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Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jkuU7-0003Gj-L4; Mon, 15 Jun 2020 19:09:31 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id E7166301A32; Mon, 15 Jun 2020 21:09:28 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D1EA4201CB844; Mon, 15 Jun 2020 21:09:28 +0200 (CEST) Date: Mon, 15 Jun 2020 21:09:28 +0200 From: Peter Zijlstra To: Fenghua Yu Subject: Re: [PATCH v2 12/12] x86/traps: Fix up invalid PASID Message-ID: <20200615190928.GJ2531@hirez.programming.kicks-ass.net> References: <1592008893-9388-1-git-send-email-fenghua.yu@intel.com> <1592008893-9388-13-git-send-email-fenghua.yu@intel.com> <20200615075649.GK2497@hirez.programming.kicks-ass.net> <20200615154854.GB13792@romley-ivt3.sc.intel.com> <20200615160357.GA2531@hirez.programming.kicks-ass.net> <20200615181259.GC13792@romley-ivt3.sc.intel.com> <20200615183116.GD2531@hirez.programming.kicks-ass.net> <20200615185529.GD13792@romley-ivt3.sc.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200615185529.GD13792@romley-ivt3.sc.intel.com> Cc: Dave Hansen , H Peter Anvin , Dave Jiang , Ashok Raj , x86 , amd-gfx , Ingo Molnar , Ravi V Shankar , Yu-cheng Yu , Andrew Donnellan , Borislav Petkov , Thomas Gleixner , Tony Luck , linuxppc-dev , Felix Kuehling , linux-kernel , iommu@lists.linux-foundation.org, Jacob Jun Pan , Frederic Barrat , David Woodhouse X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, Jun 15, 2020 at 11:55:29AM -0700, Fenghua Yu wrote: > Or do you suggest to add a random new flag in struct thread_info instead > of a TIF flag? Why thread_info? What's wrong with something simple like the below. It takes a bit from the 'strictly current' flags word. diff --git a/include/linux/sched.h b/include/linux/sched.h index b62e6aaf28f0..fca830b97055 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -801,6 +801,9 @@ struct task_struct { /* Stalled due to lack of memory */ unsigned in_memstall:1; #endif +#ifdef CONFIG_PCI_PASID + unsigned has_valid_pasid:1; +#endif unsigned long atomic_flags; /* Flags requiring atomic access. */ diff --git a/kernel/fork.c b/kernel/fork.c index 142b23645d82..10b3891be99e 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -955,6 +955,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) tsk->use_memdelay = 0; #endif +#ifdef CONFIG_PCI_PASID + tsk->has_valid_pasid = 0; +#endif + #ifdef CONFIG_MEMCG tsk->active_memcg = NULL; #endif _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu