X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_ctrl_regs.c;h=ba83f3b6010c448e05ab963edd4dbc31cc5d27b3;hb=07820ee58e9b356341ce86cd2b2938d3abef60c9;hp=a05957370c5d6079116915ed504fa94687dda51e;hpb=526ffdd06c1afb982d0d9831b99f337b6a094960;p=palacios.git diff --git a/palacios/src/palacios/vmm_ctrl_regs.c b/palacios/src/palacios/vmm_ctrl_regs.c index a059573..ba83f3b 100644 --- a/palacios/src/palacios/vmm_ctrl_regs.c +++ b/palacios/src/palacios/vmm_ctrl_regs.c @@ -7,9 +7,6 @@ -extern void SerialMemDump(unsigned char *start, int n); - - /* Segmentation is a problem here... * * When we get a memory operand, presumably we use the default segment (which is?) @@ -17,461 +14,120 @@ extern void SerialMemDump(unsigned char *start, int n); */ -int handle_cr0_write(struct guest_info * info) { - char instr[15]; - - - switch (info->cpu_mode) { - case REAL: - { - int index = 0; - int ret; - - PrintDebug("Real Mode write to CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs))); - - PrintV3Segments(&(info->segments)); - - // The real rip address is actually a combination of the rip + CS base - ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - if (ret != 15) { - // I think we should inject a GPF into the guest - PrintDebug("Could not read instruction (ret=%d)\n", ret); - return -1; - } - - while (is_prefix_byte(instr[index])) { - switch(instr[index]) { - case PREFIX_CS_OVERRIDE: - case PREFIX_SS_OVERRIDE: - case PREFIX_DS_OVERRIDE: - case PREFIX_ES_OVERRIDE: - case PREFIX_FS_OVERRIDE: - case PREFIX_GS_OVERRIDE: - PrintDebug("Segment Override!!\n"); - return -1; - break; - default: - break; - } - index++; - } +#ifndef DEBUG_CTRL_REGS +#undef PrintDebug +#define PrintDebug(fmt, args...) +#endif - if ((instr[index] == cr_access_byte) && - (instr[index + 1] == lmsw_byte) && - (MODRM_REG(instr[index + 2]) == lmsw_reg_byte)) { - - addr_t first_operand; - addr_t second_operand; - struct cr0_real *real_cr0; - struct cr0_real *new_cr0; - operand_type_t addr_type; - char new_cr0_val = 0; - // LMSW - // decode mod/RM - index += 2; - - real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16); - if (addr_type == REG_OPERAND) { - new_cr0 = (struct cr0_real *)first_operand; - } else if (addr_type == MEM_OPERAND) { - addr_t host_addr; - if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) { - // gpf the guest - return -1; - } - new_cr0 = (struct cr0_real *)host_addr; - } else { - // error... don't know what to do - return -1; - } - - if ((new_cr0->pe == 1) && (real_cr0->pe == 0)) { - info->cpu_mode = PROTECTED; - } else if ((new_cr0->pe == 0) && (real_cr0->pe == 1)) { - info->cpu_mode = REAL; - } - - new_cr0_val = (*(char*)(new_cr0)) & 0x0f; +int handle_cr0_write(struct guest_info * info) { + char instr[15]; + int ret; + struct x86_instr dec_instr; + if (info->mem_mode == PHYSICAL_MEM) { + ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } else { + ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); + } - if (info->shdw_pg_mode == SHADOW_PAGING) { - struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); - - PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - /* struct cr0_real is only 4 bits wide, - * so we can overwrite the real_cr0 without worrying about the shadow fields - */ - *(char*)real_cr0 &= 0xf0; - *(char*)real_cr0 |= new_cr0_val; - - *(char*)shadow_cr0 &= 0xf0; - *(char*)shadow_cr0 |= new_cr0_val; + if (ret != 15) { + // I think we should inject a GPF into the guest + PrintError("Could not read instruction (ret=%d)\n", ret); + return -1; + } + if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) { + PrintError("Could not decode instruction\n"); + return -1; + } - PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - } else { - PrintDebug("Old CR0=%x\n", *real_cr0); - // for now we just pass through.... - *(char*)real_cr0 &= 0xf0; - *(char*)real_cr0 |= new_cr0_val; - PrintDebug("New CR0=%x\n", *real_cr0); - } + if (opcode_cmp(V3_OPCODE_LMSW, (const uchar_t *)(dec_instr.opcode)) == 0) { + struct cr0_real *real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); + struct cr0_real *new_cr0 = (struct cr0_real *)(dec_instr.first_operand.operand); + uchar_t new_cr0_val; + PrintDebug("LMSW\n"); - info->rip += index; - - } else if ((instr[index] == cr_access_byte) && - (instr[index + 1] == clts_byte)) { - // CLTS - PrintDebug("CLTS unhandled in CR0 write\n"); - return -1; + new_cr0_val = (*(char*)(new_cr0)) & 0x0f; + + PrintDebug("OperandVal = %x\n", new_cr0_val); - } else if ((instr[index] == cr_access_byte) && - (instr[index + 1] = mov_to_cr_byte)) { - addr_t first_operand; - addr_t second_operand; - struct cr0_32 *real_cr0; - struct cr0_32 *new_cr0; - operand_type_t addr_type; - + PrintDebug("Old CR0=%x\n", *real_cr0); + *(uchar_t*)real_cr0 &= 0xf0; + *(uchar_t*)real_cr0 |= new_cr0_val; + PrintDebug("New CR0=%x\n", *real_cr0); - index += 2; - - real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - if (addr_type != REG_OPERAND) { - PrintDebug("Moving to CR0 from non-register operand in CR0 write\n"); - /* Mov to CR0 Can only be a 32 bit register */ - // FIX ME - return -1; - } - - new_cr0 = (struct cr0_32 *)first_operand; - - if (new_cr0->pe == 1) { - PrintDebug("Entering Protected Mode\n"); - info->cpu_mode = PROTECTED; - } - if (new_cr0->pe == 0) { - PrintDebug("Entering Real Mode\n"); - info->cpu_mode = REAL; - } - - - - if ((new_cr0->pg == 1) && (new_cr0->pe == 1)) { - PrintDebug("Paging is already turned on in switch to protected mode in CR0 write\n"); - - // Actually This appears to be Ok. - // Why shouldn't windows be allowed to switch to real mode whenever it wants to modify its page tables? - - info->mem_mode = VIRTUAL_MEM; - - // GPF the guest?? - // return -1; - } else if ((new_cr0->pg == 1) && (new_cr0->pe == 0)) { - PrintDebug("Will the madness Never End??\n"); - return -1; - } - - - if (info->shdw_pg_mode == SHADOW_PAGING) { - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - - PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - *real_cr0 = *new_cr0; - real_cr0->pg = 1; - real_cr0->et = 1; - - *shadow_cr0 = *new_cr0; - shadow_cr0->et = 1; - - // Setup the page tables...??? - if (info->mem_mode == VIRTUAL_MEM) { - // If we aren't in paged mode then we have to preserve the identity mapped CR3 - info->ctrl_regs.cr3 = *(addr_t*)&(info->shdw_pg_state.shadow_cr3); - } - - PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - } else { - PrintDebug("Old CR0=%x\n", *real_cr0); - *real_cr0 = *new_cr0; - PrintDebug("New CR0=%x\n", *real_cr0); - } - - info->rip += index; - - } else { - PrintDebug("Unsupported Instruction\n"); - // unsupported instruction, UD the guest - return -1; - } + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); + + PrintDebug(" Old Shadow CR0=%x\n", *shadow_cr0); + *(uchar_t*)shadow_cr0 &= 0xf0; + *(uchar_t*)shadow_cr0 |= new_cr0_val; + PrintDebug("New Shadow CR0=%x\n", *shadow_cr0); + } + } else if (opcode_cmp(V3_OPCODE_MOV2CR, (const uchar_t *)(dec_instr.opcode)) == 0) { + PrintDebug("MOV2CR0\n"); - } - break; - - case PROTECTED: - { + if (info->cpu_mode == LONG) { + // 64 bit registers + } else { + // 32 bit registers + struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); + struct cr0_32 *new_cr0= (struct cr0_32 *)(dec_instr.second_operand.operand); - int index = 0; - int ret; + PrintDebug("OperandVal = %x, length=%d\n", *new_cr0, dec_instr.first_operand.size); - PrintDebug("Protected %s Mode write to CR0 at guest %s linear rip 0x%x\n", - info->mem_mode == VIRTUAL_MEM ? "Paged" : "", - info->mem_mode == VIRTUAL_MEM ? "virtual" : "", - get_addr_linear(info, info->rip, &(info->segments.cs))); - // OK, now we will read the instruction - // The only difference between PROTECTED and PROTECTED_PG is whether we read - // from guest_pa or guest_va - if (info->mem_mode == PHYSICAL_MEM) { - // The real rip address is actually a combination of the rip + CS base - ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - } else { - ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - } + PrintDebug("Old CR0=%x\n", *real_cr0); + *real_cr0 = *new_cr0; - if (ret != 15) { - // I think we should inject a GPF into the guest - PrintDebug("Could not read instruction (ret=%d)\n", ret); - return -1; - } - - - while (is_prefix_byte(instr[index])) { - switch(instr[index]) { - case PREFIX_CS_OVERRIDE: - case PREFIX_SS_OVERRIDE: - case PREFIX_DS_OVERRIDE: - case PREFIX_ES_OVERRIDE: - case PREFIX_FS_OVERRIDE: - case PREFIX_GS_OVERRIDE: - PrintDebug("Segment Override!!\n"); - return -1; - break; - default: - break; - } - index++; - } - - /* - while (is_prefix_byte(instr[index])) { - index++; - } - */ - - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - - struct cr0_32 * real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); - - if ((instr[index] == cr_access_byte) && - (instr[index + 1] == mov_to_cr_byte)) { - - // MOV to CR0 - - addr_t first_operand; - addr_t second_operand; - struct cr0_32 *new_cr0; - operand_type_t addr_type; - - index += 2; - - PrintDebug("MovToCR0 instr:\n"); - PrintTraceMemDump(instr, 15); - PrintDebug("EAX=%x\n", *(uint_t*)&(info->vm_regs.rax)); - - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - if (addr_type != REG_OPERAND) { - PrintDebug("Non-register operand in write to CR0\n"); - return -1; - } - - new_cr0 = (struct cr0_32 *)first_operand; - - PrintDebug("first operand=%x\n", *(uint_t *)first_operand); - - if (info->shdw_pg_mode == SHADOW_PAGING) { - struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - - if (new_cr0->pg == 1){ - // This should be new_cr0->pg && !(old_cr->pg), right? - // and then a case for turning paging off? - - struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); - - info->mem_mode = VIRTUAL_MEM; + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); - *shadow_cr0 = *new_cr0; - *real_cr0 = *new_cr0; - shadow_cr0->et = 1; - real_cr0->et = 1; - - // - // Activate Shadow Paging - // - PrintDebug("Turning on paging in the guest\n"); - - info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; + PrintDebug("Old Shadow CR0=%x\n", *shadow_cr0); - - } else if (new_cr0->pe == 0) { - info->cpu_mode = REAL; - info->mem_mode = PHYSICAL_MEM; - PrintDebug("Entering Real Mode\n"); - - PrintV3CtrlRegs(&(info->ctrl_regs)); - // reinstate the identity mapped paged tables - // But keep the shadow tables around to handle TLB issues.... UGH... - //info->shdw_pg_state.shadow_cr3 &= 0x00000fff; - //info->shdw_pg_state.shadow_cr3 |= ((addr_t)create_passthrough_pde32_pts(info) & ~0xfff); - - //info->ctrl_regs.cr3 = info->shdw_pg_state.shadow_cr3; + real_cr0->et = 1; + + *shadow_cr0 = *new_cr0; + shadow_cr0->et = 1; + + if (get_mem_mode(info) == VIRTUAL_MEM) { + struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3); + + info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3; + } else { info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt); - - *shadow_cr0 = *new_cr0; - *real_cr0 = *new_cr0; real_cr0->pg = 1; - shadow_cr0->et = 1; - real_cr0->et = 1; - - PrintV3CtrlRegs(&(info->ctrl_regs)); - } - - - } else { - *real_cr0 = *new_cr0; - } - - info->rip += index; - } else if ((instr[index] == cr_access_byte) && - (instr[index + 1] == lmsw_byte) && - (MODRM_REG(instr[index + 2]) == lmsw_reg_byte)) { - addr_t first_operand; - addr_t second_operand; - struct cr0_real *real_cr0; - struct cr0_real *new_cr0; - operand_type_t addr_type; - char new_cr0_val = 0; - - index += 2; - - real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0); - - addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16); - - if (addr_type == REG_OPERAND) { - new_cr0 = (struct cr0_real *)first_operand; - } else if (addr_type == MEM_OPERAND) { - addr_t host_addr; - // check segment descriptors.... - - /* TODO, TODO, TODO: Lookup segment overrides */ - struct v3_segment *lmsw_segment = &(info->segments.ds); - - if (info->mem_mode == PHYSICAL_MEM) { - if (guest_pa_to_host_va(info, get_addr_linear(info, first_operand, lmsw_segment), &host_addr) == -1) { - return -1; - } - } else { - if (guest_va_to_host_va(info, get_addr_linear(info, first_operand, lmsw_segment), &host_addr) == -1) { - return -1; - } - } - - new_cr0 = (struct cr0_real *)host_addr; - } else { - return -1; - } - - - if (new_cr0->pe == 0) { - // According to the intel manual this it is illegal to use - // lmsw to turn _off_ Protected mode - PrintDebug("Cannot switch to real mode with LMSW, unclear what to do\n"); - return -1; - } - - new_cr0_val = (*(char *)(new_cr0)) & 0x0f; - - - if (info->shdw_pg_mode == SHADOW_PAGING) { - struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0); - - PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - /* struct cr0_real is only 4 bits wide, - * so we can overwrite the real_cr0 without worrying about the shadow fields - */ - *(char*)real_cr0 &= 0xf0; - *(char*)real_cr0 |= new_cr0_val; - - *(char*)shadow_cr0 &= 0xf0; - *(char*)shadow_cr0 |= new_cr0_val; - - - PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0); - } else { - PrintDebug("Old CR0=%x\n", *real_cr0); - // for now we just pass through.... - *(char*)real_cr0 &= 0xf0; - *(char*)real_cr0 |= new_cr0_val; - - PrintDebug("New CR0=%x\n", *real_cr0); - } - - info->rip += index; - - - } else if ((instr[index] == 0x0f) && - (instr[index + 1] == 0x06)) { - // CLTS instruction - PrintDebug("CLTS instruction - clearing TS flag of real and shadow CR0\n"); - shadow_cr0->ts = 0; - real_cr0->ts = 0; - - index+=2; - - info->rip+=index; - - } else { - PrintDebug("Unkown instruction: \n"); - SerialMemDump(instr,15); - return -1; - } + + PrintDebug("New Shadow CR0=%x\n",*shadow_cr0); + } + PrintDebug("New CR0=%x\n", *real_cr0); } - break; - - case PROTECTED_PAE: - PrintDebug("Protected PAE Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; - case LONG: - PrintDebug("Protected Long Mode write to CR0 is UNIMPLEMENTED\n"); - return -1; + } else if (opcode_cmp(V3_OPCODE_CLTS, (const uchar_t *)(dec_instr.opcode)) == 0) { + // CLTS + struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0); + + real_cr0->ts = 0; - default: - { - PrintDebug("Unknown Mode write to CR0 (info->cpu_mode=0x%x\n)",info->cpu_mode); - return -1; + if (info->shdw_pg_mode == SHADOW_PAGING) { + struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0); + shadow_cr0->ts = 0; } - break; - } + info->rip += dec_instr.instr_length; + return 0; } @@ -488,7 +144,7 @@ int handle_cr0_read(struct guest_info * info) { int ret; PrintDebug("Real Mode read from CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs))); - PrintV3Segments(&(info->segments)); + //PrintV3Segments(info); // The real rip address is actually a combination of the rip + CS base ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); @@ -595,6 +251,8 @@ int handle_cr0_read(struct guest_info * info) { *virt_cr0 = *real_cr0; } + PrintDebug("Returning CR0: %x\n", *virt_cr0); + info->rip += index; } else { @@ -628,8 +286,10 @@ int handle_cr0_read(struct guest_info * info) { } - PrintDebug("Instr (15 bytes) at %x:\n", instr); - PrintTraceMemDump((char*)instr, 15); + /* + PrintDebug("Instr (15 bytes) at %x:\n", instr); + PrintTraceMemDump((char*)instr, 15); + */ if (ret != 15) { // I think we should inject a GPF into the guest @@ -691,14 +351,13 @@ int handle_cr0_read(struct guest_info * info) { if (info->mem_mode == PHYSICAL_MEM) { virt_cr0->pg = 0; // clear the pg bit because guest doesn't think it's on } - - PrintDebug("real CR0: %x\n", *(uint_t*)real_cr0); - PrintDebug("returned CR0: %x\n", *(uint_t*)virt_cr0); - } else { *virt_cr0 = *real_cr0; } + + PrintDebug("real CR0: %x\n", *(uint_t*)real_cr0); + PrintDebug("returned CR0: %x\n", *(uint_t*)virt_cr0); info->rip += index; @@ -741,7 +400,7 @@ int handle_cr3_write(struct guest_info * info) { int ret; char instr[15]; - PrintDebug("Real Mode Write to CR3??? What the fuck???\n"); + PrintDebug("Real Mode Write to CR3.\n"); // We need to read the instruction, which is at CS:IP, but that // linear address is guest physical without PG and guest virtual with PG @@ -845,7 +504,7 @@ int handle_cr3_write(struct guest_info * info) { } else { PrintDebug("Unknown Instruction\n"); - SerialMemDump(instr,15); + PrintTraceMemDump(instr,15); return -1; } @@ -865,10 +524,10 @@ int handle_cr3_write(struct guest_info * info) { // linear address is guest physical without PG and guest virtual with PG if (info->mem_mode == PHYSICAL_MEM) { // The real rip address is actually a combination of the rip + CS base - PrintDebug("Writing Guest CR3 Write (Physical Address)\n"); + //PrintDebug("Writing Guest CR3 Write (Physical Address)\n"); ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); } else { - PrintDebug("Writing Guest CR3 Write (Virtual Address)\n"); + //PrintDebug("Writing Guest CR3 Write (Virtual Address)\n"); // The real rip address is actually a combination of the rip + CS base ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); } @@ -980,7 +639,7 @@ int handle_cr3_write(struct guest_info * info) { } else { PrintDebug("Unknown Instruction\n"); - SerialMemDump(instr,15); + PrintTraceMemDump(instr,15); return -1; } } else { @@ -1005,8 +664,8 @@ int handle_cr3_read(struct guest_info * info) { linear_addr = get_addr_linear(info, info->rip, &(info->segments.cs)); - PrintDebug("RIP Linear: %x\n", linear_addr); - PrintV3Segments(&(info->segments)); + //PrintDebug("RIP Linear: %x\n", linear_addr); + //PrintV3Segments(info); ret = read_guest_pa_memory(info, linear_addr, 15, instr); @@ -1061,7 +720,7 @@ int handle_cr3_read(struct guest_info * info) { info->rip += index; } else { PrintDebug("Unknown Instruction\n"); - SerialMemDump(instr,15); + PrintTraceMemDump(instr,15); return -1; } @@ -1140,12 +799,12 @@ int handle_cr3_read(struct guest_info * info) { info->rip += index; } else { PrintDebug("Unknown Instruction\n"); - SerialMemDump(instr,15); + PrintTraceMemDump(instr,15); return -1; } } else { PrintDebug("Invalid operating Mode (0x%x), control registers follow\n", info->cpu_mode); - PrintV3CtrlRegs(&(info->ctrl_regs)); + PrintV3CtrlRegs(info); return -1; }