mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e4e11cc0f8
This commit adds a paranoid check when entering the guest to make sure we don't attempt running guest code in an equally or more privilged mode than the hypervisor. We also catch other accidental programming of the SPSR_EL2 which results in an illegal exception return and report this safely back to the user. Signed-off-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
116 lines
3.1 KiB
C
116 lines
3.1 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 VCPU_WORKAROUND_2_FLAG_SHIFT 0
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#define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
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#define ARM_EXIT_WITH_SERROR_BIT 31
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#define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
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#define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
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#define ARM_EXCEPTION_IRQ 0
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#define ARM_EXCEPTION_EL1_SERROR 1
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#define ARM_EXCEPTION_TRAP 2
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#define ARM_EXCEPTION_IL 3
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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 HVC_STUB_ERR
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#ifndef __ASSEMBLY__
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#include <linux/mm.h>
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/* Translate a kernel address of @sym into its equivalent linear mapping */
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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 = lm_alias(&sym); \
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val; \
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})
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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 void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
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extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
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extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
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extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
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extern u64 __vgic_v3_get_ich_vtr_el2(void);
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extern u64 __vgic_v3_read_vmcr(void);
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extern void __vgic_v3_write_vmcr(u32 vmcr);
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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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/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
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#define __hyp_this_cpu_ptr(sym) \
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({ \
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void *__ptr = hyp_symbol_addr(sym); \
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__ptr += read_sysreg(tpidr_el2); \
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(typeof(&sym))__ptr; \
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})
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#define __hyp_this_cpu_read(sym) \
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({ \
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*__hyp_this_cpu_ptr(sym); \
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})
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#else /* __ASSEMBLY__ */
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.macro hyp_adr_this_cpu reg, sym, tmp
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adr_l \reg, \sym
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mrs \tmp, tpidr_el2
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add \reg, \reg, \tmp
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.endm
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.macro hyp_ldr_this_cpu reg, sym, tmp
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adr_l \reg, \sym
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mrs \tmp, tpidr_el2
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ldr \reg, [\reg, \tmp]
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.endm
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.macro get_host_ctxt reg, tmp
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hyp_adr_this_cpu \reg, kvm_host_cpu_state, \tmp
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.endm
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.macro get_vcpu_ptr vcpu, ctxt
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get_host_ctxt \ctxt, \vcpu
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ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
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kern_hyp_va \vcpu
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.endm
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#endif
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#endif /* __ARM_KVM_ASM_H__ */
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