[PATCH v7 078/120] KVM: x86: Use parsed CPUID(0x12)

For KVM's SGX ECREATE intercept logic, use parsed CPUID(0x12).0 and
CPUID(0x12).1 instead of issuing direct CPUID queries.

This centralizes CPUID parsing and cached access across the kernel.

Signed-off-by: Ahmed S. Darwish <[email protected]>
---
 arch/x86/kvm/vmx/sgx.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c
index 29a1f8e3be60..3f381f0f2395 100644
--- a/arch/x86/kvm/vmx/sgx.c
+++ b/arch/x86/kvm/vmx/sgx.c
@@ -440,8 +440,12 @@ void vcpu_setup_sgx_lepubkeyhash(struct kvm_vcpu *vcpu)
  */
 static bool sgx_intercept_encls_ecreate(struct kvm_vcpu *vcpu)
 {
+	const struct cpuid_regs *sl0 = cpuid_subleaf_raw(&boot_cpu_data, 0x12, 0);
+	const struct cpuid_regs *sl1 = cpuid_subleaf_raw(&boot_cpu_data, 0x12, 1);
 	struct kvm_cpuid_entry2 *guest_cpuid;
-	u32 eax, ebx, ecx, edx;
+
+	if (!sl0 || !sl1)
+		return true;
 
 	if (!vcpu->kvm->arch.sgx_provisioning_allowed)
 		return true;
@@ -450,17 +454,15 @@ static bool sgx_intercept_encls_ecreate(struct kvm_vcpu *vcpu)
 	if (!guest_cpuid)
 		return true;
 
-	cpuid_count(0x12, 0, &eax, &ebx, &ecx, &edx);
-	if (guest_cpuid->ebx != ebx || guest_cpuid->edx != edx)
+	if (guest_cpuid->ebx != sl0->ebx || guest_cpuid->edx != sl0->edx)
 		return true;
 
 	guest_cpuid = kvm_find_cpuid_entry_index(vcpu, 0x12, 1);
 	if (!guest_cpuid)
 		return true;
 
-	cpuid_count(0x12, 1, &eax, &ebx, &ecx, &edx);
-	if (guest_cpuid->eax != eax || guest_cpuid->ebx != ebx ||
-	    guest_cpuid->ecx != ecx || guest_cpuid->edx != edx)
+	if (guest_cpuid->eax != sl1->eax || guest_cpuid->ebx != sl1->ebx ||
+	    guest_cpuid->ecx != sl1->ecx || guest_cpuid->edx != sl1->edx)
 		return true;
 
 	return false;
-- 
2.54.0