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Although we've implemented PSCI 0.1, 0.2 and 1.0, we expose either 0.1 or 1.0 to a guest, defaulting to the latest version of the PSCI implementation that is compatible with the requested version. This is no different from doing a firmware upgrade on KVM. But in order to give a chance to hypothetical badly implemented guests that would have a fit by discovering something other than PSCI 0.2, let's provide a new API that allows userspace to pick one particular version of the API. This is implemented as a new class of "firmware" registers, where we expose the PSCI version. This allows the PSCI version to be save/restored as part of a guest migration, and also set to any supported version if the guest requires it. Cc: stable@vger.kernel.org #4.16 Reviewed-by: Christoffer Dall <cdall@kernel.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
63 lines
2 KiB
C
63 lines
2 KiB
C
/*
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* Copyright (C) 2012,2013 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __KVM_ARM_PSCI_H__
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#define __KVM_ARM_PSCI_H__
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#include <linux/kvm_host.h>
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#include <uapi/linux/psci.h>
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#define KVM_ARM_PSCI_0_1 PSCI_VERSION(0, 1)
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#define KVM_ARM_PSCI_0_2 PSCI_VERSION(0, 2)
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#define KVM_ARM_PSCI_1_0 PSCI_VERSION(1, 0)
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#define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_0
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/*
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* We need the KVM pointer independently from the vcpu as we can call
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* this from HYP, and need to apply kern_hyp_va on it...
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*/
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static inline int kvm_psci_version(struct kvm_vcpu *vcpu, struct kvm *kvm)
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{
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/*
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* Our PSCI implementation stays the same across versions from
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* v0.2 onward, only adding the few mandatory functions (such
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* as FEATURES with 1.0) that are required by newer
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* revisions. It is thus safe to return the latest, unless
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* userspace has instructed us otherwise.
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*/
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if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) {
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if (vcpu->kvm->arch.psci_version)
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return vcpu->kvm->arch.psci_version;
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return KVM_ARM_PSCI_LATEST;
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}
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return KVM_ARM_PSCI_0_1;
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}
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int kvm_hvc_call_handler(struct kvm_vcpu *vcpu);
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struct kvm_one_reg;
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int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu);
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int kvm_arm_copy_fw_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
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int kvm_arm_get_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
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int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
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#endif /* __KVM_ARM_PSCI_H__ */
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