linux-kernel - [PATCH v8 097/103] KVM: TDX: Handle TDX PV map

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Date:   Sun,  7 Aug 2022 15:02:22 -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 097/103] KVM: TDX: Handle TDX PV map_gpa hypercall

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

Wire up TDX PV map_gpa hypercall to the kvm/mmu backend.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/tdx.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 6131be42c721..47b3e5e591f4 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1210,6 +1210,37 @@ static int tdx_report_fatal_error(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+static int tdx_map_gpa(struct kvm_vcpu *vcpu)
+{
+	struct kvm *kvm = vcpu->kvm;
+	gpa_t gpa = tdvmcall_a0_read(vcpu);
+	gpa_t size = tdvmcall_a1_read(vcpu);
+	gpa_t end = gpa + size;
+	gfn_t s = gpa_to_gfn(gpa) & ~kvm_gfn_shared_mask(kvm);
+	gfn_t e = gpa_to_gfn(end) & ~kvm_gfn_shared_mask(kvm);
+	bool map_private = kvm_is_private_gpa(kvm, gpa);
+	int ret;
+
+	if (!IS_ALIGNED(gpa, 4096) || !IS_ALIGNED(size, 4096) ||
+	    end < gpa ||
+	    end > kvm_gfn_shared_mask(kvm) << (PAGE_SHIFT + 1) ||
+	    kvm_is_private_gpa(kvm, gpa) != kvm_is_private_gpa(kvm, end)) {
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+		return 1;
+	}
+
+	ret = kvm_mmu_map_gpa(vcpu, &s, e, map_private);
+	if (ret == -EAGAIN) {
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_RETRY);
+		tdvmcall_set_return_val(vcpu, gfn_to_gpa(s));
+	} else if (ret)
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+	else
+		tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS);
+
+	return 1;
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
 	if (tdvmcall_exit_type(vcpu))
@@ -1230,6 +1261,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 		return tdx_emulate_wrmsr(vcpu);
 	case TDG_VP_VMCALL_REPORT_FATAL_ERROR:
 		return tdx_report_fatal_error(vcpu);
+	case TDG_VP_VMCALL_MAP_GPA:
+		return tdx_map_gpa(vcpu);
 	default:
 		break;
 	}
-- 
2.25.1