When emulating LTR/LDTR/LGDT/LIDT, #GP should be injected if the base is non-canonical. Otherwise, VM-entry will fail. Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx> --- arch/x86/kvm/emulate.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index d6bea35..830da4b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1600,6 +1600,9 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt, sizeof(base3), &ctxt->exception); if (ret != X86EMUL_CONTINUE) return ret; + if (is_noncanonical_address(get_desc_base(&seg_desc) | + ((u64)base3 << 32))) + return emulate_gp(ctxt, 0); } load: ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg); @@ -3319,6 +3322,9 @@ static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt) ctxt->op_bytes); if (rc != X86EMUL_CONTINUE) return rc; + if (ctxt->mode == X86EMUL_MODE_PROT64 && + is_noncanonical_address(desc_ptr.address)) + return emulate_gp(ctxt, 0); if (lgdt) ctxt->ops->set_gdt(ctxt, &desc_ptr); else -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
