diff options
| author | Peter Xu <peterx@redhat.com> | 2023-02-17 00:18:32 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-04-04 18:46:46 +0200 |
| commit | 56adee407fc564da19e49cfe18e20e3da92320be (patch) | |
| tree | bc9b62476258378ed2f6713315af295b7d42804a /linux-headers/asm-generic | |
| parent | f00506aeca2f6d92318967693f8da8c713c163f3 (diff) | |
| download | qemu-56adee407fc564da19e49cfe18e20e3da92320be.zip qemu-56adee407fc564da19e49cfe18e20e3da92320be.tar.gz qemu-56adee407fc564da19e49cfe18e20e3da92320be.tar.bz2 | |
kvm: dirty-ring: Fix race with vcpu creation
It's possible that we want to reap a dirty ring on a vcpu that is during
creation, because the vcpu is put onto list (CPU_FOREACH visible) before
initialization of the structures. In this case:
qemu_init_vcpu
x86_cpu_realizefn
cpu_exec_realizefn
cpu_list_add <---- can be probed by CPU_FOREACH
qemu_init_vcpu
cpus_accel->create_vcpu_thread(cpu);
kvm_init_vcpu
map kvm_dirty_gfns <--- kvm_dirty_gfns valid
Don't try to reap dirty ring on vcpus during creation or it'll crash.
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2124756
Reported-by: Xiaohui Li <xiaohli@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1d14deb6684bcb7de1c9633c5bd21113988cc698.1676563222.git.huangy81@chinatelecom.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'linux-headers/asm-generic')
0 files changed, 0 insertions, 0 deletions