[v4,3/3] KVM: x86: Move MPK feature detection to common code

Commit Message

Babu Moger May 12, 2020, 11:59 p.m. UTC

Both Intel and AMD support (MPK) Memory Protection Key feature.
Move the feature detection from VMX to the common code. It should
work for both the platforms now.

Signed-off-by: Babu Moger <[e-mail]>
---
 arch/x86/kvm/cpuid.c   |    9 ++++++++-
 arch/x86/kvm/vmx/vmx.c |    4 ----
 2 files changed, 8 insertions(+), 5 deletions(-)

Patch

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 901cd1fdecd9..d2c36768667d 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -326,7 +326,7 @@  void kvm_set_cpu_caps(void)
 	);
 
 	kvm_cpu_cap_mask(CPUID_7_ECX,
-		F(AVX512VBMI) | F(LA57) | 0 /*PKU*/ | 0 /*OSPKE*/ | F(RDPID) |
+		F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ | F(RDPID) |
 		F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) |
 		F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) |
 		F(CLDEMOTE) | F(MOVDIRI) | F(MOVDIR64B) | 0 /*WAITPKG*/
@@ -335,6 +335,13 @@  void kvm_set_cpu_caps(void)
 	if (cpuid_ecx(7) & F(LA57))
 		kvm_cpu_cap_set(X86_FEATURE_LA57);
 
+	/*
+	 * PKU not yet implemented for shadow paging and requires OSPKE
+	 * to be set on the host. Clear it if that is not the case
+	 */
+	if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE))
+		kvm_cpu_cap_clear(X86_FEATURE_PKU);
+
 	kvm_cpu_cap_mask(CPUID_7_EDX,
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
 		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) |
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46898a476ba7..d153732ed88f 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7136,10 +7136,6 @@  static __init void vmx_set_cpu_caps(void)
 	if (vmx_pt_mode_is_host_guest())
 		kvm_cpu_cap_check_and_set(X86_FEATURE_INTEL_PT);
 
-	/* PKU is not yet implemented for shadow paging. */
-	if (enable_ept && boot_cpu_has(X86_FEATURE_OSPKE))
-		kvm_cpu_cap_check_and_set(X86_FEATURE_PKU);
-
 	if (vmx_umip_emulated())
 		kvm_cpu_cap_set(X86_FEATURE_UMIP);