KVM: x86 emulator: move 0F 01 sub-opcodes into their own functions

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 77a5f54..8e1d0c8 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2589,6 +2589,95 @@ static int em_clts(struct x86_emulate_ctxt *ctxt)
        return X86EMUL_CONTINUE;
 }
 
+static int em_vmcall(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       int rc;
+
+       if (c->modrm_mod != 3 || c->modrm_rm != 1)
+               return X86EMUL_UNHANDLEABLE;
+
+       rc = ctxt->ops->fix_hypercall(ctxt);
+       if (rc != X86EMUL_CONTINUE)
+               return rc;
+
+       /* Let the processor re-execute the fixed hypercall */
+       c->eip = ctxt->eip;
+       /* Disable writeback. */
+       c->dst.type = OP_NONE;
+       return X86EMUL_CONTINUE;
+}
+
+static int em_lgdt(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       struct desc_ptr desc_ptr;
+       int rc;
+
+       rc = read_descriptor(ctxt, ctxt->ops, c->src.addr.mem,
+                            &desc_ptr.size, &desc_ptr.address,
+                            c->op_bytes);
+       if (rc != X86EMUL_CONTINUE)
+               return rc;
+       ctxt->ops->set_gdt(ctxt, &desc_ptr);
+       /* Disable writeback. */
+       c->dst.type = OP_NONE;
+       return X86EMUL_CONTINUE;
+}
+
+static int em_svm(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       int rc;
+
+       switch (c->modrm_rm) {
+       case 1:
+               rc = ctxt->ops->fix_hypercall(ctxt);
+               break;
+       default:
+               return X86EMUL_UNHANDLEABLE;
+       }
+       /* Disable writeback. */
+       c->dst.type = OP_NONE;
+       return rc;
+}
+
+static int em_lidt(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       struct desc_ptr desc_ptr;
+       int rc;
+
+       rc = read_descriptor(ctxt, ctxt->ops, c->src.addr.mem,
+                            &desc_ptr.size,
+                            &desc_ptr.address,
+                            c->op_bytes);
+       if (rc != X86EMUL_CONTINUE)
+               return rc;
+       ctxt->ops->set_idt(ctxt, &desc_ptr);
+       /* Disable writeback. */
+       c->dst.type = OP_NONE;
+       return X86EMUL_CONTINUE;
+}
+
+static int em_smsw(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+
+       c->dst.bytes = 2;
+       c->dst.val = ctxt->ops->get_cr(ctxt, 0);
+       return X86EMUL_CONTINUE;
+}
+
+static int em_lmsw(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       ctxt->ops->set_cr(ctxt, 0, (ctxt->ops->get_cr(ctxt, 0) & ~0x0eul)
+                         | (c->src.val & 0x0f));
+       c->dst.type = OP_NONE;
+       return X86EMUL_CONTINUE;
+}
+
 static bool valid_cr(int nr)
 {
        switch (nr) {
@@ -3509,7 +3598,6 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
        int rc = X86EMUL_CONTINUE;
        int saved_dst_type = c->dst.type;
        int irq; /* Used for int 3, int, and into */
-       struct desc_ptr desc_ptr;
 
        ctxt->decode.mem_read.pos = 0;
 
@@ -4022,62 +4110,26 @@ twobyte_insn:
        case 0x01: /* lgdt, lidt, lmsw */
                switch (c->modrm_reg) {
                case 0: /* vmcall */
-                       if (c->modrm_mod != 3 || c->modrm_rm != 1)
-                               goto cannot_emulate;
-
-                       rc = ctxt->ops->fix_hypercall(ctxt);
-                       if (rc != X86EMUL_CONTINUE)
-                               goto done;
-
-                       /* Let the processor re-execute the fixed hypercall */
-                       c->eip = ctxt->eip;
-                       /* Disable writeback. */
-                       c->dst.type = OP_NONE;
+                       rc = em_vmcall(ctxt);
                        break;
                case 2: /* lgdt */
-                       rc = read_descriptor(ctxt, ops, c->src.addr.mem,
-                                            &desc_ptr.size, &desc_ptr.address,
-                                            c->op_bytes);
-                       if (rc != X86EMUL_CONTINUE)
-                               goto done;
-                       ctxt->ops->set_gdt(ctxt, &desc_ptr);
-                       /* Disable writeback. */
-                       c->dst.type = OP_NONE;
+                       rc = em_lgdt(ctxt);
                        break;
                case 3: /* lidt/vmmcall */
-                       if (c->modrm_mod == 3) {
-                               switch (c->modrm_rm) {
-                               case 1:
-                                       rc = ctxt->ops->fix_hypercall(ctxt);
-                                       break;
-                               default:
-                                       goto cannot_emulate;
-                               }
-                       } else {
-                               rc = read_descriptor(ctxt, ops, c->src.addr.mem,
-                                                    &desc_ptr.size,
-                                                    &desc_ptr.address,
-                                                    c->op_bytes);
-                               if (rc != X86EMUL_CONTINUE)
-                                       goto done;
-                               ctxt->ops->set_idt(ctxt, &desc_ptr);
-                       }
-                       /* Disable writeback. */
-                       c->dst.type = OP_NONE;
+                       if (c->modrm_mod == 3)
+                               return em_svm(ctxt);
+                       else
+                               return em_lidt(ctxt);
                        break;
                case 4: /* smsw */
-                       c->dst.bytes = 2;
-                       c->dst.val = ops->get_cr(ctxt, 0);
+                       rc = em_smsw(ctxt);
                        break;
                case 6: /* lmsw */
-                       ops->set_cr(ctxt, 0, (ops->get_cr(ctxt, 0) & ~0x0eul) |
-                                   (c->src.val & 0x0f));
-                       c->dst.type = OP_NONE;
+                       rc = em_lmsw(ctxt);
                        break;
                case 5: /* not defined */
-                       emulate_ud(ctxt);
-                       rc = X86EMUL_PROPAGATE_FAULT;
-                       goto done;
+                       rc = emulate_ud(ctxt);
+                       break;
                case 7: /* invlpg*/
                        rc = em_invlpg(ctxt);
                        break;