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Subject[RFC PATCH v6 090/104] KVM: TDX: Handle TDX PV CPUID hypercall
Date
From: Isaku Yamahata <isaku.yamahata@intel.com>

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

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/vmx/tdx.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 9c712f661a7c..c7cdfee397ec 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -946,12 +946,34 @@ static int tdx_emulate_vmcall(struct kvm_vcpu *vcpu)
return 1;
}

+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, true);
+
+ 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, TDG_VP_VMCALL_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;
}
--
2.25.1
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