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 941A73CB8EB; Wed, 5 Aug 2026 21:51:48 +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=1785966712; cv=none; b=euOVfBiCOfjXW8b4wnNBh0CVGk23itzJtqvFmKvxakRLW2Y4hBvCFvDralesvqAkoQnmp+0AxEahKXosRKk7pEGHHAmGDrvEArhFLFw6rLJEHlcA5mo7Yo4wxL1ELlHyol4n6orbyMl4wIY0rXnn86I2Fd9wQYInOYSWXNXmuE8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785966712; c=relaxed/simple; bh=95E1PqNczrCxavV/o6/W8K1u1uirBmlax+9507nO5CQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Vke9btvz3jQnoL42hDjm4cW8Ug926d6L/5BTWcr7iABOzuegxNytE5iWbji3Ep18Hhqlmx53cfekAnM9BLPM3zy29Rmr+gGWF2OqsaYA/P7VAWSHDYPmsc5t6F+KGVH7qLQ8gqtHiUfnxTfxhHChP7YNCuM8v1eR1RZ7absSVXA= 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=rG5WTlqw; 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="rG5WTlqw" 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=95E1PqNczrCxavV/o6/W8K1u1uirBmlax+9507nO5CQ=; b=rG5WTlqwm7eX1a1kDC++Y/f7jK jLvtZMKHt2Eqlb643JryzaAtTNyWBBAC1YR63elRPcP9+JZ4nPO3u5FLav0BwnYbHAPPqt8sIsSXz YXURmUDmMO2Bqd5uAvNoMVtw2fj8Au4jvGom5+aYU2Ya+3/Kt+SmyJ56SlbuA9WBIyy0uUg8Zfu5i PcZ21NZlIoJGoaDZcKb6uBFtV83Aje6QT0WkW/FNC49oUGIcI+vIh/mln0LaAkc/6RnKOa3RDlJlN FSMio25Y9H32WAQw3aTubRmZcR0d5gGBoJdZCyXJCiAnjjzxJE988T3EXrUwEifXKTnDp49GbASYg PAKOSB7g==; Received: from [2a07:aa00:8c:e0:768e:3fdc:fdc:fe75] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wrjWY-00000004lPX-2Rt8; Wed, 05 Aug 2026 21:51:42 +0000 Message-ID: <3a19ec60be238ba56ebe9c519fbeda0582aed67a.camel@infradead.org> Subject: Re: [PATCH v2 20/20] KVM: x86: Use gfn_to_pfn_cache for record_steal_time From: David Woodhouse To: Sean Christopherson Cc: sashiko-bot@kernel.org, pbonzini@redhat.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, sashiko-reviews@lists.linux.dev, stollmc@amazon.com Date: Wed, 05 Aug 2026 23:51:48 +0200 In-Reply-To: References: <20260530061932.7849D1F00893@smtp.kernel.org> <3291d47ea5fdd6ee2f284cadb518473130954cfc.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-PRxjyfeCJLGFk/3HZnP8" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@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 --=-PRxjyfeCJLGFk/3HZnP8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-06-08 at 17:45 -0700, Sean Christopherson wrote: > On Tue, Jun 02, 2026, David Woodhouse wrote: > > On Sat, 30 May 2026 06:19:32 +0000, sashiko-bot@kernel.org=C2=A0wrote: > > > [Severity: High] > > > Does this introduce a scheduling while atomic bug on non-PREEMPT_RT k= ernels? > > >=20 > > > The CLASS(gpc_map_local, st_map) macro acquires a read_lock on gpc->l= ock, > > > which disables preemption. While this lock is held, if the guest supp= orts > > > PV TLB flush, the code calls kvm_vcpu_flush_tlb_guest(). > > >=20 > > > If TDP is disabled (shadow paging), kvm_vcpu_flush_tlb_guest() calls > > > kvm_mmu_sync_roots() and eventually mmu_sync_children(). This path ca= n yield > > > via cond_resched_rwlock_write(). Yielding while preemption is disable= d by > > > the gpc read lock will trigger a BUG. > >=20 > > Ah, that issue exists in the previous versions too, but it's simple > > enough to fix. There's no particular timing constraint for flushing the > > TLB; it just have to be done before this vCPU ever runs again. It can > > just be moved to the end of the function after the lock is dropped. > >=20 > > That does mean record_steal_time() should use the explicit > > gpc_map_local_lock()/gpc_map_local_unlock() instead of the CLASS() > > macro, but that's easy enough. >=20 > Actually, we use KVM_REQ_TLB_FLUSH_GUEST and "optimize" the code for the = rare > case where KVM already have a TLB flushed queued for the vCPU.=C2=A0 E.g.= over two > patches (so that changing the order of the request processing is isolated= ): D'oh! Missed this when preparing the RCU-based v3, and Sashiko had to point it out again. (And I'm fairly sure most of the rest of the Sashiko feedback rings a bell too). 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