linux-kernel - [PATCH 0/2] xen: fix two issues in Xen pv qspinlock handling

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Date:   Mon,  1 Oct 2018 09:16:39 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org
Cc:     boris.ostrovsky@...cle.com, hpa@...or.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, Juergen Gross <jgross@...e.com>,
        Waiman.Long@...com, peterz@...radead.org
Subject: [PATCH 0/2] xen: fix two issues in Xen pv qspinlock handling

The Xen specific queue spinlock wait function has two issues which
could result in a hanging system.

They have a similar root cause of clearing a pending wakeup of a
waiting vcpu and later going to sleep waiting for the just cleared
wakeup event, which of course won't ever happen.

Juergen Gross (2):
  xen: fix race in xen_qlock_wait()
  xen: make xen_qlock_wait() nestable

 arch/x86/xen/spinlock.c | 33 ++++++++++++---------------------
 1 file changed, 12 insertions(+), 21 deletions(-)

Cc: Waiman.Long@...com
Cc: peterz@...radead.org

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