- 28 2月, 2017 7 次提交
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由 Dr. David Alan Gilbert 提交于
As an extra sanity check, make sure the region we're registering can perform UFFDIO_COPY; the COPY will fail later but this gives a cleaner failure. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-17-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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由 Dr. David Alan Gilbert 提交于
We need extra Linux kernel support (~4.11) to support userfaults on hugetlbfs; check for them. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-15-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Allow huge pages in postcopy. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-13-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Currently the fault address received by userfault is rounded to the host page boundary and a host page is requested from the source. Use the current RAMBlock page size instead of the general host page size so that for RAMBlocks backed by huge pages we request the whole huge page. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-11-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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由 Dr. David Alan Gilbert 提交于
The kernel can't do UFFDIO_ZEROPAGE for huge pages, so we have to allocate a temporary (always zero) page and use UFFDIO_COPYPAGE on it. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-9-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Now we deal with normal size pages and huge pages we need to tell the place handlers the size we're dealing with and make sure the temporary page is large enough. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-8-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Create ram_block_discard_range in exec.c to replace postcopy_ram_discard_range and most of ram_discard_range. Those two routines are a bit of a weird combination, and ram_discard_range is about to get more complex for hugepages. It's OS dependent code (so shouldn't be in migration/ram.c) but it needs quite a bit of the innards of RAMBlock so doesn't belong in the os*.c. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NLaurent Vivier <lvivier@redhat.com> Message-Id: <20170224182844.32452-5-dgilbert@redhat.com> Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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- 13 10月, 2016 1 次提交
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由 Dr. David Alan Gilbert 提交于
At the moment postcopy will fail as soon as qemu tries to register userfault on the RAMBlock pages that are backed by hugepages. However, the kernel is going to get userfault support for hugepage at some point, and we've not got the rest of the QEMU code to support it yet, so fail neatly with an error like: Postcopy doesn't support hugetlbfs yet (/objects/mem1) Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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- 11 8月, 2016 1 次提交
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由 Evgeny Yakovlev 提交于
mmap man page: "On success, mmap() returns a pointer to the mapped area. On error, the value MAP_FAILED (that is, (void *) -1) is returned, and errno is set to indicate the cause of the error." The check in postcopy_get_tmp_page is definitely wrong and should be fixed. Signed-off-by: NEvgeny Yakovlev <eyakovlev@virtuozzo.com> Signed-off-by: NDenis V. Lunev <den@openvz.org> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com> CC: Juan Quintela <quintela@redhat.com> CC: Amit Shah <amit.shah@redhat.com> Message-Id: <1469785705-16670-1-git-send-email-den@openvz.org> Signed-off-by: NAmit Shah <amit.shah@redhat.com>
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- 17 6月, 2016 1 次提交
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由 Paolo Bonzini 提交于
qemu/osdep.h checks whether MAP_ANONYMOUS is defined, but this check is bogus without a previous inclusion of sys/mman.h. Include it in sysemu/os-posix.h and remove it from everywhere else. Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 07 6月, 2016 1 次提交
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由 Peter Maydell 提交于
Remove glib.h includes, as it is provided by osdep.h. This commit was created with scripts/clean-includes. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NEric Blake <eblake@redhat.com> Tested-by: NEric Blake <eblake@redhat.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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- 29 5月, 2016 1 次提交
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由 Paolo Bonzini 提交于
Of the two callers, one does not use it, and the other can compute it itself based on the other output argument (offset) and the RAMBlock. Reviewed-by: NMarc-André Lureau <marcandre.lureau@gmail.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 26 2月, 2016 1 次提交
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由 Matthew Fortune 提交于
sys/eventfd.h was being guarded only by a check for linux but does not exist on older distributions like CentOS 5. Move the include into the code that uses it and add an appropriate guard. Signed-off-by: NMatthew Fortune <matthew.fortune@imgtec.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Message-Id: <6D39441BF12EF246A7ABCE6654B023536BB85DEB@hhmail02.hh.imgtec.org> Signed-off-by: NAmit Shah <amit.shah@redhat.com>
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- 05 2月, 2016 1 次提交
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由 zhanghailiang 提交于
Rename the 'file' member of MigrationState to 'to_dst_file' to be consistent with to_src_file, from_src_file and from_dst_file. Signed-off-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com> Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Message-Id: <1452829066-9764-3-git-send-email-zhang.zhanghailiang@huawei.com> Signed-off-by: NAmit Shah <amit.shah@redhat.com>
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- 29 1月, 2016 1 次提交
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由 Peter Maydell 提交于
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Message-id: 1453832250-766-2-git-send-email-peter.maydell@linaro.org
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- 25 11月, 2015 1 次提交
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由 Dr. David Alan Gilbert 提交于
madvise() returns EINVAL in the case of many failures, but also returns it in cases where the host kernel doesn't have THP enabled. Postcopy only really cares that THP is off before it detects faults, and turns it back on afterwards; so we're going to have to assume that if the madvise fails then the host just doesn't do THP and we can carry on with the postcopy. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Tested-by: NJason J. Herne <jjherne@linux.vnet.ibm.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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- 10 11月, 2015 9 次提交
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由 Dr. David Alan Gilbert 提交于
Postcopy detects accesses to pages that haven't been transferred yet using userfaultfd, and it causes exceptions on pages that are 'not present'. Ballooning also causes pages to be marked as 'not present' when the guest inflates the balloon. Potentially a balloon could be inflated to discard pages that are currently inflight during postcopy and that may be arriving at about the same time. To avoid this confusion, disable ballooning during postcopy. When disabled we drop balloon requests from the guest. Since ballooning is generally initiated by the host, the management system should avoid initiating any balloon instructions to the guest during migration, although it's not possible to know how long it would take a guest to process a request made prior to the start of migration. Guest initiated ballooning will not know if it's really freed a page of host memory or not. Queueing the requests until after migration would be nice, but is non-trivial, since the set of inflate/deflate requests have to be compared with the state of the page to know what the final outcome is allowed to be. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Userfault doesn't work with mlock; mlock is designed to nail down pages so they don't move, userfault is designed to tell you when they're not there. munlock the pages we userfault protect before postcopy. mlock everything again at the end if mlock is enabled. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Prior to servicing userfault requests we must ensure we've not got huge pages in the area that might include non-transferred memory, since a hugepage could incorrectly mark the whole huge page as present. We mark the area as non-huge page (nhp) just before we perform discards; the discard code now tells us to discard any areas that haven't been sent (as well as any that are redirtied); any already formed transparent-huge-pages get fragmented by this discard process if they cotnain any discards. Transparent huge pages that have been entirely transferred and don't contain any discards are not broken by this mechanism; they stay as huge pages. By starting postcopy after a full precopy pass, many of the pages then stay as huge pages; this is important for maintaining performance after the end of the migration. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
userfaultfd is a Linux syscall that gives an fd that receives a stream of notifications of accesses to pages registered with it and allows the program to acknowledge those stalls and tell the accessing thread to carry on. We convert the requests from the kernel into messages back to the source asking for the pages. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
postcopy_place_page (etc) provide a way for postcopy to place a page into guests memory atomically (using the copy ioctl on the ufd). Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Mark the area of RAM as 'userfault' Start up a fault-thread to handle any userfaults we might receive from it (to be filled in later) Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Soon we'll be in either ACTIVE or POSTCOPY_ACTIVE when we complete migration, and we need to know which we expect to be in to change state safely. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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由 Dr. David Alan Gilbert 提交于
Provide a check to see if the OS we're running on has all the bits needed for postcopy. Creates postcopy-ram.c which will get most of the other helpers we need. Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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