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David Hildenbrand 6cc26d7761 virtio-mem: use page_offline_(start|end) when setting PageOffline() 
Let's properly use page_offline_(start|end) to synchronize setting
PageOffline(), so we won't have valid page access to unplugged memory
regions from /proc/kcore.

Existing balloon implementations usually allow reading inflated memory;
doing so might result in unnecessary overhead in the hypervisor, which is
currently the case with virtio-mem.

For future virtio-mem use cases, it will be different when using shmem,
huge pages, !anonymous private mappings, ...  as backing storage for a VM.
virtio-mem unplugged memory must no longer be accessed and access might
result in undefined behavior.  There will be a virtio spec extension to
document this change, including a new feature flag indicating the changed
behavior.  We really don't want to race against PFN walkers reading random
page content.

Link: https://lkml.kernel.org/r/20210526093041.8800-6-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Aili Yao <yaoaili@kingsoft.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Jiri Bohac <jbohac@suse.cz>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2021-06-30 20:47:28 -07:00
..
accessibility TTY/Serial driver updates for 5.13-rc1 2021-04-26 11:20:10 -07:00
acpi Merge branch 'acpi-bus' 2021-06-11 17:57:24 +02:00
amba
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android binder: Return EFAULT if we fail BINDER_ENABLE_ONEWAY_SPAM_DETECTION 2021-05-13 20:35:26 +02:00
ata pci-v5.13-changes 2021-05-05 13:24:11 -07:00
atm atm: firestream: Use fallthrough pseudo-keyword 2021-05-07 16:01:08 -07:00
auxdisplay treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
base mm/vmstat: convert NUMA statistics to basic NUMA counters 2021-06-29 10:53:54 -07:00
bcma
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block loop: charge i/o to mem and blk cg 2021-06-29 10:53:50 -07:00
bluetooth Networking fixes for 5.13-rc5, including fixes from bpf, wireless, 2021-06-04 18:25:39 -07:00
bus Char/Misc driver fixes for 5.13-rc6 2021-06-12 12:13:55 -07:00
cdrom cdrom: gdrom: initialize global variable at init time 2021-05-13 18:58:44 +02:00
char Char/misc driver fixes for 5.13-rc3 2021-05-20 06:31:52 -10:00
clk clk: Skip clk provider registration when np is NULL 2021-05-11 08:47:25 +02:00
clocksource clocksource/drivers/hyper-v: Re-enable VDSO_CLOCKMODE_HVCLOCK on X86 2021-05-14 14:55:13 +02:00
comedi
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connector
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counter
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cpufreq Revert "cpufreq: CPPC: Add support for frequency invariance" 2021-06-14 15:55:02 +02:00
cpuidle
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crypto Revert "crypto: cavium/nitrox - add an error message to explain the failure of pci_request_mem_regions" 2021-05-13 17:23:05 +02:00
cxl
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dax fs: remove noop_set_page_dirty() 2021-06-29 10:53:48 -07:00
dca
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devfreq
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dio
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dma dmaengine fixes for v5.13 2021-06-16 09:03:52 -07:00
dma-buf dma-buf: fix unintended pin/unpin warnings 2021-05-20 14:02:27 +02:00
edac x86/msr: Rename MSR_K8_SYSCFG to MSR_AMD64_SYSCFG 2021-05-10 07:51:38 +02:00
eisa
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extcon - Core Frameworks 2021-04-28 15:59:13 -07:00
firewire The usual updates from the irq departement: 2021-04-26 09:43:16 -07:00
firmware EFI fixes for v5.13-rc 2021-05-23 11:39:02 +02:00
fpga ARM: SoC drivers for v5.13 2021-04-26 12:11:52 -07:00
fsi
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gnss
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gpio gpio: AMD8111 and TQMX86 require HAS_IOPORT_MAP 2021-06-25 12:13:53 +02:00
gpu drm/amdgpu: use vma_lookup() in amdgpu_ttm_tt_get_user_pages() 2021-06-29 10:53:51 -07:00
greybus
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hid HID: asus: Cleanup Asus T101HA keyboard-dock handling 2021-05-27 15:40:35 +02:00
hsi
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hv printk changes for 5.13 2021-04-27 18:09:44 -07:00
hwmon hwmon: (tps23861) correct shunt LSB values 2021-06-10 08:40:09 -07:00
hwspinlock
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hwtracing ARM: 2021-05-01 10:14:08 -07:00
i2c i2c: robotfuzz-osif: fix control-request directions 2021-06-24 22:08:00 +02:00
i3c Revert "i3c master: fix missing destroy_workqueue() on error in i3c_master_register" 2021-04-24 22:21:01 +02:00
ide
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idle
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iio iio: adc: ad7793: Add missing error code in ad7793_setup() 2021-05-22 08:32:36 +01:00
infiniband IB/mlx5: Fix initializing CQ fragments buffer 2021-06-10 08:59:34 -03:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2021-05-06 23:37:55 -07:00
interconnect interconnect: qcom: Add missing MODULE_DEVICE_TABLE 2021-05-11 07:26:31 +03:00
iommu iommu/vt-d: Fix sysfs leak in alloc_iommu() 2021-05-27 16:07:08 +02:00
ipack
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irqchip irqchip fixes for 5.13, take #2 2021-06-17 15:22:31 +02:00
isdn Networking fixes for 5.13-rc4, including fixes from bpf, netfilter, 2021-05-26 17:44:49 -10:00
leds leds: lp5523: check return value of lp5xx_read and jump to cleanup code 2021-05-13 17:30:15 +02:00
lightnvm
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macintosh
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mailbox - qcom: enable support for SM8350 and SC7280 2021-04-28 16:10:33 -07:00
mcb
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md block-5.13-2021-06-12 2021-06-12 11:59:58 -07:00
media media: videobuf2: use vma_lookup() in get_vaddr_frames() 2021-06-29 10:53:51 -07:00
memory .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
memstick memstick: r592: ignore kfifo_out() return code again 2021-04-26 11:08:23 +02:00
message
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mfd - Core Frameworks 2021-04-28 15:59:13 -07:00
misc misc/sgi-gru/grufault: use vma_lookup() in gru_find_vma() 2021-06-29 10:53:51 -07:00
mmc mmc: meson-gx: use memcpy_to/fromio for dram-access-quirk 2021-06-14 14:02:33 +02:00
most Staging/IIO driver updates for 5.13-rc1 2021-04-26 11:14:21 -07:00
mtd mtd: parsers: ofpart: fix parsing subpartitions 2021-05-10 18:34:30 +02:00
mux
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net Networking fixes for 5.13-rc7, including fixes from wireless, bpf, 2021-06-18 18:55:29 -07:00
nfc NFC: nfcmrvl: fix kernel-doc syntax in file headers 2021-05-23 17:26:38 -07:00
ntb
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nubus
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nvdimm include: remove pagemap.h from blkdev.h 2021-05-06 19:24:11 -07:00
nvme nvmet: fix freeing unallocated p2pmem 2021-06-02 10:10:38 +03:00
nvmem
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of of: overlay: Remove redundant assignment to ret 2021-05-03 13:57:56 -05:00
opp
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parisc
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parport treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
pci Revert "PCI: PM: Do not read power state in pci_enable_device_flags()" 2021-06-22 17:35:18 +02:00
pcmcia
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perf ARM: 2021-05-01 10:14:08 -07:00
phy phy: Sparx5 Eth SerDes: check return value after calling platform_get_resource() 2021-06-03 11:18:19 +05:30
pinctrl pinctrl: stm32: fix the reported number of GPIO lines per bank 2021-06-18 14:56:54 +02:00
platform platform/mellanox: mlxreg-hotplug: Revert "move to use request_irq by IRQF_NO_AUTOEN flag" 2021-06-04 22:03:13 +02:00
pnp
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power power supply and reset changes for the v5.13 series 2021-04-28 15:43:58 -07:00
powercap
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pps TTY/Serial driver updates for 5.13-rc1 2021-04-26 11:20:10 -07:00
ps3
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ptp ptp: improve max_adj check against unreasonable values 2021-06-15 10:59:46 -07:00
pwm pwm: Changes for v5.13-rc1 2021-05-05 12:53:16 -07:00
rapidio rapidio: handle create_workqueue() failure 2021-05-13 18:32:19 +02:00
ras
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regulator regulator: Fixes for v5.14 2021-06-08 09:41:16 -07:00
remoteproc remoteproc updates for v5.13 2021-05-04 11:13:33 -07:00
reset pci-v5.13-changes 2021-05-05 13:24:11 -07:00
rpmsg
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rtc RTC for 5.13 2021-05-03 12:15:21 -07:00
s390 s390/vfio-ap: clean up mdev resources when remove callback invoked 2021-06-21 11:19:18 +02:00
sbus
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scsi SCSI fixes on 20210625 2021-06-25 15:59:14 -07:00
sh The usual updates from the irq departement: 2021-04-26 09:43:16 -07:00
siox
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slimbus
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soc soc: amlogic: meson-clk-measure: remove redundant dev_err call in meson_msr_probe() 2021-05-31 09:26:58 +02:00
soundwire soundwire: qcom: fix handling of qcom,ports-block-pack-mode 2021-05-13 11:14:13 +05:30
spi spi: spi-nxp-fspi: move the register operation after the clock enable 2021-06-14 15:02:01 +01:00
spmi
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ssb
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staging Networking fixes for 5.13-rc7, including fixes from wireless, bpf, 2021-06-18 18:55:29 -07:00
target scsi: target: core: Fix warning on realtime kernels 2021-05-31 22:59:13 -04:00
tc
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tee OP-TEE use export_uuid() to copy UUID 2021-06-05 15:43:11 -07:00
thermal - Fix out-of-spec hardware (1st gen Hygon) which does not implement 2021-06-06 12:25:43 -07:00
thunderbolt thunderbolt: usb4: Fix NVM read buffer bounds and offset issue 2021-05-20 11:52:58 +03:00
tty serial: 8250_exar: Avoid NULL pointer dereference at ->exit() 2021-06-09 14:40:48 +02:00
uio uio_hv_generic: Fix another memory leak in error handling paths 2021-05-14 13:26:04 +02:00
usb usb: core: hub: Disable autosuspend for Cypress CY7C65632 2021-06-17 15:34:21 +02:00
vdpa {net,vdpa}/mlx5: Configure interface MAC into mpfs L2 table 2021-05-18 23:01:48 -07:00
vfio vfio: use vma_lookup() instead of find_vma_intersection() 2021-06-29 10:53:51 -07:00
vhost virtio,vhost,vdpa: features, fixes 2021-05-05 13:31:39 -07:00
video Revert "fb_defio: Remove custom address_space_operations" 2021-06-01 17:38:40 +02:00
virt nitro_enclaves: Fix stale file descriptors on failed usercopy 2021-04-29 19:06:49 +02:00
virtio virtio-mem: use page_offline_(start|end) when setting PageOffline() 2021-06-30 20:47:28 -07:00
visorbus
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vlynq
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vme
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w1
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watchdog - Core Frameworks 2021-04-28 15:59:13 -07:00
xen xen/events: reset active flag for lateeoi events later 2021-06-24 12:52:36 +02:00
zorro
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Kconfig
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Makefile virtio,vhost,vdpa: features, fixes 2021-05-05 13:31:39 -07:00