linux-kernel - [PATCH v13 098/113] KVM: TDX: Handle TDX PV map

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Message-Id: <c49aa7b7bbc016b6c8b698ac2ce3b9d866b551f9.1678643052.git.isaku.yamahata@intel.com>
Date:   Sun, 12 Mar 2023 10:57:02 -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>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>
Subject: [PATCH v13 098/113] 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 | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 0c6386fe4684..853cfda99fed 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1216,6 +1216,24 @@ static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+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;
+
+	if (!IS_ALIGNED(gpa, PAGE_SIZE) || !IS_ALIGNED(size, PAGE_SIZE) ||
+	    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;
+	}
+
+	return tdx_vp_vmcall_to_user(vcpu);
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
 	if (tdvmcall_exit_type(vcpu))
@@ -1241,6 +1259,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 		 * guest TD doesn't make sense.  No argument check is done.
 		 */
 		return tdx_vp_vmcall_to_user(vcpu);
+	case TDG_VP_VMCALL_MAP_GPA:
+		return tdx_map_gpa(vcpu);
 	default:
 		break;
 	}
-- 
2.25.1