diff options
| author |   Nadav Amit <namit@cs.technion.ac.il> | 2014-06-02 18:34:03 +0300 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2014-06-18 17:46:15 +0200 |
| commit | 7fe864dc942c041cc4f56e287c4025d54a8e6c1e (patch) | |
| tree | 59a787182aaa8544aa03fb56bbbc9d183c40c93f | |
| parent | Linux 3.16-rc1 (diff) | |
KVM: x86: Mark VEX-prefix instructions emulation as unimplemented
Currently the emulator does not recognize vex-prefix instructions. However, it
may incorrectly decode lgdt/lidt instructions and try to execute them. This
patch returns unhandlable error on their emulation.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/emulate.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index e4e833d3d7d7..8ec4a3ebf403 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4314,6 +4314,13 @@ done_prefixes: if (ctxt->d & ModRM) ctxt->modrm = insn_fetch(u8, ctxt); + /* vex-prefix instructions are not implemented */ + if (ctxt->opcode_len == 1 && (ctxt->b == 0xc5 || ctxt->b == 0xc4) && + (mode == X86EMUL_MODE_PROT64 || + (mode >= X86EMUL_MODE_PROT16 && (ctxt->modrm & 0x80)))) { + ctxt->d = NotImpl; + } + while (ctxt->d & GroupMask) { switch (ctxt->d & GroupMask) { case Group: |