在 2026/6/26 下午1:27, Tao Cui 写道:
From: Tao Cui <[email protected]>
A few small robustness fixes around cpucfg register sync and kvm device
attribute handling in the LoongArch KVM target.
1/4: kvm_check_cpucfg2() discarded the return value of
KVM_GET_DEVICE_ATTR and used an uninitialized val to mask
cpucfg[2]; check the return value, warn and skip the mask on a GET
failure (best-effort negotiation), and initialize val.
2/4: kvm_get_stealtime(), kvm_set_stealtime() and kvm_set_pv_features()
pass a struct kvm_device_attr by value to the variadic
kvm_vcpu_ioctl(), which expects a pointer. Pass &attr.
3/4: drop the redundant trace_kvm_failed_get/put_cpucfg() calls and
their now-unused trace events; kvm_get/set_one_reg() already trace
on failure.
4/4: kvm_loongarch_get/put_cpucfg() overwrite ret on each iteration, so
only the last register's result is returned and earlier failures
are lost; on a failed read, get_cpucfg() also stores a stale val.
Accumulate errors with ret |= and only store on a successful read.
Compiled and boot-tested on a loongarch64 KVM host.
Tao Cui (4):
target/loongarch/kvm: fix uninitialized val and unchecked GET in
cpucfg2 check
target/loongarch/kvm: pass device attr by reference to kvm_vcpu_ioctl
target/loongarch/kvm: remove redundant cpucfg failure traces
target/loongarch/kvm: fix cpucfg sync error handling
target/loongarch/kvm/kvm.c | 46 ++++++++++++++++++++---------------
target/loongarch/trace-events | 2 --
2 files changed, 26 insertions(+), 22 deletions(-)
---
Applied to loongarch-next.
Thanks.
Song Gao
Changes in v2:
- 1/4: on KVM_GET_DEVICE_ATTR failure, warn and skip the cpucfg2 mask
instead of failing the register sync; the &= mask is best-effort, and a
GET failure after a successful HAS is most likely a copy_{from,to}_user
issue. Switched the report from error_report() to warn_report().
