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b0c504f154
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>
100 lines
2.8 KiB
Plaintext
100 lines
2.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config VIRTIO
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tristate
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---help---
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This option is selected by any driver which implements the virtio
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bus, such as CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_RPMSG
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or CONFIG_S390_GUEST.
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menuconfig VIRTIO_MENU
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bool "Virtio drivers"
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default y
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if VIRTIO_MENU
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config VIRTIO_PCI
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tristate "PCI driver for virtio devices"
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depends on PCI
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select VIRTIO
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---help---
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This driver provides support for virtio based paravirtual device
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drivers over PCI. This requires that your VMM has appropriate PCI
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virtio backends. Most QEMU based VMMs should support these devices
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(like KVM or Xen).
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If unsure, say M.
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config VIRTIO_PCI_LEGACY
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bool "Support for legacy virtio draft 0.9.X and older devices"
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default y
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depends on VIRTIO_PCI
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---help---
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Virtio PCI Card 0.9.X Draft (circa 2014) and older device support.
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This option enables building a transitional driver, supporting
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both devices conforming to Virtio 1 specification, and legacy devices.
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If disabled, you get a slightly smaller, non-transitional driver,
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with no legacy compatibility.
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So look out into your driveway. Do you have a flying car? If
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so, you can happily disable this option and virtio will not
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break. Otherwise, leave it set. Unless you're testing what
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life will be like in The Future.
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If unsure, say Y.
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config VIRTIO_PMEM
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tristate "Support for virtio pmem driver"
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depends on VIRTIO
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depends on LIBNVDIMM
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help
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This driver provides access to virtio-pmem devices, storage devices
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that are mapped into the physical address space - similar to NVDIMMs
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- with a virtio-based flushing interface.
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If unsure, say Y.
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config VIRTIO_BALLOON
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tristate "Virtio balloon driver"
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depends on VIRTIO
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select MEMORY_BALLOON
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select PAGE_REPORTING
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---help---
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This driver supports increasing and decreasing the amount
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of memory within a KVM guest.
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If unsure, say M.
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config VIRTIO_INPUT
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tristate "Virtio input driver"
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depends on VIRTIO
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depends on INPUT
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---help---
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This driver supports virtio input devices such as
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keyboards, mice and tablets.
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If unsure, say M.
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config VIRTIO_MMIO
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tristate "Platform bus driver for memory mapped virtio devices"
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depends on HAS_IOMEM && HAS_DMA
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select VIRTIO
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---help---
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This drivers provides support for memory mapped virtio
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platform device driver.
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If unsure, say N.
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config VIRTIO_MMIO_CMDLINE_DEVICES
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bool "Memory mapped virtio devices parameter parsing"
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depends on VIRTIO_MMIO
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---help---
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Allow virtio-mmio devices instantiation via the kernel command line
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or module parameters. Be aware that using incorrect parameters (base
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address in particular) can crash your system - you have been warned.
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See Documentation/admin-guide/kernel-parameters.rst for details.
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If unsure, say 'N'.
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endif # VIRTIO_MENU
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