2012-11-22 09:34:16 +07:00
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/*
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2014-06-27 02:11:34 +07:00
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* KVM/MIPS: Binary Patching for privileged instructions, reduces traps.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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2012-11-22 09:34:16 +07:00
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/bootmem.h>
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2014-05-29 16:16:25 +07:00
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#include <asm/cacheflush.h>
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2012-11-22 09:34:16 +07:00
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2014-06-27 02:11:38 +07:00
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#include "commpage.h"
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2012-11-22 09:34:16 +07:00
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#define SYNCI_TEMPLATE 0x041f0000
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#define SYNCI_BASE(x) (((x) >> 21) & 0x1f)
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#define SYNCI_OFFSET ((x) & 0xffff)
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#define LW_TEMPLATE 0x8c000000
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#define CLEAR_TEMPLATE 0x00000020
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#define SW_TEMPLATE 0xac000000
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2016-06-16 01:29:46 +07:00
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/**
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* kvm_mips_trans_replace() - Replace trapping instruction in guest memory.
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* @vcpu: Virtual CPU.
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* @opc: PC of instruction to replace.
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* @replace: Instruction to write
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*/
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static int kvm_mips_trans_replace(struct kvm_vcpu *vcpu, u32 *opc, u32 replace)
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{
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unsigned long kseg0_opc, flags;
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if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
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kseg0_opc =
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CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
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(vcpu, (unsigned long) opc));
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memcpy((void *)kseg0_opc, (void *)&replace, sizeof(u32));
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local_flush_icache_range(kseg0_opc, kseg0_opc + 32);
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} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
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local_irq_save(flags);
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memcpy((void *)opc, (void *)&replace, sizeof(u32));
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local_flush_icache_range((unsigned long)opc,
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(unsigned long)opc + 32);
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local_irq_restore(flags);
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} else {
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kvm_err("%s: Invalid address: %p\n", __func__, opc);
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return -EFAULT;
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}
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return 0;
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}
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2016-06-09 20:19:07 +07:00
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int kvm_mips_trans_cache_index(u32 inst, u32 *opc,
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2014-06-27 02:11:34 +07:00
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struct kvm_vcpu *vcpu)
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2012-11-22 09:34:16 +07:00
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{
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/* Replace the CACHE instruction, with a NOP */
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2016-06-16 01:29:46 +07:00
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return kvm_mips_trans_replace(vcpu, opc, 0x00000000);
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2012-11-22 09:34:16 +07:00
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}
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/*
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2014-06-27 02:11:34 +07:00
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* Address based CACHE instructions are transformed into synci(s). A little
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* heavy for just D-cache invalidates, but avoids an expensive trap
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2012-11-22 09:34:16 +07:00
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*/
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2016-06-09 20:19:07 +07:00
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int kvm_mips_trans_cache_va(u32 inst, u32 *opc,
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2014-06-27 02:11:34 +07:00
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struct kvm_vcpu *vcpu)
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2012-11-22 09:34:16 +07:00
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{
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2016-06-09 20:19:08 +07:00
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u32 synci_inst = SYNCI_TEMPLATE, base, offset;
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2012-11-22 09:34:16 +07:00
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base = (inst >> 21) & 0x1f;
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offset = inst & 0xffff;
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synci_inst |= (base << 21);
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synci_inst |= offset;
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2016-06-16 01:29:46 +07:00
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return kvm_mips_trans_replace(vcpu, opc, synci_inst);
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2012-11-22 09:34:16 +07:00
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}
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2016-06-09 20:19:07 +07:00
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int kvm_mips_trans_mfc0(u32 inst, u32 *opc, struct kvm_vcpu *vcpu)
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2012-11-22 09:34:16 +07:00
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{
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2016-06-09 20:19:08 +07:00
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u32 rt, rd, sel;
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u32 mfc0_inst;
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2012-11-22 09:34:16 +07:00
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rt = (inst >> 16) & 0x1f;
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rd = (inst >> 11) & 0x1f;
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sel = inst & 0x7;
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if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) {
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mfc0_inst = CLEAR_TEMPLATE;
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2016-06-16 01:29:45 +07:00
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mfc0_inst |= ((rt & 0x1f) << 11);
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2012-11-22 09:34:16 +07:00
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} else {
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mfc0_inst = LW_TEMPLATE;
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mfc0_inst |= ((rt & 0x1f) << 16);
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2015-12-17 06:49:31 +07:00
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mfc0_inst |= offsetof(struct kvm_mips_commpage,
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cop0.reg[rd][sel]);
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2012-11-22 09:34:16 +07:00
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}
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2016-06-16 01:29:46 +07:00
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return kvm_mips_trans_replace(vcpu, opc, mfc0_inst);
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2012-11-22 09:34:16 +07:00
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}
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2016-06-09 20:19:07 +07:00
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int kvm_mips_trans_mtc0(u32 inst, u32 *opc, struct kvm_vcpu *vcpu)
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2012-11-22 09:34:16 +07:00
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{
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2016-06-09 20:19:08 +07:00
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u32 rt, rd, sel;
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u32 mtc0_inst = SW_TEMPLATE;
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2012-11-22 09:34:16 +07:00
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rt = (inst >> 16) & 0x1f;
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rd = (inst >> 11) & 0x1f;
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sel = inst & 0x7;
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mtc0_inst |= ((rt & 0x1f) << 16);
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2015-12-17 06:49:31 +07:00
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mtc0_inst |= offsetof(struct kvm_mips_commpage, cop0.reg[rd][sel]);
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2012-11-22 09:34:16 +07:00
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2016-06-16 01:29:46 +07:00
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return kvm_mips_trans_replace(vcpu, opc, mtc0_inst);
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2012-11-22 09:34:16 +07:00
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}
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