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xen
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05/09/2024 07:14:16 AM
rwxr-xr-x
Editing: kvm_asm.h
Close
/* * Copyright (C) 2012,2013 - ARM Ltd * Author: Marc Zyngier <marc.zyngier@arm.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ARM_KVM_ASM_H__ #define __ARM_KVM_ASM_H__ #include <asm/virt.h> #define ARM_EXIT_WITH_SERROR_BIT 31 #define ARM_EXCEPTION_CODE(x) ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT)) #define ARM_SERROR_PENDING(x) !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT)) #define ARM_EXCEPTION_IRQ 0 #define ARM_EXCEPTION_EL1_SERROR 1 #define ARM_EXCEPTION_TRAP 2 /* The hyp-stub will return this for any kvm_call_hyp() call */ #define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR #define KVM_ARM64_DEBUG_DIRTY_SHIFT 0 #define KVM_ARM64_DEBUG_DIRTY (1 << KVM_ARM64_DEBUG_DIRTY_SHIFT) #define VCPU_WORKAROUND_2_FLAG_SHIFT 0 #define VCPU_WORKAROUND_2_FLAG (_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT) /* Translate a kernel address of @sym into its equivalent linear mapping */ #define kvm_ksym_ref(sym) \ ({ \ void *val = &sym; \ if (!is_kernel_in_hyp_mode()) \ val = phys_to_virt((u64)&sym - kimage_voffset); \ val; \ }) #ifndef __ASSEMBLY__ struct kvm; struct kvm_vcpu; extern char __kvm_hyp_init[]; extern char __kvm_hyp_init_end[]; extern char __kvm_hyp_vector[]; extern void __kvm_flush_vm_context(void); extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); extern void __kvm_tlb_flush_vmid(struct kvm *kvm); extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu); extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high); extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); extern u64 __vgic_v3_get_ich_vtr_el2(void); extern u64 __vgic_v3_read_vmcr(void); extern void __vgic_v3_write_vmcr(u32 vmcr); extern void __vgic_v3_init_lrs(void); extern u32 __kvm_get_mdcr_el2(void); extern u32 __init_stage2_translation(void); /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */ #define __hyp_this_cpu_ptr(sym) \ ({ \ void *__ptr = hyp_symbol_addr(sym); \ __ptr += read_sysreg(tpidr_el2); \ (typeof(&sym))__ptr; \ }) #define __hyp_this_cpu_read(sym) \ ({ \ *__hyp_this_cpu_ptr(sym); \ }) #define __KVM_EXTABLE(from, to) \ " .pushsection __kvm_ex_table, \"a\"\n" \ " .align 3\n" \ " .long (" #from " - .), (" #to " - .)\n" \ " .popsection\n" #define __kvm_at(at_op, addr) \ ( { \ int __kvm_at_err = 0; \ u64 spsr, elr; \ asm volatile( \ " mrs %1, spsr_el2\n" \ " mrs %2, elr_el2\n" \ "1: at "at_op", %3\n" \ " isb\n" \ " b 9f\n" \ "2: msr spsr_el2, %1\n" \ " msr elr_el2, %2\n" \ " mov %w0, %4\n" \ "9:\n" \ __KVM_EXTABLE(1b, 2b) \ : "+r" (__kvm_at_err), "=&r" (spsr), "=&r" (elr) \ : "r" (addr), "i" (-EFAULT)); \ __kvm_at_err; \ } ) #else /* __ASSEMBLY__ */ .macro hyp_adr_this_cpu reg, sym, tmp adr_l \reg, \sym mrs \tmp, tpidr_el2 add \reg, \reg, \tmp .endm .macro hyp_ldr_this_cpu reg, sym, tmp adr_l \reg, \sym mrs \tmp, tpidr_el2 ldr \reg, [\reg, \tmp] .endm .macro get_host_ctxt reg, tmp hyp_adr_this_cpu \reg, kvm_host_cpu_state, \tmp .endm .macro get_vcpu_ptr vcpu, ctxt get_host_ctxt \ctxt, \vcpu ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU] kern_hyp_va \vcpu .endm /* * KVM extable for unexpected exceptions. * In the same format _asm_extable, but output to a different section so that * it can be mapped to EL2. The KVM version is not sorted. The caller must * ensure: * x18 has the hypervisor value to allow any Shadow-Call-Stack instrumented * code to write to it, and that SPSR_EL2 and ELR_EL2 are restored by the fixup. */ .macro _kvm_extable, from, to .pushsection __kvm_ex_table, "a" .align 3 .long (\from - .), (\to - .) .popsection .endm #endif #endif /* __ARM_KVM_ASM_H__ */