Date: Mon, 4 May 2015 04:27:24 +0000 (UTC) From: Neel Natu <neel@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r282407 - head/sys/amd64/vmm Message-ID: <201505040427.t444ROCq042644@svn.freebsd.org>
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Author: neel Date: Mon May 4 04:27:23 2015 New Revision: 282407 URL: https://svnweb.freebsd.org/changeset/base/282407 Log: Emulate the 'CMP r/m8, imm8' instruction encountered when booting a Windows Vista guest. Reported by: Leon Dang (ldang@nahannisys.com) MFC after: 1 week Modified: head/sys/amd64/vmm/vmm_instruction_emul.c Modified: head/sys/amd64/vmm/vmm_instruction_emul.c ============================================================================== --- head/sys/amd64/vmm/vmm_instruction_emul.c Mon May 4 00:47:22 2015 (r282406) +++ head/sys/amd64/vmm/vmm_instruction_emul.c Mon May 4 04:27:23 2015 (r282407) @@ -178,14 +178,20 @@ static const struct vie_op one_byte_opco .op_byte = 0x23, .op_type = VIE_OP_TYPE_AND, }, + [0x80] = { + /* Group 1 extended opcode */ + .op_byte = 0x80, + .op_type = VIE_OP_TYPE_GROUP1, + .op_flags = VIE_OP_F_IMM8, + }, [0x81] = { - /* XXX Group 1 extended opcode */ + /* Group 1 extended opcode */ .op_byte = 0x81, .op_type = VIE_OP_TYPE_GROUP1, .op_flags = VIE_OP_F_IMM, }, [0x83] = { - /* XXX Group 1 extended opcode */ + /* Group 1 extended opcode */ .op_byte = 0x83, .op_type = VIE_OP_TYPE_GROUP1, .op_flags = VIE_OP_F_IMM8, @@ -1066,9 +1072,13 @@ emulate_cmp(void *vm, int vcpuid, uint64 rflags2 = getcc(size, op1, op2); break; + case 0x80: case 0x81: case 0x83: /* + * 80 /7 cmp r/m8, imm8 + * REX + 80 /7 cmp r/m8, imm8 + * * 81 /7 cmp r/m16, imm16 * 81 /7 cmp r/m32, imm32 * REX.W + 81 /7 cmp r/m64, imm32 sign-extended to 64 @@ -1084,6 +1094,8 @@ emulate_cmp(void *vm, int vcpuid, uint64 * the status flags. * */ + if (vie->op.op_byte == 0x80) + size = 1; /* get the first operand */ error = memread(vm, vcpuid, gpa, &op1, size, arg);
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