On 2011-06-15 13:33, Avi Kivity wrote: > On 06/15/2011 02:32 PM, Jan Kiszka wrote: >>> >>> If it isn't zero, there's still a good chance fopcode will be zero >>> (64-bit userspace, thread that hasn't used the fpu since the last >>> context switch, last opcode happened to be zero). >> >> I do not yet find "if fopcode is invalid, it is zero, just as IP and DP" >> in the spec. What clears them reliably? > > FNINIT
OK, I see. So we simply check for all fields being zero and skip the section in that case. The MSR doesn't actually to us here. Will write v2. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux
