On Fri, 2018-02-16 at 00:12 +0100, Richard Weinberger wrote: > > [ 2.791518] Code: 8b 45 00 49 8b 7d 08 49 83 c5 18 31 d2 31 f6 ff > d0 49 8b 45 00 48 85 c0 75 e9 eb b1 b9 49 00 00 00 b8 01 00 00 00 ba > 00 00 00 00 <0f> 30 e9 68 fd ff ff 9c 58 0f 1f 44 00 00 48 89 c5 fa > 66 0f 1f 23: b9 49 00 00 00 mov $0x49,%ecx 28: b8 01 00 00 00 mov $0x1,%eax 2d: ba 00 00 00 00 mov $0x0,%edx 32: 0f 30 wrmsr The faulting instruction is the wrmsr itself. That shouldn't happen; if the CPUID bit indicates that the MSR exists, then it should exist. The reverted patch did use the C __wrmsr() macro which contained a fixup for this GP# but it was just a side-effect of the "cleanup" — it wasn't intentional because that really shouldn't happen. That looks like a qemu bug as first glance.
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