Re: [Xen-devel] [PATCH v6 04/19] intel/VPMU: Clean up Intel VPMU code

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.05.14 at 17:53, <boris.ostrovsky@xxxxxxxxxx> wrote:
> +void vmx_rm_guest_msr(u32 msr)
> +{
> +    struct vcpu *curr = current;
> +    unsigned int idx, msr_count = curr->arch.hvm_vmx.msr_count;
> +    struct vmx_msr_entry *msr_area = curr->arch.hvm_vmx.msr_area;
> +
> +    if ( msr_area == NULL )
> +        return;
> +
> +    for ( idx = 0; idx < msr_count; idx++ )
> +        if ( msr_area[idx].index == msr )
> +            break;
> +
> +    if ( idx == msr_count )
> +        return;
> +
> +    for ( ; idx < msr_count - 1; idx++ )
> +    {
> +        msr_area[idx].index = msr_area[idx + 1].index;
> +        msr_area[idx].data = msr_area[idx + 1].data;
> +    }

Perhaps more efficiently done via memmove()?

> +    msr_area[msr_count - 1].index = 0;
> +
> +    curr->arch.hvm_vmx.msr_count = --msr_count;

This decrement could obviously be pulled up, avoiding earlier
"msr_count - 1".

Jan


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