From: Wei Wang <wei.w.wang@intel.com>
To: virtio-dev@lists.oasis-open.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
linux-mm@kvack.org, mst@redhat.com, mhocko@kernel.org,
akpm@linux-foundation.org
Cc: torvalds@linux-foundation.org, pbonzini@redhat.com,
wei.w.wang@intel.com, liliang.opensource@gmail.com,
yang.zhang.wz@gmail.com, quan.xu0@gmail.com, nilal@redhat.com,
riel@redhat.com, peterx@redhat.com
Subject: [PATCH v34 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON
Date: Mon, 25 Jun 2018 20:05:12 +0800 [thread overview]
Message-ID: <1529928312-30500-5-git-send-email-wei.w.wang@intel.com> (raw)
In-Reply-To: <1529928312-30500-1-git-send-email-wei.w.wang@intel.com>
The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the
guest is using page poisoning. Guest writes to the poison_val config
field to tell host about the page poisoning value that is in use.
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
drivers/virtio/virtio_balloon.c | 10 ++++++++++
include/uapi/linux/virtio_balloon.h | 3 +++
2 files changed, 13 insertions(+)
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index d05f0ba..c834ef1 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -801,6 +801,7 @@ static struct file_system_type balloon_fs = {
static int virtballoon_probe(struct virtio_device *vdev)
{
struct virtio_balloon *vb;
+ __u32 poison_val;
int err;
if (!vdev->config->get) {
@@ -840,6 +841,11 @@ static int virtballoon_probe(struct virtio_device *vdev)
INIT_WORK(&vb->report_free_page_work, report_free_page_func);
vb->cmd_id_received = VIRTIO_BALLOON_FREE_PAGE_REPORT_STOP_ID;
vb->cmd_id_active = VIRTIO_BALLOON_FREE_PAGE_REPORT_STOP_ID;
+ if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON)) {
+ memset(&poison_val, PAGE_POISON, sizeof(poison_val));
+ virtio_cwrite(vb->vdev, struct virtio_balloon_config,
+ poison_val, &poison_val);
+ }
}
vb->nb.notifier_call = virtballoon_oom_notify;
@@ -958,6 +964,9 @@ static int virtballoon_restore(struct virtio_device *vdev)
static int virtballoon_validate(struct virtio_device *vdev)
{
+ if (!page_poisoning_enabled())
+ __virtio_clear_bit(vdev, VIRTIO_BALLOON_F_PAGE_POISON);
+
__virtio_clear_bit(vdev, VIRTIO_F_IOMMU_PLATFORM);
return 0;
}
@@ -967,6 +976,7 @@ static unsigned int features[] = {
VIRTIO_BALLOON_F_STATS_VQ,
VIRTIO_BALLOON_F_DEFLATE_ON_OOM,
VIRTIO_BALLOON_F_FREE_PAGE_HINT,
+ VIRTIO_BALLOON_F_PAGE_POISON,
};
static struct virtio_driver virtio_balloon_driver = {
diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index 860456f..12b5a4f 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h
@@ -35,6 +35,7 @@
#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
#define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */
+#define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */
/* Size of a PFN in the balloon interface. */
#define VIRTIO_BALLOON_PFN_SHIFT 12
@@ -47,6 +48,8 @@ struct virtio_balloon_config {
__u32 actual;
/* Free page report command id, readonly by guest */
__u32 free_page_report_cmd_id;
+ /* Stores PAGE_POISON if page poisoning is in use */
+ __u32 poison_val;
};
struct virtio_balloon_free_page_hints_cmd {
--
2.7.4
next prev parent reply other threads:[~2018-06-25 12:30 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-25 12:05 [PATCH v34 0/4] Virtio-balloon: support free page reporting Wei Wang
2018-06-25 12:05 ` [PATCH v34 1/4] mm: support to get hints of free page blocks Wei Wang
2018-06-25 12:05 ` [PATCH v34 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT Wei Wang
2018-06-26 1:37 ` Michael S. Tsirkin
2018-06-26 3:46 ` Wei Wang
2018-06-26 3:56 ` Michael S. Tsirkin
2018-06-26 12:27 ` Wei Wang
2018-06-26 13:34 ` Michael S. Tsirkin
2018-06-27 1:24 ` Wei Wang
2018-06-27 2:41 ` Michael S. Tsirkin
2018-06-27 3:00 ` Wei Wang
2018-06-27 3:58 ` Michael S. Tsirkin
2018-06-27 5:27 ` Wei Wang
2018-06-27 16:53 ` [virtio-dev] " Michael S. Tsirkin
2018-06-25 12:05 ` [PATCH v34 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules Wei Wang
2018-06-25 12:05 ` Wei Wang [this message]
2018-06-27 11:06 ` [PATCH v34 0/4] Virtio-balloon: support free page reporting David Hildenbrand
2018-06-29 3:51 ` Wei Wang
2018-06-29 7:46 ` David Hildenbrand
2018-06-29 11:31 ` Wei Wang
2018-06-29 11:53 ` David Hildenbrand
2018-06-29 15:55 ` Wang, Wei W
2018-06-29 16:03 ` David Hildenbrand
2018-06-29 14:45 ` Michael S. Tsirkin
2018-06-29 15:28 ` David Hildenbrand
2018-06-29 15:52 ` Wang, Wei W
2018-06-29 16:32 ` Michael S. Tsirkin
2018-06-30 4:31 ` Wei Wang
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