KVM: Drop ad-hoc vendor specific instruction restriction

Use the new support in the emulator, and drop the ad-hoc code in x86.c.

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

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dd8016d..8575d85 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4411,39 +4411,16 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
                vcpu->arch.emulate_ctxt.have_exception = false;
                vcpu->arch.emulate_ctxt.perm_ok = false;
 
+               vcpu->arch.emulate_ctxt.only_vendor_specific_insn
+                       = emulation_type & EMULTYPE_TRAP_UD;
+
                r = x86_decode_insn(&vcpu->arch.emulate_ctxt, insn, insn_len);
 
                trace_kvm_emulate_insn_start(vcpu);
-
-               /* Only allow emulation of specific instructions on #UD
-                * (namely VMMCALL, sysenter, sysexit, syscall)*/
-               if (emulation_type & EMULTYPE_TRAP_UD) {
-                       if (!c->twobyte)
-                               return EMULATE_FAIL;
-                       switch (c->b) {
-                       case 0x01: /* VMMCALL */
-                               if (c->modrm_mod != 3 || c->modrm_rm != 1)
-                                       return EMULATE_FAIL;
-                               break;
-                       case 0x34: /* sysenter */
-                       case 0x35: /* sysexit */
-                               if (c->modrm_mod != 0 || c->modrm_rm != 0)
-                                       return EMULATE_FAIL;
-                               break;
-                       case 0x05: /* syscall */
-                               if (c->modrm_mod != 0 || c->modrm_rm != 0)
-                                       return EMULATE_FAIL;
-                               break;
-                       default:
-                               return EMULATE_FAIL;
-                       }
-
-                       if (!(c->modrm_reg == 0 || c->modrm_reg == 3))
-                               return EMULATE_FAIL;
-               }
-
                ++vcpu->stat.insn_emulation;
                if (r)  {
+                       if (emulation_type & EMULTYPE_TRAP_UD)
+                               return EMULATE_FAIL;
                        if (reexecute_instruction(vcpu, cr2))
                                return EMULATE_DONE;
                        if (emulation_type & EMULTYPE_SKIP)