[PATCH v2 1/2] target/riscv/kvm: improve 'init_multiext_cfg' error msg

[Daniel Henrique Barboza]

Our error message is returning the value of 'ret', which will be always
-1 in case of error, and will not be that useful:

qemu-system-riscv64: Unable to read ISA_EXT KVM register ssaia, error -1

Improve the error message by outputting 'errno' instead of 'ret'. Use
strerrorname_np() to output the error name instead of the error code.
This will give us what we need to know right away:

qemu-system-riscv64: Unable to read ISA_EXT KVM register ssaia, error code: 
ENOENT

Given that we're going to exit(1) in this condition instead of
attempting to recover, remove the 'kvm_riscv_destroy_scratch_vcpu()'
call.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
 target/riscv/kvm/kvm-cpu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index c6615cb807..c3daf74fe9 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -792,8 +792,8 @@ static void kvm_riscv_init_multiext_cfg(RISCVCPU *cpu, 
KVMScratchCPU *kvmcpu)
                 val = false;
             } else {
                 error_report("Unable to read ISA_EXT KVM register %s, "
-                             "error %d", multi_ext_cfg->name, ret);
-                kvm_riscv_destroy_scratch_vcpu(kvmcpu);
+                             "error code: %s", multi_ext_cfg->name,
+                             strerrorname_np(errno));
                 exit(EXIT_FAILURE);
             }
         } else {
-- 
2.41.0