Re: [PATCH] target/i386: Remove monitor from some CPU model

[Tao Xu <tao3.xu@intel.com>]

I am so forry for sending this old version patch by mistake.

Please ignore this patch.

On 12/2/2019 2:28 PM, Xu, Tao3 wrote:
> Add new version of Snowridge, Denverton, Opteron_G3, EPYC, and Dhyana
> CPU model to remove MONITOR/MWAIT feature.
> 
> After QEMU/KVM use "-overcommit cpu-pm=on" to expose MONITOR/MWAIT
> (commit id 6f131f13e68d648a8e4f083c667ab1acd88ce4cd), the MONITOR/MWAIT
> feature in these CPU model is unused.
> 
> Signed-off-by: Tao Xu <tao3.xu@intel.com>
> ---
>   target/i386/cpu.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 58 insertions(+)
> 
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index a624163ac2..7c5f1e8fe0 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -2770,6 +2770,19 @@ static X86CPUDefinition builtin_x86_defs[] = {
>               MSR_ARCH_CAP_RDCL_NO | MSR_ARCH_CAP_SKIP_L1DFL_VMENTRY,
>           .xlevel = 0x80000008,
>           .model_id = "Intel Atom Processor (Denverton)",
> +        .versions = (X86CPUVersionDefinition[]) {
> +            { .version = 1 },
> +            {
> +                .version = 2,
> +                .props = (PropValue[]) {
> +                    { "monitor", "off" },
> +                    { "model-id",
> +                      "Intel Atom Processor (Denverton, no MONITOR)" },
> +                    { /* end of list */ },
> +                },
> +            },
> +            { /* end of list */ },
> +        },
>       },
>       {
>           .name = "Snowridge",
> @@ -2850,6 +2863,16 @@ static X86CPUDefinition builtin_x86_defs[] = {
>                       { /* end of list */ },
>                   },
>               },
> +            {
> +                .version = 3,
> +                .props = (PropValue[]) {
> +                    /* mpx was already removed by -v2 above */
> +                    { "monitor", "off" },
> +                    { "model-id",
> +                      "Intel Atom Processor (Snowridge, no MPX, no MONITOR)" },
> +                    { /* end of list */ },
> +                },
> +            },
>               { /* end of list */ },
>           },
>       },
> @@ -2961,6 +2984,19 @@ static X86CPUDefinition builtin_x86_defs[] = {
>               CPUID_EXT3_ABM | CPUID_EXT3_SVM | CPUID_EXT3_LAHF_LM,
>           .xlevel = 0x80000008,
>           .model_id = "AMD Opteron 23xx (Gen 3 Class Opteron)",
> +        .versions = (X86CPUVersionDefinition[]) {
> +            { .version = 1 },
> +            {
> +                .version = 2,
> +                .props = (PropValue[]) {
> +                    { "monitor", "off" },
> +                    { "model-id",
> +                      "AMD Opteron 23xx (Gen 3 Class Opteron, no MONITOR)" },
> +                    { /* end of list */ },
> +                },
> +            },
> +            { /* end of list */ },
> +        },
>       },
>       {
>           .name = "Opteron_G4",
> @@ -3085,6 +3121,16 @@ static X86CPUDefinition builtin_x86_defs[] = {
>                       { /* end of list */ }
>                   }
>               },
> +            {
> +                .version = 3,
> +                .props = (PropValue[]) {
> +                    /* ibpb was already enabled by -v2 above */
> +                    { "monitor", "off" },
> +                    { "model-id",
> +                      "AMD EPYC Processor (with IBPB, no MONITOR)" },
> +                    { /* end of list */ },
> +                },
> +            },
>               { /* end of list */ }
>           }
>       },
> @@ -3137,6 +3183,18 @@ static X86CPUDefinition builtin_x86_defs[] = {
>           .xlevel = 0x8000001E,
>           .model_id = "Hygon Dhyana Processor",
>           .cache_info = &epyc_cache_info,
> +        .versions = (X86CPUVersionDefinition[]) {
> +            { .version = 1 },
> +            {
> +                .version = 2,
> +                .props = (PropValue[]) {
> +                    { "monitor", "off" },
> +                    { "model-id", "Hygon Dhyana Processor (no MONITOR)" },
> +                    { /* end of list */ },
> +                },
> +            },
> +            { /* end of list */ },
> +        },
>       },
>   };
>   
>