-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>
> ---
> target/i386/cpu.c | 4 ++++
> target/i386/cpu.h | 3 +++
> 2 files changed, 7 insertions(+)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index d70954b..cf48931 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -4076,6 +4076,9 @@ static int x86_cpu_filter_features(X86CPU *cpu)
> x86_cpu_get_supported_feature_word(w, false);
> uint32_t requested_features = env->features[w];
> env->features[w] &= host_feat;
> + if (cpu->pv_dedicated && (w == FEAT_KVM)) {
> + env->features[w] |= CPUID_PV_DEDICATED;
> + }
> cpu->filtered_features[w] = requested_features & ~env->features[w];
> if (cpu->filtered_features[w]) {
> rv = 1;
> @@ -4682,6 +4685,7 @@ static Property x86_cpu_properties[] = {
> false),
> DEFINE_PROP_BOOL("vmware-cpuid-freq", X86CPU, vmware_cpuid_freq, true),
> DEFINE_PROP_BOOL("tcg-cpuid", X86CPU, expose_tcg, true),
> + DEFINE_PROP_BOOL("pv-dedicated", X86CPU, pv_dedicated, false),
>
> /*
> * From "Requirements for Implementing the Microsoft
> diff --git a/target/i386/cpu.h b/target/i386/cpu.h
> index f91e37d..8000da5 100644
> --- a/target/i386/cpu.h
> +++ b/target/i386/cpu.h
> @@ -672,6 +672,8 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
>
> #define CPUID_8000_0008_EBX_IBPB (1U << 12) /* Indirect Branch Prediction Barrier */
>
> +#define CPUID_PV_DEDICATED (1U << 8)
> +
> #define CPUID_XSAVE_XSAVEOPT (1U << 0)
> #define CPUID_XSAVE_XSAVEC (1U << 1)
> #define CPUID_XSAVE_XGETBV1 (1U << 2)
> @@ -1276,6 +1278,7 @@ struct X86CPU {
> bool expose_kvm;
> bool expose_tcg;
> bool migratable;
> + bool pv_dedicated;
> bool max_features; /* Enable all supported features automatically */
> uint32_t apic_id;
>
>
