On 01/31/12 11:36, Jan Beulich wrote:
On 31.01.12 at 10:34, Laszlo Ersek<ler...@redhat.com> wrote:
Is it justified to kill the emulator when this happens (eg. memory
mapped IO with 64-bit operand)?
The AMD manual specifies that REX.W is ignored; the Intel manual
doesn't mention REX at all here. However, if a decoder incorrectly
decodes the guest instruction, that's a bug there. So imo qemu
validly treats this condition as fatal.
From the Itanium(R) SDM rev 2.3,
10.7.2.1 I/O Port Addressing Restrictions
For the 64MB physical I/O port block the following operations are
undefined and may result in unpredictable processor operation;
references larger than 4-bytes, [...]
It seems that not only a decoding failure can trigger this.
Laszlo
