From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E1785633EF for ; Mon, 26 Feb 2024 12:30:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708950654; cv=none; b=D/etP5MZNbV5HmDRJZpqqO6/y7P5yqhoh8XYsslxyWzGI9STDI9+RCgZYyHhegYgTFaFX4AC6k/oywqB4RbCZpTeKm5OIyeFMCdU5TzBe0qnCZEgJ4rtxq82HindnwTIApilwTmuNUUVjazpOWUYiej9LTEFbwT5qHawMV5PuOQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708950654; c=relaxed/simple; bh=9aScO8XkyGOJZIXe6eN1r9cuwhNBuX8XI2o/2TD5u4E=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=jGyXgpXaEuHLGtKrOMrzCArwyT1PUxjZCqSshoNHYSBn+Ig1zATxFlFHvi9/CseSe4tLjnBovNfd99EhLZuMIoD8Dk4lbfC9qK7eO2TlVoUNQ4hlGaw1F1yRj4wJ65Y4LunSAkAENjDkNCbLLwqlzut9mTtSH77azsM3yIzcgWo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eTBC1wnC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="eTBC1wnC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1AECAC433C7; Mon, 26 Feb 2024 12:30:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708950653; bh=9aScO8XkyGOJZIXe6eN1r9cuwhNBuX8XI2o/2TD5u4E=; h=Subject:To:Cc:From:Date:From; b=eTBC1wnCYwcDOCRego3PO9MFbLrPFPphb5Srv7m5ryHieI0nfVv9vFWLFV5Gc3K6e vUyKOBXaoS4I2wjH5kDPHS5tRax2Qz2csu/9y0PduQKqgwGYK7IXgpZ93hp9tBER76 g2k2s2Xoghux1dfZm3Cb1SWRd2jkrCqudV3/8xMs= Subject: FAILED: patch "[PATCH] irqchip/gic-v3-its: Do not assume vPE tables are preallocated" failed to apply to 5.15-stable tree To: oliver.upton@linux.dev,gcherian@marvell.com,maz@kernel.org,tglx@linutronix.de Cc: From: Date: Mon, 26 Feb 2024 13:30:50 +0100 Message-ID: <2024022650-washroom-undusted-2aff@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x ec4308ecfc887128a468f03fb66b767559c57c23 # git commit -s git send-email --to '' --in-reply-to '2024022650-washroom-undusted-2aff@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: ec4308ecfc88 ("irqchip/gic-v3-its: Do not assume vPE tables are preallocated") c0cdc89072a3 ("irqchip/gic-v3-its: Give the percpu rdist struct its own flags field") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From ec4308ecfc887128a468f03fb66b767559c57c23 Mon Sep 17 00:00:00 2001 From: Oliver Upton Date: Mon, 19 Feb 2024 18:58:06 +0000 Subject: [PATCH] irqchip/gic-v3-its: Do not assume vPE tables are preallocated The GIC/ITS code is designed to ensure to pick up any preallocated LPI tables on the redistributors, as enabling LPIs is a one-way switch. There is no such restriction for vLPIs, and for GICv4.1 it is expected to allocate a new vPE table at boot. This works as intended when initializing an ITS, however when setting up a redistributor in cpu_init_lpis() the early return for preallocated RD tables skips straight past the GICv4 setup. This all comes to a head when trying to kexec() into a new kernel, as the new kernel silently fails to set up GICv4, leading to a complete loss of SGIs and LPIs for KVM VMs. Slap a band-aid on the problem by ensuring its_cpu_init_lpis() always initializes GICv4 on the way out, even if the other RD tables were preallocated. Fixes: 6479450f72c1 ("irqchip/gic-v4: Fix occasional VLPI drop") Reported-by: George Cherian Co-developed-by: Marc Zyngier Signed-off-by: Marc Zyngier Signed-off-by: Oliver Upton Signed-off-by: Thomas Gleixner Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240219185809.286724-2-oliver.upton@linux.dev diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 53abd4779914..b822752c4261 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3181,6 +3181,7 @@ static void its_cpu_init_lpis(void) val |= GICR_CTLR_ENABLE_LPIS; writel_relaxed(val, rbase + GICR_CTLR); +out: if (gic_rdists->has_vlpis && !gic_rdists->has_rvpeid) { void __iomem *vlpi_base = gic_data_rdist_vlpi_base(); @@ -3216,7 +3217,6 @@ static void its_cpu_init_lpis(void) /* Make sure the GIC has seen the above */ dsb(sy); -out: gic_data_rdist()->flags |= RD_LOCAL_LPI_ENABLED; pr_info("GICv3: CPU%d: using %s LPI pending table @%pa\n", smp_processor_id(),