linux-kernel - [RFC PATCH v5 5/8] drivers: virtio: balloon

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Message-Id: <20221019095620.124909-6-alexander.atanasov@virtuozzo.com>
Date:   Wed, 19 Oct 2022 12:56:17 +0300
From:   Alexander Atanasov <alexander.atanasov@...tuozzo.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     kernel@...nvz.org,
        Alexander Atanasov <alexander.atanasov@...tuozzo.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH v5 5/8] drivers: virtio: balloon - report inflated memory

Update the inflated memory in the mm core when it changes.

Signed-off-by: Alexander Atanasov <alexander.atanasov@...tuozzo.com>
---
 drivers/virtio/virtio_balloon.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index d0c27c680721..e9c3642eef17 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -450,10 +450,15 @@ static void virtballoon_changed(struct virtio_device *vdev)
 static void update_balloon_size(struct virtio_balloon *vb)
 {
 	u32 actual = vb->num_pages;
+	long inflated_kb = actual << (VIRTIO_BALLOON_PFN_SHIFT - 10);
 
 	/* Legacy balloon config space is LE, unlike all other devices. */
 	virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, actual,
 			 &actual);
+	if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM))
+		balloon_set_inflated_free(inflated_kb);
+	else
+		balloon_set_inflated_total(inflated_kb);
 }
 
 static void update_balloon_stats_func(struct work_struct *work)
-- 
2.31.1