[PATCH 0/4] target/loongarch/kvm: cpucfg and device attr fixes

[Tao Cui <cui.tao@linux.dev>]

From: Tao Cui <cuitao@kylinos.cn>

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 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    | 39 ++++++++++++++++++-----------------
 target/loongarch/trace-events |  2 --
 2 files changed, 20 insertions(+), 21 deletions(-)

-- 
2.43.0