* Please apply commit 0828137e8f16 ("powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()") to v4.14.y, v4.19.y, v5.4.y, v5.7.y
@ 2020-08-25 22:44 Thadeu Lima de Souza Cascardo
2020-08-26 10:29 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Thadeu Lima de Souza Cascardo @ 2020-08-25 22:44 UTC (permalink / raw)
To: stable; +Cc: sashal, linuxppc-dev, gregkh
After commit 912c0a7f2b5daa3cbb2bc10f303981e493de73bd ("powerpc/64s: Save FSCR
to init_task.thread.fscr after feature init"), which has been applied to the
referred branches, when userspace sets the user DSCR MSR, it won't be inherited
or restored during context switch, because the facility unavailable interrupt
won't trigger.
Applying 0828137e8f16721842468e33df0460044a0c588b ("powerpc/64s: Don't init
FSCR_DSCR in __init_FSCR()") will fix it.
Cascardo.
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Please apply commit 0828137e8f16 ("powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()") to v4.14.y, v4.19.y, v5.4.y, v5.7.y
2020-08-25 22:44 Please apply commit 0828137e8f16 ("powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()") to v4.14.y, v4.19.y, v5.4.y, v5.7.y Thadeu Lima de Souza Cascardo
@ 2020-08-26 10:29 ` Greg KH
2020-08-26 11:58 ` Michael Ellerman
0 siblings, 1 reply; 3+ messages in thread
From: Greg KH @ 2020-08-26 10:29 UTC (permalink / raw)
To: Thadeu Lima de Souza Cascardo; +Cc: sashal, linuxppc-dev, stable
On Tue, Aug 25, 2020 at 07:44:08PM -0300, Thadeu Lima de Souza Cascardo wrote:
> After commit 912c0a7f2b5daa3cbb2bc10f303981e493de73bd ("powerpc/64s: Save FSCR
> to init_task.thread.fscr after feature init"), which has been applied to the
> referred branches, when userspace sets the user DSCR MSR, it won't be inherited
> or restored during context switch, because the facility unavailable interrupt
> won't trigger.
>
> Applying 0828137e8f16721842468e33df0460044a0c588b ("powerpc/64s: Don't init
> FSCR_DSCR in __init_FSCR()") will fix it.
Now queued up, thanks.
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: Please apply commit 0828137e8f16 ("powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()") to v4.14.y, v4.19.y, v5.4.y, v5.7.y
2020-08-26 10:29 ` Greg KH
@ 2020-08-26 11:58 ` Michael Ellerman
0 siblings, 0 replies; 3+ messages in thread
From: Michael Ellerman @ 2020-08-26 11:58 UTC (permalink / raw)
To: Greg KH, Thadeu Lima de Souza Cascardo; +Cc: sashal, linuxppc-dev, stable
Greg KH <gregkh@linuxfoundation.org> writes:
> On Tue, Aug 25, 2020 at 07:44:08PM -0300, Thadeu Lima de Souza Cascardo wrote:
>> After commit 912c0a7f2b5daa3cbb2bc10f303981e493de73bd ("powerpc/64s: Save FSCR
>> to init_task.thread.fscr after feature init"), which has been applied to the
>> referred branches, when userspace sets the user DSCR MSR, it won't be inherited
>> or restored during context switch, because the facility unavailable interrupt
>> won't trigger.
>>
>> Applying 0828137e8f16721842468e33df0460044a0c588b ("powerpc/64s: Don't init
>> FSCR_DSCR in __init_FSCR()") will fix it.
Oops, thanks for catching it.
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
> Now queued up, thanks.
Thanks.
cheers
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-08-25 22:44 Please apply commit 0828137e8f16 ("powerpc/64s: Don't init FSCR_DSCR in __init_FSCR()") to v4.14.y, v4.19.y, v5.4.y, v5.7.y Thadeu Lima de Souza Cascardo
2020-08-26 10:29 ` Greg KH
2020-08-26 11:58 ` Michael Ellerman
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