linux-kernel - [RFC PATCH 27/67] KVM: x86: Add support for vCPU and device-scoped KVM_MEMORY_ENCRYPT

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Message-Id: <69f91c5f7625f3e63e15bba4de17ac3765853071.1605232743.git.isaku.yamahata@intel.com>
Date:   Mon, 16 Nov 2020 10:26:12 -0800
From:   isaku.yamahata@...el.com
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [RFC PATCH 27/67] KVM: x86: Add support for vCPU and device-scoped KVM_MEMORY_ENCRYPT_OP

From: Sean Christopherson <sean.j.christopherson@...el.com>

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/include/asm/kvm_host.h |  2 ++
 arch/x86/kvm/x86.c              | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 01c78eeefef4..32e995327944 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1276,7 +1276,9 @@ struct kvm_x86_ops {
 	int (*pre_leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
 	void (*enable_smi_window)(struct kvm_vcpu *vcpu);
 
+	int (*mem_enc_op_dev)(void __user *argp);
 	int (*mem_enc_op)(struct kvm *kvm, void __user *argp);
+	int (*mem_enc_op_vcpu)(struct kvm_vcpu *vcpu, void __user *argp);
 	int (*mem_enc_reg_region)(struct kvm *kvm, struct kvm_enc_region *argp);
 	int (*mem_enc_unreg_region)(struct kvm *kvm, struct kvm_enc_region *argp);
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 22e956f01ddc..7b8bbdc98492 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3882,6 +3882,12 @@ long kvm_arch_dev_ioctl(struct file *filp,
 	case KVM_GET_MSRS:
 		r = msr_io(NULL, argp, do_get_msr_feature, 1);
 		break;
+	case KVM_MEMORY_ENCRYPT_OP:
+		r = -EINVAL;
+		if (!kvm_x86_ops.mem_enc_op_dev)
+			goto out;
+		r = kvm_x86_ops.mem_enc_op_dev(argp);
+		break;
 	default:
 		r = -EINVAL;
 		break;
@@ -5020,6 +5026,12 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 		r = 0;
 		break;
 	}
+	case KVM_MEMORY_ENCRYPT_OP:
+		r = -EINVAL;
+		if (!kvm_x86_ops.mem_enc_op_vcpu)
+			goto out;
+		r = kvm_x86_ops.mem_enc_op_vcpu(vcpu, argp);
+		break;
 	default:
 		r = -EINVAL;
 	}
-- 
2.17.1