[PATCH v6 03/11] x86/vmx: add IPT cpu feature

[Michał Leszczyński <michal.leszczynski@xxxxxxx>]

From: Michal Leszczynski <michal.leszczynski@xxxxxxx>

Check if Intel Processor Trace feature is supported by current
processor. Define vmtrace_supported global variable.

Signed-off-by: Michal Leszczynski <michal.leszczynski@xxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c                 | 15 ++++++++++++++-
 xen/common/domain.c                         |  2 ++
 xen/include/asm-x86/cpufeature.h            |  1 +
 xen/include/asm-x86/hvm/vmx/vmcs.h          |  1 +
 xen/include/public/arch-x86/cpufeatureset.h |  1 +
 xen/include/xen/domain.h                    |  2 ++
 6 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index ca94c2bedc..3a53553f10 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -291,6 +291,20 @@ static int vmx_init_vmcs_config(void)
         _vmx_cpu_based_exec_control &=
             ~(CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING);
 
+    rdmsrl(MSR_IA32_VMX_MISC, _vmx_misc_cap);
+
+    /* Check whether IPT is supported in VMX operation. */
+    if ( !smp_processor_id() )
+        vmtrace_supported = cpu_has_ipt &&
+                            (_vmx_misc_cap & VMX_MISC_PROC_TRACE);
+    else if ( vmtrace_supported &&
+              !(_vmx_misc_cap & VMX_MISC_PROC_TRACE) )
+    {
+        printk("VMX: IPT capabilities fatally differ between CPU%u and CPU0\n",
+               smp_processor_id());
+        return -EINVAL;
+    }
+
     if ( _vmx_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS )
     {
         min = 0;
@@ -305,7 +319,6 @@ static int vmx_init_vmcs_config(void)
                SECONDARY_EXEC_ENABLE_VIRT_EXCEPTIONS |
                SECONDARY_EXEC_XSAVES |
                SECONDARY_EXEC_TSC_SCALING);
-        rdmsrl(MSR_IA32_VMX_MISC, _vmx_misc_cap);
         if ( _vmx_misc_cap & VMX_MISC_VMWRITE_ALL )
             opt |= SECONDARY_EXEC_ENABLE_VMCS_SHADOWING;
         if ( opt_vpid_enabled )
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 7cc9526139..a45cf023f7 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -82,6 +82,8 @@ struct vcpu *idle_vcpu[NR_CPUS] __read_mostly;
 
 vcpu_info_t dummy_vcpu_info;
 
+bool vmtrace_supported __read_mostly;
+
 static void __domain_finalise_shutdown(struct domain *d)
 {
     struct vcpu *v;
diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index f790d5c1f8..555f696a26 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -104,6 +104,7 @@
 #define cpu_has_clwb            boot_cpu_has(X86_FEATURE_CLWB)
 #define cpu_has_avx512er        boot_cpu_has(X86_FEATURE_AVX512ER)
 #define cpu_has_avx512cd        boot_cpu_has(X86_FEATURE_AVX512CD)
+#define cpu_has_ipt             boot_cpu_has(X86_FEATURE_PROC_TRACE)
 #define cpu_has_sha             boot_cpu_has(X86_FEATURE_SHA)
 #define cpu_has_avx512bw        boot_cpu_has(X86_FEATURE_AVX512BW)
 #define cpu_has_avx512vl        boot_cpu_has(X86_FEATURE_AVX512VL)
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 906810592f..6153ba6769 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -283,6 +283,7 @@ extern u32 vmx_secondary_exec_control;
 #define VMX_VPID_INVVPID_SINGLE_CONTEXT_RETAINING_GLOBAL 0x80000000000ULL
 extern u64 vmx_ept_vpid_cap;
 
+#define VMX_MISC_PROC_TRACE                     0x00004000
 #define VMX_MISC_CR3_TARGET                     0x01ff0000
 #define VMX_MISC_VMWRITE_ALL                    0x20000000
 
diff --git a/xen/include/public/arch-x86/cpufeatureset.h 
b/xen/include/public/arch-x86/cpufeatureset.h
index fe7492a225..2c91862f2d 100644
--- a/xen/include/public/arch-x86/cpufeatureset.h
+++ b/xen/include/public/arch-x86/cpufeatureset.h
@@ -217,6 +217,7 @@ XEN_CPUFEATURE(SMAP,          5*32+20) /*S  Supervisor Mode 
Access Prevention */
 XEN_CPUFEATURE(AVX512_IFMA,   5*32+21) /*A  AVX-512 Integer Fused Multiply Add 
*/
 XEN_CPUFEATURE(CLFLUSHOPT,    5*32+23) /*A  CLFLUSHOPT instruction */
 XEN_CPUFEATURE(CLWB,          5*32+24) /*A  CLWB instruction */
+XEN_CPUFEATURE(PROC_TRACE,    5*32+25) /*   Processor Tracing feature */
 XEN_CPUFEATURE(AVX512PF,      5*32+26) /*A  AVX-512 Prefetch Instructions */
 XEN_CPUFEATURE(AVX512ER,      5*32+27) /*A  AVX-512 Exponent & Reciprocal 
Instrs */
 XEN_CPUFEATURE(AVX512CD,      5*32+28) /*A  AVX-512 Conflict Detection Instrs 
*/
diff --git a/xen/include/xen/domain.h b/xen/include/xen/domain.h
index 7e51d361de..61ebc6c24d 100644
--- a/xen/include/xen/domain.h
+++ b/xen/include/xen/domain.h
@@ -130,4 +130,6 @@ struct vnuma_info {
 
 void vnuma_destroy(struct vnuma_info *vnuma);
 
+extern bool vmtrace_supported;
+
 #endif /* __XEN_DOMAIN_H__ */
-- 
2.17.1