Re: [Xen-devel] [PATCH] x86/hvm/viridian: save APIC assist vector

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 24/03/16 17:19, Paul Durrant wrote:
> @@ -293,10 +292,11 @@ void viridian_start_apic_assist(struct vcpu *v, int 
> vector)
>       * wrong and the VM will most likely hang so force a crash now
>       * to make the problem clear.
>       */
> -    if ( v->arch.hvm_vcpu.viridian.apic_assist.vector >= 0 )
> +    if ( v->arch.hvm_vcpu.viridian.apic_assist.vector != 0 )
>          domain_crash(v->domain);
>  
> -    v->arch.hvm_vcpu.viridian.apic_assist.vector = vector;
> +    /* Increment the value so that zero is always invalid. */
> +    v->arch.hvm_vcpu.viridian.apic_assist.vector = vector + 1;

Can you add a comment to viridan_cpu that a variable named vector
actually holds "vector + 1" ?

It can also be changed to an unsigned value.

>      *va |= 1u;
>  }
>  
> diff --git a/xen/include/public/arch-x86/hvm/save.h 
> b/xen/include/public/arch-x86/hvm/save.h
> index fbd1c6a..fc8e8f9 100644
> --- a/xen/include/public/arch-x86/hvm/save.h
> +++ b/xen/include/public/arch-x86/hvm/save.h
> @@ -588,7 +588,8 @@ struct hvm_viridian_domain_context {
>  DECLARE_HVM_SAVE_TYPE(VIRIDIAN_DOMAIN, 15, struct 
> hvm_viridian_domain_context);
>  
>  struct hvm_viridian_vcpu_context {
> -    uint64_t apic_assist;
> +    uint64_t apic_assist_msr;
> +    uint16_t apic_assist_vector;

An explicit uint16_t[3] _pad; please.

~Andrew

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