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

Commit Message

Isaku Yamahata July 2, 2021, 10:04 p.m. UTC

From: Isaku Yamahata <[e-mail]>

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 <[e-mail]>
---
 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(-)

Patch

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);