From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 9038C29E10B; Fri, 28 Aug 2026 11:16:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787915813; cv=none; b=WEAsFM4NhsnTY7KQrA/VplD1OOLP5I3UzfnGYkgB4SQc5bpLKUDCLb18hCWqRmB8wxDaElo8sTBxoWcfsEybpGkuP4DlZUszbFMf26B6COgud0pfR2Ege3tEYxd1By1bPaBWn6zQ7tKi3r88rUpoqC6yWaeESz5TfurwhGYzRHQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787915813; c=relaxed/simple; bh=yse5/LKom4aVngygitUQcc89XENvqq3Nywvy6tm+YmA=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=KB5e8lpja1itO89jOgcDdDgNqTkOFI/c+ehdNVaSl9ORgwoD5QqVCSPbtF2x3c7Dmn5IS/dDpOXE1IAaS7jkJiROZ3/VrheppmMmZkxJOjc9X2AVkzvuIEPvonFPJLGsOa6guRaBr68HWttuepNHhagsGDcHc7TT1C2dvTlSqfE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=DYh5QESA; arc=none smtp.client-ip=90.155.50.34 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=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="DYh5QESA" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=78ezFNYCHEx+KqZ5YKCkXk9kryxc2VqPRFSyUG1dQLA=; b=DYh5QESANwz3owpq2wJTXN+gyZ jaRze5v7GnJc+nM0jeYWM+MFR9cVC8R5n3fzRGwwWed/u7+AI3Yo/W4OtzhhySp+88JDXW2eKMiy/ 2s6T77FId+orD0Rvm/Ayvc6Fb6AQKA59Jyitl7w6QOVOtLqh6TNihCpFgOs2Z1OI2L6+Mnuthnb/K +8ZkaTEvoUrrEvEAxwmi7abJVynyxrMF10QGW6RTIuNNAMwoU7bRqHGxvOWi5yx72UqdUnNbo2NfW aHndBaHtrXJv3wSWOeJsZtd0aH3MhUD4s2AIPTzl36auYRIHadc5cJ7yucGxGfQD72gItpwrhnPsg ISve8/CA==; Received: from [2001:8b0:10b:5:c5bc:77fb:75d5:ffaf] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wzuZi-0000000EZqq-0IwZ; Fri, 28 Aug 2026 11:16:46 +0000 Message-ID: <33dfede6cca76de14ecffaaa92fd89da4114c94d.camel@infradead.org> Subject: Re: KVM: x86/mmu: __kvm_rmap_lock() preemption assert trips on PREEMPT_RT From: David Woodhouse To: Sebastian Andrzej Siewior , Sean Christopherson Cc: James Houghton , Paolo Bonzini , kvm@vger.kernel.org, linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org Date: Fri, 28 Aug 2026 12:16:28 +0100 In-Reply-To: <20260828104537.pXtV2G8D@linutronix.de> References: <8d47b43e1829ac92703723e6a1a4afc7a2eaacb5.camel@infradead.org> <20260828104537.pXtV2G8D@linutronix.de> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xbRt9YeHj9bf/dJoi5ib" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 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 casper.infradead.org. See http://www.infradead.org/rpr.html --=-xbRt9YeHj9bf/dJoi5ib Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-08-28 at 12:45 +0200, Sebastian Andrzej Siewior wrote: > On 2026-08-27 15:17:57 [-0700], Sean Christopherson wrote: > > > @@ -1745,11 +1754,15 @@ static bool kvm_rmap_age_gfn_range(struct kvm= *kvm, > > > =C2=A0 gfn_t gfn; > > > =C2=A0 int level; > > > =C2=A0 > > > +#ifdef CONFIG_PREEMPT_RT > > > + guard(read_lock)(&kvm->mmu_lock); > > > +#endif > >=20 > > And now I remember why I swept this under the rug.=C2=A0 This really sh= ould take > > mmu_lock for write, otherwise concurrent aging threads could theoretica= lly get > > stuck competing for KVM_RMAP_LOCKED.=C2=A0 Which is silly, because they= don't actually > > need to take a lock of any kind.=C2=A0 I.e. it's not super trivial? > >=20 > > Wait, duh.=C2=A0 It is trivial if mmu_lock is held, because then KVM ca= n operate on > > rmaps without any KVM_RMAP_LOCKED shenanigans.=C2=A0 I wouldn't test th= is because it > > might break horribly, but I think this? >=20 > So you drop the bit spinlock and rely on kvm->mmu_lock instead? No sure > why it should break horribly but it looks reasonable. 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