| Message ID | 1401723251-8034-2-git-send-email-namit@cs.technion.ac.il (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index e4e833d..8ec4a3e 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:
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> --- arch/x86/kvm/emulate.c | 7 +++++++ 1 file changed, 7 insertions(+)