Re: [PATCH v3 0/7] Improve traces on migration failure due to cpreg number mismatch
On Wed, 4 Mar 2026 at 10:16, Eric Auger wrote: > > This series comes as a follow-up of discussions held in > [PATCH v6 00/11] Mitigation of "failed to load > cpu:cpreg_vmstate_array_len" migration failures > (https://lore.kernel.org/all/[email protected]/) > > It only covers the improvement of the traces. Actual mitigations > are handled in a follow-up series: > Mitigation of "failed to load cpu:cpreg_vmstate_array_len" (v8) > > When the number of CPU registers received in an incoming migration > stream is bigger than the number of CPU registers seen by the > destination we currently get the following error: > > "failed to load cpu:cpreg_vmstate_array_len" > > This series removes this cryptic message and explicitly outputs > which spurious registers cause the failures. > > --- Applied to target-arm.next, thanks. -- PMM
[PATCH v3 0/7] Improve traces on migration failure due to cpreg number mismatch
This series comes as a follow-up of discussions held in [PATCH v6 00/11] Mitigation of "failed to load cpu:cpreg_vmstate_array_len" migration failures (https://lore.kernel.org/all/[email protected]/) It only covers the improvement of the traces. Actual mitigations are handled in a follow-up series: Mitigation of "failed to load cpu:cpreg_vmstate_array_len" (v8) When the number of CPU registers received in an incoming migration stream is bigger than the number of CPU registers seen by the destination we currently get the following error: "failed to load cpu:cpreg_vmstate_array_len" This series removes this cryptic message and explicitly outputs which spurious registers cause the failures. --- Available at: https://github.com/eauger/qemu/tree/cpreg_vmstate_array_len_traces_v3_mitig_v2 v2 -> v3: - clear the vmstate array pointers on post_save() - improve the print_register_name comment - Collecting remaining R-b's v1 -> v2: - Tool all comments from Peter on v1. See individual history logs - Also added last patch which was previously included in the follow-up mitigation series ([PATCH v7 0/7] Mitigation of "failed to load cpu:cpreg_vmstate_array_len" migration failures) but actually belongs to those functional changes. Eric Auger (7): vmstate: Introduce VMSTATE_VARRAY_INT32_ALLOC target/arm/machine: Use VMSTATE_VARRAY_INT32_ALLOC for cpreg arrays target/arm/kvm: Export kvm_print_register_name() target/arm/kvm: Tweak print_register_name() for arm64 system register target/arm/machine: Trace cpreg names which do not match on migration target/arm/machine: Trace all register mismatches target/arm/machine: Fix detection of unknown incoming cpregs include/migration/vmstate.h | 10 target/arm/kvm_arm.h| 9 +++ target/arm/helper.c | 5 -- target/arm/kvm-stub.c | 5 ++ target/arm/kvm.c| 9 +-- target/arm/machine.c| 115 ++-- target/arm/whpx/whpx-all.c | 7 --- target/arm/trace-events | 3 + 8 files changed, 127 insertions(+), 36 deletions(-) -- 2.53.0
