On 02/13/2014 04:45 AM, Fengguang Wu wrote: > Greetings, > > I find that when running > > qemu-system-x86_64 -cpu qemu64,+smep,+smap > > Some kernels will 100% produce this error, where the error code > -13,-14 are -EACCES and -EFAULT: > > Any ideas? > I notice this is a non-SMAP kernel: # CONFIG_X86_SMAP is not set If the kernel turns on SMAP in CR4 even though SMAP isn't enabled in the kernel, that is a kernel bug. If Qemu enforces SMAP even if it is turned off in CR4, that would be a Qemu bug. I have reproduced the failure locally and an am considering both possibilities now. -hpa -- 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
