On 11/25/2014 09:28 AM, Jan Beulich wrote:
+ else + { + struct segment_register seg; + + hvm_get_segment_register(sampled, x86_seg_cs, &seg); + r->cs = seg.sel; + hvm_get_segment_register(sampled, x86_seg_ss, &seg); + r->ss = seg.sel; + if ( seg.attr.fields.dpl != 0 ) + *flags |= PMU_SAMPLE_USER;Is that how hardware treats it (CPL != 0 meaning user, rather than CPL == 3)?
You mean how *software* (e.g. Linux kernel) treats it? If yes, then for 32-bit user_mode() checks for (CS == 3) and for 64-bit it's !!(CS & 3).
Maybe you should surface CPL instead of a boolean flag?
Am I not already doing it by passing SS and CS to the guest? -boris
Anyway, with or without the adjustments (unless you go a 3rd way) Acked-by: Jan Beulich <jbeul...@suse.com> Jan
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