linux-kernel - [RFC PATCH v2 31/69] KVM: x86: add per-VM flags to disable SMI/INIT/SIPI

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Message-Id: <f0d016794615a513e242bb059494623eb55606eb.1625186503.git.isaku.yamahata@intel.com>
Date:   Fri,  2 Jul 2021 15:04:37 -0700
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>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com
Subject: [RFC PATCH v2 31/69] KVM: x86: add per-VM flags to disable SMI/INIT/SIPI

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

Add a flag to let TDX disallow to inject interrupt with delivery
mode of SMI/INIT/SIPI. add a check to reject SMI/INIT interrupt
delivery mode.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/include/asm/kvm_host.h | 2 ++
 arch/x86/kvm/irq_comm.c         | 4 ++++
 arch/x86/kvm/x86.c              | 3 +--
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f373d672b4ac..00333af724d7 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1055,6 +1055,8 @@ struct kvm_arch {
 	enum kvm_irqchip_mode irqchip_mode;
 	u8 nr_reserved_ioapic_pins;
 	bool eoi_intercept_unsupported;
+	bool smm_unsupported;
+	bool init_sipi_unsupported;
 
 	bool disabled_lapic_found;
 
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index bcfac99db579..396ccf086bdd 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -128,6 +128,10 @@ static inline bool kvm_msi_route_invalid(struct kvm *kvm,
 			       .data = e->msi.data };
 	return  (kvm->arch.eoi_intercept_unsupported &&
 		 msg.arch_data.is_level) ||
+		(kvm->arch.smm_unsupported &&
+		 msg.arch_data.delivery_mode == APIC_DELIVERY_MODE_SMI) ||
+		(kvm->arch.init_sipi_unsupported &&
+		 msg.arch_data.delivery_mode == APIC_DELIVERY_MODE_INIT) ||
 		(kvm->arch.x2apic_format && (msg.address_hi & 0xff));
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 92204bbc7ea5..3407870b6f44 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4311,8 +4311,7 @@ static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
 
 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu)
 {
-	/* TODO: use more precise flag */
-	if (vcpu->arch.guest_state_protected)
+	if (vcpu->kvm->arch.smm_unsupported)
 		return -EINVAL;
 
 	kvm_make_request(KVM_REQ_SMI, vcpu);
-- 
2.25.1