Adds reporting SPP capability from VMX Procbased MSR, according to
the definition of hardware spec, bit 32 is the control of the SPP
capability.
Defined X86_FEATURE_SPP under intel X86 VT-x CPU features.
Defined the X86_VMX_FEATURE_PROC_CTLS2_SPP in intel VMX MSR indicated
features, And enable SPP capability by this MSR.
Signed-off-by: Zhang Yi <yi.z.zh...@linux.intel.com>
Signed-off-by: He Chen <he.c...@linux.intel.com>
---
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/kernel/cpu/intel.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/arch/x86/include/asm/cpufeatures.h
b/arch/x86/include/asm/cpufeatures.h
index 28c4a50..e22567e 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -228,6 +228,7 @@
#define X86_FEATURE_FLEXPRIORITY ( 8*32+ 2) /* Intel FlexPriority */
#define X86_FEATURE_EPT ( 8*32+ 3) /* Intel Extended
Page Table */
#define X86_FEATURE_VPID ( 8*32+ 4) /* Intel Virtual Processor
ID */
+#define X86_FEATURE_SPP ( 8*32+ 5) /* Intel EPT-based
Sub-Page Write Protection */
#define X86_FEATURE_VMMCALL ( 8*32+15) /* Prefer VMMCALL to VMCALL
*/
#define X86_FEATURE_XENPV ( 8*32+16) /* "" Xen paravirtual guest
*/
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index fc3c07f..b55156c 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -476,6 +476,7 @@ static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
#define x86_VMX_FEATURE_EPT_CAP_AD 0x00200000
+#define X86_VMX_FEATURE_PROC_CTLS2_SPP 0x00800000
u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
u32 msr_vpid_cap, msr_ept_cap;
@@ -486,6 +487,7 @@ static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
clear_cpu_cap(c, X86_FEATURE_EPT);
clear_cpu_cap(c, X86_FEATURE_VPID);
clear_cpu_cap(c, X86_FEATURE_EPT_AD);
+ clear_cpu_cap(c, X86_FEATURE_SPP);
rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
msr_ctl = vmx_msr_high | vmx_msr_low;
@@ -509,6 +511,8 @@ static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
}
if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
set_cpu_cap(c, X86_FEATURE_VPID);
+ if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_SPP)
+ set_cpu_cap(c, X86_FEATURE_SPP);
}
}
--
2.7.4
