diff options
| author | Avi Kivity <avi@redhat.com> | 2011-02-01 15:32:04 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-03-17 17:08:28 +0100 |
| commit | 4005996e428b0d3df10cd0eba389a14b9f5403e4 (patch) | |
| tree | 2a91030c3c0f0f22120dccb0311fb7688e22d33c /arch | |
| parent | KVM: x86 emulator: vendor specific instructions (diff) | |
| download | linux-4005996e428b0d3df10cd0eba389a14b9f5403e4.tar.xz linux-4005996e428b0d3df10cd0eba389a14b9f5403e4.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/x86.c | 33 |
1 files changed, 5 insertions, 28 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index dd8016d2efa9..8575d85202d7 100644 --- 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) |