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Tue, 22 Nov 2022 09:13:41 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id A1A4E3001D7; Tue, 22 Nov 2022 10:13:40 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 88F4A2D669369; Tue, 22 Nov 2022 10:13:40 +0100 (CET) Date: Tue, 22 Nov 2022 10:13:40 +0100 From: Peter Zijlstra To: Kai Huang Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, seanjc@google.com, pbonzini@redhat.com, dave.hansen@intel.com, dan.j.williams@intel.com, rafael.j.wysocki@intel.com, kirill.shutemov@linux.intel.com, ying.huang@intel.com, reinette.chatre@intel.com, len.brown@intel.com, tony.luck@intel.com, ak@linux.intel.com, isaku.yamahata@intel.com, chao.gao@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, bagasdotme@gmail.com, sagis@google.com, imammedo@redhat.com Subject: Re: [PATCH v7 06/20] x86/virt/tdx: Shut down TDX module in case of error Message-ID: References: <48505089b645019a734d85c2c29f3c8ae2dbd6bd.1668988357.git.kai.huang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <48505089b645019a734d85c2c29f3c8ae2dbd6bd.1668988357.git.kai.huang@intel.com> ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=pass header.d=infradead.org header.s=desiato.20200630 header.b=OsSMiaw1; spf=none (imf03.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.92.199) smtp.mailfrom=peterz@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669108425; a=rsa-sha256; cv=none; b=NVNbvF73txA3T40RaURw9/JYMER/adpfo2du6f0bSllhgPFzrD8/WyRO6EVk/dVxZMEZhg WNDgNzb61rq2ezbgGIzIia9Vkw/1LKxDbqpaYWlZIUUihrM9fn3+hRpUtC+iW8rOGiumKd OeZ80njT9kMw/Bmc0vsFRp2X3l5PfxE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669108425; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=tAJyYdDr0qopnArMHRvaYWXVoISL97AHjwr5u25VtnE=; b=BhAAjZQHZ0xznWdNxLPpatPHuocz8uxNfPe64DU22w7aq4HMymdW8xyO7aFq+2daKt8/yj vJeIgkaVy0steH014satTnqG1HddbrcYuOAtaF8oreTaRBfSo0ctIuvBEAnXBdQjo6hkWw mgVxORdBbca469/H/71hq6xlDHnuNgk= X-Rspam-User: Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=infradead.org header.s=desiato.20200630 header.b=OsSMiaw1; spf=none (imf03.hostedemail.com: domain of peterz@infradead.org has no SPF policy when checking 90.155.92.199) smtp.mailfrom=peterz@infradead.org; dmarc=none X-Stat-Signature: sae8z1u3wi9xpdjrgncq73giokrisdwh X-Rspamd-Queue-Id: 503DB20011 X-Rspamd-Server: rspam09 X-HE-Tag: 1669108425-722937 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000031, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 21, 2022 at 01:26:28PM +1300, Kai Huang wrote: > +/* > + * Call the SEAMCALL on all online CPUs concurrently. Caller to check > + * @sc->err to determine whether any SEAMCALL failed on any cpu. > + */ > +static void seamcall_on_each_cpu(struct seamcall_ctx *sc) > +{ > + on_each_cpu(seamcall_smp_call_function, sc, true); > +} Suppose the user has NOHZ_FULL configured, and is already running userspace that will terminate on interrupt (this is desired feature for NOHZ_FULL), guess how happy they'll be if someone, on another parition, manages to tickle this TDX gunk?