linux-kernel - [PATCH 08/11] KVM: x86: Disable INIT/SIPI for TDX

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Message-Id: <20211112153733.2767561-9-xiaoyao.li@intel.com>
Date:   Fri, 12 Nov 2021 23:37:30 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     xiaoyao.li@...el.com, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        isaku.yamahata@...el.com, Kai Huang <kai.huang@...el.com>
Subject: [PATCH 08/11] KVM: x86: Disable INIT/SIPI for TDX

INIT/SIPI is not supportd for TDX guest. Disallow injecting interrupt with
delivery mode of INIT/SIPI, and add a check to reject INIT/SIPI
interrupt delivery mode.

Co-developed-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
---
 arch/x86/kvm/irq_comm.c | 2 ++
 arch/x86/kvm/x86.h      | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 705fc0dc0272..c51faa621aa4 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -130,6 +130,8 @@ static inline bool kvm_msi_route_invalid(struct kvm *kvm,
 		 msg.arch_data.is_level) ||
 		(kvm_smm_unsupported(kvm) &&
 		 msg.arch_data.delivery_mode == APIC_DELIVERY_MODE_SMI) ||
+		(kvm_init_sipi_unsupported(kvm) &&
+		 msg.arch_data.delivery_mode == APIC_DELIVERY_MODE_INIT) ||
 		(kvm->arch.x2apic_format && (msg.address_hi & 0xff));
 }
 
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index ab7c91ca2478..2203cc283e04 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -461,6 +461,11 @@ static __always_inline bool kvm_smm_unsupported(struct kvm *kvm)
 	return kvm->arch.vm_type == KVM_X86_TDX_VM;
 }
 
+static __always_inline bool kvm_init_sipi_unsupported(struct kvm *kvm)
+{
+	return kvm->arch.vm_type == KVM_X86_TDX_VM;
+}
+
 void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu);
 void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu);
 int kvm_spec_ctrl_test_value(u64 value);
-- 
2.27.0