From: Souptick Joarder <jrdr.linux@gmail.com>
To: boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org
Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
Souptick Joarder <jrdr.linux@gmail.com>,
John Hubbard <jhubbard@nvidia.com>,
Paul Durrant <xadimgnik@gmail.com>
Subject: [PATCH v2 3/3] xen/privcmd: Convert get_user_pages*() to pin_user_pages*()
Date: Mon, 6 Jul 2020 23:46:12 +0530 [thread overview]
Message-ID: <1594059372-15563-4-git-send-email-jrdr.linux@gmail.com> (raw)
In-Reply-To: <1594059372-15563-1-git-send-email-jrdr.linux@gmail.com>
In 2019, we introduced pin_user_pages*() and now we are converting
get_user_pages*() to the new API as appropriate. [1] & [2] could
be referred for more information. This is case 5 as per document [1].
[1] Documentation/core-api/pin_user_pages.rst
[2] "Explicit pinning of user-space pages":
https://lwn.net/Articles/807108/
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Paul Durrant <xadimgnik@gmail.com>
---
drivers/xen/privcmd.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index f6c1543..5c5cd24 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -594,7 +594,7 @@ static int lock_pages(
if (requested > nr_pages)
return -ENOSPC;
- page_count = get_user_pages_fast(
+ page_count = pin_user_pages_fast(
(unsigned long) kbufs[i].uptr,
requested, FOLL_WRITE, pages);
if (page_count < 0)
@@ -610,13 +610,7 @@ static int lock_pages(
static void unlock_pages(struct page *pages[], unsigned int nr_pages)
{
- unsigned int i;
-
- for (i = 0; i < nr_pages; i++) {
- if (!PageDirty(pages[i]))
- set_page_dirty_lock(pages[i]);
- put_page(pages[i]);
- }
+ unpin_user_pages_dirty_lock(pages, nr_pages, true);
}
static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
--
1.9.1
next prev parent reply other threads:[~2020-07-06 18:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 18:16 [PATCH v2 0/3] Few bug fixes and Convert to pin_user_pages*() Souptick Joarder
2020-07-06 18:16 ` [PATCH v2 1/3] xen/privcmd: Corrected error handling path Souptick Joarder
2020-07-07 9:35 ` Jürgen Groß
2020-07-07 11:40 ` Souptick Joarder
2020-07-07 11:45 ` Jürgen Groß
2020-07-08 2:07 ` Souptick Joarder
2020-07-06 18:16 ` [PATCH v2 2/3] xen/privcmd: Mark pages as dirty Souptick Joarder
2020-07-07 9:38 ` Jürgen Groß
2020-07-07 11:30 ` Souptick Joarder
2020-07-07 11:43 ` Jürgen Groß
2020-07-07 19:30 ` John Hubbard
2020-07-08 5:40 ` Jürgen Groß
2020-07-06 18:16 ` Souptick Joarder [this message]
2020-07-07 11:49 ` [PATCH v2 3/3] xen/privcmd: Convert get_user_pages*() to pin_user_pages*() Jürgen Groß
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