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Date: Tue, 12 Jul 2016 21:20:21 +0200
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [RFC PATCH 2/4] KVM: x86: emulate sldt and str
These will be used to emulate UMIP through VMX descriptor-table
vmexits.
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
arch/x86/kvm/emulate.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index a2f24af3c999..3e09c7461ba8 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3577,15 +3577,20 @@ static int em_rdmsr(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
+static int em_store_sreg(struct x86_emulate_ctxt *ctxt, int segment)
+{
+ 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);
- ctxt->dst.val = get_segment_selector(ctxt, ctxt->modrm_reg);
- if (ctxt->dst.bytes == 4 && ctxt->dst.type == OP_MEM)
- ctxt->dst.bytes = 2;
- return X86EMUL_CONTINUE;
+ return em_store_sreg(ctxt, ctxt->modrm_reg);
}
static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
@@ -3603,6 +3608,11 @@ 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;
@@ -3612,6 +3622,11 @@ 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;
@@ -4161,8 +4176,8 @@ 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,
--
1.8.3.1
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