Thomas Gleixner
2020-Dec-09 21:07 UTC
[PATCH v2 03/12] x86/pv: switch SWAPGS to ALTERNATIVE
On Fri, Nov 20 2020 at 12:46, Juergen Gross wrote:> SWAPGS is used only for interrupts coming from user mode or for > returning to user mode. So there is no reason to use the PARAVIRT > framework, as it can easily be replaced by an ALTERNATIVE depending > on X86_FEATURE_XENPV. > > There are several instances using the PV-aware SWAPGS macro in paths > which are never executed in a Xen PV guest. Replace those with the > plain swapgs instruction. For SWAPGS_UNSAFE_STACK the same applies. > > Signed-off-by: Juergen Gross <jgross at suse.com> > Acked-by: Andy Lutomirski <luto at kernel.org> > Acked-by: Peter Zijlstra (Intel) <peterz at infradead.org>Reviewed-by: Thomas Gleixner <tglx at linutronix.de>