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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/uapi/linux/virtio_balloon.h
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@@ -34,15 +34,31 @@
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 #define VIRTIO_BALLOON_F_MUST_TELL_HOST	0 /* Tell before reclaiming pages */
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 #define VIRTIO_BALLOON_F_STATS_VQ	1 /* Memory Stats virtqueue */
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 #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM	2 /* Deflate balloon on OOM */
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+#define VIRTIO_BALLOON_F_FREE_PAGE_HINT	3 /* VQ to report free pages */
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+#define VIRTIO_BALLOON_F_PAGE_POISON	4 /* Guest is using page poisoning */
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+#define VIRTIO_BALLOON_F_REPORTING	5 /* Page reporting virtqueue */
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 /* Size of a PFN in the balloon interface. */
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 #define VIRTIO_BALLOON_PFN_SHIFT 12
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+#define VIRTIO_BALLOON_CMD_ID_STOP	0
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+#define VIRTIO_BALLOON_CMD_ID_DONE	1
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 struct virtio_balloon_config {
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 	/* Number of pages host wants Guest to give up. */
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-	__u32 num_pages;
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+	__le32 num_pages;
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 	/* Number of pages we've actually got in balloon. */
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-	__u32 actual;
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+	__le32 actual;
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+	/*
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+	 * Free page hint command id, readonly by guest.
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+	 * Was previously named free_page_report_cmd_id so we
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+	 * need to carry that name for legacy support.
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+	 */
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+	union {
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+		__le32 free_page_hint_cmd_id;
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+		__le32 free_page_report_cmd_id;	/* deprecated */
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+	};
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+	/* Stores PAGE_POISON if page poisoning is in use */
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+	__le32 poison_val;
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 };
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 #define VIRTIO_BALLOON_S_SWAP_IN  0   /* Amount of memory swapped in */