linux-kernel - [PATCH v8 095/103] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall

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Message-Id: <ce183d47a93012c46472b32077e80dc8b56c88ed.1659854791.git.isaku.yamahata@intel.com>
Date:   Sun,  7 Aug 2022 15:02:20 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>
Subject: [PATCH v8 095/103] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall

From: Isaku Yamahata <isaku.yamahata@...el.com>

Wire up TDX PV rdmsr/wrmsr hypercall to the KVM backend function.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx/tdx.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 341c29385544..fdd0609bd01b 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1157,6 +1157,41 @@ static int tdx_emulate_mmio(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+static int tdx_emulate_rdmsr(struct kvm_vcpu *vcpu)
+{
+	u32 index = tdvmcall_a0_read(vcpu);
+	u64 data;
+
+	if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ) ||
+	    kvm_get_msr(vcpu, index, &data)) {
+		trace_kvm_msr_read_ex(index);
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+		return 1;
+	}
+	trace_kvm_msr_read(index, data);
+
+	tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
+	tdvmcall_set_return_val(vcpu, data);
+	return 1;
+}
+
+static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
+{
+	u32 index = tdvmcall_a0_read(vcpu);
+	u64 data = tdvmcall_a1_read(vcpu);
+
+	if (!kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ) ||
+	    kvm_set_msr(vcpu, index, data)) {
+		trace_kvm_msr_write_ex(index, data);
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+		return 1;
+	}
+
+	trace_kvm_msr_write(index, data);
+	tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
+	return 1;
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
 	if (tdvmcall_exit_type(vcpu))
@@ -1171,6 +1206,10 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 		return tdx_emulate_io(vcpu);
 	case EXIT_REASON_EPT_VIOLATION:
 		return tdx_emulate_mmio(vcpu);
+	case EXIT_REASON_MSR_READ:
+		return tdx_emulate_rdmsr(vcpu);
+	case EXIT_REASON_MSR_WRITE:
+		return tdx_emulate_wrmsr(vcpu);
 	default:
 		break;
 	}
-- 
2.25.1