linux-kernel - [RFC PATCH v6 026/104] KVM: TDX: Make KVM_CAP_SET_IDENTITY_MAP

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Date:   Thu,  5 May 2022 11:14:20 -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: [RFC PATCH v6 026/104] KVM: TDX: Make KVM_CAP_SET_IDENTITY_MAP_ADDR unsupported for TDX

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

Because TDX doesn't support KVM_SET_IDENTITY_MAP_ADDR.  Return
KVM_CAP_SET_IDENTITY_MAP_ADDR as unsupported.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/x86.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 77e83e20180a..fd282e5efec1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4236,7 +4236,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_IOEVENTFD_NO_LENGTH:
 	case KVM_CAP_PIT2:
 	case KVM_CAP_PIT_STATE2:
-	case KVM_CAP_SET_IDENTITY_MAP_ADDR:
 	case KVM_CAP_VCPU_EVENTS:
 	case KVM_CAP_HYPERV:
 	case KVM_CAP_HYPERV_VAPIC:
@@ -4389,6 +4388,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_DISABLE_QUIRKS2:
 		r = KVM_X86_VALID_QUIRKS;
 		break;
+	case KVM_CAP_SET_IDENTITY_MAP_ADDR:
+		if (kvm && kvm->arch.vm_type == KVM_X86_TDX_VM)
+			r = 0;
+		else
+			r = 1;
+		break;
 	case KVM_CAP_VM_TYPES:
 		r = BIT(KVM_X86_DEFAULT_VM);
 		if (static_call(kvm_x86_is_vm_type_supported)(KVM_X86_TDX_VM))
-- 
2.25.1