linux-kernel - [PATCH v2 20/25] KVM: nVMX: Add support for VMX FRED controls

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Message-ID: <20240207172646.3981-21-xin3.li@intel.com>
Date: Wed,  7 Feb 2024 09:26:40 -0800
From: Xin Li <xin3.li@...el.com>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Cc: seanjc@...gle.com,
	pbonzini@...hat.com,
	corbet@....net,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	shuah@...nel.org,
	vkuznets@...hat.com,
	peterz@...radead.org,
	ravi.v.shankar@...el.com,
	xin@...or.com
Subject: [PATCH v2 20/25] KVM: nVMX: Add support for VMX FRED controls

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.

Signed-off-by: Xin Li <xin3.li@...el.com>
Tested-by: Shan Kang <shan.kang@...el.com>
---
 arch/x86/kvm/vmx/nested.c | 14 ++++++++++----
 arch/x86/kvm/vmx/vmx.c    |  1 +
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index f9c1fbeac302..04a9cdb0361f 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1239,10 +1239,12 @@ 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)
 {
@@ -6988,7 +6990,8 @@ 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);
@@ -7147,6 +7150,9 @@ static void nested_vmx_setup_basic(struct nested_vmx_msrs *msrs)
 
 	if (cpu_has_vmx_basic_inout())
 		msrs->basic |= VMX_BASIC_INOUT;
+
+	if (kvm_cpu_cap_has(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 fc808d599493..1005b6a57d23 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7915,6 +7915,7 @@ static void nested_vmx_cr_fixed1_bits_update(struct kvm_vcpu *vcpu)
 
 	entry = kvm_find_cpuid_entry_index(vcpu, 0x7, 1);
 	cr4_fixed1_update(X86_CR4_LAM_SUP,    eax, feature_bit(LAM));
+	cr4_fixed1_update(X86_CR4_FRED,       eax, feature_bit(FRED));
 
 #undef cr4_fixed1_update
 }
-- 
2.43.0