From: Zhang Yi Z <[email protected]> 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 Z <[email protected]> Signed-off-by: He Chen <[email protected]> --- 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 2519c6c..36cd3b9 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -211,6 +211,7 @@ #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 dfa90a3..242978b 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -425,6 +425,7 @@ static void detect_vmx_virtcap(struct cpuinfo_x86 *c) #define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001 #define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002 #define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020 +#define X86_VMX_FEATURE_PROC_CTLS2_SPP 0x00800000 u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2; @@ -433,6 +434,7 @@ static void detect_vmx_virtcap(struct cpuinfo_x86 *c) clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY); clear_cpu_cap(c, X86_FEATURE_EPT); clear_cpu_cap(c, X86_FEATURE_VPID); + 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; @@ -451,6 +453,8 @@ static void detect_vmx_virtcap(struct cpuinfo_x86 *c) set_cpu_cap(c, X86_FEATURE_EPT); 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
