1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2012,2013 - ARM Ltd
6  * Derived from arch/arm/kvm/reset.c
7  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
37  * ARMv8 Reset Values
65 		 * Don't even try to make use of vector lengths that  in kvm_arm_init_sve()
79 		return -EINVAL;  in kvm_vcpu_enable_sve()
81 	vcpu->arch.sve_max_vl = kvm_sve_max_vl;  in kvm_vcpu_enable_sve()
95  * vcpu->arch.sve_state as necessary.
104 	vl = vcpu->arch.sve_max_vl;  in kvm_vcpu_finalize_sve()
109 	 * set_sve_vls().  Double-check here just to be sure:  in kvm_vcpu_finalize_sve()
113 		return -EIO;  in kvm_vcpu_finalize_sve()
118 		return -ENOMEM;  in kvm_vcpu_finalize_sve()
126 	vcpu->arch.sve_state = buf;  in kvm_vcpu_finalize_sve()
136 			return -EINVAL;  in kvm_arm_vcpu_finalize()
139 			return -EPERM;  in kvm_arm_vcpu_finalize()
144 	return -EINVAL;  in kvm_arm_vcpu_finalize()
157 	void *sve_state = vcpu->arch.sve_state;  in kvm_arm_vcpu_destroy()
164 	kfree(vcpu->arch.ccsidr);  in kvm_arm_vcpu_destroy()
170 		memset(vcpu->arch.sve_state, 0, vcpu_sve_state_size(vcpu));  in kvm_vcpu_reset_sve()
180 	if (!test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||  in kvm_vcpu_enable_ptrauth()
181 	    !test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features) ||  in kvm_vcpu_enable_ptrauth()
183 		return -EINVAL;  in kvm_vcpu_enable_ptrauth()
190  * kvm_reset_vcpu - sets core registers and sys_regs to reset value
194  * architecturally defined reset values, except for registers whose reset is
198  * ioctl or as part of handling a request issued by another VCPU in the PSCI
201  * on the memory-backed values of system registers, we want to do a full put if
202  * we were loaded (handling a request) and load the values back at the end of
204  * disable preemption around the vcpu reset as we would otherwise race with
214 	spin_lock(&vcpu->arch.mp_state_lock);  in kvm_reset_vcpu()
215 	reset_state = vcpu->arch.reset_state;  in kvm_reset_vcpu()
216 	vcpu->arch.reset_state.reset = false;  in kvm_reset_vcpu()
217 	spin_unlock(&vcpu->arch.mp_state_lock);  in kvm_reset_vcpu()
219 	/* Reset PMU outside of the non-preemptible section */  in kvm_reset_vcpu()
223 	loaded = (vcpu->cpu != -1);  in kvm_reset_vcpu()
229 		ret = -EINVAL;  in kvm_reset_vcpu()
230 		goto out;  in kvm_reset_vcpu()
234 		if (test_bit(KVM_ARM_VCPU_SVE, vcpu->arch.features)) {  in kvm_reset_vcpu()
237 				goto out;  in kvm_reset_vcpu()
243 	if (test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, vcpu->arch.features) ||  in kvm_reset_vcpu()
244 	    test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, vcpu->arch.features)) {  in kvm_reset_vcpu()
246 			ret = -EINVAL;  in kvm_reset_vcpu()
247 			goto out;  in kvm_reset_vcpu()
259 		ret = -EINVAL;  in kvm_reset_vcpu()
260 		goto out;  in kvm_reset_vcpu()
263 	/* Reset core registers */  in kvm_reset_vcpu()
265 	memset(&vcpu->arch.ctxt.fp_regs, 0, sizeof(vcpu->arch.ctxt.fp_regs));  in kvm_reset_vcpu()
266 	vcpu->arch.ctxt.spsr_abt = 0;  in kvm_reset_vcpu()
267 	vcpu->arch.ctxt.spsr_und = 0;  in kvm_reset_vcpu()
268 	vcpu->arch.ctxt.spsr_irq = 0;  in kvm_reset_vcpu()
269 	vcpu->arch.ctxt.spsr_fiq = 0;  in kvm_reset_vcpu()
270 	vcpu_gp_regs(vcpu)->pstate = pstate;  in kvm_reset_vcpu()
272 	/* Reset system registers */  in kvm_reset_vcpu()
276 	 * Additional reset state handling that PSCI may have imposed on us.  in kvm_reset_vcpu()
277 	 * Must be done after all the sys_reg reset.  in kvm_reset_vcpu()
279 	if (reset_state.reset) {  in kvm_reset_vcpu()
296 	/* Reset timer */  in kvm_reset_vcpu()
298 out:  in kvm_reset_vcpu()
328 	 * Check with ARMv8.5-GTG that our PAGE_SIZE is supported at  in kvm_set_ipa_limit()
329 	 * Stage-2. If not, things will stop very quickly.  in kvm_set_ipa_limit()
333 		kvm_err("PAGE_SIZE not supported at Stage-2, giving up\n");  in kvm_set_ipa_limit()
334 		return -EINVAL;  in kvm_set_ipa_limit()
336 		kvm_debug("PAGE_SIZE supported at Stage-2 (default)\n");  in kvm_set_ipa_limit()
339 		kvm_debug("PAGE_SIZE supported at Stage-2 (advertised)\n");  in kvm_set_ipa_limit()
343 		return -EINVAL;  in kvm_set_ipa_limit()