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Re: [PATCH v5 1/4] target/i386: add missing vmx features for several CPU


From: Xiaoyao Li
Subject: Re: [PATCH v5 1/4] target/i386: add missing vmx features for several CPU models
Date: Mon, 13 Jul 2020 15:45:55 +0800
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 7/13/2020 3:23 PM, Chenyi Qiang wrote:


On 7/11/2020 12:48 AM, Eduardo Habkost wrote:
On Fri, Jul 10, 2020 at 09:45:49AM +0800, Chenyi Qiang wrote:


On 7/10/2020 6:12 AM, Eduardo Habkost wrote:

I'm very sorry for taking so long to review this.  Question
below:

On Fri, Jun 19, 2020 at 03:31:11PM +0800, Chenyi Qiang wrote:
Add some missing VMX features in Skylake-Server, Cascadelake-Server and
Icelake-Server CPU models based on the output of Paolo's script.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>

Why are you changing the v1 definition instead adding those new
features in a new version of the CPU model, just like you did in
patch 3/4?


I suppose these missing vmx features are not quite necessary for customers.
Just post it here to see if they are worth being added.
Adding a new version is reasonable. Is it appropriate to put all the missing
features in patch 1/4, 3/4, 4/4 in a same version?

Yes, it would be OK to add only one new version with all the new
features.


During the coding, I prefer to split the missing vmx features into a new version of CPU model, because the vmx features depends on CPUID_EXT_VMX. I think It would be better to distinguish it instead of enabling the vmx transparently. i.e.
{
     .version = 4,
     .props = (PropValue[]) {
         { "sha-ni", "on" },
         ... ...
         { "model", "106" },
                 { /* end of list */ }
     },
},
{
     .version = 5,
     .props = (PropValue[]) {
         { "vmx", "on" }

Chenyi,

This is not we have discussed. I prefer to changing the logic of versioned CPU model to not add the features in versioned CPU model to env->user_features[]. They're not supposed to be added to env->user_features[] since they're not set by user through -feature/+feature

Eduardo,

What do you think?




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