c94b0cf282
A later patch implements kvm_arch_hardware_disable(), to remove kvm from el2, and re-instate the hyp-stub. This can happen while guests are running, particularly when kvm_reboot() calls kvm_arch_hardware_disable() on each cpu. This can interrupt a guest, remove kvm, then allow the guest to be scheduled again. This causes kvm_call_hyp() to be run against the hyp-stub. Change the hyp-stub to return a new exception type when this happens, and add code to kvm's handle_exit() to tell userspace we failed to enter the guest. Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
64 lines
1.7 KiB
C
64 lines
1.7 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 __ARM_KVM_ASM_H__
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#define __ARM_KVM_ASM_H__
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#include <asm/virt.h>
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#define ARM_EXCEPTION_IRQ 0
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#define ARM_EXCEPTION_TRAP 1
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/* The hyp-stub will return this for any kvm_call_hyp() call */
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#define ARM_EXCEPTION_HYP_GONE 2
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#define KVM_ARM64_DEBUG_DIRTY_SHIFT 0
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#define KVM_ARM64_DEBUG_DIRTY (1 << KVM_ARM64_DEBUG_DIRTY_SHIFT)
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#define kvm_ksym_ref(sym) \
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({ \
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void *val = &sym; \
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if (!is_kernel_in_hyp_mode()) \
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val = phys_to_virt((u64)&sym - kimage_voffset); \
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val; \
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})
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#ifndef __ASSEMBLY__
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struct kvm;
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struct kvm_vcpu;
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extern char __kvm_hyp_init[];
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extern char __kvm_hyp_init_end[];
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extern char __kvm_hyp_vector[];
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extern void __kvm_flush_vm_context(void);
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extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
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extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
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extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
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extern u64 __vgic_v3_get_ich_vtr_el2(void);
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extern void __vgic_v3_init_lrs(void);
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extern u32 __kvm_get_mdcr_el2(void);
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extern void __init_stage2_translation(void);
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#endif
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#endif /* __ARM_KVM_ASM_H__ */
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