linux-kernel - [PATCH 4.3 009/157] KVM: PPC: Book3S HV: Dont dynamically split core when already split

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Date:	Wed, 27 Jan 2016 10:11:16 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 4.3 009/157] KVM: PPC: Book3S HV: Dont dynamically split core when already split

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

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

From: Paul Mackerras <paulus@...ba.org>

commit f74f2e2e26199f695ca3df94f29e9ab7cb707ea4 upstream.

In static micro-threading modes, the dynamic micro-threading code
is supposed to be disabled, because subcores can't make independent
decisions about what micro-threading mode to put the core in - there is
only one micro-threading mode for the whole core.  The code that
implements dynamic micro-threading checks for this, except that the
check was missed in one case.  This means that it is possible for a
subcore in static 2-way micro-threading mode to try to put the core
into 4-way micro-threading mode, which usually leads to stuck CPUs,
spinlock lockups, and other stalls in the host.

The problem was in the can_split_piggybacked_subcores() function, which
should always return false if the system is in a static micro-threading
mode.  This fixes the problem by making can_split_piggybacked_subcores()
use subcore_config_ok() for its checks, as subcore_config_ok() includes
the necessary check for the static micro-threading modes.

Credit to Gautham Shenoy for working out that the reason for the hangs
and stalls we were seeing was that we were trying to do dynamic 4-way
micro-threading while we were in static 2-way mode.

Fixes: b4deba5c41e9
Signed-off-by: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kvm/book3s_hv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -2019,7 +2019,7 @@ static bool can_split_piggybacked_subcor
 			return false;
 		n_subcores += (cip->subcore_threads[sub] - 1) >> 1;
 	}
-	if (n_subcores > 3 || large_sub < 0)
+	if (large_sub < 0 || !subcore_config_ok(n_subcores + 1, 2))
 		return false;

 	/*