From fb4616f43148c5b3f3e453a47657572d1bda39ee Mon Sep 17 00:00:00 2001 From: Mohammed Gamal Date: Mon, 1 Sep 2008 04:52:24 +0300 Subject: [PATCH] KVM: x86 emulator: Add std and cld instructions (opcodes 0xfc-0xfd) This adds the std and cld instructions to the emulator. Encountered while running the BIOS with invalid guest state emulation enabled. Signed-off-by: Mohammed Gamal Signed-off-by: Avi Kivity --- arch/x86/kvm/x86_emulate.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c index 66e0bd6c628b..944f1f4d4be4 100644 --- a/arch/x86/kvm/x86_emulate.c +++ b/arch/x86/kvm/x86_emulate.c @@ -187,7 +187,7 @@ static u16 opcode_table[256] = { ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3, /* 0xF8 - 0xFF */ ImplicitOps, 0, ImplicitOps, ImplicitOps, - 0, 0, Group | Group4, Group | Group5, + ImplicitOps, ImplicitOps, Group | Group4, Group | Group5, }; static u16 twobyte_table[256] = { @@ -1762,6 +1762,14 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) ctxt->eflags |= X86_EFLAGS_IF; c->dst.type = OP_NONE; /* Disable writeback. */ break; + case 0xfc: /* cld */ + ctxt->eflags &= ~EFLG_DF; + c->dst.type = OP_NONE; /* Disable writeback. */ + break; + case 0xfd: /* std */ + ctxt->eflags |= EFLG_DF; + c->dst.type = OP_NONE; /* Disable writeback. */ + break; case 0xfe ... 0xff: /* Grp4/Grp5 */ rc = emulate_grp45(ctxt, ops); if (rc != 0) -- GitLab