linux-kernel - [RFC PATCH v5 088/104] KVM: TDX: Add TDG.VP.VMCALL accessors to access guest vcpu registers

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Date:   Fri,  4 Mar 2022 11:49:44 -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>,
        Jim Mattson <jmattson@...gle.com>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH v5 088/104] KVM: TDX: Add TDG.VP.VMCALL accessors to access guest vcpu registers

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

TDX defines ABI for the TDX guest to call hypercall with TDG.VP.VMCALL API.
To get hypercall arguments and to set return values, add accessors to guest
vcpu registers.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/tdx.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index dc83414cb72a..8695836ce796 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -88,6 +88,41 @@ static __always_inline unsigned long tdexit_intr_info(struct kvm_vcpu *vcpu)
 	return kvm_r9_read(vcpu);
 }
 
+#define BUILD_TDVMCALL_ACCESSORS(param, gpr)					\
+static __always_inline								\
+unsigned long tdvmcall_##param##_read(struct kvm_vcpu *vcpu)			\
+{										\
+	return kvm_##gpr##_read(vcpu);						\
+}										\
+static __always_inline void tdvmcall_##param##_write(struct kvm_vcpu *vcpu,	\
+						     unsigned long val)		\
+{										\
+	kvm_##gpr##_write(vcpu, val);						\
+}
+BUILD_TDVMCALL_ACCESSORS(p1, r12);
+BUILD_TDVMCALL_ACCESSORS(p2, r13);
+BUILD_TDVMCALL_ACCESSORS(p3, r14);
+BUILD_TDVMCALL_ACCESSORS(p4, r15);
+
+static __always_inline unsigned long tdvmcall_exit_type(struct kvm_vcpu *vcpu)
+{
+	return kvm_r10_read(vcpu);
+}
+static __always_inline unsigned long tdvmcall_exit_reason(struct kvm_vcpu *vcpu)
+{
+	return kvm_r11_read(vcpu);
+}
+static __always_inline void tdvmcall_set_return_code(struct kvm_vcpu *vcpu,
+						     long val)
+{
+	kvm_r10_write(vcpu, val);
+}
+static __always_inline void tdvmcall_set_return_val(struct kvm_vcpu *vcpu,
+						    unsigned long val)
+{
+	kvm_r11_write(vcpu, val);
+}
+
 static inline bool is_td_vcpu_created(struct vcpu_tdx *tdx)
 {
 	return tdx->tdvpr.added;
-- 
2.25.1