Re: [Xen-devel] [PATCH 1/9] x86/vmx: API improvements for MSR load/save infrastructure

[Roger Pau Monné]

On Tue, May 22, 2018 at 12:20:38PM +0100, Andrew Cooper wrote:
> diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
> b/xen/include/asm-x86/hvm/vmx/vmcs.h
> index 06c3179..c8a1f89 100644
> --- a/xen/include/asm-x86/hvm/vmx/vmcs.h
> +++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
> @@ -514,9 +514,6 @@ enum vmcs_field {
>  
>  #define VMCS_VPID_WIDTH 16
>  
> -#define VMX_GUEST_MSR 0
> -#define VMX_HOST_MSR  1
> -
>  /* VM Instruction error numbers */
>  enum vmx_insn_errno
>  {
> @@ -534,6 +531,54 @@ enum vmx_insn_errno
>      VMX_INSN_FAIL_INVALID                  = ~0,
>  };
>  
> +/* MSR load/save list infrastructure. */
> +enum vmx_msr_list_type {
> +    VMX_MSR_HOST,
> +    VMX_MSR_GUEST,
> +};
> +
> +int vmx_add_msr(uint32_t msr, enum vmx_msr_list_type type);
> +
> +static inline int vmx_add_host_load_msr(uint32_t msr)
> +{
> +    return vmx_add_msr(msr, VMX_MSR_HOST);
> +}
> +
> +static inline int vmx_add_guest_msr(uint32_t msr)
> +{
> +    return vmx_add_msr(msr, VMX_MSR_GUEST);
> +}
> +
> +struct vmx_msr_entry *vmx_find_msr(uint32_t msr, enum vmx_msr_list_type 
> type);
> +
> +static inline int vmx_read_guest_msr(uint32_t msr, uint64_t *val)
> +{
> +    struct vmx_msr_entry *ent;

const

Also I would probably do:

{
    const struct vmx_msr_entry *ent = vmx_find_msr(msr, VMX_MSR_GUEST);

    if ( !ent )
        return -ESRCH;

    *val = ent->data;
    return 0;
}

With the const:

Reviewed-by: Roger Pau Monné <roger....@citrix.com>

Thanks, Roger.

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