[PATCH] KVM: TDX: Set SIGNIFCANT_INDEX flag for supported CPUIDs

[Changyuan Lyu]

Set the KVM_CPUID_FLAG_SIGNIFCANT_INDEX flag in the kvm_cpuid_entry2
structures returned by KVM_TDX_CAPABILITIES if the CPUID is indexed.
This ensures consistency with the CPUID entries returned by
KVM_GET_SUPPORTED_CPUID.

Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Changyuan Lyu <changyuanl@xxxxxxxxxx>
---
 arch/x86/kvm/vmx/tdx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 2d7a4d52ccfb4..1c039eab2f3d8 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -167,6 +167,7 @@ static void td_init_cpuid_entry2(struct kvm_cpuid_entry2 *entry, unsigned char i

 	entry->function = (u32)td_conf->cpuid_config_leaves[idx];
 	entry->index = td_conf->cpuid_config_leaves[idx] >> 32;
+	entry->flags = 0;
 	entry->eax = (u32)td_conf->cpuid_config_values[idx][0];
 	entry->ebx = td_conf->cpuid_config_values[idx][0] >> 32;
 	entry->ecx = (u32)td_conf->cpuid_config_values[idx][1];
@@ -174,6 +175,9 @@ static void td_init_cpuid_entry2(struct kvm_cpuid_entry2 *entry, unsigned char i

 	if (entry->index == KVM_TDX_CPUID_NO_SUBLEAF)
 		entry->index = 0;
+	else
+		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+

 	/*
 	 * The TDX module doesn't allow configuring the guest phys addr bits
--
2.53.0.414.gf7e9f6c205-goog