KVM: SVM: Allocate IR data using atomic allocation

Allocate SVM's interrupt remapping metadata using GFP_ATOMIC as
svm_ir_list_add() is called with IRQs are disabled and irqfs.lock held
when kvm_irq_routing_update() reacts to GSI routing changes.

Fixes: 411b44b ("svm: Implements update_pi_irte hook to setup posted interrupt")
Cc: [email protected]
Signed-off-by: Sean Christopherson <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: sean-jc

arch/x86/kvm/svm/avic.c

@@ -820,7 +820,7 @@ static int svm_ir_list_add(struct vcpu_svm *svm, struct amd_iommu_pi_data *pi)
 	 * Allocating new amd_iommu_pi_data, which will get
 	 * add to the per-vcpu ir_list.
 	 */
-	ir = kzalloc(sizeof(struct amd_svm_iommu_ir), GFP_KERNEL_ACCOUNT);
+	ir = kzalloc(sizeof(struct amd_svm_iommu_ir), GFP_ATOMIC | __GFP_ACCOUNT);
 	if (!ir) {
 		ret = -ENOMEM;
 		goto out;