linux-kernel - [PATCH 4.17 28/63] powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle)

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Date:   Mon, 23 Jul 2018 14:24:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Weimer <fweimer@...hat.com>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.17 28/63] powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle)

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>

commit b03897cf318dfc47de33a7ecbc7655584266f034 upstream.

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 returns zero on an
exit from stop4 (Power9 only) and above.

Thus in this situation, on POWER9, any call from sched_getcpu() always
returns zero, as on powerpc, we call __kernel_getcpu() which relies
upon SPRN_USPRG3 to report the CPU and NUMA node information.

Fix this by restoring SPRN_SPRG3 on wake up from a deep stop state
with the sprg_vdso value that is cached in PACA.

Fixes: e1c1cfed5432 ("powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle")
Cc: stable@...r.kernel.org # v4.14+
Reported-by: Florian Weimer <fweimer@...hat.com>
Signed-off-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
Reviewed-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/idle_book3s.S |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/powerpc/kernel/idle_book3s.S
+++ b/arch/powerpc/kernel/idle_book3s.S
@@ -144,7 +144,9 @@ power9_restore_additional_sprs:
 	mtspr	SPRN_MMCR1, r4

 	ld	r3, STOP_MMCR2(r13)
+	ld	r4, PACA_SPRG_VDSO(r13)
 	mtspr	SPRN_MMCR2, r3
+	mtspr	SPRN_SPRG3, r4
 	blr

 /*