ppc/xive2: add interrupt priority configuration flags

Adds support for extracting additional configuration flags from
the XIVE configuration register that are needed for redistribution
of group interrupts.

Signed-off-by: Glenn Miles <milesg@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Michael Kowal <kowal@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-22-npiggin@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/intc/pnv_xive2.c b/hw/intc/pnv_xive2.c
index 386175a68b292dc66370d58826336007d3369b47..7b4a33228e0506ceac46961795e07ee34d466847 100644 (file)
--- a/hw/intc/pnv_xive2.c
+++ b/hw/intc/pnv_xive2.c
@@ -605,20 +605,28 @@ static uint32_t pnv_xive2_get_config(Xive2Router *xrtr)
 {
     PnvXive2 *xive = PNV_XIVE2(xrtr);
     uint32_t cfg = 0;
+    uint64_t reg = xive->cq_regs[CQ_XIVE_CFG >> 3];
 
-    if (xive->cq_regs[CQ_XIVE_CFG >> 3] & CQ_XIVE_CFG_GEN1_TIMA_OS) {
+    if (reg & CQ_XIVE_CFG_GEN1_TIMA_OS) {
         cfg |= XIVE2_GEN1_TIMA_OS;
     }
 
-    if (xive->cq_regs[CQ_XIVE_CFG >> 3] & CQ_XIVE_CFG_EN_VP_SAVE_RESTORE) {
+    if (reg & CQ_XIVE_CFG_EN_VP_SAVE_RESTORE) {
         cfg |= XIVE2_VP_SAVE_RESTORE;
     }
 
-    if (GETFIELD(CQ_XIVE_CFG_HYP_HARD_RANGE,
-              xive->cq_regs[CQ_XIVE_CFG >> 3]) == CQ_XIVE_CFG_THREADID_8BITS) {
+    if (GETFIELD(CQ_XIVE_CFG_HYP_HARD_RANGE, reg) ==
+                      CQ_XIVE_CFG_THREADID_8BITS) {
         cfg |= XIVE2_THREADID_8BITS;
     }
 
+    if (reg & CQ_XIVE_CFG_EN_VP_GRP_PRIORITY) {
+        cfg |= XIVE2_EN_VP_GRP_PRIORITY;
+    }
+
+    cfg = SETFIELD(XIVE2_VP_INT_PRIO, cfg,
+                   GETFIELD(CQ_XIVE_CFG_VP_INT_PRIO, reg));
+
     return cfg;
 }
 

diff --git a/hw/intc/pnv_xive2_regs.h b/hw/intc/pnv_xive2_regs.h
index e8b87b3d2c13557c2956b222da6787b424d0e5a5..d53300f709b04c41dee84b03e3aab885b313f7f9 100644 (file)
--- a/hw/intc/pnv_xive2_regs.h
+++ b/hw/intc/pnv_xive2_regs.h
@@ -66,6 +66,7 @@
 #define    CQ_XIVE_CFG_GEN1_TIMA_HYP_BLK0       PPC_BIT(26) /* 0 if bit[25]=0 */
 #define    CQ_XIVE_CFG_GEN1_TIMA_CROWD_DIS      PPC_BIT(27) /* 0 if bit[25]=0 */
 #define    CQ_XIVE_CFG_GEN1_END_ESX             PPC_BIT(28)
+#define    CQ_XIVE_CFG_EN_VP_GRP_PRIORITY       PPC_BIT(32) /* 0 if bit[25]=1 */
 #define    CQ_XIVE_CFG_EN_VP_SAVE_RESTORE       PPC_BIT(38) /* 0 if bit[25]=1 */
 #define    CQ_XIVE_CFG_EN_VP_SAVE_REST_STRICT   PPC_BIT(39) /* 0 if bit[25]=1 */
 

diff --git a/include/hw/ppc/xive2.h b/include/hw/ppc/xive2.h
index 2436ddb5e53cf7baf4a6e295426085d54ab30b9d..760b94a962e73b7d41905d1f456a475f0f7fff14 100644 (file)
--- a/include/hw/ppc/xive2.h
+++ b/include/hw/ppc/xive2.h
@@ -29,9 +29,11 @@ OBJECT_DECLARE_TYPE(Xive2Router, Xive2RouterClass, XIVE2_ROUTER);
  * Configuration flags
  */
 
-#define XIVE2_GEN1_TIMA_OS      0x00000001
-#define XIVE2_VP_SAVE_RESTORE   0x00000002
-#define XIVE2_THREADID_8BITS    0x00000004
+#define XIVE2_GEN1_TIMA_OS          0x00000001
+#define XIVE2_VP_SAVE_RESTORE       0x00000002
+#define XIVE2_THREADID_8BITS        0x00000004
+#define XIVE2_EN_VP_GRP_PRIORITY    0x00000008
+#define XIVE2_VP_INT_PRIO           0x00000030
 
 typedef struct Xive2RouterClass {
     SysBusDeviceClass parent;