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| author | Peter Maydell <peter.maydell@linaro.org> | 2023-04-04 19:50:22 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2023-04-04 19:50:22 +0100 |
| commit | b5fba99ec7969054ab2f3727d2df014b5b72e4f1 (patch) | |
| tree | 392c8c8020d71878eed05164abf9db46c8a15eff | |
| parent | 7d0334e49111787ae19fbc8d29ff6e7347f0605e (diff) | |
| parent | 56adee407fc564da19e49cfe18e20e3da92320be (diff) | |
| download | qemu-b5fba99ec7969054ab2f3727d2df014b5b72e4f1.zip qemu-b5fba99ec7969054ab2f3727d2df014b5b72e4f1.tar.gz qemu-b5fba99ec7969054ab2f3727d2df014b5b72e4f1.tar.bz2 | |
Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging
Fix race condition that can cause a crash at startup.
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# gpg: Signature made Tue 04 Apr 2023 17:47:22 BST
# gpg: using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg: issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83
* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
kvm: dirty-ring: Fix race with vcpu creation
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | accel/kvm/kvm-all.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index f2a6ea6..cf3a88d 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -685,6 +685,15 @@ static uint32_t kvm_dirty_ring_reap_one(KVMState *s, CPUState *cpu) uint32_t ring_size = s->kvm_dirty_ring_size; uint32_t count = 0, fetch = cpu->kvm_fetch_index; + /* + * It's possible that we race with vcpu creation code where the vcpu is + * put onto the vcpus list but not yet initialized the dirty ring + * structures. If so, skip it. + */ + if (!cpu->created) { + return 0; + } + assert(dirty_gfns && ring_size); trace_kvm_dirty_ring_reap_vcpu(cpu->cpu_index); |