From patchwork Thu Oct 24 09:34:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: qinyuntan X-Patchwork-Id: 13848639 Received: from out30-100.freemail.mail.aliyun.com (out30-100.freemail.mail.aliyun.com [115.124.30.100]) (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 AC1FE1C07C1; Thu, 24 Oct 2024 09:34:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.100 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729762495; cv=none; b=pHgnEkQLrzmP0iZJEj1BoRViphl77c1Oo8o3zi6bDgXTI9sfsPUPsCstX9YFxUoC3yOl+FxWkrI/ptP/1HNjuVKdwc7N9IvsFoj1R71mPjVXeNRMXGRDqjBHFfxEU2hLok5gK4jSQkdlXiKhq7rvHf6NGZtfEBnxiQWHq7ZIpXo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729762495; c=relaxed/simple; bh=+yesL1/Tjzt5TF8Vnp9EeBw/ptoHOo1EBeTHV+wYTQQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LB4YSHaEt5rSmeFgN6HZHk+Gw1VR379CaQ/bHHBZYqd23cAopOv8logz2E760tnCr9xaTkXTrR/uA0fQDOwVbxcb0zeRwQlQRpk9IlauChdoP7Sl8Wdcbdn81tppPwKG0fgmvkmGeSGTFrVZD7hH00c9axH0TpGQO7/xLk9uSQo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=wM9sxCdb; arc=none smtp.client-ip=115.124.30.100 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="wM9sxCdb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1729762490; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=wMMJARvMklmy7JTnx9koiikH8rF5s7OtNVXr+o/den4=; b=wM9sxCdbJ1sWc7pqU89ZSgKshGkpDU2+qND7ekkjUckOJXZ7lT0c667IdrvhJ4bdN8Ajjs/rINJEWYtxUw1T7PnSHHnwDfTYB8Emj4OFp78OlfBXm7ze6kDbbmilOuZZHvfbwUXFZQPfRp1dbUa7wWHPGW01YXvsqnaaaOCHhRs= Received: from localhost.localdomain(mailfrom:qinyuntan@linux.alibaba.com fp:SMTPD_---0WHoiyxC_1729762488 cluster:ay36) by smtp.aliyun-inc.com; Thu, 24 Oct 2024 17:34:49 +0800 From: Qinyun Tan To: Andrew Morton , Alex Williamson Cc: linux-mm@kvack.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Qinyun Tan , Guanghui Feng , Xunlei Pang Subject: [PATCH v1: vfio: avoid unnecessary pin memory when dma map io address space 1/2] mm: introduce vma flag VM_PGOFF_IS_PFN Date: Thu, 24 Oct 2024 17:34:43 +0800 Message-ID: X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce a new vma flag 'VM_PGOFF_IS_PFN', which means vma->vm_pgoff == pfn. This allows us to directly obtain pfn through vma->vm_pgoff. No Functional Change. Signed-off-by: Qinyun Tan Reviewed-by: Guanghui Feng Reviewed-by: Xunlei Pang --- include/linux/mm.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index ecf63d2b05825..80849b1b9aa92 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -322,6 +322,12 @@ extern unsigned int kobjsize(const void *objp); #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ +#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS /* vma->vm_pgoff == pfn */ + #define VM_PGOFF_IS_PFN BIT(62) +#else + #define VM_PGOFF_IS_PFN VM_NONE +#endif + #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */