[v19,107/130] KVM: TDX: Handle TDX PV CPUID hypercall

Commit Message

Isaku Yamahata Feb. 26, 2024, 8:26 a.m. UTC

From: Isaku Yamahata <[e-mail]>

Wire up TDX PV CPUID hypercall to the KVM backend function.

Signed-off-by: Isaku Yamahata <[e-mail]>
---
 arch/x86/kvm/vmx/tdx.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

Patch

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 72dbe2ff9062..eb68d6c148b6 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1110,12 +1110,34 @@  static int tdx_vp_vmcall_to_user(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+static int tdx_emulate_cpuid(struct kvm_vcpu *vcpu)
+{
+	u32 eax, ebx, ecx, edx;
+
+	/* EAX and ECX for cpuid is stored in R12 and R13. */
+	eax = tdvmcall_a0_read(vcpu);
+	ecx = tdvmcall_a1_read(vcpu);
+
+	kvm_cpuid(vcpu, &eax, &ebx, &ecx, &edx, false);
+
+	tdvmcall_a0_write(vcpu, eax);
+	tdvmcall_a1_write(vcpu, ebx);
+	tdvmcall_a2_write(vcpu, ecx);
+	tdvmcall_a3_write(vcpu, edx);
+
+	tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS);
+
+	return 1;
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
 	if (tdvmcall_exit_type(vcpu))
 		return tdx_emulate_vmcall(vcpu);
 
 	switch (tdvmcall_leaf(vcpu)) {
+	case EXIT_REASON_CPUID:
+		return tdx_emulate_cpuid(vcpu);
 	default:
 		break;
 	}