[PATCH v3 27/27] KVM: nVMX: Allow VMX FRED controls

From: Xin Li (Intel)
Date: Tue Oct 01 2024 - 01:03:00 EST


From: Xin Li <xin3.li@xxxxxxxxx>

Allow nVMX FRED controls as nested FRED support is in place.

Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
Signed-off-by: Xin Li (Intel) <xin@xxxxxxxxx>
Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 6 ++++--
arch/x86/kvm/vmx/vmx.c | 1 +
2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 1fbdeea32c98..b1b4483afcda 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -7159,7 +7159,8 @@ static void nested_vmx_setup_exit_ctls(struct vmcs_config *vmcs_conf,
* advertise any feature in it to nVMX until its nVMX support
* is ready.
*/
- msrs->secondary_exit_ctls &= 0;
+ msrs->secondary_exit_ctls &= SECONDARY_VM_EXIT_SAVE_IA32_FRED |
+ SECONDARY_VM_EXIT_LOAD_IA32_FRED;
}
}

@@ -7174,7 +7175,8 @@ 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);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 522ee27a4655..ba6a7c6b6727 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7923,6 +7923,7 @@ 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
}
--
2.46.2