[PATCH v3 0/1] spapr.c: set a 'kvm-type' default value instead of relying on NULL

[Daniel Henrique Barboza <danielhb413@gmail.com>]

changes from v2, all proposed by Greg:
* Handle 'NULL' value as default mode fallback in spapr_kvm_type()
* Do not allow for 'AUTO' to be a valid mode in spapr_kvm_type()
* Initialize 'spapr->kvm_type' in spapr_instance_init() like Paolo
  proposed. This will spare us from changing spapr_get_kvm_type()
  altogether.
v2 link: https://lists.gnu.org/archive/html/qemu-devel/2020-12/msg02623.html


This patch addresses an issue that happens with the pseries machine after
testing Paolo's patch [1]:

$ sudo ./ppc64-softmmu/qemu-system-ppc64 -nographic -nodefaults -machine pseries --enable-kvm
qemu-system-ppc64: Unknown kvm-type specified '' 

The reason lies on how qemu_opt_get() and object_property_get_str() works
when there is no 'kvm-type' specified. We were conting on receiving NULL
for kvm-type, but the latter will use a blank string "". Instead on relying
on NULL, let's expose the already existing 'auto' kvm-type mode to the users
and use that as default.

[1] https://lists.gnu.org/archive/html/qemu-devel/2020-12/msg00471.html

Daniel Henrique Barboza (1):
  spapr.c: set a 'kvm-type' default value instead of relying on NULL

 hw/ppc/spapr.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

-- 
2.26.2