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 B8E25BA45 for ; Tue, 7 Mar 2023 17:57:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 063C2C433EF; Tue, 7 Mar 2023 17:57:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678211838; bh=Clc2LlgU3DfcK5nn/4ngzN3/NLuDljWS9YTrhLlzDE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qvNbZYwQSLgQ7/KSiZk3b28/0a2hsQaacR32gWoP0Sen1dbVVmA4gx+FA/k/dvCwj ZccpXKt4NSYtKvNfjFmF2ZGtDfeEIjOitSWjpSWEAP81+E1FVCMt72V0zU2DjRWKq7 3FubCGFNMXbrlZzF002qeDuonPWiw7uPU1LnIK7s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Steve Sistare , Kevin Tian , Jason Gunthorpe , Alex Williamson Subject: [PATCH 6.2 0992/1001] vfio/type1: track locked_vm per dma Date: Tue, 7 Mar 2023 18:02:44 +0100 Message-Id: <20230307170105.325908701@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170022.094103862@linuxfoundation.org> References: <20230307170022.094103862@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Steve Sistare commit 18e292705ba21cc9b3227b9ad5b1c28973605ee5 upstream. Track locked_vm per dma struct, and create a new subroutine, both for use in a subsequent patch. No functional change. Fixes: c3cbab24db38 ("vfio/type1: implement interfaces to update vaddr") Cc: stable@vger.kernel.org Signed-off-by: Steve Sistare Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Link: https://lore.kernel.org/r/1675184289-267876-4-git-send-email-steven.sistare@oracle.com Signed-off-by: Alex Williamson Signed-off-by: Greg Kroah-Hartman --- drivers/vfio/vfio_iommu_type1.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -101,6 +101,7 @@ struct vfio_dma { struct rb_root pfn_list; /* Ex-user pinned pfn list */ unsigned long *bitmap; struct mm_struct *mm; + size_t locked_vm; }; struct vfio_batch { @@ -413,6 +414,19 @@ static int vfio_iova_put_vfio_pfn(struct return ret; } +static int mm_lock_acct(struct task_struct *task, struct mm_struct *mm, + bool lock_cap, long npage) +{ + int ret = mmap_write_lock_killable(mm); + + if (ret) + return ret; + + ret = __account_locked_vm(mm, abs(npage), npage > 0, task, lock_cap); + mmap_write_unlock(mm); + return ret; +} + static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async) { struct mm_struct *mm; @@ -425,12 +439,9 @@ static int vfio_lock_acct(struct vfio_dm if (async && !mmget_not_zero(mm)) return -ESRCH; /* process exited */ - ret = mmap_write_lock_killable(mm); - if (!ret) { - ret = __account_locked_vm(mm, abs(npage), npage > 0, dma->task, - dma->lock_cap); - mmap_write_unlock(mm); - } + ret = mm_lock_acct(dma->task, mm, dma->lock_cap, npage); + if (!ret) + dma->locked_vm += npage; if (async) mmput(mm);