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On ARM64 register index of 31 corresponds to both zero register and SP. However, all memory access instructions, use ZR as transfer register. SP is used only as a base register in indirect memory addressing, or by register-register arithmetics, which cannot be trapped here. Correct emulation is achieved by introducing new register accessor functions, which can do special handling for reg_num == 31. These new accessors intentionally do not rely on old vcpu_reg() on ARM64, because it is to be removed. Since the affected code is shared by both ARM flavours, implementations of these accessors are also added to ARM32 code. This patch fixes setting MMIO register to a random value (actually SP) instead of zero by something like: *((volatile int *)reg) = 0; compilers tend to generate "str wzr, [xx]" here [Marc: Fixed 32bit splat] Signed-off-by: Pavel Fedin <p.fedin@samsung.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
259 lines
6.0 KiB
C
259 lines
6.0 KiB
C
/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __ARM_KVM_EMULATE_H__
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#define __ARM_KVM_EMULATE_H__
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#include <linux/kvm_host.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_mmio.h>
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#include <asm/kvm_arm.h>
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#include <asm/cputype.h>
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unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num);
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unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu);
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static inline unsigned long vcpu_get_reg(struct kvm_vcpu *vcpu,
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u8 reg_num)
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{
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return *vcpu_reg(vcpu, reg_num);
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}
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static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
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unsigned long val)
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{
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*vcpu_reg(vcpu, reg_num) = val;
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}
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bool kvm_condition_valid(struct kvm_vcpu *vcpu);
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void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr);
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void kvm_inject_undefined(struct kvm_vcpu *vcpu);
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void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
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void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
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static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
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{
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vcpu->arch.hcr = HCR_GUEST_MASK;
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}
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static inline unsigned long vcpu_get_hcr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.hcr;
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}
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static inline void vcpu_set_hcr(struct kvm_vcpu *vcpu, unsigned long hcr)
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{
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vcpu->arch.hcr = hcr;
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}
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static inline bool vcpu_mode_is_32bit(struct kvm_vcpu *vcpu)
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{
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return 1;
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}
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static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu)
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{
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return &vcpu->arch.regs.usr_regs.ARM_pc;
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}
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static inline unsigned long *vcpu_cpsr(struct kvm_vcpu *vcpu)
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{
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return &vcpu->arch.regs.usr_regs.ARM_cpsr;
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}
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static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
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{
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*vcpu_cpsr(vcpu) |= PSR_T_BIT;
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}
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static inline bool mode_has_spsr(struct kvm_vcpu *vcpu)
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{
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unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
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return (cpsr_mode > USR_MODE && cpsr_mode < SYSTEM_MODE);
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}
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static inline bool vcpu_mode_priv(struct kvm_vcpu *vcpu)
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{
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unsigned long cpsr_mode = vcpu->arch.regs.usr_regs.ARM_cpsr & MODE_MASK;
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return cpsr_mode > USR_MODE;;
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}
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static inline u32 kvm_vcpu_get_hsr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hsr;
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}
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static inline unsigned long kvm_vcpu_get_hfar(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hxfar;
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}
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static inline phys_addr_t kvm_vcpu_get_fault_ipa(struct kvm_vcpu *vcpu)
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{
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return ((phys_addr_t)vcpu->arch.fault.hpfar & HPFAR_MASK) << 8;
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}
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static inline unsigned long kvm_vcpu_get_hyp_pc(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.fault.hyp_pc;
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}
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static inline bool kvm_vcpu_dabt_isvalid(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_ISV;
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}
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static inline bool kvm_vcpu_dabt_iswrite(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_WNR;
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}
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static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
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}
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static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
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{
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return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;
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}
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static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
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}
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static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
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}
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/* Get Access Size from a data abort */
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static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
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{
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switch ((kvm_vcpu_get_hsr(vcpu) >> 22) & 0x3) {
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case 0:
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return 1;
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case 1:
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return 2;
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case 2:
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return 4;
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default:
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kvm_err("Hardware is weird: SAS 0b11 is reserved\n");
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return -EFAULT;
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}
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}
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/* This one is not specific to Data Abort */
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static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
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}
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static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
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}
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static inline bool kvm_vcpu_trap_is_iabt(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_trap_get_class(vcpu) == HSR_EC_IABT;
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}
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static inline u8 kvm_vcpu_trap_get_fault(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_FSC;
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}
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static inline u8 kvm_vcpu_trap_get_fault_type(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_FSC_TYPE;
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}
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static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
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{
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return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
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}
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static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.cp15[c0_MPIDR] & MPIDR_HWID_BITMASK;
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}
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static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
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{
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*vcpu_cpsr(vcpu) |= PSR_E_BIT;
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}
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static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
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{
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return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
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}
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static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
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unsigned long data,
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unsigned int len)
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{
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if (kvm_vcpu_is_be(vcpu)) {
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switch (len) {
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case 1:
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return data & 0xff;
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case 2:
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return be16_to_cpu(data & 0xffff);
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default:
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return be32_to_cpu(data);
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}
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} else {
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switch (len) {
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case 1:
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return data & 0xff;
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case 2:
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return le16_to_cpu(data & 0xffff);
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default:
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return le32_to_cpu(data);
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}
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}
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}
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static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
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unsigned long data,
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unsigned int len)
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{
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if (kvm_vcpu_is_be(vcpu)) {
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switch (len) {
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case 1:
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return data & 0xff;
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case 2:
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return cpu_to_be16(data & 0xffff);
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default:
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return cpu_to_be32(data);
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}
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} else {
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switch (len) {
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case 1:
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return data & 0xff;
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case 2:
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return cpu_to_le16(data & 0xffff);
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default:
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return cpu_to_le32(data);
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}
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}
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}
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#endif /* __ARM_KVM_EMULATE_H__ */
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