[PATCH v2 12/26] KVM: x86 emulator: emulate SGDT/SIDT

Avi Kivity
2012-06-27T15:19:58Z

Opcodes 0F 01 /0 and 0F 01 /1

Signed-off-by: Avi Kivity <avi@redhat.com>
---
arch/x86/kvm/emulate.c | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7552c0a..5053e9e 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3026,6 +3026,35 @@ static int em_vmcall(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}

+static int emulate_store_desc_ptr(struct x86_emulate_ctxt *ctxt,
+ void (*get)(struct x86_emulate_ctxt *ctxt,
+ struct desc_ptr *ptr))
+{
+ struct desc_ptr desc_ptr;
+
+ if (ctxt->mode == X86EMUL_MODE_PROT64)
+ ctxt->op_bytes = 8;
+ get(ctxt, &desc_ptr);
+ if (ctxt->op_bytes == 2) {
+ ctxt->op_bytes = 4;
+ desc_ptr.address &= 0x00ffffff;
+ }
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
+ return segmented_write(ctxt, ctxt->dst.addr.mem,
+ &desc_ptr, 2 + ctxt->op_bytes);
+}
+
+static int em_sgdt(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_store_desc_ptr(ctxt, ctxt->ops->get_gdt);
+}
+
+static int em_sidt(struct x86_emulate_ctxt *ctxt)
+{
+ return emulate_store_desc_ptr(ctxt, ctxt->ops->get_idt);
+}
+
static int em_lgdt(struct x86_emulate_ctxt *ctxt)
{
struct desc_ptr desc_ptr;
@@ -3485,8 +3514,8 @@ static int check_perm_out(struct x86_emulate_ctxt *ctxt)
};

static struct group_dual group7 = { {
- DI(Mov | DstMem | Priv, sgdt),
- DI(Mov | DstMem | Priv, sidt),
+ II(Mov | DstMem | Priv, em_sgdt, sgdt),
+ II(Mov | DstMem | Priv, em_sidt, sidt),
II(SrcMem | Priv, em_lgdt, lgdt),
II(SrcMem | Priv, em_lidt, lidt),
II(SrcNone | DstMem | Mov, em_smsw, smsw), N,
--
1.7.11