Re: [PATCH v7 08/12] KVM: arm64: PMU: Allow userspace to limit PMCR_EL0.N for the guest

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, 9 Oct 2023, Raghavendra Rao Ananta wrote:
+static int set_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r,
+		    u64 val)
+{
+	struct kvm *kvm = vcpu->kvm;
+	u64 new_n, mutable_mask;
+
+	mutex_lock(&kvm->arch.config_lock);
+
+	/*
+	 * Make PMCR immutable once the VM has started running, but do
+	 * not return an error (-EBUSY) to meet the existing expectations.
+	 */

Why should we mention which error we're _not_ returning?


+	if (kvm_vm_has_ran_once(vcpu->kvm)) {
+		mutex_unlock(&kvm->arch.config_lock);
+		return 0;
+	}




[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux