[PATCH v2 0/4] modify CPU model info

[PATCH v2 0/4] modify CPU model info

[Chenyi Qiang]

Add the missing VMX features in Skylake-Server, Cascadelake-Server and
Icelake-Server CPU models. In Icelake-Server CPU model, it also lacks
sha_ni, avx512ifma, rdpid and fsrm. The model numbers of Icelake-Client
and Icelake-Server need to be fixed.

Changes in v2:
	- add missing features as a new version of CPU model
	- add the support of FSRM

Chenyi Qiang (4):
  target/i386: add missing vmx features for several CPU models
  target/i386: add fast short REP MOV support
  target/i386: add the missing features for Icelake-Server CPU model
  target/i386: modify Icelake-Client and Icelake-Server CPU model number

 target/i386/cpu.c | 22 ++++++++++++++++++----
 target/i386/cpu.h |  2 ++
 2 files changed, 20 insertions(+), 4 deletions(-)

-- 
2.17.1

[PATCH v2 1/4] target/i386: add missing vmx features for several CPU models

[Chenyi Qiang]

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>
---
 target/i386/cpu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 34b511f078..4123d5910e 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -3059,6 +3059,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
              VMX_SECONDARY_EXEC_RDRAND_EXITING | VMX_SECONDARY_EXEC_ENABLE_INVPCID |
              VMX_SECONDARY_EXEC_ENABLE_VMFUNC | VMX_SECONDARY_EXEC_SHADOW_VMCS |
              VMX_SECONDARY_EXEC_RDSEED_EXITING | VMX_SECONDARY_EXEC_ENABLE_PML,
+        .features[FEAT_VMX_VMFUNC] = MSR_VMX_VMFUNC_EPT_SWITCHING,
         .xlevel = 0x80000008,
         .model_id = "Intel Xeon Processor (Skylake)",
         .versions = (X86CPUVersionDefinition[]) {
@@ -3187,6 +3188,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
              VMX_SECONDARY_EXEC_RDRAND_EXITING | VMX_SECONDARY_EXEC_ENABLE_INVPCID |
              VMX_SECONDARY_EXEC_ENABLE_VMFUNC | VMX_SECONDARY_EXEC_SHADOW_VMCS |
              VMX_SECONDARY_EXEC_RDSEED_EXITING | VMX_SECONDARY_EXEC_ENABLE_PML,
+        .features[FEAT_VMX_VMFUNC] = MSR_VMX_VMFUNC_EPT_SWITCHING,
         .xlevel = 0x80000008,
         .model_id = "Intel Xeon Processor (Cascadelake)",
         .versions = (X86CPUVersionDefinition[]) {
@@ -3534,7 +3536,9 @@ static X86CPUDefinition builtin_x86_defs[] = {
              VMX_SECONDARY_EXEC_APIC_REGISTER_VIRT |
              VMX_SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
              VMX_SECONDARY_EXEC_RDRAND_EXITING | VMX_SECONDARY_EXEC_ENABLE_INVPCID |
-             VMX_SECONDARY_EXEC_ENABLE_VMFUNC | VMX_SECONDARY_EXEC_SHADOW_VMCS,
+             VMX_SECONDARY_EXEC_ENABLE_VMFUNC | VMX_SECONDARY_EXEC_SHADOW_VMCS |
+             VMX_SECONDARY_EXEC_RDSEED_EXITING | VMX_SECONDARY_EXEC_ENABLE_PML,
+        .features[FEAT_VMX_VMFUNC] = MSR_VMX_VMFUNC_EPT_SWITCHING,
         .xlevel = 0x80000008,
         .model_id = "Intel Xeon Processor (Icelake)",
         .versions = (X86CPUVersionDefinition[]) {
-- 
2.17.1

[PATCH v2 2/4] target/i386: add fast short REP MOV support

[Chenyi Qiang]

For CPUs support fast short REP MOV[CPUID.(EAX=7,ECX=0):EDX(bit4)], e.g
Icelake and Tigerlake, expose it to the guest VM.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
 target/i386/cpu.c | 2 +-
 target/i386/cpu.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 4123d5910e..b01421c6bb 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1077,7 +1077,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
         .type = CPUID_FEATURE_WORD,
         .feat_names = {
             NULL, NULL, "avx512-4vnniw", "avx512-4fmaps",
-            NULL, NULL, NULL, NULL,
+            "fsrm", NULL, NULL, NULL,
             NULL, NULL, "md-clear", NULL,
             NULL, NULL, NULL, NULL,
             NULL, NULL, NULL /* pconfig */, NULL,
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 60d797d594..f7ba813cab 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -770,6 +770,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
 #define CPUID_7_0_EDX_AVX512_4VNNIW     (1U << 2)
 /* AVX512 Multiply Accumulation Single Precision */
 #define CPUID_7_0_EDX_AVX512_4FMAPS     (1U << 3)
+/* Fast Short Rep Mov */
+#define CPUID_7_0_EDX_FSRM              (1U << 4)
 /* Speculation Control */
 #define CPUID_7_0_EDX_SPEC_CTRL         (1U << 26)
 /* Single Thread Indirect Branch Predictors */
-- 
2.17.1

[PATCH v2 3/4] target/i386: add the missing features for Icelake-Server CPU model

[Chenyi Qiang]

Add the SHA_NI and AVX512IFMA feature bits in FEAT_7_0_EBX, RDPID
feature bit in FEAT_7_0_ECX and FSRM feature bit in FEAT_7_0_EDX.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
 target/i386/cpu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index b01421c6bb..babb074abf 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -3552,6 +3552,16 @@ static X86CPUDefinition builtin_x86_defs[] = {
                     { /* end of list */ }
                 },
             },
+            {
+                .version = 3,
+                .props = (PropValue[]) {
+                    { "sha-ni", "on" },
+                    { "avx512ifma", "on" },
+                    { "rdpid", "on" },
+                    { "fsrm", "on" },
+                    { /* end of list */ }
+                },
+            },
             { /* end of list */ }
         }
     },
-- 
2.17.1

[PATCH v2 4/4] target/i386: modify Icelake-Client and Icelake-Server CPU model number

[Chenyi Qiang]

According to the Intel Icelake family list, Icelake-Client uses model
number 125(0x7D) and Icelake-Server uses model number 106(0x6A).

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
---
 target/i386/cpu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index babb074abf..5bd52f2c4b 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -3328,7 +3328,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .level = 0xd,
         .vendor = CPUID_VENDOR_INTEL,
         .family = 6,
-        .model = 126,
+        .model = 125,
         .stepping = 0,
         .features[FEAT_1_EDX] =
             CPUID_VME | CPUID_SSE2 | CPUID_SSE | CPUID_FXSR | CPUID_MMX |
@@ -3441,7 +3441,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
         .level = 0xd,
         .vendor = CPUID_VENDOR_INTEL,
         .family = 6,
-        .model = 134,
+        .model = 106,
         .stepping = 0,
         .features[FEAT_1_EDX] =
             CPUID_VME | CPUID_SSE2 | CPUID_SSE | CPUID_FXSR | CPUID_MMX |
-- 
2.17.1

Re: [PATCH v2 3/4] target/i386: add the missing features for Icelake-Server CPU model

[Xiaoyao Li]

On 3/28/2020 11:06 AM, Chenyi Qiang wrote:
> Add the SHA_NI and AVX512IFMA feature bits in FEAT_7_0_EBX, RDPID
> feature bit in FEAT_7_0_ECX and FSRM feature bit in FEAT_7_0_EDX.
> 
> Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
> ---
>   target/i386/cpu.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index b01421c6bb..babb074abf 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -3552,6 +3552,16 @@ static X86CPUDefinition builtin_x86_defs[] = {
>                       { /* end of list */ }
>                   },
>               },
> +            {
> +                .version = 3,

Maybe you need to make it as version = 4, since 3 is used to add 
ARCH_CAPABILITIES bits and the Patch is queued:

https://lore.kernel.org/qemu-devel/20200323183936.GA3784@habkost.net/

> +                .props = (PropValue[]) {
> +                    { "sha-ni", "on" },
> +                    { "avx512ifma", "on" },
> +                    { "rdpid", "on" },
> +                    { "fsrm", "on" },
> +                    { /* end of list */ }
> +                },
> +            },
>               { /* end of list */ }
>           }
>       },
> 

Re: [PATCH v2 3/4] target/i386: add the missing features for Icelake-Server CPU model

[Robert Hoo]

On Sat, 2020-03-28 at 11:06 +0800, Chenyi Qiang wrote:
> Add the SHA_NI and AVX512IFMA feature bits in FEAT_7_0_EBX, RDPID
> feature bit in FEAT_7_0_ECX and FSRM feature bit in FEAT_7_0_EDX.
> 
> Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
> ---
>  target/i386/cpu.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index b01421c6bb..babb074abf 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -3552,6 +3552,16 @@ static X86CPUDefinition builtin_x86_defs[] = {
>                      { /* end of list */ }
>                  },
>              },
> +            {
> +                .version = 3,
> +                .props = (PropValue[]) {
> +                    { "sha-ni", "on" },
> +                    { "avx512ifma", "on" },
> +                    { "rdpid", "on" },
> +                    { "fsrm", "on" },
> +                    { /* end of list */ }
> +                },
> +            },
>              { /* end of list */ }
I think these 4 new CPUIDs addition is to catch up latest 
https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf
 on updates.
This is actually fix to previous v1 definitions.
So my 2 cents:
1. add 1 more version: include v2's hle and rtm properties off
2. make the hle-rtm-disable inclusion version or this v3 default
version of icelake.
Anyway, v1 is not suitable for default choice.

Then questions comes to how to make non-v1 default.
Perhaps:

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 34b511f..d4eb3d6 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -5453,7 +5453,7 @@ static void
x86_register_cpudef_types(X86CPUDefinition *def)
     /* Unversioned model: */
     m = g_new0(X86CPUModel, 1);
     m->cpudef = def;
-    m->version = CPU_VERSION_AUTO;
+    m->version = CPU_VERSION_LATEST;
     m->is_alias = true;
     x86_register_cpu_model_type(def->name, m);

I think for builtin_x86_defs[] definitions, latest version is usually
preferable/suitable.
How would Paolo, Eduardo like it?
>          }
>      },

Re: [PATCH v2 0/4] modify CPU model info

[Chenyi Qiang]

Ping for comments.

Hi Paolo and Eduardo,

ARCH_CAPABILITIES has been added into Icelake-Server CPU model.
What your opinion of the missing feature bits in this patch set?

Thanks
Chenyi

On 3/28/2020 11:06 AM, Chenyi Qiang wrote:
> Add the missing VMX features in Skylake-Server, Cascadelake-Server and
> Icelake-Server CPU models. In Icelake-Server CPU model, it also lacks
> sha_ni, avx512ifma, rdpid and fsrm. The model numbers of Icelake-Client
> and Icelake-Server need to be fixed.
> 
> Changes in v2:
> 	- add missing features as a new version of CPU model
> 	- add the support of FSRM
> 
> Chenyi Qiang (4):
>    target/i386: add missing vmx features for several CPU models
>    target/i386: add fast short REP MOV support
>    target/i386: add the missing features for Icelake-Server CPU model
>    target/i386: modify Icelake-Client and Icelake-Server CPU model number
> 
>   target/i386/cpu.c | 22 ++++++++++++++++++----
>   target/i386/cpu.h |  2 ++
>   2 files changed, 20 insertions(+), 4 deletions(-)
>