163 lines
5.8 KiB
C
163 lines
5.8 KiB
C
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/*
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* Copyright (C) 2015 - 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 __ARM64_KVM_HYP_H__
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#define __ARM64_KVM_HYP_H__
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_mmu.h>
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#include <asm/sysreg.h>
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#define __hyp_text __section(.hyp.text) notrace
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#define read_sysreg_elx(r,nvh,vh) \
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({ \
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u64 reg; \
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asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
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DEFINE_MRS_S \
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"mrs_s %0, " __stringify(r##vh) "\n"\
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UNDEFINE_MRS_S, \
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ARM64_HAS_VIRT_HOST_EXTN) \
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: "=r" (reg)); \
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reg; \
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})
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#define write_sysreg_elx(v,r,nvh,vh) \
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do { \
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u64 __val = (u64)(v); \
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asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
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DEFINE_MSR_S \
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"msr_s " __stringify(r##vh) ", %x0\n"\
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UNDEFINE_MSR_S, \
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ARM64_HAS_VIRT_HOST_EXTN) \
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: : "rZ" (__val)); \
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} while (0)
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/*
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* Unified accessors for registers that have a different encoding
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* between VHE and non-VHE. They must be specified without their "ELx"
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* encoding.
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*/
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#define read_sysreg_el2(r) \
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({ \
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u64 reg; \
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asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
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"mrs %0, " __stringify(r##_EL1),\
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ARM64_HAS_VIRT_HOST_EXTN) \
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: "=r" (reg)); \
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reg; \
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})
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#define write_sysreg_el2(v,r) \
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do { \
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u64 __val = (u64)(v); \
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asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
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"msr " __stringify(r##_EL1) ", %x0",\
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ARM64_HAS_VIRT_HOST_EXTN) \
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: : "rZ" (__val)); \
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} while (0)
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#define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02)
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#define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02)
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#define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12)
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#define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
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/* The VHE specific system registers and their encoding */
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#define sctlr_EL12 sys_reg(3, 5, 1, 0, 0)
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#define cpacr_EL12 sys_reg(3, 5, 1, 0, 2)
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#define ttbr0_EL12 sys_reg(3, 5, 2, 0, 0)
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#define ttbr1_EL12 sys_reg(3, 5, 2, 0, 1)
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#define tcr_EL12 sys_reg(3, 5, 2, 0, 2)
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#define afsr0_EL12 sys_reg(3, 5, 5, 1, 0)
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#define afsr1_EL12 sys_reg(3, 5, 5, 1, 1)
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#define esr_EL12 sys_reg(3, 5, 5, 2, 0)
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#define far_EL12 sys_reg(3, 5, 6, 0, 0)
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#define mair_EL12 sys_reg(3, 5, 10, 2, 0)
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#define amair_EL12 sys_reg(3, 5, 10, 3, 0)
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#define vbar_EL12 sys_reg(3, 5, 12, 0, 0)
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#define contextidr_EL12 sys_reg(3, 5, 13, 0, 1)
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#define cntkctl_EL12 sys_reg(3, 5, 14, 1, 0)
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#define cntp_tval_EL02 sys_reg(3, 5, 14, 2, 0)
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#define cntp_ctl_EL02 sys_reg(3, 5, 14, 2, 1)
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#define cntp_cval_EL02 sys_reg(3, 5, 14, 2, 2)
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#define cntv_tval_EL02 sys_reg(3, 5, 14, 3, 0)
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#define cntv_ctl_EL02 sys_reg(3, 5, 14, 3, 1)
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#define cntv_cval_EL02 sys_reg(3, 5, 14, 3, 2)
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#define spsr_EL12 sys_reg(3, 5, 4, 0, 0)
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#define elr_EL12 sys_reg(3, 5, 4, 0, 1)
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/**
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* hyp_alternate_select - Generates patchable code sequences that are
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* used to switch between two implementations of a function, depending
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* on the availability of a feature.
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*
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* @fname: a symbol name that will be defined as a function returning a
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* function pointer whose type will match @orig and @alt
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* @orig: A pointer to the default function, as returned by @fname when
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* @cond doesn't hold
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* @alt: A pointer to the alternate function, as returned by @fname
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* when @cond holds
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* @cond: a CPU feature (as described in asm/cpufeature.h)
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*/
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#define hyp_alternate_select(fname, orig, alt, cond) \
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typeof(orig) * __hyp_text fname(void) \
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{ \
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typeof(alt) *val = orig; \
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asm volatile(ALTERNATIVE("nop \n", \
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"mov %0, %1 \n", \
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cond) \
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: "+r" (val) : "r" (alt)); \
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return val; \
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}
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void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
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void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
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int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
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void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
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void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
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void __timer_save_state(struct kvm_vcpu *vcpu);
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void __timer_restore_state(struct kvm_vcpu *vcpu);
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void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
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void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
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void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
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void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
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void __sysreg32_save_state(struct kvm_vcpu *vcpu);
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void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
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void __debug_save_state(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug_arch *dbg,
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struct kvm_cpu_context *ctxt);
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void __debug_restore_state(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug_arch *dbg,
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struct kvm_cpu_context *ctxt);
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void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
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void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
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void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
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void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
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bool __fpsimd_enabled(void);
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u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
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void __noreturn __hyp_do_panic(unsigned long, ...);
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#endif /* __ARM64_KVM_HYP_H__ */
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