On 11/27/2017 02:31 PM, Peter Zijlstra wrote: > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -1442,7 +1442,10 @@ void syscall_init(void) > (entry_SYSCALL_64_trampoline - _entry_trampoline); > > wrmsr(MSR_STAR, 0, (__USER32_CS << 16) | __KERNEL_CS); > - wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline); > + if (kaiser_enabled) > + wrmsrl(MSR_LSTAR, SYSCALL64_entry_trampoline); > + else > + wrmsrl(MSR_LSTAR, (unsigned long)entry_SYSCALL_64);
Heh, ask and ye shall receive, I guess. We do need a Documentation/ update now. For this, and other things. I'll put something together.
