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 266EE30DEDE; Wed, 19 Nov 2025 22:35:31 +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=1763591732; cv=none; b=D3hA5THzKN8ZiCh0goe1KAZIUDGJo3NjRyCXLIygm5XWUXM+9JVyHz5sSHYHQI2nRcP7Gvg7x8DyTZBwyJ6qh7AMS6FiH8q4KgfkP8w4yEF7f9cj7ZDcDoRwobeOnq0w2+COhcz5dQjlPchKTwjxckAV/w71CpnCkSA9JMuvaow= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763591732; c=relaxed/simple; bh=sDyW89qPXT3xdQtj10GxlHLo6uAfus5uHKYULC7hRl4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ntZ0xjekzDtv4jllJ/dH069Y9gSVqJgLGdIQnkFmXKkNmlG09dnWIA34cUMt2LgtmjKHhytyITicEFhKyDnD2EOtUHS4kYO44zc5j/vCF7laSxfiGftBaPAa1VZ9VV0VrnBZJA896C8EWP7THVUp0sMYePrxcRx+MQnTrP+uYwg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rt0Vg+lz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="rt0Vg+lz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8992C19421; Wed, 19 Nov 2025 22:35:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763591731; bh=sDyW89qPXT3xdQtj10GxlHLo6uAfus5uHKYULC7hRl4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rt0Vg+lzXkk7T3RVTZNY/ZGYbm7HWy7YYAeYDktDAgzB4DG+fqhFxJ5KVxgemCpAx uLpKJ9LFrcVGvOxsgPcurh4KAT+/qHiy1K/4LKT2Dm9uDQ/ighMwPkz/pGOPsnspTh 4lYlwLHJ7xsi4KdUReKoML5WaUtgAWxtxo3zO80+zHLqltFeUAimDZrIpa/z9GStJv xk1CUYTjSbP1YqQm5+RTWnvx4hDWT0j1wtZ4JRAv82Pm3mMtdzPbapGNA62yOdODBb sxqkZ05AoP+HlPlYAsYdtCMW7wcf32HmiJcY36JRkjy0tHFD9w+MpEg5fiSC4AxWL+ L4S0oZ1e+P/FA== From: Oliver Upton To: Marc Zyngier , Raghavendra Rao Ananta Cc: Oliver Upton , Mingwei Zhang , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH 0/3] KVM: arm64: Reschedule as needed when destroying the stage-2 page-tables Date: Wed, 19 Nov 2025 14:35:28 -0800 Message-ID: <176359161125.183996.17801262311162275177.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251113052452.975081-1-rananta@google.com> References: <20251113052452.975081-1-rananta@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit On Thu, 13 Nov 2025 05:24:49 +0000, Raghavendra Rao Ananta wrote: > When destroying a fully-mapped 128G VM abruptly, the following scheduler > warning is observed: > > sched: CPU 0 need_resched set for > 100018840 ns (100 ticks) without schedule > CPU: 0 UID: 0 PID: 9617 Comm: kvm_page_table_ Tainted: G O 6.16.0-smp-DEV #3 NONE > Tainted: [O]=OOT_MODULE > Call trace: > show_stack+0x20/0x38 (C) > dump_stack_lvl+0x3c/0xb8 > dump_stack+0x18/0x30 > resched_latency_warn+0x7c/0x88 > sched_tick+0x1c4/0x268 > update_process_times+0xa8/0xd8 > tick_nohz_handler+0xc8/0x168 > __hrtimer_run_queues+0x11c/0x338 > hrtimer_interrupt+0x104/0x308 > arch_timer_handler_phys+0x40/0x58 > handle_percpu_devid_irq+0x8c/0x1b0 > generic_handle_domain_irq+0x48/0x78 > gic_handle_irq+0x1b8/0x408 > call_on_irq_stack+0x24/0x30 > do_interrupt_handler+0x54/0x78 > el1_interrupt+0x44/0x88 > el1h_64_irq_handler+0x18/0x28 > el1h_64_irq+0x84/0x88 > stage2_free_walker+0x30/0xa0 (P) > __kvm_pgtable_walk+0x11c/0x258 > __kvm_pgtable_walk+0x180/0x258 > __kvm_pgtable_walk+0x180/0x258 > __kvm_pgtable_walk+0x180/0x258 > kvm_pgtable_walk+0xc4/0x140 > kvm_pgtable_stage2_destroy+0x5c/0xf0 > kvm_free_stage2_pgd+0x6c/0xe8 > kvm_uninit_stage2_mmu+0x24/0x48 > kvm_arch_flush_shadow_all+0x80/0xa0 > kvm_mmu_notifier_release+0x38/0x78 > __mmu_notifier_release+0x15c/0x250 > exit_mmap+0x68/0x400 > __mmput+0x38/0x1c8 > mmput+0x30/0x68 > exit_mm+0xd4/0x198 > do_exit+0x1a4/0xb00 > do_group_exit+0x8c/0x120 > get_signal+0x6d4/0x778 > do_signal+0x90/0x718 > do_notify_resume+0x70/0x170 > el0_svc+0x74/0xd8 > el0t_64_sync_handler+0x60/0xc8 > el0t_64_sync+0x1b0/0x1b8 > > [...] Applied to next, thanks! [1/3] KVM: arm64: Only drop references on empty tables in stage2_free_walker https://git.kernel.org/kvmarm/kvmarm/c/156f70afcfec [2/3] KVM: arm64: Split kvm_pgtable_stage2_destroy() https://git.kernel.org/kvmarm/kvmarm/c/d68d66e57e2b [3/3] KVM: arm64: Reschedule as needed when destroying the stage-2 page-tables https://git.kernel.org/kvmarm/kvmarm/c/4ddfab5436b6 -- Best, Oliver