ppc: spapr: Handle "ibm,nmi-register" and "ibm,nmi-interlock" RTAS calls

This patch adds support in QEMU to handle "ibm,nmi-register"
and "ibm,nmi-interlock" RTAS calls.

The machine check notification address is saved when the
OS issues "ibm,nmi-register" RTAS call.

This patch also handles the case when multiple processors
experience machine check at or about the same time by
handling "ibm,nmi-interlock" call. In such cases, as per
PAPR, subsequent processors serialize waiting for the first
processor to issue the "ibm,nmi-interlock" call. The second
processor that also received a machine check error waits
till the first processor is done reading the error log.
The first processor issues "ibm,nmi-interlock" call
when the error log is consumed.

Signed-off-by: Aravinda Prasad <arawinda.p@gmail.com>
[Register fwnmi RTAS calls in core_rtas_register_types()
 where other RTAS calls are registered]
Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Message-Id: <20200130184423.20519-6-ganeshgr@linux.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 10 insertions, 0 deletions

diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 393ee6845e..8b27d3ac09 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -515,6 +515,16 @@ static void cap_fwnmi_mce_apply(SpaprMachineState *spapr, uint8_t val,
     if (!val) {
         return; /* Disabled by default */
     }
+
+    if (tcg_enabled()) {
+        warn_report("Firmware Assisted Non-Maskable Interrupts(FWNMI) not "
+                    "supported in TCG");
+    } else if (kvm_enabled()) {
+        if (kvmppc_set_fwnmi() < 0) {
+            error_setg(errp, "Firmware Assisted Non-Maskable Interrupts(FWNMI) "
+                             "not supported by KVM");
+        }
+    }
 }
 
 SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = {