Re: [Xen-devel] [PATCH v5 08/16] x86: implement set value flow for MBA

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Sat, Sep 30, 2017 at 01:39:18AM +0000, Yi Sun wrote:
> This patch implements set value flow for MBA including its callback
> function and domctl interface.
> 
> It also changes the memebers in 'cos_write_info' to transfer the
> feature array, feature properties array and value array. Then, we
> can write all features values on the cos id into MSRs.
> 
> Because multiple features may co-exist, we need handle all features to write
> values of them into a COS register with new COS ID. E.g:
> 1. L3 CAT and MBA co-exist.
> 2. Dom1 and Dom2 share a same COS ID (2). The L3 CAT CBM of Dom1 is 0x1ff,
>    the MBA Thrtle of Dom1 is 0xa.
> 3. User wants to change MBA Thrtl of Dom1 to be 0x14. Because COS ID 2 is
>    used by Dom2 too, we have to pick a new COS ID 3. The values of Dom1 on
>    COS ID 3 are all default values as below:
>            ---------
>            | COS 3 |
>            ---------
>    L3 CAT  | 0x7ff |
>            ---------
>    MBA     | 0x0   |
>            ---------
> 4. After setting, the L3 CAT CBM value of Dom1 should be kept and the new MBA
>    Thrtl is set. So, the values on COS ID 3 should be below.
>            ---------
>            | COS 3 |
>            ---------
>    L3 CAT  | 0x1ff |
>            ---------
>    MBA     | 0x14  |
>            ---------
> 
> So, we should write all features values into their MSRs. That requires the
> feature array, feature properties array and value array are input.
> 
> Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>

AFAICT this patch needs to be rebased on top of:

<1507281180-5101-1-git-send-email-yi.y.sun@xxxxxxxxxxxxxxx>

Roger.

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