[PATCH for-4.2 1/2] i386: Add new versions of Skylake/Cascadelake/Icelake without TSX

[Eduardo Habkost]

One of the mitigation methods for TAA[1] is to disable TSX
support on the host system.  Linux added a mechanism to disable
TSX globally through the kernel command line, and many Linux
distributions now default to tsx=off.  This makes existing CPU
models that have HLE and RTM enabled not usable anymore.

Add new versions of all CPU models that have the HLE and RTM
features enabled, that can be used when TSX is disabled in the
host system.

References:

[1] TAA, TSX asynchronous Abort:
    
https://software.intel.com/security-software-guidance/insights/deep-dive-intel-transactional-synchronization-extensions-intel-tsx-asynchronous-abort
    
https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html

Signed-off-by: Eduardo Habkost <address@hidden>
---
 target/i386/cpu.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 296b491607..0267e08612 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2474,6 +2474,14 @@ static X86CPUDefinition builtin_x86_defs[] = {
                     { /* end of list */ }
                 }
             },
+            {
+                .version = 3,
+                .props = (PropValue[]) {
+                    { "hle", "off" },
+                    { "rtm", "off" },
+                    { /* end of list */ }
+                }
+            },
             { /* end of list */ }
         }
     },
@@ -2541,6 +2549,14 @@ static X86CPUDefinition builtin_x86_defs[] = {
                     { /* end of list */ }
                 }
             },
+            {
+                .version = 3,
+                .props = (PropValue[]) {
+                    { "hle", "off" },
+                    { "rtm", "off" },
+                    { /* end of list */ }
+                }
+            },
             { /* end of list */ }
         }
     },
@@ -2608,6 +2624,13 @@ static X86CPUDefinition builtin_x86_defs[] = {
                   { /* end of list */ }
               },
             },
+            { .version = 3,
+              .props = (PropValue[]) {
+                  { "hle", "off" },
+                  { "rtm", "off" },
+                  { /* end of list */ }
+              },
+            },
             { /* end of list */ }
         }
     },
@@ -2665,6 +2688,18 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_6_EAX_ARAT,
         .xlevel = 0x80000008,
         .model_id = "Intel Core Processor (Icelake)",
+        .versions = (X86CPUVersionDefinition[]) {
+            { .version = 1 },
+            {
+                .version = 2,
+                .props = (PropValue[]) {
+                    { "hle", "off" },
+                    { "rtm", "off" },
+                    { /* end of list */ }
+                },
+            },
+            { /* end of list */ }
+        }
     },
     {
         .name = "Icelake-Server",
@@ -2723,6 +2758,18 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_6_EAX_ARAT,
         .xlevel = 0x80000008,
         .model_id = "Intel Xeon Processor (Icelake)",
+        .versions = (X86CPUVersionDefinition[]) {
+            { .version = 1 },
+            {
+                .version = 2,
+                .props = (PropValue[]) {
+                    { "hle", "off" },
+                    { "rtm", "off" },
+                    { /* end of list */ }
+                },
+            },
+            { /* end of list */ }
+        }
     },
     {
         .name = "Denverton",
-- 
2.21.0