[Qemu-ppc] [RFC PATCH v2 14/21] ppc/xive: add support for the SET_OS_PENDING command

[Cédric Le Goater]

Adjusting the Interrupt Pending Buffer for the O/S would allow a CPU
to process event queues of other priorities during one physical
interrupt cycle. This is not currently used by the XIVE support for
sPAPR in Linux but it is by the hypervisor.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 hw/intc/spapr_xive.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index ad3ff91b13ea..ad3f03e37401 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -162,7 +162,14 @@ static bool spapr_xive_tm_is_readonly(uint8_t index)
 static void spapr_xive_tm_write_special(ICPState *icp, hwaddr offset,
                                   uint64_t value, unsigned size)
 {
-    /* TODO: support TM_SPC_SET_OS_PENDING */
+    if (offset == TM_SPC_SET_OS_PENDING && size == 1) {
+        icp->tima_os[TM_IPB] |= priority_to_ipb(value & 0xff);
+        icp->tima_os[TM_PIPR] = ipb_to_pipr(icp->tima_os[TM_IPB]);
+        spapr_xive_icp_notify(icp);
+    } else {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid TIMA write @%"
+                      HWADDR_PRIx" size %d\n", offset, size);
+    }
 
     /* TODO: support TM_SPC_ACK_OS_EL */
 }
-- 
2.13.5