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Add support for the page reporting feature provided by virtio-balloon. Reporting differs from the regular balloon functionality in that is is much less durable than a standard memory balloon. Instead of creating a list of pages that cannot be accessed the pages are only inaccessible while they are being indicated to the virtio interface. Once the interface has acknowledged them they are placed back into their respective free lists and are once again accessible by the guest system. Unlike a standard balloon we don't inflate and deflate the pages. Instead we perform the reporting, and once the reporting is completed it is assumed that the page has been dropped from the guest and will be faulted back in the next time the page is accessed. Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Nitesh Narayan Lal <nitesh@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Pankaj Gupta <pagupta@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Rik van Riel <riel@surriel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Wei Wang <wei.w.wang@intel.com> Cc: Yang Zhang <yang.zhang.wz@gmail.com> Cc: wei qi <weiqi4@huawei.com> Link: http://lkml.kernel.org/r/20200211224657.29318.68624.stgit@localhost.localdomain Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
112 lines
5 KiB
C
112 lines
5 KiB
C
#ifndef _LINUX_VIRTIO_BALLOON_H
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#define _LINUX_VIRTIO_BALLOON_H
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/* This header is BSD licensed so anyone can use the definitions to implement
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* compatible drivers/servers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE. */
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#include <linux/types.h>
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#include <linux/virtio_types.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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/* The feature bitmap for virtio balloon */
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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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/* Number of pages we've actually got in balloon. */
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__u32 actual;
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/* Free page report command id, readonly by guest */
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__u32 free_page_report_cmd_id;
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/* Stores PAGE_POISON if page poisoning is in use */
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__u32 poison_val;
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};
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#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
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#define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
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#define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */
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#define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */
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#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
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#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
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#define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */
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#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
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#define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */
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#define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */
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#define VIRTIO_BALLOON_S_NR 10
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#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
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VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
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VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \
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VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \
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VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \
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VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \
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VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \
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VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \
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VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
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VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
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VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \
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}
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#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")
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/*
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* Memory statistics structure.
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* Driver fills an array of these structures and passes to device.
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*
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* NOTE: fields are laid out in a way that would make compiler add padding
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* between and after fields, so we have to use compiler-specific attributes to
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* pack it, to disable this padding. This also often causes compiler to
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* generate suboptimal code.
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*
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* We maintain this statistics structure format for backwards compatibility,
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* but don't follow this example.
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*
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* If implementing a similar structure, do something like the below instead:
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* struct virtio_balloon_stat {
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* __virtio16 tag;
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* __u8 reserved[6];
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* __virtio64 val;
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* };
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*
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* In other words, add explicit reserved fields to align field and
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* structure boundaries at field size, avoiding compiler padding
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* without the packed attribute.
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*/
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struct virtio_balloon_stat {
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__virtio16 tag;
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__virtio64 val;
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} __attribute__((packed));
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#endif /* _LINUX_VIRTIO_BALLOON_H */
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