| commit | 52896bd9c819c71a411d56416a45087c7df0df19 | |
| author | Marcelo Tosatti <mtosatti@redhat.com> | |
| Fri, 22 Aug 2008 23:03:35 +0000 (22 20:03 -0300) | ||
| committer | Avi Kivity <avi@qumranet.com> | |
| Mon, 25 Aug 2008 10:20:36 +0000 (25 13:20 +0300) | ||
| tree | a4a3f53e5ba2976cd32d5c8072149a9bbf208152 | treesnapshot (tar.gz zip) |
| parent | 501797e19c7282e9579686bd80feff3754a7ccca | commitdiff |
kvm: qemu: mark guest mapping as MADV_DONTFORK
When qemu fork's (ssh migration, qemu-nbd, slirp), the guest memory
mapping becomes shared and write-protected by parent and child, until
execve switches to a new mm.
get_user_pages with force=1 parameter will break COW during this window,
leaving stale shadow mappings that point to the previously shared page.
Fix this by madvising the range as MADV_DONTFORK, if mmu notifiers are
disabled.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
When qemu fork's (ssh migration, qemu-nbd, slirp), the guest memory
mapping becomes shared and write-protected by parent and child, until
execve switches to a new mm.
get_user_pages with force=1 parameter will break COW during this window,
leaving stale shadow mappings that point to the previously shared page.
Fix this by madvising the range as MADV_DONTFORK, if mmu notifiers are
disabled.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
| qemu/qemu-kvm.c | diffblobblamehistory | |
| qemu/qemu-kvm.h | diffblobblamehistory | |
| qemu/vl.c | diffblobblamehistory |