Re: [PATCH 6/7] KVM: SVM: hyper-v: Enlightened MSR-Bitmap support

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On 07/04/21 16:41, Vineeth Pillai wrote:
+#if IS_ENABLED(CONFIG_HYPERV)
+static inline void hv_vmcb_dirty_nested_enlightenments(struct kvm_vcpu *vcpu)
+{
+	struct vmcb *vmcb = to_svm(vcpu)->vmcb;
+
+	/*
+	 * vmcb can be NULL if called during early vcpu init.
+	 * And its okay not to mark vmcb dirty during vcpu init
+	 * as we mark it dirty unconditionally towards end of vcpu
+	 * init phase.
+	 */
+	if (vmcb && vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) &&
+	    vmcb->hv_enlightenments.hv_enlightenments_control.msr_bitmap)
+		vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
+}

In addition to what Vitaly said, can svm->vmcb really be NULL? If so it might be better to reorder initializations and skip the NULL check.

Paolo




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