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Message-Id: <e059d36cb674275b66746769a7079f1a50d77070.1673539699.git.isaku.yamahata@intel.com>
Date: Thu, 12 Jan 2023 08:32:45 -0800
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>,
David Matlack <dmatlack@...gle.com>
Subject: [PATCH v11 097/113] 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 5d8894899055..5dc7dae55c57 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1146,6 +1146,41 @@ 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_WRITE) ||
+ 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))
@@ -1160,6 +1195,10 @@ 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
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