提交 dd307d01 编写于 作者: P Paolo Bonzini

KVM: x86: emulate sldt and str

These are needed to handle the descriptor table vmexits when emulating
UMIP.
Reviewed-by: NWanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
上级 ae3e61e1
......@@ -3633,17 +3633,27 @@ static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
static int em_store_sreg(struct x86_emulate_ctxt *ctxt, int segment)
{
if (ctxt->modrm_reg > VCPU_SREG_GS)
return emulate_ud(ctxt);
if (segment > VCPU_SREG_GS &&
(ctxt->ops->get_cr(ctxt, 4) & X86_CR4_UMIP) &&
ctxt->ops->cpl(ctxt) > 0)
return emulate_gp(ctxt, 0);
ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg);
ctxt->dst.val = get_segment_selector(ctxt, segment);
if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM)
ctxt->dst.bytes = 2;
return X86EMUL_CONTINUE;
}
static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
{
if (ctxt->modrm_reg > VCPU_SREG_GS)
return emulate_ud(ctxt);
return em_store_sreg(ctxt, ctxt->modrm_reg);
}
static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
{
u16 sel = ctxt->src.val;
......@@ -3659,6 +3669,11 @@ static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
return load_segment_descriptor(ctxt, sel, ctxt->modrm_reg);
}
static int em_sldt(struct x86_emulate_ctxt *ctxt)
{
return em_store_sreg(ctxt, VCPU_SREG_LDTR);
}
static int em_lldt(struct x86_emulate_ctxt *ctxt)
{
u16 sel = ctxt->src.val;
......@@ -3668,6 +3683,11 @@ static int em_lldt(struct x86_emulate_ctxt *ctxt)
return load_segment_descriptor(ctxt, sel, VCPU_SREG_LDTR);
}
static int em_str(struct x86_emulate_ctxt *ctxt)
{
return em_store_sreg(ctxt, VCPU_SREG_TR);
}
static int em_ltr(struct x86_emulate_ctxt *ctxt)
{
u16 sel = ctxt->src.val;
......@@ -4372,8 +4392,8 @@ static const struct opcode group5[] = {
};
static const struct opcode group6[] = {
DI(Prot | DstMem, sldt),
DI(Prot | DstMem, str),
II(Prot | DstMem, em_sldt, sldt),
II(Prot | DstMem, em_str, str),
II(Prot | Priv | SrcMem16, em_lldt, lldt),
II(Prot | Priv | SrcMem16, em_ltr, ltr),
N, N, N, N,
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册