Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

On Fri, 2018-07-20 at 16:29 +1000, Michael Ellerman wrote: > Michael Neuling writes: > > On Fri, 2018-07-20 at 12:32 +1000, Michael Ellerman wrote: > > > Michael Neuling writes: > > > > On Wed, 2018-07-18 at 13:42 +0530, Gautham R Shenoy wrote: > > > > > On Wed, Jul 18, 2018 at 09:24:19AM +1000,

Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

Michael Neuling writes: > On Fri, 2018-07-20 at 12:32 +1000, Michael Ellerman wrote: >> Michael Neuling writes: >> > On Wed, 2018-07-18 at 13:42 +0530, Gautham R Shenoy wrote: >> > > On Wed, Jul 18, 2018 at 09:24:19AM +1000, Michael Neuling wrote: >> > > > >> > > > >

Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

On Fri, 2018-07-20 at 12:32 +1000, Michael Ellerman wrote: > Michael Neuling writes: > > On Wed, 2018-07-18 at 13:42 +0530, Gautham R Shenoy wrote: > > > On Wed, Jul 18, 2018 at 09:24:19AM +1000, Michael Neuling wrote: > > > > > > > > > DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); > > > > >

Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

Michael Neuling writes: > On Wed, 2018-07-18 at 13:42 +0530, Gautham R Shenoy wrote: >> On Wed, Jul 18, 2018 at 09:24:19AM +1000, Michael Neuling wrote: >> > >> > > DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); >> > > diff --git a/arch/powerpc/kernel/idle_book3s.S >> > >

Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

On Wed, 2018-07-18 at 13:42 +0530, Gautham R Shenoy wrote: > Hello Mikey, > > On Wed, Jul 18, 2018 at 09:24:19AM +1000, Michael Neuling wrote: > > > > > DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); > > > diff --git a/arch/powerpc/kernel/idle_book3s.S > > > b/arch/powerpc/kernel/idle_book3s.S >

Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

Hello Mikey, On Wed, Jul 18, 2018 at 09:24:19AM +1000, Michael Neuling wrote: > > > DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); > > diff --git a/arch/powerpc/kernel/idle_book3s.S > > b/arch/powerpc/kernel/idle_book3s.S > > index d85d551..5069d42 100644 > > ---

Re: [RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

> DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER); > diff --git a/arch/powerpc/kernel/idle_book3s.S > b/arch/powerpc/kernel/idle_book3s.S > index d85d551..5069d42 100644 > --- a/arch/powerpc/kernel/idle_book3s.S > +++ b/arch/powerpc/kernel/idle_book3s.S > @@ -120,6 +120,9 @@

[RESEND][PATCH] powerpc/powernv : Save/Restore SPRG3 on entry/exit from stop.

From: "Gautham R. Shenoy" On 64-bit servers, SPRN_SPRG3 and its userspace read-only mirror SPRN_USPRG3 are used as userspace VDSO write and read registers respectively. SPRN_SPRG3 is lost when we enter stop4 and above, and is currently not restored. As a result, any read from SPRN_USPRG3