Messages in this thread | | | Date | Wed, 17 Jan 2018 10:02:38 +0100 | From | Joerg Roedel <> | Subject | Re: [PATCH 02/16] x86/entry/32: Enter the kernel via trampoline stack |
| |
Hi Boris,
thanks for testing this :)
On Tue, Jan 16, 2018 at 09:47:06PM -0500, Boris Ostrovsky wrote: > On 01/16/2018 11:36 AM, Joerg Roedel wrote: > >+.macro SWITCH_TO_KERNEL_STACK nr_regs=0 check_user=0 > > > This (and next patch's SWITCH_TO_ENTRY_STACK) need X86_FEATURE_PTI check. > > With those macros fixed I was able to boot 32-bit Xen PV guest.
Hmm, on bare metal the stack switch happens regardless of the X86_FEATURE_PTI feature being set, because we always program tss.sp0 with the systenter stack. How is the kernel entry stack setup on xen-pv? I think something is missing there instead.
Regards,
Joerg
| |