160 lines
4.2 KiB
C
160 lines
4.2 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 __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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/* 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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extern u32 __init_stage2_translation(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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#define __KVM_EXTABLE(from, to) \
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" .pushsection __kvm_ex_table, \"a\"\n" \
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" .align 3\n" \
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" .long (" #from " - .), (" #to " - .)\n" \
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" .popsection\n"
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#define __kvm_at(at_op, addr) \
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( { \
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int __kvm_at_err = 0; \
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u64 spsr, elr; \
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asm volatile( \
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" mrs %1, spsr_el2\n" \
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" mrs %2, elr_el2\n" \
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"1: at "at_op", %3\n" \
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" isb\n" \
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" b 9f\n" \
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"2: msr spsr_el2, %1\n" \
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" msr elr_el2, %2\n" \
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" mov %w0, %4\n" \
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"9:\n" \
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__KVM_EXTABLE(1b, 2b) \
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: "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \
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: "r" (addr), "i" (-EFAULT)); \
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__kvm_at_err; \
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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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/*
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* KVM extable for unexpected exceptions.
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* In the same format _asm_extable, but output to a different section so that
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* it can be mapped to EL2. The KVM version is not sorted. The caller must
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* ensure:
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* x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented
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* code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup.
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*/
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.macro _kvm_extable, from, to
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.pushsection __kvm_ex_table, "a"
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.align 3
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.long (\from - .), (\to - .)
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.popsection
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.endm
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#endif
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#endif /* __ARM_KVM_ASM_H__ */
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