[PATCH 05/14] spapr/xive: Rework error handling of kvmppc_xive_cpu_[gs]et_state()

[Greg Kurz]

kvm_set_one_reg() returns a negative errno on failure, use that instead
of errno. Also propagate it to callers so they can use it to check
for failures and hopefully get rid of their local_err boilerplate.

Signed-off-by: Greg Kurz <gr...@kaod.org>
---
 hw/intc/spapr_xive_kvm.c |   15 ++++++++++-----
 include/hw/ppc/xive.h    |    4 ++--
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c
index b2a36fd59dae..5e088ccbf885 100644
--- a/hw/intc/spapr_xive_kvm.c
+++ b/hw/intc/spapr_xive_kvm.c
@@ -73,7 +73,7 @@ static void kvm_cpu_disable_all(void)
  * XIVE Thread Interrupt Management context (KVM)
  */
 
-void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
+int kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
 {
     SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
     uint64_t state[2];
@@ -86,13 +86,16 @@ void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
 
     ret = kvm_set_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
     if (ret != 0) {
-        error_setg_errno(errp, errno,
+        error_setg_errno(errp, -ret,
                          "XIVE: could not restore KVM state of CPU %ld",
                          kvm_arch_vcpu_id(tctx->cs));
+        return ret;
     }
+
+    return 0;
 }
 
-void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
+int kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
 {
     SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
     uint64_t state[2] = { 0 };
@@ -102,14 +105,16 @@ void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error 
**errp)
 
     ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
     if (ret != 0) {
-        error_setg_errno(errp, errno,
+        error_setg_errno(errp, -ret,
                          "XIVE: could not capture KVM state of CPU %ld",
                          kvm_arch_vcpu_id(tctx->cs));
-        return;
+        return ret;
     }
 
     /* word0 and word1 of the OS ring. */
     *((uint64_t *) &tctx->regs[TM_QW1_OS]) = state[0];
+
+    return 0;
 }
 
 typedef struct {
diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
index 2d87ed43728a..785c905357dc 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -489,7 +489,7 @@ int kvmppc_xive_source_reset_one(XiveSource *xsrc, int 
srcno, Error **errp);
 void kvmppc_xive_source_set_irq(void *opaque, int srcno, int val);
 int kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp);
 void kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp);
-void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp);
-void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp);
+int kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp);
+int kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp);
 
 #endif /* PPC_XIVE_H */