From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7FE9F3EF0A0; Thu, 7 May 2026 13:43:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778161412; cv=none; b=qMkWWKs6Vwh/hmIa7Y+xKUNLWHbQDaaxfVg+apCHA94ACJ7miCxJ6ygq3BRbw5Q1vEppzM38UOzg3YVebHXtJrd1zQYpqSrpDXQ8xRu9WU2Ufb3vzZyqkT6dKV+tEwLu4gUuNVbmD8GUVOtMeBqa5x+XqW50V+81kZERjxvWK4Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778161412; c=relaxed/simple; bh=QUm506ZL5SLevPs4jte/E6h2zGVUtWm7sHkg+PLjsX8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=oavuwXCFKT3I/6nuRanzBere/A88HZSj6G7Hvs+yVNt8AI58V0cS3eAiQWt/FcuME2m9p6cySDOr6DohMLYi6l+4cDCr/qvWqYSXTdXRkA3cnVqbg63nGRN3asALsSXP+b38AGxD5keLy0X6mtds6lumAF/gDPOOdAQgqX1+pIw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=pwc5yMAu; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pwc5yMAu" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Mzt+2bXJYcRgYV5+nFdzTfFzH5NJ08dyQfJICccEyiE=; b=pwc5yMAuAGWok6Ejw8VCUOFVZP jDGd3te4Md5OSAVZpmAT0T8WxJSofpb+g2CupFYzQPIPzcMlMN2qmH5j/CePmhyLPRGoxaFAEHeGn yhZLqhfsUeghiS8fK31ASzqmutYOmgSlzKWm9l4uOkC+sXaXbCKdriXWAhQ/GGWyqt1OxCbzadsWT NCt61uvagH0yx/vIjdVEEkfvas7wh9CnrJACD3crkougUC24CxeQEjNE1fHWuKYZam4AEM4Pbezm/ kZijw3T+1caTGdLwFIqhGPJNUPRWEgPA3jszT7rh7QLdtJ6I7pIp+ssVXJ0XDsV49Xcn+THVRkdF3 +qoTSlAg==; Received: from [172.31.31.148] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKz0a-00000003f2T-2Swo; Thu, 07 May 2026 13:43:21 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86/xen: bail in IRQ context on PREEMPT_RT in kvm_xen_set_evtchn_fast() From: David Woodhouse To: Sebastian Andrzej Siewior Cc: Mauricio Faria de Oliveira , Paul Durrant , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Clark Williams , Steven Rostedt , kernel-dev@igalia.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, syzbot+208f7f3e5f59c11aeb90@syzkaller.appspotmail.com Date: Thu, 07 May 2026 14:43:20 +0100 In-Reply-To: <20260507132115.w1nOBvlS@linutronix.de> References: <20260506-xen-rt-sleep-v1-1-53b6b60a671d@igalia.com> <8e7bc66a7994ca06f164a5d5f7ceb3f07d3a1357.camel@infradead.org> <20260507071235.rdb4aGeE@linutronix.de> <20260507132115.w1nOBvlS@linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-UKAELhCR8fiUKJc+NKYG" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-UKAELhCR8fiUKJc+NKYG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-05-07 at 15:21 +0200, Sebastian Andrzej Siewior wrote: > On 2026-05-07 14:00:49 [+0100], David Woodhouse wrote: > > On Thu, 2026-05-07 at 09:12 +0200, Sebastian Andrzej Siewior wrote: > > >=20 > > > So the cited patch does not look bad. That read-trylock should be fin= e > > > on RT (as in I don't see anything wrong with it). What did happen to = it? > >=20 > > The read_trylock() may be fine... but does a read_unlock() try to > > "re-enable" hardirqs? >=20 > Yes, I missed it while looking for it. This could become a _irqsave(). >=20 > We do this already for spinlock_t/ rt_spin_lock()/ _unlock() because it > is used during early boot where interrupts are disabled and locks are > acquired. So it needs to preserve the state and since rwlock_t is not > (yet) used during early boot it was not done/ observed. >=20 > The try-lock on the read lock just increments a counter in order to > acquire the lock. This is it. The spinlock_t on the other hand records > the current context as owner which can lead to a mess. Therefore a > trylock on a spinlock_t from hardirq context is wrong but it should be > doable for rwlock_t. I don't see anything wrong with it (except for this > one thing can be corrected). Thanks. Something like this? =46rom 7199173d543d25333418537bcf07d6b2fce18ff1 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Thu, 7 May 2026 14:39:22 +0100 Subject: [PATCH] locking/rt: Use raw_spin_lock_irqsave() in __rwbase_read_unlock() __rwbase_read_unlock() uses raw_spin_lock_irq()/raw_spin_unlock_irq() which unconditionally disables and re-enables interrupts. When read_unlock() is called from hardirq context (e.g. after a successful read_trylock() in a timer callback), the raw_spin_unlock_irq() incorrectly re-enables interrupts within the hardirq handler. This causes lockdep warnings ('hardirqs_on_prepare' from hardirq context) and can lead to IRQ state corruption. Switch to raw_spin_lock_irqsave()/raw_spin_unlock_irqrestore() to preserve the caller's IRQ state, matching the pattern already used for rt_spin_lock/unlock. Signed-off-by: David Woodhouse --- kernel/locking/rwbase_rt.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/locking/rwbase_rt.c b/kernel/locking/rwbase_rt.c index 82e078c0665a..25744862d627 100644 --- a/kernel/locking/rwbase_rt.c +++ b/kernel/locking/rwbase_rt.c @@ -153,8 +153,9 @@ static void __sched __rwbase_read_unlock(struct rwbase_= rt *rwb, struct rt_mutex_base *rtm =3D &rwb->rtmutex; struct task_struct *owner; DEFINE_RT_WAKE_Q(wqh); + unsigned long flags; =20 - raw_spin_lock_irq(&rtm->wait_lock); + raw_spin_lock_irqsave(&rtm->wait_lock, flags); /* * Wake the writer, i.e. the rtmutex owner. 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