5b3e5e5bf2
Adds a new important function in the main KVM/ARM code called handle_exit() which is called from kvm_arch_vcpu_ioctl_run() on returns from guest execution. This function examines the Hyp-Syndrome-Register (HSR), which contains information telling KVM what caused the exit from the guest. Some of the reasons for an exit are CP15 accesses, which are not allowed from the guest and this commit handles these exits by emulating the intended operation in software and skipping the guest instruction. Minor notes about the coproc register reset: 1) We reserve a value of 0 as an invalid cp15 offset, to catch bugs in our table, at cost of 4 bytes per vcpu. 2) Added comments on the table indicating how we handle each register, for simplicity of understanding. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
39 lines
1.5 KiB
C
39 lines
1.5 KiB
C
/*
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* Copyright (C) 2012 Rusty Russell IBM Corporation
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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, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __ARM_KVM_COPROC_H__
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#define __ARM_KVM_COPROC_H__
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#include <linux/kvm_host.h>
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void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
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struct kvm_coproc_target_table {
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unsigned target;
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const struct coproc_reg *table;
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size_t num;
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};
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void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table);
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int kvm_handle_cp10_id(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_handle_cp_0_13_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_handle_cp15_32(struct kvm_vcpu *vcpu, struct kvm_run *run);
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int kvm_handle_cp15_64(struct kvm_vcpu *vcpu, struct kvm_run *run);
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void kvm_coproc_table_init(void);
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#endif /* __ARM_KVM_COPROC_H__ */
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