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KVM: x86 emulator: Add in/out instructions (opcodes 0xe4-0xe7, 0xec-0xef)

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The patch adds in/out instructions to the x86 emulator.

The instruction was encountered while running the BIOS while using
the invalid guest state emulation patch.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Mohammed Gamal 2008-09-06 17:22:29 +03:00 committed by Avi Kivity
parent fa89a81766
commit a6a3034cb9
1 changed files with 33 additions and 2 deletions
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35
arch/x86/kvm/x86_emulate.c
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@ -177,11 +177,14 @@ static u16 opcode_table[256] = {
/* 0xD8 - 0xDF */
0, 0, 0, 0, 0, 0, 0, 0,
/* 0xE0 - 0xE7 */
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0,
SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps,
SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps,
/* 0xE8 - 0xEF */
ImplicitOps | Stack, SrcImm | ImplicitOps,
ImplicitOps, SrcImmByte | ImplicitOps,
0, 0, 0, 0,
SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps,
SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps,
/* 0xF0 - 0xF7 */
0, 0, 0, 0,
ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3,
@ -1259,6 +1262,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
u64 msr_data;
unsigned long saved_eip = 0;
struct decode_cache *c = &ctxt->decode;
unsigned int port;
int io_dir_in;
int rc = 0;
/* Shadow copy of register state. Committed on successful emulation.
@ -1687,6 +1692,16 @@ special_insn:
c->src.val = c->regs[VCPU_REGS_RCX];
emulate_grp2(ctxt);
break;
case 0xe4: /* inb */
case 0xe5: /* in */
port = insn_fetch(u8, 1, c->eip);
io_dir_in = 1;
goto do_io;
case 0xe6: /* outb */
case 0xe7: /* out */
port = insn_fetch(u8, 1, c->eip);
io_dir_in = 0;
goto do_io;
case 0xe8: /* call (near) */ {
long int rel;
switch (c->op_bytes) {
@ -1737,6 +1752,22 @@ special_insn:
jmp_rel(c, c->src.val);
c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xec: /* in al,dx */
case 0xed: /* in (e/r)ax,dx */
port = c->regs[VCPU_REGS_RDX];
io_dir_in = 1;
goto do_io;
case 0xee: /* out al,dx */
case 0xef: /* out (e/r)ax,dx */
port = c->regs[VCPU_REGS_RDX];
io_dir_in = 0;
do_io: if (kvm_emulate_pio(ctxt->vcpu, NULL, io_dir_in,
(c->d & ByteOp) ? 1 : c->op_bytes,
port) != 0) {
c->eip = saved_eip;
goto cannot_emulate;
}
return 0;
case 0xf4: /* hlt */
ctxt->vcpu->arch.halt_request = 1;
break;