606 lines
16 KiB
C
606 lines
16 KiB
C
/*
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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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* Copyright IBM Corp. 2007
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* Copyright 2011 Freescale Semiconductor, Inc.
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#include <linux/jiffies.h>
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#include <linux/hrtimer.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kvm_host.h>
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#include <linux/clockchips.h>
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#include <asm/reg.h>
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#include <asm/time.h>
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#include <asm/byteorder.h>
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#include <asm/kvm_ppc.h>
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#include <asm/disassemble.h>
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#include <asm/ppc-opcode.h>
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#include "timing.h"
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#include "trace.h"
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#ifdef CONFIG_PPC_FPU
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static bool kvmppc_check_fp_disabled(struct kvm_vcpu *vcpu)
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{
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if (!(kvmppc_get_msr(vcpu) & MSR_FP)) {
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kvmppc_core_queue_fpunavail(vcpu);
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return true;
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}
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return false;
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}
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#endif /* CONFIG_PPC_FPU */
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#ifdef CONFIG_VSX
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static bool kvmppc_check_vsx_disabled(struct kvm_vcpu *vcpu)
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{
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if (!(kvmppc_get_msr(vcpu) & MSR_VSX)) {
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kvmppc_core_queue_vsx_unavail(vcpu);
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return true;
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}
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return false;
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}
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#endif /* CONFIG_VSX */
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/* XXX to do:
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* lhax
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* lhaux
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* lswx
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* lswi
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* stswx
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* stswi
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* lha
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* lhau
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* lmw
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* stmw
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*
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*/
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int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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u32 inst;
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int ra, rs, rt;
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enum emulation_result emulated;
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int advance = 1;
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/* this default type might be overwritten by subcategories */
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kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
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emulated = kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst);
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if (emulated != EMULATE_DONE)
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return emulated;
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ra = get_ra(inst);
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rs = get_rs(inst);
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rt = get_rt(inst);
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/*
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* if mmio_vsx_tx_sx_enabled == 0, copy data between
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* VSR[0..31] and memory
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* if mmio_vsx_tx_sx_enabled == 1, copy data between
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* VSR[32..63] and memory
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*/
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vcpu->arch.mmio_vsx_tx_sx_enabled = get_tx_or_sx(inst);
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vcpu->arch.mmio_vsx_copy_nums = 0;
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vcpu->arch.mmio_vsx_offset = 0;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_NONE;
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vcpu->arch.mmio_sp64_extend = 0;
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vcpu->arch.mmio_sign_extend = 0;
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switch (get_op(inst)) {
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case 31:
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switch (get_xop(inst)) {
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case OP_31_XOP_LWZX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
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break;
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case OP_31_XOP_LBZX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
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break;
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case OP_31_XOP_LBZUX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_STWX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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4, 1);
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break;
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case OP_31_XOP_STBX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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1, 1);
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break;
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case OP_31_XOP_STBUX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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1, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_LHAX:
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emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
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break;
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case OP_31_XOP_LHZX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
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break;
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case OP_31_XOP_LHZUX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_STHX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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2, 1);
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break;
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case OP_31_XOP_STHUX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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2, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_DCBST:
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case OP_31_XOP_DCBF:
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case OP_31_XOP_DCBI:
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/* Do nothing. The guest is performing dcbi because
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* hardware DMA is not snooped by the dcache, but
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* emulated DMA either goes through the dcache as
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* normal writes, or the host kernel has handled dcache
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* coherence. */
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break;
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case OP_31_XOP_LWBRX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
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break;
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case OP_31_XOP_STWBRX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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4, 0);
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break;
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case OP_31_XOP_LHBRX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
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break;
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case OP_31_XOP_STHBRX:
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emulated = kvmppc_handle_store(run, vcpu,
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kvmppc_get_gpr(vcpu, rs),
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2, 0);
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break;
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case OP_31_XOP_LDX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
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break;
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case OP_31_XOP_LDUX:
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emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_LWAX:
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emulated = kvmppc_handle_loads(run, vcpu, rt, 4, 1);
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break;
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#ifdef CONFIG_PPC_FPU
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case OP_31_XOP_LFSX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_load(run, vcpu,
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KVM_MMIO_REG_FPR|rt, 4, 1);
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break;
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case OP_31_XOP_LFSUX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_load(run, vcpu,
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KVM_MMIO_REG_FPR|rt, 4, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_LFDX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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emulated = kvmppc_handle_load(run, vcpu,
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KVM_MMIO_REG_FPR|rt, 8, 1);
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break;
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case OP_31_XOP_LFDUX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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emulated = kvmppc_handle_load(run, vcpu,
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KVM_MMIO_REG_FPR|rt, 8, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_STFSX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs), 4, 1);
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break;
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case OP_31_XOP_STFSUX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs), 4, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_STFDX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs),
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8, 1);
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break;
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case OP_31_XOP_STFDUX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs),
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8, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
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break;
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case OP_31_XOP_STFIWX:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs),
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4, 1);
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break;
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#endif
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#ifdef CONFIG_VSX
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case OP_31_XOP_LXSDX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 8, 1, 0);
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break;
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case OP_31_XOP_LXSSPX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 4, 1, 0);
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break;
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case OP_31_XOP_LXSIWAX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 4, 1, 1);
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break;
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case OP_31_XOP_LXSIWZX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 4, 1, 0);
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break;
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case OP_31_XOP_LXVD2X:
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/*
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* In this case, the official load/store process is like this:
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* Step1, exit from vm by page fault isr, then kvm save vsr.
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* Please see guest_exit_cont->store_fp_state->SAVE_32VSRS
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* as reference.
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*
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* Step2, copy data between memory and VCPU
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* Notice: for LXVD2X/STXVD2X/LXVW4X/STXVW4X, we use
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* 2copies*8bytes or 4copies*4bytes
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* to simulate one copy of 16bytes.
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* Also there is an endian issue here, we should notice the
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* layout of memory.
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* Please see MARCO of LXVD2X_ROT/STXVD2X_ROT as more reference.
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* If host is little-endian, kvm will call XXSWAPD for
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* LXVD2X_ROT/STXVD2X_ROT.
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* So, if host is little-endian,
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* the postion of memeory should be swapped.
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*
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* Step3, return to guest, kvm reset register.
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* Please see kvmppc_hv_entry->load_fp_state->REST_32VSRS
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* as reference.
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*/
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 2;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 8, 1, 0);
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break;
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case OP_31_XOP_LXVW4X:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 4;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_WORD;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 4, 1, 0);
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break;
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case OP_31_XOP_LXVDSX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type =
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KVMPPC_VSX_COPY_DWORD_LOAD_DUMP;
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emulated = kvmppc_handle_vsx_load(run, vcpu,
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KVM_MMIO_REG_VSX|rt, 8, 1, 0);
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break;
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case OP_31_XOP_STXSDX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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emulated = kvmppc_handle_vsx_store(run, vcpu,
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rs, 8, 1);
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break;
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case OP_31_XOP_STXSSPX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_vsx_store(run, vcpu,
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rs, 4, 1);
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break;
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case OP_31_XOP_STXSIWX:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_offset = 1;
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vcpu->arch.mmio_vsx_copy_nums = 1;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_WORD;
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emulated = kvmppc_handle_vsx_store(run, vcpu,
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rs, 4, 1);
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break;
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case OP_31_XOP_STXVD2X:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 2;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_DWORD;
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emulated = kvmppc_handle_vsx_store(run, vcpu,
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rs, 8, 1);
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break;
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case OP_31_XOP_STXVW4X:
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if (kvmppc_check_vsx_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_vsx_copy_nums = 4;
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vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_WORD;
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emulated = kvmppc_handle_vsx_store(run, vcpu,
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rs, 4, 1);
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break;
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#endif /* CONFIG_VSX */
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default:
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emulated = EMULATE_FAIL;
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break;
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}
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break;
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case OP_LWZ:
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emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
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break;
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#ifdef CONFIG_PPC_FPU
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case OP_STFS:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs),
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4, 1);
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break;
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case OP_STFSU:
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if (kvmppc_check_fp_disabled(vcpu))
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return EMULATE_DONE;
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vcpu->arch.mmio_sp64_extend = 1;
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emulated = kvmppc_handle_store(run, vcpu,
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VCPU_FPR(vcpu, rs),
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4, 1);
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kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_STFD:
|
|
if (kvmppc_check_fp_disabled(vcpu))
|
|
return EMULATE_DONE;
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
VCPU_FPR(vcpu, rs),
|
|
8, 1);
|
|
break;
|
|
|
|
case OP_STFDU:
|
|
if (kvmppc_check_fp_disabled(vcpu))
|
|
return EMULATE_DONE;
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
VCPU_FPR(vcpu, rs),
|
|
8, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
#endif
|
|
|
|
/* TBD: Add support for other 64 bit load variants like ldu etc. */
|
|
case OP_LD:
|
|
rt = get_rt(inst);
|
|
emulated = kvmppc_handle_load(run, vcpu, rt, 8, 1);
|
|
break;
|
|
|
|
case OP_LWZU:
|
|
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_LBZ:
|
|
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
|
|
break;
|
|
|
|
case OP_LBZU:
|
|
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_STW:
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
4, 1);
|
|
break;
|
|
|
|
/* TBD: Add support for other 64 bit store variants like stdu, stdux, stdx etc. */
|
|
case OP_STD:
|
|
rs = get_rs(inst);
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
8, 1);
|
|
break;
|
|
|
|
case OP_STWU:
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
4, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_STB:
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
1, 1);
|
|
break;
|
|
|
|
case OP_STBU:
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
1, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_LHZ:
|
|
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
|
|
break;
|
|
|
|
case OP_LHZU:
|
|
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_LHA:
|
|
emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
|
|
break;
|
|
|
|
case OP_LHAU:
|
|
emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_STH:
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
2, 1);
|
|
break;
|
|
|
|
case OP_STHU:
|
|
emulated = kvmppc_handle_store(run, vcpu,
|
|
kvmppc_get_gpr(vcpu, rs),
|
|
2, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
#ifdef CONFIG_PPC_FPU
|
|
case OP_LFS:
|
|
if (kvmppc_check_fp_disabled(vcpu))
|
|
return EMULATE_DONE;
|
|
vcpu->arch.mmio_sp64_extend = 1;
|
|
emulated = kvmppc_handle_load(run, vcpu,
|
|
KVM_MMIO_REG_FPR|rt, 4, 1);
|
|
break;
|
|
|
|
case OP_LFSU:
|
|
if (kvmppc_check_fp_disabled(vcpu))
|
|
return EMULATE_DONE;
|
|
vcpu->arch.mmio_sp64_extend = 1;
|
|
emulated = kvmppc_handle_load(run, vcpu,
|
|
KVM_MMIO_REG_FPR|rt, 4, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
|
|
case OP_LFD:
|
|
if (kvmppc_check_fp_disabled(vcpu))
|
|
return EMULATE_DONE;
|
|
emulated = kvmppc_handle_load(run, vcpu,
|
|
KVM_MMIO_REG_FPR|rt, 8, 1);
|
|
break;
|
|
|
|
case OP_LFDU:
|
|
if (kvmppc_check_fp_disabled(vcpu))
|
|
return EMULATE_DONE;
|
|
emulated = kvmppc_handle_load(run, vcpu,
|
|
KVM_MMIO_REG_FPR|rt, 8, 1);
|
|
kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
emulated = EMULATE_FAIL;
|
|
break;
|
|
}
|
|
|
|
if (emulated == EMULATE_FAIL) {
|
|
advance = 0;
|
|
kvmppc_core_queue_program(vcpu, 0);
|
|
}
|
|
|
|
trace_kvm_ppc_instr(inst, kvmppc_get_pc(vcpu), emulated);
|
|
|
|
/* Advance past emulated instruction. */
|
|
if (advance)
|
|
kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
|
|
|
|
return emulated;
|
|
}
|