diff options
| author |   Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> | 2011-11-22 15:20:47 +0900 |
|---|---|---|
| committer |   Avi Kivity <avi@redhat.com> | 2011-12-27 11:17:31 +0200 |
| commit | e940b5c20f89282fe826c5e2237932ab280497cf (patch) | |
| tree | 94ae1350f5260033039764f0ac5f106765136536 /arch/x86/kvm | |
| parent | KVM: x86 emulator: Use opcode::execute for WRMSR/RDMSR (diff) | |
| download | linux-dev-e940b5c20f89282fe826c5e2237932ab280497cf.tar.xz linux-dev-e940b5c20f89282fe826c5e2237932ab280497cf.zip | |
KVM: x86 emulator: Use opcode::execute for CMPXCHG
CMPXCHG: 0F B0, 0F B1
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 906c5eb34aa7..799000d8bf8b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1832,6 +1832,24 @@ static int em_ret_far(struct x86_emulate_ctxt *ctxt) return rc; } +static int em_cmpxchg(struct x86_emulate_ctxt *ctxt) +{ + /* Save real source value, then compare EAX against destination. */ + ctxt->src.orig_val = ctxt->src.val; + ctxt->src.val = ctxt->regs[VCPU_REGS_RAX]; + emulate_2op_SrcV(ctxt, "cmp"); + + if (ctxt->eflags & EFLG_ZF) { + /* Success: write back to memory. */ + ctxt->dst.val = ctxt->src.orig_val; + } else { + /* Failure: write the value we saw to EAX. */ + ctxt->dst.type = OP_REG; + ctxt->dst.addr.reg = (unsigned long *)&ctxt->regs[VCPU_REGS_RAX]; + } + return X86EMUL_CONTINUE; +} + static int em_lseg(struct x86_emulate_ctxt *ctxt) { int seg = ctxt->src2.val; @@ -3400,7 +3418,7 @@ static struct opcode twobyte_table[256] = { D(DstMem | SrcReg | Src2CL | ModRM), D(ModRM), I(DstReg | SrcMem | ModRM, em_imul), /* 0xB0 - 0xB7 */ - D2bv(DstMem | SrcReg | ModRM | Lock | PageTable), + I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_cmpxchg), I(DstReg | SrcMemFAddr | ModRM | Src2SS, em_lseg), I(DstMem | SrcReg | ModRM | BitOp | Lock, em_btr), I(DstReg | SrcMemFAddr | ModRM | Src2FS, em_lseg), @@ -4153,23 +4171,6 @@ twobyte_insn: break; case 0xae: /* clflush */ break; - case 0xb0 ... 0xb1: /* cmpxchg */ - /* - * Save real source value, then compare EAX against - * destination. - */ - ctxt->src.orig_val = ctxt->src.val; - ctxt->src.val = ctxt->regs[VCPU_REGS_RAX]; - emulate_2op_SrcV(ctxt, "cmp"); - if (ctxt->eflags & EFLG_ZF) { - /* Success: write back to memory. */ - ctxt->dst.val = ctxt->src.orig_val; - } else { - /* Failure: write the value we saw to EAX. */ - ctxt->dst.type = OP_REG; - ctxt->dst.addr.reg = (unsigned long *)&ctxt->regs[VCPU_REGS_RAX]; - } - break; case 0xb6 ... 0xb7: /* movzx */ ctxt->dst.bytes = ctxt->op_bytes; ctxt->dst.val = (ctxt->d & ByteOp) ? (u8) ctxt->src.val |