[PATCH v1 17/23] KVM: nVMX: Add support for VMX FRED controls

[Xin Li]

Add VMX FRED controls to nested VMX controls and set the VMX
nested-exception support bit (bit 58) in the nested IA32_VMX_BASIC MSR
when FRED is enabled.

Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
---
 arch/x86/kvm/vmx/hyperv.c |  7 +++++--
 arch/x86/kvm/vmx/nested.c | 14 ++++++++++----
 arch/x86/kvm/vmx/vmx.c    |  3 +++
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/vmx/hyperv.c b/arch/x86/kvm/vmx/hyperv.c
index b12ef8fd76c9..28fca62f3887 100644
--- a/arch/x86/kvm/vmx/hyperv.c
+++ b/arch/x86/kvm/vmx/hyperv.c
@@ -106,7 +106,9 @@
 	 VM_EXIT_CLEAR_IA32_RTIT_CTL |					\
 	 VM_EXIT_ACTIVATE_SECONDARY_CONTROLS)
 
-#define EVMCS1_SUPPORTED_VMEXIT_CTRL2 (0ULL)
+#define EVMCS1_SUPPORTED_VMEXIT_CTRL2					\
+	(SECONDARY_VM_EXIT_SAVE_IA32_FRED |				\
+	 SECONDARY_VM_EXIT_LOAD_IA32_FRED)
 
 #define EVMCS1_SUPPORTED_VMENTRY_CTRL					\
 	(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR |				\
@@ -117,7 +119,8 @@
 	 VM_ENTRY_LOAD_IA32_EFER |					\
 	 VM_ENTRY_LOAD_BNDCFGS |					\
 	 VM_ENTRY_PT_CONCEAL_PIP |					\
-	 VM_ENTRY_LOAD_IA32_RTIT_CTL)
+	 VM_ENTRY_LOAD_IA32_RTIT_CTL |					\
+	 VM_ENTRY_LOAD_IA32_FRED)
 
 #define EVMCS1_SUPPORTED_VMFUNC (0)
 
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index af616c4a3491..b85cd5c0ec98 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1230,10 +1230,12 @@ static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask)
 #define VMX_BASIC_FEATURES_MASK			\
 	(VMX_BASIC_DUAL_MONITOR_TREATMENT |	\
 	 VMX_BASIC_INOUT |			\
-	 VMX_BASIC_TRUE_CTLS)
+	 VMX_BASIC_TRUE_CTLS |			\
+	 VMX_BASIC_NESTED_EXCEPTION)
 
-#define VMX_BASIC_RESERVED_BITS			\
-	(GENMASK_ULL(63, 56) | GENMASK_ULL(47, 45) | BIT_ULL(31))
+#define VMX_BASIC_RESERVED_BITS				\
+	(GENMASK_ULL(63, 59) | GENMASK_ULL(57, 56) |	\
+	 GENMASK_ULL(47, 45) | BIT_ULL(31))
 
 static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data)
 {
@@ -6985,7 +6987,8 @@ static void nested_vmx_setup_entry_ctls(struct vmcs_config *vmcs_conf,
 #ifdef CONFIG_X86_64
 		VM_ENTRY_IA32E_MODE |
 #endif
-		VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS;
+		VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS |
+		VM_ENTRY_LOAD_IA32_FRED;
 	msrs->entry_ctls_high |=
 		(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER |
 		 VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL);
@@ -7141,6 +7144,9 @@ static void nested_vmx_setup_basic(struct nested_vmx_msrs *msrs)
 
 	if (cpu_has_vmx_basic_inout())
 		msrs->basic |= VMX_BASIC_INOUT;
+
+	if (cpu_feature_enabled(X86_FEATURE_FRED))
+		msrs->basic |= VMX_BASIC_NESTED_EXCEPTION;
 }
 
 static void nested_vmx_setup_cr_fixed(struct nested_vmx_msrs *msrs)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b826dc188fc7..3353fd6615a2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7970,6 +7970,9 @@ static void nested_vmx_cr_fixed1_bits_update(struct kvm_vcpu *vcpu)
 	cr4_fixed1_update(X86_CR4_UMIP,       ecx, feature_bit(UMIP));
 	cr4_fixed1_update(X86_CR4_LA57,       ecx, feature_bit(LA57));
 
+	entry = kvm_find_cpuid_entry_index(vcpu, 0x7, 1);
+	cr4_fixed1_update(X86_CR4_FRED,       eax, feature_bit(FRED));
+
 #undef cr4_fixed1_update
 }
 
-- 
2.42.0