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Re: [Xen-devel] [PATCH v2 9/9] viridian: introduce struct viridian_page

On Wed, Oct 31, 2018 at 12:43:35PM +0000, Paul Durrant wrote:
> The 'vp_assist' page is currently an example of a guest page which needs to
> be kept mapped throughout the life-time of a guest, but there are other
> such examples in the specifiction [1]. This patch therefore introduces a
> generic 'viridian_page' type and converts the current vp_assist/apic_assist
> related code to use it. Subsequent patches implementing other enlightments
> can then also make use of it.
> This patch also renames the 'vp_assist_pending' field in struct
> hvm_viridian_vcpu_context to 'apic_assist_pending' to more accurately
> reflect its meaning. The term 'vp_assist' applies to the whole page rather
> than just the EOI-avoidance enlightenment. New versons of the specification
> have defined data structures for other enlightenments within the same page.
> No functional change.
> [1] 
> https://github.com/MicrosoftDocs/Virtualization-Documentation/raw/live/tlfs/Hypervisor%20Top%20Level%20Functional%20Specification%20v5.0C.pdf
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Reviewed-by: Roger Pau Monne <roger.pau@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

> diff --git a/xen/include/public/arch-x86/hvm/save.h 
> b/xen/include/public/arch-x86/hvm/save.h
> index 4691d4d4aa..80e762c335 100644
> --- a/xen/include/public/arch-x86/hvm/save.h
> +++ b/xen/include/public/arch-x86/hvm/save.h
> @@ -600,7 +600,7 @@ DECLARE_HVM_SAVE_TYPE(VIRIDIAN_DOMAIN, 15, struct 
> hvm_viridian_domain_context);
>  struct hvm_viridian_vcpu_context {
>      uint64_t vp_assist_msr;
> -    uint8_t  vp_assist_pending;
> +    uint8_t  apic_assist_pending;

FTR I believe it is safe to do so because this is (eventually) used by
domctl interfaces.


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