On 02/13/2014 06:55 AM, H. Peter Anvin wrote: > 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. > No, it is simply a second kernel bug. I have patches for both and will push them momentarily. -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
