[Qemu-devel] [PATCH 0/3] target-i386: kvm: Use env->mcg_cap when setting up MCE

[Eduardo Habkost]

Instead of overwriting env->mcg_cap, make kvm_arch_init_vcpu(),
use the value already set at the CPU object when initializing
MCE.

Except for the new "unsupported MCG_CAPS bits" warning, this
patch doesn't change any of the existing QEMU behavior. The
previous code set env->mcg_cap to:
  (MCE_CAP_DEF & ioctl(KVM_X86_GET_MCE_CAP_SUPPORTED)) | MCE_BANKS_DEF
and the new code still keeps it exactly the same, as env->mcg_cap
is already initialized as MCE_CAP_DEF|MCE_BANKS_DEF at
mce_init().

This will allow us to change mce_init() in the future, to
implement different defaults depending on CPU model, machine-type
or command-line parameters.

Eduardo Habkost (3):
  target-i386: kvm: Abort if MCE bank count is not supported by host
  target-i386: kvm: Use env->mcg_cap when setting up MCE
  target-i386: kvm: Print warning when clearing mcg_cap bits

 target-i386/cpu.h |  2 ++
 target-i386/kvm.c | 22 ++++++++++++++--------
 2 files changed, 16 insertions(+), 8 deletions(-)

-- 
2.1.0