From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 22CDECA5FB1 for ; Wed, 30 Sep 2026 12:23:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=e940AjQ0jQQWP5rvA/K+cI8JuO4iBqCxD/BwdAtAYs4=; b=UUx3QOhNrP4+xxa9Smfzlm/hxH kND1LShFWMaj+QuGGmyfbXg3NEKM4COmHjWoHToKqdmZIVE0VQGEyQSVinTi/iIx+VOyn1hUeiu2v hwIzkUFyJJkg4Vsl8subpG31++S66b92/NIkq22y5aimWrewz/b83saI4PQsQWAdY0x6mrh7aqBS/ rO2KUHpvQS4ogXJRrXEbuX0NyofS9nINJZLmKcVYeNS+XOaUCIltSD96P+m1aXkUtD/N5QDbMOf8b pK9cVMXRVStETh5Qdvt+9sDcwVXYVIOwv0ranVYlYoHJn1qVfSUh03KLePZ/deqN+M9q8hP8dhXPD FP+W2tmA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBtKo-00000005zY3-3cY7; Wed, 30 Sep 2026 12:22:54 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xBtKn-00000005zXj-0mh1 for linux-arm-kernel@lists.infradead.org; Wed, 30 Sep 2026 12:22:53 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id DEC9743CF4; Wed, 30 Sep 2026 12:22:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DCF61F000FF; Wed, 30 Sep 2026 12:22:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790770972; bh=e940AjQ0jQQWP5rvA/K+cI8JuO4iBqCxD/BwdAtAYs4=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=F0oRsWWXI7cbEARvdQkabseN2gp44WIpQVNuE/0AkzSDAGAgCZXFPcsVXdXOr+geq GGYwyMqQ9suXrzuHRYoXQTn4NOKC+ohlTrADPmXyMS2HtJ1Ht0XVvJbBu7+aquz7z5 cJzQu3XiOuJ+WN2nw/do4NQ17GWT0wnMy6nOjV87y3B1xVeaaYaKfQodMmx8qk9D// FBRbTLog09XQEzFfg63eT4h0npUi6RNaa9/M1uFzmZxO9SaBSkbXB+bcWPEZPGjCbE G8X4ej00Dsb/LGM7V82i3+ND78qecMiGc/J69Ru1VYwi2GlxFAOo/wcULsj3Ok8u3B zhhITKCmiPxSQ== Message-ID: <4d3be415-6d51-46f7-81ca-ab2dcf0f0f74@kernel.org> Date: Wed, 30 Sep 2026 14:22:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v20 9/9] firmware: arm_rmm: hotplug: Skip memory added to ZONE_MOVABLE To: Suzuki K Poulose , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com References: <20260929221623.1342076-1-suzuki.poulose@arm.com> <20260929221623.1342076-10-suzuki.poulose@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/30/26 00:16, Suzuki K Poulose wrote: > If the hotadded memory is in ZONE_MOVABLE, we could allow that to proceed > without the RMM having fine grained tracking, as we won't allocate pages > from there for guest-memfd or kernel allocation > > Cc: Catalin Marinas > Cc: David Hildenbrand (Arm) > Signed-off-by: Suzuki K Poulose > --- > Changes since v19: > - New patch in v20, keeping this at the tail to allow for the rest of the > series to proceed, while this patch gets discussed. > --- > drivers/firmware/arm_rmm/rmi.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/drivers/firmware/arm_rmm/rmi.c b/drivers/firmware/arm_rmm/rmi.c > index d4d098448e46e..ef0a171ba9677 100644 > --- a/drivers/firmware/arm_rmm/rmi.c > +++ b/drivers/firmware/arm_rmm/rmi.c > @@ -1043,6 +1043,18 @@ static int rmi_memory_notifier(struct notifier_block *nb, > start = PFN_PHYS(arg->start_pfn); > end = PFN_PHYS(arg->start_pfn + arg->nr_pages); > > + /* > + * If the hotplugged memory region is in ZONE_MOVABLE, neither the > + * guest-memfd nor the kernel allocations can come from there. So we are > + * fine to skip this. > + * For boot time memory, we don't allow this discount, as the > + * decision to move boot memory pages to ZONE_MOVABLE is purely > + * a kernel choice and the firmware must have decided what it covers. > + */ > + if (page_zonenum(pfn_to_page(arg->start_pfn)) == ZONE_MOVABLE && > + page_zonenum(pfn_to_page(arg->start_pfn + arg->nr_pages - 1)) == ZONE_MOVABLE) > + return NOTIFY_DONE; > + is_zone_movable_page(pfn_to_page(start_pfn) as used by virtio-mem should be sufficient. Checking only the start pfn is sufficient. -- Cheers, David